WO2017016342A1 - 一种多用户信息传输的调制方法、解调方法及装置 - Google Patents

一种多用户信息传输的调制方法、解调方法及装置 Download PDF

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WO2017016342A1
WO2017016342A1 PCT/CN2016/086449 CN2016086449W WO2017016342A1 WO 2017016342 A1 WO2017016342 A1 WO 2017016342A1 CN 2016086449 W CN2016086449 W CN 2016086449W WO 2017016342 A1 WO2017016342 A1 WO 2017016342A1
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modulation symbol
information bit
transmitter
modulation
symbol
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English (en)
French (fr)
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袁志锋
戴建强
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ZTE Corp
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ZTE Corp
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Priority to US15/744,925 priority Critical patent/US10404504B2/en
Priority to EP16829709.1A priority patent/EP3316538A4/en
Priority to JP2018504865A priority patent/JP6814198B2/ja
Priority to KR1020187003264A priority patent/KR20180025936A/ko
Publication of WO2017016342A1 publication Critical patent/WO2017016342A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7107—Subtractive interference cancellation
    • H04B1/71072—Successive interference cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03305—Joint sequence estimation and interference removal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3488—Multiresolution systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers
    • H04L27/3836—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers in which the carrier is recovered using the received modulated signal or the received IF signal, e.g. by detecting a pilot or by frequency multiplication

Definitions

  • the present application relates to, but is not limited to, a wireless communication technology, and more particularly to a modulation method, a demodulation method and a device for multi-user information transmission.
  • Multi-user information multiplexing can be implemented by orthogonal multiplexing or non-orthogonal multiplexing.
  • the non-orthogonal multiplexing mode means that information of multiple users can be transmitted on the same time-frequency resource.
  • the non-orthogonal multiplexing method employs superimposition coding technology in the transmitter, and adopts Serial Interference Cancellation (SIC) technology in the receiver.
  • SIC Serial Interference Cancellation
  • the transmitter separately encodes and modulates the bit stream of the user 1 and the bit stream of the user 2 to obtain the modulation symbol of the user 1 and the modulation symbol of the user 2, and superimposes the modulation symbols of the two users. Together, then send on the same time-frequency resource.
  • the process of superimposing the modulation symbols of these two users is also called "superimposition coding".
  • the SIC refers to demodulating the interference signal first. For example, when the user 2 is solved, the signal of the user 1 is called an interference signal, and then the received signal of the user 2 is subtracted from the decoded interference signal, and then the signal of the user 2 is demodulated.
  • Hierarchical modulation can be regarded as a variant of superposition coding. It refers to the combination of a high-priority bit stream and a low-priority bit stream, and then uniformly mapped onto the constellation map, which can be obtained with Gray (with Gray) mapping attributes.
  • the constellation, Gray means that the combined bit maps to the adjacent constellation points of the constellation diagram differing by only one bit.
  • Hierarchical modulation combined with SIC can achieve performance close to the capacity world, but layered modulation is not flexible for different power distribution of different data streams. To achieve downlink multi-user channel capacity, the implementation complexity is high.
  • This paper provides a modulation method, demodulation method and device for multi-terminal information transmission, which are used to solve the problem of non-orthogonal multiplexing of multi-user information.
  • a modulation method for multi-user information transmission comprising:
  • the transmitter superimposes the first modulation symbol and the second modulation symbol to obtain an overlay symbol.
  • the transmitter determines, according to the first information bit, the second information bit, and the mapping table, the first modulation symbol and the second modulation symbol, including:
  • the transmitter obtains the second modulation symbol by passing the second information bit through a second mapping relationship of the mapping table.
  • the first mapping relationship corresponds to multiple the second mapping relationships.
  • the transmitter obtains the first modulation symbol by using the first information bit to pass the first mapping relationship of the mapping table, including:
  • the transmitter obtains the first modulation symbol by using the first two-phase phase shift keying BPSK;
  • the transmitter obtains the first modulation symbol by passing the first information bit through a first four-phase phase shift keying QPSK.
  • the transmitter obtains the second modulation symbol by using the second information bit of the mapping table to obtain the second modulation symbol, including:
  • the transmitter passes the second information bit through a second QPSK mapping relationship to obtain the second modulation symbol, where the second QPSK mapping relationship is: According to the value of the first information bit, the real part of the modulation symbol mapped by the first QPSK is inverted, or the imaginary part of the modulation symbol mapped by the first QPSK is inverted, or the first QPSK mapping, or the modulation symbol mapped by the first QPSK Both the real part and the imaginary part are reversed;
  • the transmitter passes the second information bit through a second 16 orthogonal amplitude modulation 16QAM mapping relationship to obtain the second modulation symbol, where the second 16QAM mapping relationship is : according to the value of the first information bit, the real part of the modulation symbol mapped by 16QAM is inverted, or the imaginary part of the modulation symbol mapped by 16QAM is inverted, or 16QAM mapping, or the real part and the imaginary part of the modulation symbol mapped by 16QAM are taken anti;
  • the transmitter obtains the second modulation symbol by using a second 64-bit orthogonal amplitude modulation 64QAM mapping relationship, and the second 64QAM mapping relationship is : according to the value of the first information bit, the real part of the modulation symbol mapped by 64QAM is inverted, or the imaginary part of the modulation symbol mapped by 64QAM is inverted, or 64QAM mapping, or the real part and the imaginary part of the modulation symbol mapped by 64QAM are taken anti.
  • the transmitter superimposes the first modulation symbol and the second modulation symbol to obtain an overlay symbol, including:
  • the transmitter linearly superimposes the first modulation symbol and the second modulation symbol to obtain an overlay symbol.
  • the transmitter linearly superimposes the first modulation symbol and the second modulation symbol to obtain an overlay symbol, including:
  • the first power factor is a square root of a power ratio of the first information bit
  • the second power factor The square root of the power ratio of the second information bit
  • the power ratio of the first information bit plus the power ratio of the second information bit is equal to 1;
  • the transmitter adds the first weighted modulation symbol and the second weighted modulation symbol to obtain the superimposed symbol.
  • the transmitter determines, according to the first information bit, the second information bit, and a mapping table.
  • the method further includes:
  • the transmitter encodes the first bitstream to obtain a first information bit
  • the transmitter encodes the second bit stream to obtain a second information bit.
  • the transmitter superimposes the first modulation symbol and the second modulation symbol to obtain an overlay symbol, and further includes:
  • the transmitter will form the superposed symbol into a transmit signal and transmit the transmit signal to a plurality of receivers.
  • a method for demodulating multi-user information transmission comprising:
  • the receiver acquires a transmission signal sent by the transmitter
  • mapping table Determining, by the receiver, information sent by the transmitter to itself according to the transmit signal and a mapping table, the mapping table being configured to determine the first information bit and the first modulation symbol, and the second Corresponding relationship between the information bits and the second modulation symbol; each set of modulation symbols in the mapping table is superimposed and mapped to a constellation map having a Gray attribute.
  • the determining, according to the transmitting signal and the mapping table, the information that the transmitter sends to the transmitter includes:
  • the receiver is a first receiver, and obtains a first modulation symbol according to the transmission signal by a maximum likelihood method or a minimum mean square error method, and demodulates the first modulation symbol according to the mapping table to obtain a first Information bits, which decode the first information bits to obtain information transmitted by the transmitter to itself.
  • the determining, according to the transmitting signal and the mapping table, the information that the transmitter sends to the transmitter includes:
  • the receiver is a second receiver, and obtains a first modulation symbol according to the transmission signal by a maximum likelihood method or a minimum mean square error method, and removes the first modulation symbol by serial interference cancellation, by a maximum likelihood method or
  • the least mean square error method solves the second modulation symbol, demodulates the second modulation symbol according to the mapping table to obtain the second information bit, and decodes the second information bit to obtain the information sent by the transmitter to itself.
  • a transmitter comprising:
  • a first determining module configured to: according to the first information bit, the second information bit, and a mapping table, Determining a first modulation symbol and a second modulation symbol, the mapping table being configured to determine a correspondence between the first information bit and the first modulation symbol, and the second information bit and the second modulation symbol;
  • Each set of modulation symbols in the mapping table is superimposed and mapped to a constellation diagram having a Gray attribute;
  • a superimposing module configured to: superimpose the first modulation symbol and the second modulation symbol to obtain an overlay symbol.
  • the first determining module is configured to: pass the first information bit by using a first mapping relationship of the mapping table to obtain the first modulation symbol; and pass the second information bit by using the Mapping the second mapping relationship of the table to obtain the second modulation symbol.
  • the first mapping relationship corresponds to multiple the second mapping relationships.
  • the determining module is configured to: obtain the first modulation symbol by using the first information bit to pass any one of a first BPSK, or a first QPSK, or a first QAM.
  • the first determining module is configured to:
  • the first information bit is 1 bit
  • the first information bit is obtained by the first binary phase shift keying BPSK to obtain the first modulation symbol
  • the first information bit is 2 bits
  • the first information bit is obtained by using a first four-phase phase shift keying QPSK to obtain the first modulation symbol
  • the second information bit is 2 bits
  • the second information bit is obtained by the second QPSK mapping relationship
  • the second QPSK mapping relationship is: according to the value of the first information bit,
  • the real part of the modulation symbol mapped by the first QPSK is inverted, or the imaginary part of the modulation symbol mapped by the first QPSK is inverted, or the first QPSK mapping, or the real and imaginary parts of the modulation symbol mapped by the first QPSK are inverted.
  • the second information bit is 4 bits
  • the second information bit is obtained by the second 16-bit orthogonal amplitude modulation 16QAM mapping relationship to obtain the second modulation symbol
  • the second 16QAM mapping relationship is: according to the first
  • the value of the information bit is inverted by the real part of the modulation symbol mapped by 16QAM, or inverted by the imaginary part of the modulation symbol mapped by 16QAM, or 16QAM mapping, or the real part and the imaginary part of the modulation symbol mapped by 16QAM are inverted;
  • the second information bit is 6 bits
  • the second information bit is passed through a second 64 orthogonal amplitude modulation 64QAM mapping relationship to obtain the second modulation symbol, and the second 64QAM mapping is performed.
  • the relationship is: according to the value of the first information bit, the real part of the modulation symbol mapped by 64QAM is inverted, or the imaginary part of the modulation symbol mapped by 64QAM is inverted, or 64QAM mapping, or the real and imaginary parts of the modulation symbol mapped by 64QAM Both are reversed.
  • the superposition module is configured to perform linear superposition of the first modulation symbol and the second modulation symbol to obtain an overlay symbol.
  • the superposition module is configured to: multiply the first modulation symbol by a first power factor to obtain a first weighted modulation symbol; and multiply the second modulation symbol by a second power factor to obtain a second weighted modulation symbol; wherein the first power factor is a square root of a power ratio of the first information bit, the second power factor is a square root of a power ratio of the second information bit; a power of the first information bit The ratio of power to the second information bit is equal to 1; the first weighted modulation symbol and the second weighted modulation symbol are added to obtain the superimposed symbol.
  • the transmitter further includes an encoding module, where the encoding module is configured to: encode the first bit stream to obtain a first information bit; and encode the second bit stream to obtain a second information bit.
  • the transmitter further includes a sending module, where the sending module is configured to: form the superposed symbol into a transmit signal, and send the transmit signal to multiple receivers.
  • a receiver comprising:
  • Obtaining a module configured to: obtain a transmit signal sent by the transmitter;
  • a second determining module configured to: determine, according to the transmit signal and a mapping table, information sent by the transmitter to itself, where the mapping table is used to determine the first information bit and the first modulation symbol, and Corresponding relationship between the second information bit and the second modulation symbol; each set of modulation symbols in the mapping table is superimposed, and mapped to a constellation map having a Gray attribute.
  • the receiver is a first receiver
  • the second determining module is configured to: obtain, by using a maximum likelihood method or a minimum mean square error method, a first modulation symbol according to the transmit signal, where The first modulation symbol is demodulated according to the mapping table to obtain a first information bit, and the first information bit is decoded to obtain information sent by the transmitter to itself.
  • the first receiver is an edge user receiver.
  • the receiver is a second receiver
  • the second determining module is configured to: pass a maximum likelihood method or a minimum mean square error method, obtaining a first modulation symbol according to the transmitted signal, removing the first modulation symbol by serial interference cancellation, and solving the second modulation symbol by a maximum likelihood method or a minimum mean square error method And demodulating the second modulation symbol according to a mapping table to obtain a second information bit, and decoding the second information bit to obtain information sent by the transmitter to itself.
  • the second receiver is a central user receiver.
  • a computer readable storage medium storing computer executable instructions that, when executed by a processor, implement the above method.
  • the modulation method for multi-user information transmission includes: the transmitter determines, according to the first information bit, the second information bit, and the mapping table, the first modulation symbol and the second modulation symbol, where the mapping The table is configured to determine a correspondence between the first information bit and the first modulation symbol, and the second information bit and the second modulation symbol; each set of modulation symbols in the mapping table is superimposed and mapped to There is a Gray attribute on the constellation; the transmitter superimposes the first modulation symbol and the second modulation symbol to obtain an overlay symbol.
  • the modulation symbols are obtained according to the information bits and the mapping table, thereby simplifying the modulation process, thereby improving the non-orthogonal multiplexing efficiency of the multi-user information.
  • FIG. 1 is a schematic flowchart of an embodiment of a method for modulating multi-user information transmission according to the present invention
  • FIG. 2 is a schematic diagram of a applicable scenario of multi-user information transmission according to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of an embodiment of a method for demodulating multi-user information transmission according to the present invention
  • FIG. 4 is a schematic flowchart diagram of a second embodiment of a method for modulating multi-user information transmission according to the present invention.
  • FIG. 5 is a schematic diagram of mapping superimposed symbols to a constellation diagram according to an embodiment of the present invention.
  • FIG. 6 is a schematic flowchart diagram of a third embodiment of a modulation method for multi-user information transmission according to the present invention.
  • FIG. 7 is a schematic diagram of mapping superimposed symbols to constellation diagrams according to a second embodiment of the present invention.
  • FIG. 8 is a schematic flowchart diagram of a fourth embodiment of a modulation method for multi-user information transmission according to the present invention.
  • FIG. 9 is a schematic diagram of mapping superimposed symbols to constellation diagrams according to three embodiments of the present invention.
  • FIG. 10 is a schematic flow chart of an embodiment of a transmitter according to the present invention.
  • FIG. 11 is a schematic flow chart of a second embodiment of a transmitter according to the present invention.
  • FIG. 12 is a schematic flow chart of an embodiment of a receiver according to the present invention.
  • FIG. 1 is a schematic flowchart of a method for modulating multi-user information transmission according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a suitable scenario for transmitting multi-user information according to an embodiment of the present invention.
  • the frequency resource transmits user information to two user equipments, namely, the first terminal UE1 and the second terminal UE2.
  • Each user equipment can separate and demodulate the information of the user from the mixed signal.
  • the terminal farther from the transmitter is the first terminal UE1, that is, the edge user, and the terminal closer to the transmitter is the first
  • the second terminal UE2 is the central user.
  • a modulation method for multi-user information transmission provided by an embodiment of the present invention includes:
  • Step 101 The transmitter determines the first modulation symbol and the second modulation symbol according to the first information bit, the second information bit, and the mapping table.
  • the mapping table is configured to determine a correspondence between the first information bit and the first modulation symbol, and the second information bit and the second modulation symbol; in the mapping table Each set of modulation symbols is superimposed and mapped to a constellation diagram with a Gray property.
  • the mapping table may include multiple sets of information bits and corresponding sets of modulation symbols, and each set of modulation symbols may include two modulation symbols (corresponding to the first modulation symbol and the second modulation symbol).
  • a second mapping relationship the first information bit obtains the first modulation symbol by using a first mapping relationship of the mapping table, and the second information bit obtains the first information by using a second mapping relationship of the mapping table Two modulation symbols.
  • the first mapping relationship may correspond to a plurality of the second mapping relationships.
  • the first mapping relationship is a mapping table partial mapping relationship
  • the second mapping relationship is a mapping table partial mapping. relationship.
  • the mapping table when the first information bit is mapped in a manner to obtain the first modulation symbol, the second information bit may be mapped in multiple manners to obtain the second modulation symbol.
  • the transmitter obtains the first modulation symbol by using a first binary phase shift keying (BPSK).
  • BPSK binary phase shift keying
  • the transmitter obtains the first modulation symbol by using a first quadrature phase shift keying (QPSK).
  • QPSK quadrature phase shift keying
  • the transmitter passes the second information bit through a second QPSK mapping relationship to obtain the second modulation symbol, where the second QPSK mapping relationship is:
  • the value of the first information bit is inverted by the real part of the modulation symbol mapped by the first QPSK, or inverted by the imaginary part of the modulation symbol mapped by the first QPSK, or the first QPSK mapping, or the modulation symbol mapped by the first QPSK Both the ministry and the imaginary part are reversed;
  • the transmitter passes the second information bit through a second 16 orthogonal amplitude modulation 16QAM mapping relationship to obtain the second modulation symbol, where the second 16QAM mapping relationship is : according to the value of the first information bit, the real part of the modulation symbol mapped by 16QAM is inverted, or the imaginary part of the modulation symbol mapped by 16QAM is inverted, or 16QAM mapping, or the real part and the imaginary part of the modulation symbol mapped by 16QAM are taken anti;
  • the transmitter obtains the second modulation symbol by using a second 64-bit orthogonal amplitude modulation 64QAM mapping relationship, and the second 64QAM mapping relationship is : according to the value of the first information bit, the real part of the modulation symbol mapped by 64QAM is inverted, or the imaginary part of the modulation symbol mapped by 64QAM is inverted, or 64QAM mapping, or the real part and the imaginary part of the modulation symbol mapped by 64QAM are taken anti.
  • Step 102 The transmitter superimposes the first modulation symbol and the second modulation symbol to obtain a superimposed symbol.
  • one first modulation symbol and one second modulation symbol are superimposed to obtain one superimposed symbol, which is mapped to one constellation point on the constellation, all possible first modulation symbols and all possible second symbols.
  • Modulation symbol superposition get all possible superimposed symbols, map to the constellation for all A possible constellation point, this constellation has a Gray property.
  • the first modulation symbol and the second modulation symbol are linearly superimposed to obtain superimposed symbols.
  • the first power factor is the square root of the power ratio of the first information bit
  • the second power factor is the square root of the power ratio of the second information bit
  • the power ratio of the first information bit plus the second information bit The power ratio is equal to 1; the first weighted modulation symbol and the second weighted modulation symbol are added to obtain the superimposed symbol.
  • the transmitter determines the first modulation symbol and the second modulation symbol according to the first information bit, the second information bit, and the mapping table, where the mapping table is used to determine the first information bit and the first a modulation symbol, and a correspondence between the second information bit and the second modulation symbol; each set of modulation symbols in the mapping table is superimposed and mapped to a constellation having a Gray attribute; the transmitter will The first modulation symbol and the second modulation symbol are superimposed to obtain a superimposed symbol.
  • mapping the table mapping to obtain the modulation symbols, and then the modulation symbols are directly superimposed, the mapping from the two sets of information bits to the constellation with the Gray attribute is realized, thereby simplifying the non-orthogonal multiplexing of the multi-user information.
  • the method may further include:
  • the transmitter encodes the first bit stream to obtain a first information bit; the transmitter encodes the second bit stream to obtain a second information bit.
  • the transmitter can obtain the bit information stream according to the channel condition between itself and each receiver, that is, the channel between each terminal, according to the coding manner of the matching channel.
  • FIG. 3 is a schematic flowchart diagram of an embodiment of a method for demodulating multi-user information transmission according to the present invention. As shown in FIG. 3, the demodulation method for the multi-user information transmission includes:
  • Step 301 The receiver acquires a transmit signal sent by the transmitter.
  • the transmitting signal includes a superimposed symbol obtained by superimposing the first modulation symbol and the second modulation symbol by a transmitter, where the first modulation symbol and the second modulation symbol are according to the first information.
  • the bits, the second information bits, and the modulation symbols determined by the mapping table.
  • Step 302 The receiver determines, according to the transmit signal and a mapping table, information sent by the transmitter to itself.
  • the mapping table is configured to determine a correspondence between the first information bit and the first modulation symbol, and the second information bit and the second modulation symbol;
  • the group modulation symbols are superimposed and mapped to the constellation diagram with the Gray property.
  • the receiver acquires a transmit signal sent by the transmitter; the receiver determines information sent by the transmitter to itself according to the transmit signal and a mapping table, where the mapping table is used to determine the An information bit and the first modulation symbol, and a correspondence between the second information bit and the second modulation symbol; each set of modulation symbols in the mapping table is superimposed and mapped to a constellation having a Gray attribute.
  • User information is obtained by transmitting signals and mapping tables, thereby simplifying the demodulation process, thereby improving the non-orthogonal multiplexing efficiency of multi-user information.
  • step 302 may include:
  • the receiver is a first receiver, and obtains a first modulation symbol according to the transmission signal by a maximum likelihood method or a minimum mean square error method, and demodulates the first modulation symbol according to the mapping table to obtain a first Information bits, which decode the first information bits to obtain information transmitted by the transmitter to itself.
  • the first receiver is typically an edge user receiver.
  • the receiver is a second receiver, and obtains a first modulation symbol according to the transmission signal by a maximum likelihood method or a minimum mean square error method, and removes the first modulation symbol by serial interference cancellation, by a maximum likelihood method or
  • the least mean square error method solves the second modulation symbol, demodulates the second modulation symbol according to the mapping table to obtain the second information bit, and decodes the second information bit to obtain the information sent by the transmitter to itself.
  • the second receiver is typically a central user receiver.
  • FIG. 4 is a schematic flowchart diagram of a second embodiment of a method for modulating multi-user information transmission according to the present invention.
  • FIG. 5 is a schematic diagram of mapping superimposed symbols to constellation diagrams according to an embodiment of the invention.
  • the modulation method of the multi-user information transmission includes:
  • Step 401 The transmitter acquires the first information bit and the second information bit.
  • the transmitter can obtain the bit information stream according to the channel condition between itself and each receiver, that is, the channel between each terminal, according to the coding mode of the matching channel.
  • Step 402 The transmitter maps the first information bit according to the first QPSK of the mapping table to obtain the first modulation symbol.
  • Step 403 The transmitter maps the second information bit according to the second QPSK of the mapping table to obtain the second modulation symbol.
  • mapping table used is shown in Table 1:
  • Each row of the mapping table in Table 1 above includes two sets of information bits and two modulation symbols corresponding to the two sets of information bits, the two modulation symbols forming a set of modulation symbols.
  • Each set of modulation symbols in the mapping table is superimposed and mapped to the constellation diagram with a Gray property.
  • Step 404 The transmitter superimposes the first modulation symbol and the second modulation symbol to obtain an overlay symbol.
  • the first modulation symbol X1 and the second modulation symbol X2 are linearly superimposed, that is, the first modulation symbol X1 and the second modulation symbol X2 are multiplied by the power factors a1 and a2 respectively, and then superposed to obtain X, which is expressed as X1 ⁇ a1+X2 ⁇ a2.
  • One first modulation symbol and one second modulation symbol are superimposed to obtain one superimposed symbol, which is mapped to one constellation point on the constellation diagram.
  • the superimposed symbol X is mapped onto the time-frequency resource and sent to the receiver.
  • the receiver UE receives the transmission signal from the transmitter, wherein the transmission signal is obtained by the first embodiment.
  • the receiver demodulates the information according to the mapping table, as shown in FIG.
  • the passing wireless channel is an AWGN channel
  • the transmitted signal is only interfered by additive white noise
  • the data symbols or superimposed symbols are subject to noise interference, which is represented on the constellation diagram, and the received symbols are offset from the superimposed constellation points by a certain Euclidean distance. At some point.
  • the user's information can be directly demodulated with interference and noise interference from the central user information.
  • the first modulation symbol is obtained, for example, by a Maximum Likelihood (ML) method or a minimum mean square error method. Then, the first modulation symbol is mapped and demodulated according to Table 1 to obtain a first information bit, and the first information bit is decoded to obtain edge user information.
  • ML Maximum Likelihood
  • the first modulation symbol is demodulated by the maximum likelihood method or the minimum mean square error method
  • the first modulation symbol is removed by the SIC, and then the maximum likelihood method or the minimum is adopted.
  • the mean square error method solves the second modulation symbol, and then demodulates the second modulation symbol according to Table 1 to obtain a second information bit, and decodes the second information bit to obtain user information.
  • the modulation symbols are obtained by mapping table mapping, and then the modulation symbols are directly superimposed, thereby realizing the mapping from two sets of information bits to the constellation having the Gray attribute, thereby simplifying the non-orthogonal multiplexing of the multi-user information.
  • FIG. 6 is a schematic flowchart diagram of a third embodiment of a modulation method for multi-user information transmission according to the present invention.
  • FIG. 7 is a schematic diagram of mapping superimposed symbols to constellation diagrams according to a second embodiment of the present invention.
  • the modulation method of the multi-user information transmission includes:
  • Step 601 The transmitter acquires the first information bit and the second information bit.
  • the transmitter can obtain the bit information stream according to the channel condition between itself and each receiver, that is, the channel between each terminal, according to the coding manner of the matching channel.
  • Step 602 The transmitter maps the first information bit according to the first QPSK of the mapping table to obtain the first modulation symbol.
  • Step 603 The transmitter maps the second information bit according to the second 16QAM of the mapping table to obtain the second modulation symbol.
  • mapping table used is shown in Table 2:
  • Step 604 The transmitter superimposes the first modulation symbol and the second modulation symbol to obtain an overlay symbol.
  • the first modulation symbol X1 and the second modulation symbol X2 are linearly superimposed, that is, the first modulation symbol X1 and the second modulation symbol X2 are multiplied by the power factors a1 and a2 respectively, and then superposed to obtain X, which is represented as X1 ⁇ a1+X2. ⁇ a2. 1 first modulation symbol and 1 second modulation symbol are superimposed to obtain 1 superimposed symbol, which is mapped to a constellation point on the constellation diagram. According to Table 2, the first modulation symbol and the second modulation symbol are superimposed.
  • FIG. 8 is a schematic flowchart diagram of a fourth embodiment of a modulation method for multi-user information transmission according to the present invention.
  • FIG. 9 is a schematic diagram of mapping superimposed symbols to constellation diagrams according to a third embodiment of the present invention.
  • the modulation method of the multi-user information transmission includes:
  • Step 801 The transmitter acquires the first information bit and the second information bit.
  • the transmitter can obtain the bit information stream according to the channel condition between itself and each receiver, that is, the channel between each terminal, according to the coding manner of the matching channel.
  • Step 802 The transmitter maps the first information bit according to the first BPSK of the mapping table. The first modulation symbol.
  • Step 803 The transmitter maps the second information bit according to the second 16QAM of the mapping table to obtain the second modulation symbol.
  • mapping table used is shown in Table 3:
  • Step 604 The transmitter superimposes the first modulation symbol and the second modulation symbol to obtain an overlay symbol.
  • first modulation symbol X1 and the second modulation symbol X2 are linearly superimposed, that is, the first modulation symbol X1 and the second modulation symbol X2 are multiplied by the power factors a1 and a2, respectively, and obtained X, which is represented as X1 ⁇ a1+X2 ⁇ a2.
  • One first modulation symbol and one second modulation symbol are superimposed to obtain one.
  • the superimposed symbols are mapped to one constellation point on the constellation diagram. According to Table 3, there are a total of 32 possible cases in which the first modulation symbol and the second modulation symbol are superimposed, and all possible superimposed symbols are mapped to the constellation diagram with a Gray attribute.
  • the modulation symbols are obtained by mapping table mapping, and then the modulation symbols are directly superimposed, thereby realizing the mapping from two sets of information bits to the constellation having the Gray attribute, thereby simplifying the non-orthogonal multiplexing of the multi-user information.
  • the transmitter when the first information bit is 1 bit, the transmitter obtains the first modulation symbol by using the first information bit by using the first BPSK; when the first information bit is 2 bits, the transmitting The machine passes the first information bit through the first QPSK to obtain the first modulation symbol.
  • the transmitter passes the second information bit through a second QPSK mapping relationship to obtain the second modulation symbol, where the second QPSK mapping relationship is: according to the first information bit.
  • the real part of the modulation symbol mapped by the first QPSK is inverted, or the imaginary part of the modulation symbol mapped by the first QPSK is inverted, or the first QPSK mapping, or the real and imaginary parts of the modulation symbol mapped by the first QPSK Negate;
  • the transmitter obtains the second modulation symbol by using the second 16-bit orthogonal amplitude modulation 16QAM mapping relationship, and the second 16QAM mapping relationship is:
  • the value of the first information bit is inverted by the real part of the modulation symbol mapped by 16QAM, or inverted by the imaginary part of the modulation symbol mapped by 16QAM, or 16QAM mapping, or the real part and the imaginary part of the modulation symbol mapped by 16QAM are inverted;
  • the transmitter obtains the second modulation symbol by using a second 64-bit orthogonal amplitude modulation 64QAM mapping relationship, and the second 64QAM mapping relationship is:
  • the value of the first information bit is inverted by the real part of the modulation symbol mapped by 64QAM, or inverted by the imaginary part of the modulation symbol mapped by 64QAM, or 64QAM mapping, or the real part and the imaginary part of the modulation symbol mapped by 64QAM are inverted.
  • the first modulation symbol is a modulation symbol obtained by LTE modulation of the first information bit.
  • the second modulation symbol is that after the second information bit is modulated by LTE, the real part and/or the imaginary part are inversed according to the value of the first information bit, or the real part and the imaginary part remain unchanged, thereby obtaining Modulation symbol.
  • the real and/or imaginary part of the modulated symbol is inverted, or the rule that the real part and the imaginary part remain unchanged may be set by the transmitting side and/or the receiving side.
  • x 0 is the modulation symbol obtained by LTE modulation of b(0)b(1)
  • x 1 is the modulation symbol obtained by LTE modulation
  • b is 0 (0) b (1)...b(n)
  • n is 1 or 3 Or 5.
  • f(x 0 , x 1 ) is a fixed function with x 0 and x 1 as the dependent variable, where the absolute and imaginary parts of f(x 0 , x 1 ) have the same absolute value as x 1 , but the real part and The sign of the imaginary part may be different from x 1 .
  • Each row of the above mapping table includes two sets of information bits (b(0)b(1), b(0)b(1)...b(n)), and two modulation symbols corresponding to the two sets of information bits. (x 0 ,, f(x 0 , x 1 )), the two modulation symbols form a set of modulation symbols. Each set of modulation symbols (x 0 ,, f(x 0 , x 1 )) in the mapping table is superimposed and mapped to the constellation diagram with a Gray property.
  • FIG. 10 is a schematic flow chart of an embodiment of a transmitter according to the present invention. As shown in FIG. 10, the transmitter includes: a first determining module 101 and a superimposing module 102, where
  • the first determining module 101 is configured to: determine, according to the first information bit, the second information bit, and the mapping table, the first modulation symbol and the second modulation symbol, where the mapping table is used to determine the first information bit and the a first modulation symbol, and a correspondence between the second information bit and the second modulation symbol; each set of modulation symbols in the mapping table is superimposed, and mapped to a constellation map having a Gray attribute;
  • the superposition module 101 is configured to superimpose the first modulation symbol and the second modulation symbol to obtain an overlay symbol.
  • the transmitter determines the first modulation symbol and the second modulation symbol according to the first information bit, the second information bit, and the mapping table, where the mapping table is used to determine the first information bit and the first a modulation symbol, and a correspondence between the second information bit and the second modulation symbol; each set of modulation symbols in the mapping table is superimposed and mapped to a constellation having a Gray attribute; the transmitter will The first modulation symbol and the second modulation symbol are superimposed to obtain a superimposed symbol.
  • the modulation symbols are obtained by mapping the table mapping, and then the modulation symbols are superimposed directly, and the two groups are realized.
  • Information bits are mapped to constellations with Gray attributes, simplifying non-orthogonal multiplexing of multi-user information.
  • the first determining module 101 is configured to: pass the first information bit through a first mapping relationship of the mapping table to obtain the first modulation symbol; and set the second information bit Obtaining the second modulation symbol by using a second mapping relationship of the mapping table.
  • the first mapping relationship corresponds to a plurality of the second mapping relationships.
  • the first determining module 101 is configured to:
  • the first information bit is 1 bit
  • the first information bit is obtained by the first binary phase shift keying BPSK to obtain the first modulation symbol
  • the first information bit is 2 bits
  • the first information bit is obtained by the first quadrature phase shift keying QPSK to obtain the first modulation symbol.
  • the first determining module 101 is configured to:
  • the second information bit is 2 bits
  • the second information bit is obtained by the second QPSK mapping relationship
  • the second QPSK mapping relationship is: according to the value of the first information bit,
  • the real part of the modulation symbol mapped by the first QPSK is inverted, or the imaginary part of the modulation symbol mapped by the first QPSK is inverted, or the first QPSK mapping, or the real and imaginary parts of the modulation symbol mapped by the first QPSK are inverted.
  • the second information bit is 4 bits
  • the second information bit is obtained by the second 16-bit orthogonal amplitude modulation 16QAM mapping relationship to obtain the second modulation symbol
  • the second 16QAM mapping relationship is: according to the first
  • the value of the information bit is inverted by the real part of the modulation symbol mapped by 16QAM, or inverted by the imaginary part of the modulation symbol mapped by 16QAM, or 16QAM mapping, or the real part and the imaginary part of the modulation symbol mapped by 16QAM are inverted;
  • the second information bit is 6 bits
  • the second information bit is obtained by the second 64-bit orthogonal amplitude modulation 64QAM mapping relationship to obtain the second modulation symbol
  • the second 64QAM mapping relationship is: according to the first
  • the value of the information bit is inverted by the real part of the modulation symbol mapped by 64QAM, or inverted by the imaginary part of the modulation symbol mapped by 64QAM, or 64QAM mapping, or the real part and the imaginary part of the modulation symbol mapped by 64QAM are inverted.
  • the superposition module 102 is configured to perform linear superposition of the first modulation symbol and the second modulation symbol to obtain an overlay symbol.
  • the superposition module 102 is configured to: multiply the first modulation symbol by a first power factor to obtain a first weighted modulation symbol; and the second modulation symbol Multiplying the second power factor to obtain a second weighted modulation symbol; wherein the first power factor is a square root of a power ratio of the first information bit, and the second power factor is a power ratio of the second information bit a square root; a power ratio of the first information bit plus a power ratio of the second information bit is equal to 1; adding the first weighted modulation symbol and the second weighted modulation symbol to obtain the superimposed symbol.
  • FIG. 11 is a schematic flowchart diagram of a second embodiment of a transmitter according to the present invention.
  • the transmitter may further include an encoding module 103, where the encoding module 103 is configured to: encode the first bitstream to obtain a first information bit; and encode the second bitstream to obtain Second information bit.
  • the transmitter may further include: a sending module 104, where the sending module 104 is configured to: form the superposed symbol to form a transmit signal, and send the transmit signal to multiple receivers.
  • a sending module 104 configured to: form the superposed symbol to form a transmit signal, and send the transmit signal to multiple receivers.
  • FIG. 12 is a schematic flow chart of an embodiment of a receiver according to the present invention. As shown in FIG. 12, a receiver includes: an obtaining module 121 and a second determining module 122, where
  • the obtaining module 121 is configured to: acquire a transmit signal sent by the transmitter;
  • the second determining module 122 is configured to: determine, according to the transmit signal and a mapping table, information that is sent by the transmitter to the self, where the mapping table is used to determine the first information bit and the first modulation symbol, And a corresponding relationship between the second information bit and the second modulation symbol; each set of modulation symbols in the mapping table is superimposed, and mapped to a constellation map having a Gray attribute.
  • the receiver acquires a transmit signal sent by the transmitter; the receiver determines information sent by the transmitter to itself according to the transmit signal and a mapping table, where the mapping table is used to determine the An information bit and the first modulation symbol, and a correspondence between the second information bit and the second modulation symbol; each set of modulation symbols in the mapping table is superimposed and mapped to a constellation having a Gray attribute.
  • the user information is obtained according to the transmitted signal and the mapping table, thereby simplifying the demodulation process, thereby improving the non-orthogonal multiplexing efficiency of the multi-user information.
  • the receiver is a first receiver
  • the second determining module 122 is configured to obtain a first according to the transmitted signal by a maximum likelihood method or a minimum mean square error method. a modulation symbol, demodulating the first modulation symbol according to the mapping table to obtain a first information bit, and decoding the first information bit to obtain information sent by the transmitter to itself.
  • the first receiver is typically an edge user receiver.
  • the receiver is a second receiver
  • the second determining module 122 is configured to: obtain a first modulation according to the transmit signal by a maximum likelihood method or a minimum mean square error method. a symbol, removing the first modulation symbol by serial interference cancellation, solving the second modulation symbol by a maximum likelihood method or a minimum mean square error method, demodulating the second modulation symbol according to a mapping table to obtain a second information bit, and decoding
  • the second information bit is obtained by the transmitter to transmit information to itself.
  • the second receiver is typically a central user receiver.
  • the embodiment of the invention further provides a computer readable storage medium storing computer executable instructions, which are implemented by the processor to implement the modulation method of the multi-user information transmission.
  • the embodiment of the invention further provides a computer readable storage medium storing computer executable instructions, which are implemented by the processor to implement the demodulation method of the multi-user information transmission.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • the device/function module/functional unit in the above embodiment When the device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the modulation symbols are obtained by mapping table mapping, and then the modulation symbols are directly superimposed, thereby simplifying the modulation process, thereby improving the non-orthogonal multiplexing efficiency of the multi-user information.

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Abstract

本文公布一种多用户信息传输的调制方法、解调方法及装置。该调制方法，包括：发射机根据第一信息比特、第二信息比特和映射表，确定第一调制符号和第二调制符号，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性；所述发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号。

Description

一种多用户信息传输的调制方法、解调方法及装置 技术领域
本申请涉及但不限于无线通信技术，尤指一种多用户信息传输的调制方法、解调方法及装置。
背景技术
多用户信息复用可以通过正交复用方式或非正交复用方式实现，其中，非正交复用方式是指多个用户的信息可以在相同的时频资源上传输。
通常，非正交复用方式在发射机采用叠加编码技术，并在接收机采用串行干扰消除(Successive Interference Cancellation，SIC)技术。例如在一个下行传输系统中，发射机将用户1的比特流和用户2的比特流分别编码调制后，得到用户1的调制符号和用户2的调制符号，将这两个用户的调制符号叠加到一起，然后在相同时频资源上发送。这两个用户的调制符号叠加起来的过程又称为“叠加编码”。SIC指先解调出干扰信号，如解用户2时，用户1的信号称为干扰信号，然后将用户2的接收信号减去所述解出的干扰信号后，再解调用户2的信号。
分层调制(Hierarchical modulation)可以看做一种叠加编码的变种，指通过高优先比特流和低优先比特流的组合后，再统一映射到星座图上，可以得到具有格雷(同Gray)映射属性的星座，格雷指组合的比特映射到星座图的相邻星座点仅有1个比特不同。分层调制结合SIC可以达到接近容量界的性能，但分层调制对不同数据流做不同功率分配很不灵活，要达到下行多用户信道容量，实现复杂度高。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
在相关技术中，分层调制对不同数据流做不同功率分配较不灵活，导致 多用户信息的非正交复用比较复杂。
本文提供了一种多终端信息传输的调制方法、解调方法及装置，用以解决多用户信息的非正交复用比较复杂的问题。
一种多用户信息传输的调制方法，包括：
发射机根据第一信息比特、第二信息比特和映射表，确定第一调制符号和第二调制符号，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性；
所述发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号。
可选的，所述发射机根据第一信息比特、第二信息比特和映射表，确定第一调制符号和第二调制符号，包括：
所述发射机将所述第一信息比特通过所述映射表的第一映射关系，获得所述第一调制符号；
所述发射机将所述第二信息比特通过所述映射表的第二映射关系，获得所述第二调制符号。
可选的，所述第一映射关系对应多个所述第二映射关系。
可选的，所述发射机将所述第一信息比特通过所述映射表的第一映射关系，获得所述第一调制符号，包括：
所述第一信息比特为1比特时，所述发射机将所述第一信息比特通过第一二相相移键控BPSK获得所述第一调制符号；
所述第一信息比特为2比特时，所述发射机将所述第一信息比特通过第一四相相移键控QPSK，获得所述第一调制符号。
可选的，所述发射机将所述第二信息比特通过所述映射表的第二映射关系，获得所述第二调制符号，包括：
所述第二信息比特为2比特时，所述发射机将所述第二信息比特通过第二QPSK映射关系，获得所述第二调制符号，所述第二QPSK映射关系为： 根据第一信息比特的值，按第一QPSK映射的调制符号实部取反，或者按第一QPSK映射的调制符号虚部取反，或者第一QPSK映射，或者按第一QPSK映射的调制符号实部和虚部均取反；
所述第二信息比特为4比特时，所述发射机将所述第二信息比特通过第二16正交幅度调制16QAM映射关系，获得所述第二调制符号，所述第二16QAM映射关系为：根据第一信息比特的值，按16QAM映射的调制符号实部取反，或者按16QAM映射的调制符号虚部取反，或者16QAM映射，或者按16QAM映射的调制符号实部和虚部均取反；
所述第二信息比特为6比特时，所述发射机将所述第二信息比特通过第二64正交幅度调制64QAM映射关系，获得所述第二调制符号，所述第二64QAM映射关系为：根据第一信息比特的值，按64QAM映射的调制符号实部取反，或者按64QAM映射的调制符号虚部取反，或者64QAM映射，或者按64QAM映射的调制符号实部和虚部均取反。
可选的，所述发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号，包括：
所述发射机将所述第一调制符号和所述第二调制符号进行线性叠加，获得叠加符号。
可选的，所述发射机将所述第一调制符号和第二调制符号进行线性叠加，获得叠加符号，包括：
所述发射机将所述第一调制符号与第一功率因子相乘，获得第一加权调制符号；
所述发射机将所述第二调制符号与第二功率因子相乘，获得第二加权调制符号；所述第一功率因子为第一信息比特的功率占比的平方根，所述第二功率因子为第二信息比特的功率占比的平方根；第一信息比特的功率占比加上第二信息比特的功率占比等于1；
所述发射机将所述第一加权调制符号和所述第二加权调制符号相加，获得所述叠加符号。
可选的，所述发射机根据第一信息比特、第二信息比特和映射表，确定 第一调制符号和第二调制符号之前，还包括：
所述发射机将第一比特流进行编码，获得第一信息比特；
所述发射机将第二比特流进行编码，获得第二信息比特。
可选的，所述发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号之后，还包括：
所述发射机将将所述叠加符号形成发射信号，并将所述发射信号发送至多个接收机。
一种多用户信息传输的解调方法，包括：
接收机获取发射机发送的发射信号；
所述接收机根据所述发射信号和映射表，确定所述发射机发送给自身的信息，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性。
可选的，所述接收机根据所述发射信号和映射表，确定所述发射机发送给自身的信息包括：
所述接收机为第一接收机，通过最大似然法或最小均方误差法，根据所述发射信号得到第一调制符号，将所述第一调制符号按照所述映射表解调得到第一信息比特，解码第一信息比特得到所述发射机发送给自身的信息。
可选的，所述接收机根据所述发射信号和映射表，确定所述发射机发送给自身的信息包括：
所述接收机为第二接收机，通过最大似然法或最小均方误差法，根据所述发射信号得到第一调制符号，通过串行干扰消除去除第一调制符号，通过最大似然法或最小均方误差法解出第二调制符号，将所述第二调制符号按照映射表解调得到第二信息比特，解码第二信息比特得到所述发射机发送给自身的信息。
一种发射机，包括：
第一确定模块，设置为：根据第一信息比特、第二信息比特和映射表， 确定第一调制符号和第二调制符号，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性；
叠加模块，设置为：将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号。
可选的，所述第一确定模块，设置为：将所述第一信息比特通过所述映射表的第一映射关系，获得所述第一调制符号；将所述第二信息比特通过所述映射表的第二映射关系，获得所述第二调制符号。
可选的，所述第一映射关系对应多个所述第二映射关系。
可选的，所述确定模块，设置为：将所述第一信息比特通过第一BPSK，或第一QPSK，或第一QAM中的任意一种映射关系，获得所述第一调制符号。
可选的，所述第一确定模块，设置为：
所述第一信息比特为1比特时，将所述第一信息比特通过第一二相相移键控BPSK获得所述第一调制符号；
所述第一信息比特为2比特时，将所述第一信息比特通过第一四相相移键控QPSK，获得所述第一调制符号；
所述第二信息比特为2比特时，将所述第二信息比特通过第二QPSK映射关系，获得所述第二调制符号，所述第二QPSK映射关系为：根据第一信息比特的值，按第一QPSK映射的调制符号实部取反，或者按第一QPSK映射的调制符号虚部取反，或者第一QPSK映射，或者按第一QPSK映射的调制符号实部和虚部均取反；
所述第二信息比特为4比特时，将所述第二信息比特通过第二16正交幅度调制16QAM映射关系，获得所述第二调制符号，所述第二16QAM映射关系为：根据第一信息比特的值，按16QAM映射的调制符号实部取反，或者按16QAM映射的调制符号虚部取反，或者16QAM映射，或者按16QAM映射的调制符号实部和虚部均取反；
所述第二信息比特为6比特时，将所述第二信息比特通过第二64正交幅度调制64QAM映射关系，获得所述第二调制符号，所述第二64QAM映射 关系为：根据第一信息比特的值，按64QAM映射的调制符号实部取反，或者按64QAM映射的调制符号虚部取反，或者64QAM映射，或者按64QAM映射的调制符号实部和虚部均取反。
可选的，所述叠加模块，设置为：第一调制符号和第二调制符号进行线性叠加，获得叠加符号。
可选的，所述叠加模块，设置为：将所述第一调制符号与第一功率因子相乘，获得第一加权调制符号；将所述第二调制符号与第二功率因子相乘，获得第二加权调制符号；其中，所述第一功率因子为第一信息比特的功率占比的平方根，所述第二功率因子为第二信息比特的功率占比的平方根；第一信息比特的功率占比加上第二信息比特的功率占比等于1；将所述第一加权调制符号和所述第二加权调制符号相加，获得所述叠加符号。
可选的，所述发射机还包括编码模块，所述编码模块，设置为：将第一比特流进行编码，获得第一信息比特；将第二比特流进行编码，获得第二信息比特。
可选的，所述发射机还包括发送模块，所述发送模块，设置为：将所述叠加符号形成发射信号，并将所述发射信号发送至多个接收机。
一种接收机，包括：
获取模块，设置为：获取发射机发送的发射信号；
第二确定模块，设置为：根据所述发射信号和映射表，确定所述发射机发送给自身的信息，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性。
可选的，所述接收机为第一接收机，所述第二确定模块，设置为：通过最大似然法或最小均方误差法，根据所述发射信号得到第一调制符号，将所述第一调制符号按照所述映射表解调得到第一信息比特，解码第一信息比特得到所述发射机发送给自身的信息。
可选的，所述第一接收机为边缘用户接收机。
可选的，所述接收机为第二接收机，所述第二确定模块，设置为：通过 最大似然法或最小均方误差法，根据所述发射信号得到第一调制符号，通过串行干扰消除去除第一调制符号，通过最大似然法或最小均方误差法解出第二调制符号，将所述第二调制符号按照映射表解调得到第二信息比特，解码第二信息比特得到所述发射机发送给自身的信息。
可选的，所述第二接收机为中心用户接收机。
一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现上述方法。
与相关技术相比，本发明实施例多用户信息传输的调制方法，包括：发射机根据第一信息比特、第二信息比特和映射表，确定第一调制符号和第二调制符号，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性；所述发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号。实现了根据信息比特和映射表获得调制符号，从而简化了调制过程，进而提高了多用户信息的非正交复用效率。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1为本发明多用户信息传输的调制方法一实施例的流程示意图；
图2为本发明实施例多用户信息传输的适用场景示意图；
图3为本发明多用户信息传输的解调方法一实施例的流程示意图；
图4为本发明多用户信息传输的调制方法二实施例的流程示意图；
图5为本发明一实施例的叠加符号映射到星座图的示意图；
图6为本发明多用户信息传输的调制方法三实施例的流程示意图；
图7为本发明二实施例的叠加符号映射到星座图的示意图；
图8为本发明多用户信息传输的调制方法四实施例的流程示意图；
图9为本发明三实施例的叠加符号映射到星座图的示意图
图10为本发明发射机一实施例的流程示意图；
图11为本发明发射机二实施例的流程示意图；
图12为本发明接收机一实施例的流程示意图。
本发明的实施方式
下文中将结合附图对本发明的实施方式进行说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
图1为本发明多用户信息传输的调制方法一实施例的流程示意图，图2为本发明实施例多用户信息传输的适用场景示意图，如图2所示，发射机，例如基站BS在相同时频资源向两个用户设备，即第一终端UE1和第二终端UE2发送用户信息。每个用户设备可以从混合信号中分离解调出自身用户的信息，在本实施例中，距离发射机较远的终端为第一终端UE1，即边缘用户，距离发射机较近的终端为第二终端UE2，即中心用户。如图1所示，本发明实施例提供的多用户信息传输的调制方法，包括：
步骤101、发射机根据第一信息比特、第二信息比特和映射表，确定第一调制符号和第二调制符号。
在本实施例中，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性。
其中，所述映射表可包含多组信息比特和对应的多组调制符号，每组调制符号可包含两个调制符号(对应第一调制符号和第二调制符号)。映射表的每组信息比特与对应的调制符号之间存在映射关系，如，第一信息比特与第一调制符号之间存在第一映射关系，第二信息比特与第二调制符号之间存在第二映射关系，所述第一信息比特通过所述映射表的第一映射关系，获得所述第一调制符号；所述第二信息比特通过所述映射表的第二映射关系，获得所述第二调制符号。第一映射关系可以对应多个所述第二映射关系。
第一映射关系为映射表部分映射关系，第二映射关系为映射表部分映射 关系。在映射表中，当第一信息比特按照一个方式映射，获得所述第一调制符号时，第二信息比特可能按照多个方式映射，获得所述第二调制符号。
举例来讲，所述第一信息比特为1比特时，所述发射机将所述第一信息比特通过第一二相相移键控(Binary Phase Shift Keying，BPSK)获得所述第一调制符号；
所述第一信息比特为2比特时，所述发射机将所述第一信息比特通过第一四相相移键控(Quadri Phase Shift Keying，QPSK)，获得所述第一调制符号。
对应的，所述第二信息比特为2比特时，所述发射机将所述第二信息比特通过第二QPSK映射关系，获得所述第二调制符号，所述第二QPSK映射关系为：根据第一信息比特的值，按第一QPSK映射的调制符号实部取反，或者按第一QPSK映射的调制符号虚部取反，或者第一QPSK映射，或者按第一QPSK映射的调制符号实部和虚部均取反；
所述第二信息比特为4比特时，所述发射机将所述第二信息比特通过第二16正交幅度调制16QAM映射关系，获得所述第二调制符号，所述第二16QAM映射关系为：根据第一信息比特的值，按16QAM映射的调制符号实部取反，或者按16QAM映射的调制符号虚部取反，或者16QAM映射，或者按16QAM映射的调制符号实部和虚部均取反；
所述第二信息比特为6比特时，所述发射机将所述第二信息比特通过第二64正交幅度调制64QAM映射关系，获得所述第二调制符号，所述第二64QAM映射关系为：根据第一信息比特的值，按64QAM映射的调制符号实部取反，或者按64QAM映射的调制符号虚部取反，或者64QAM映射，或者按64QAM映射的调制符号实部和虚部均取反。
步骤102、发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号。
本实施例中，1个第一调制符号和1个第二调制符号叠加，得到1个叠加符号，映射到星座图上为1个星座点，所有可能的第一调制符号和所有可能的第二调制符号叠加，得到所有可能的叠加符号，映射到星座图上为所有 可能的星座点，这个星座图具有格雷属性。
举例来讲，第一调制符号和第二调制符号进行线性叠加，获得叠加符号。
可选的，将所述第一调制符号与第一功率因子相乘，获得第一加权调制符号；将所述第二调制符号与第二功率因子相乘，获得第二加权调制符号；其中，所述第一功率因子为第一信息比特的功率占比的平方根，所述第二功率因子为第二信息比特的功率占比的平方根；第一信息比特的功率占比加上第二信息比特的功率占比等于1；将所述第一加权调制符号和所述第二加权调制符号相加，获得所述叠加符号。
在本实施例中，发射机根据第一信息比特、第二信息比特和映射表，确定第一调制符号和第二调制符号，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性；所述发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号。通过映射表映射得到调制符号，然后调制符号直接叠加的方式，实现了从两组信息比特映射到有格雷属性的星座，从而简化了多用户信息的非正交复用。
在上述实施例的基础上，在发射机根据第一信息比特、第二信息比特和映射表，确定第一调制符号和第二调制符号之前，还可以包括：
发射机将第一比特流进行编码，获得第一信息比特；发射机将第二比特流进行编码，获得第二信息比特。
也就是说，发射机可以根据自身和每个接收机，即每个终端之间的信道情况，按匹配信道的编码方式，获得比特信息流。
图3为本发明多用户信息传输的解调方法一实施例的流程示意图。如图3所示，该多用户信息传输的解调方法，包括：
步骤301、接收机获取发射机发送的发射信号。
本实施例中，所述发射信号包括发射机将所述第一调制符号和所述第二调制符号进行叠加，获得的叠加符号，所述第一调制符号和第二调制符号为根据第一信息比特、第二信息比特和映射表确定的调制符号。
步骤302、接收机根据所述发射信号和映射表，确定所述发射机发送给自身的信息。
本实施例中，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性。
在本实施例中，接收机获取发射机发送的发射信号；所述接收机根据所述发射信号和映射表，确定所述发射机发送给自身的信息，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性。通过发射信号和映射表得到用户信息，从而简化了解调过程，进而提高了多用户信息的非正交复用效率。
在上述实施例的基础上，步骤302可包括：
所述接收机为第一接收机，通过最大似然法或最小均方误差法，根据所述发射信号得到第一调制符号，将所述第一调制符号按照所述映射表解调得到第一信息比特，解码第一信息比特得到所述发射机发送给自身的信息。
其中，所述第一接收机通常为边缘用户接收机。
所述接收机为第二接收机，通过最大似然法或最小均方误差法，根据所述发射信号得到第一调制符号，通过串行干扰消除去除第一调制符号，通过最大似然法或最小均方误差法解出第二调制符号，将所述第二调制符号按照映射表解调得到第二信息比特，解码第二信息比特得到所述发射机发送给自身的信息。
所述第二接收机通常为中心用户接收机。
图4为本发明多用户信息传输的调制方法二实施例的流程示意图。图5为本发明一实施例的叠加符号映射到星座图的示意图。如图4所示，该多用户信息传输的调制方法，包括：
步骤401、发射机获取第一信息比特和第二信息比特。
发射机可以根据自身和每个接收机，即每个终端之间的信道情况，按匹配信道的编码方式，获得比特信息流。
步骤402、发射机将第一信息比特按照映射表的第一QPSK映射，获得第一调制符号。
步骤403、发射机将第二信息比特按照映射表的第二QPSK映射，获得第二调制符号。
所采用的映射表如表1所示：
表1
Figure PCTCN2016086449-appb-000001
在上述表1中的映射表的每一行包括两组信息比特、以及所述两组信息比特对应的两个调制符号，该两个调制符号组成一组调制符号。映射表中每组调制符号相叠加，映射到星座图上具有格雷属性。
步骤404、发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号。
第一调制符号X1和第二调制符号X2线性叠加，即第一调制符号X1和第二调制符号X2，分别乘上功率因子a1和a2后叠加，得到X，表示为X1·a1+X2·a2。1个第一调制符号和1个第二调制符号叠加，得到1个叠加符号，映射到星座图上为1个星座点，按照表1，第一调制符号和第二调制符号叠加一共有16种可能的情况，所有可能的叠加符号映射到星座图上具有格雷属性，如图5所示，当a1：a2＝4:1时，按表1映射的第一调制符号和第二调制符号得到的叠加符号星座图。
将叠加符号X映射到时频资源上，发送给接收机。
可选的，接收机UE接收来自于发射机的发射信号，其中，所述发射信号是由实施例一所述得到的。接收机根据映射表解调出信息，如图5所示。
假设经过的无线信道为AWGN信道，发射信号只受到加性白噪声干扰，则数据符号或者说叠加符号会受到噪声干扰，表现在星座图上为，接收符号为与叠加星座点偏移一定欧式距离的某个点上。
对于边缘用户接收机来说，可以带着中心用户信息的干扰和噪声干扰，直接解调出本用户的信息。例如通过最大似然(Maximum Likelihood，ML)法或最小均方误差法，得到第一调制符号。然后将第一调制符号按照表1映射解调得到第一信息比特，解码第一信息比特得到边缘用户信息。
对于中心用户接收机来说，根据叠加星座图，通过最大似然法或最小均方误差法，解调出第一调制符号后，通过SIC去除第一调制符号，再通过最大似然法或最小均方误差法解出第二调制符号，然后将第二调制符号按照表1映射解调得到第二信息比特，解码第二信息比特得到用户信息。
本实施例中，通过映射表映射得到调制符号，然后调制符号直接叠加的方式，实现了从两组信息比特映射到有格雷属性的星座，从而简化了多用户信息的非正交复用。
图6为本发明多用户信息传输的调制方法三实施例的流程示意图。图7为本发明二实施例的叠加符号映射到星座图的示意图。如图6所示，该多用户信息传输的调制方法，包括：
步骤601、发射机获取第一信息比特和第二信息比特。
其中，发射机可以根据自身和每个接收机，即每个终端之间的信道情况，按匹配信道的编码方式，获得比特信息流。
步骤602、发射机将第一信息比特按照映射表的第一QPSK映射，获得第一调制符号。
步骤603、发射机将第二信息比特按照映射表的第二16QAM映射，获得第二调制符号。
所采用的映射表如表2所示：
表2
Figure PCTCN2016086449-appb-000002
Figure PCTCN2016086449-appb-000003
步骤604、发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号。
其中，第一调制符号X1和第二调制符号X2线性叠加，即第一调制符号X1和第二调制符号X2，分别乘上功率因子a1和a2后叠加，得到X，表示为X1·a1+X2·a2。1个第一调制符号和1个第二调制符号叠加，得到1个叠加符号，映射到星座图上为1个星座点，按照表2，第一调制符号和第二调制符号叠加一共有64种可能的情况，所有可能的叠加符号映射到星座图上具有格雷属性，如图7所示，当a1：a2＝4:1时，按表2映射的第一调制符号和第二调制符号得到的叠加符号星座图。
图8为本发明多用户信息传输的调制方法四实施例的流程示意图。图9为本发明三实施例的叠加符号映射到星座图的示意图。如图8所示，该多用户信息传输的调制方法，包括：
步骤801、发射机获取第一信息比特和第二信息比特。
其中，发射机可以根据自身和每个接收机，即每个终端之间的信道情况，按匹配信道的编码方式，获得比特信息流。
步骤802、发射机将第一信息比特按照映射表的第一BPSK映射，获得 第一调制符号。
步骤803、发射机将第二信息比特按照映射表的第二16QAM映射，获得第二调制符号。
所采用的映射表如表3所示：
表3
Figure PCTCN2016086449-appb-000004
步骤604、发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号。
其中，第一调制符号X1和第二调制符号X2线性叠加，即第一调制符号 X1和第二调制符号X2，分别乘上功率因子a1和a2后叠加，得到X，表示为X1·a1+X2·a2。1个第一调制符号和1个第二调制符号叠加，得到1个叠加符号，映射到星座图上为1个星座点，按照表3，第一调制符号和第二调制符号叠加一共有32种可能的情况，所有可能的叠加符号映射到星座图上具有格雷属性，如图9所示，当a1：a2＝4:1时，按表3映射的第一调制符号和第二调制符号得到的叠加符号星座图。
在本实施例中，通过映射表映射得到调制符号，然后调制符号直接叠加的方式，实现了从两组信息比特映射到有格雷属性的星座，从而简化了多用户信息的非正交复用。
从上述实施例可以看出，第一信息比特为1比特时，发射机将所述第一信息比特通过第一BPSK获得所述第一调制符号；第一信息比特为2比特时，所述发射机将所述第一信息比特通过第一QPSK，获得所述第一调制符号。
所述第二信息比特为2比特时，发射机将所述第二信息比特通过第二QPSK映射关系，获得所述第二调制符号，所述第二QPSK映射关系为：根据第一信息比特的值，按第一QPSK映射的调制符号实部取反，或者按第一QPSK映射的调制符号虚部取反，或者第一QPSK映射，或者按第一QPSK映射的调制符号实部和虚部均取反；
所述第二信息比特为4比特时，发射机将所述第二信息比特通过第二16正交幅度调制16QAM映射关系，获得所述第二调制符号，所述第二16QAM映射关系为：根据第一信息比特的值，按16QAM映射的调制符号实部取反，或者按16QAM映射的调制符号虚部取反，或者16QAM映射，或者按16QAM映射的调制符号实部和虚部均取反；
所述第二信息比特为6比特时，发射机将所述第二信息比特通过第二64正交幅度调制64QAM映射关系，获得所述第二调制符号，所述第二64QAM映射关系为：根据第一信息比特的值，按64QAM映射的调制符号实部取反，或者按64QAM映射的调制符号虚部取反，或者64QAM映射，或者按64QAM映射的调制符号实部和虚部均取反。
可以看出，第一调制符号是第一信息比特按LTE调制得到的调制符号， 第二调制符号是第二信息比特按LTE调制后，根据第一信息比特的值，对调制后的符号进行实部和/或虚部取反，或者实部和虚部保持不变，从而得到的调制符号。其中，根据第一信息比特的值，对调制后的符号进行实部和/或虚部取反，或者实部和虚部保持不变的规则可以由发射方和/或接收方设定。
例如，用代数公式表示，可以获得和表1、表2一样的效果。
序号 第一信息比特 第二信息比特 第一调制符号 第二调制符号
0 b(0)b(1) b(0)b(1)…b(n) x0 f(x0,x1)
其中x0为b(0)b(1)按LTE调制得到的调制符号，其中x1为b(0)b(1)…b(n)按LTE调制得到的调制符号，n为1或3或5。f(x0,x1)为以x0,x1为因变量的固定函数，其中，f(x0,x1)的实部和虚部的绝对值与x1相同，只是实部和/或虚部的符号可能与x1不同。
在上述映射表的每一行包括两组信息比特(b(0)b(1)、b(0)b(1)…b(n))、以及所述两组信息比特对应的两个调制符号(x0,、f(x0,x1))，该两个调制符号组成一组调制符号。映射表中每组调制符号(x0,、f(x0,x1))相叠加，映射到星座图上具有格雷属性。
图10为本发明发射机一实施例的流程示意图。如图10所示，该发射机，包括：第一确定模块101和叠加模块102，其中，
第一确定模块101，设置为：根据第一信息比特、第二信息比特和映射表，确定第一调制符号和第二调制符号，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性；
叠加模块101，设置为：将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号。
在本实施例中，发射机根据第一信息比特、第二信息比特和映射表，确定第一调制符号和第二调制符号，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性；所述发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号。通过映射表映射得到调制符号，然后调制符号直接叠加的方式，实现了从两组 信息比特映射到有格雷属性的星座，从而简化了多用户信息的非正交复用。
在上述实施例的基础上，第一确定模块101，设置为：将所述第一信息比特通过所述映射表的第一映射关系，获得所述第一调制符号；将所述第二信息比特通过所述映射表的第二映射关系，获得所述第二调制符号。
所述第一映射关系对应多个所述第二映射关系。
在上述实施例的基础上，所述第一确定模块101，设置为：
所述第一信息比特为1比特时，将所述第一信息比特通过第一二相相移键控BPSK获得所述第一调制符号；
所述第一信息比特为2比特时，将所述第一信息比特通过第一四相相移键控QPSK，获得所述第一调制符号。
在上述实施例的基础上，所述第一确定模块101，设置为：
所述第二信息比特为2比特时，将所述第二信息比特通过第二QPSK映射关系，获得所述第二调制符号，所述第二QPSK映射关系为：根据第一信息比特的值，按第一QPSK映射的调制符号实部取反，或者按第一QPSK映射的调制符号虚部取反，或者第一QPSK映射，或者按第一QPSK映射的调制符号实部和虚部均取反；
所述第二信息比特为4比特时，将所述第二信息比特通过第二16正交幅度调制16QAM映射关系，获得所述第二调制符号，所述第二16QAM映射关系为：根据第一信息比特的值，按16QAM映射的调制符号实部取反，或者按16QAM映射的调制符号虚部取反，或者16QAM映射，或者按16QAM映射的调制符号实部和虚部均取反；
所述第二信息比特为6比特时，将所述第二信息比特通过第二64正交幅度调制64QAM映射关系，获得所述第二调制符号，所述第二64QAM映射关系为：根据第一信息比特的值，按64QAM映射的调制符号实部取反，或者按64QAM映射的调制符号虚部取反，或者64QAM映射，或者按64QAM映射的调制符号实部和虚部均取反。
可选的，在上述实施例的基础上，所述叠加模块102，设置为：第一调制符号和第二调制符号进行线性叠加，获得叠加符号。
可选的，在上述实施例的基础上，所述叠加模块102，设置为：将所述第一调制符号于第一功率因子相乘，获得第一加权调制符号；将所述第二调制符号于第二功率因子相乘，获得第二加权调制符号；其中，所述第一功率因子为第一信息比特的功率占比的平方根，所述第二功率因子为第二信息比特的功率占比的平方根；第一信息比特的功率占比加上第二信息比特的功率占比等于1；将所述第一加权调制符号和所述第二加权调制符号相加，获得所述叠加符号。
图11为本发明发射机二实施例的流程示意图。如图11所示，该发射机，还可以包括，编码模块103，所述编码模块103，设置为：将第一比特流进行编码，获得第一信息比特；将第二比特流进行编码，获得第二信息比特。
可选的，该发射机，还可以包括，发送模块104，所述发送模块104，设置为：将所述叠加符号形成发射信号，并将所述发射信号发送至多个接收机。
图12为本发明接收机一实施例的流程示意图。如图12所示，一种接收机，包括：获取模块121和第二确定模块122，其中，
获取模块121，设置为：获取发射机发送的发射信号；
第二确定模块122，设置为：根据所述发射信号和映射表，确定所述发射机发送给自身的信息，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性。
在本实施例中，接收机获取发射机发送的发射信号；所述接收机根据所述发射信号和映射表，确定所述发射机发送给自身的信息，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性。实现了根据发射信号和映射表获得用户信息，从而简化了解调过程，进而提高了多用户信息的非正交复用效率。
在上述实施例的基础上，所述接收机为第一接收机，所述第二确定模块122，设置为：通过最大似然法或最小均方误差法，根据所述发射信号得到第 一调制符号，将所述第一调制符号按照所述映射表解调得到第一信息比特，解码第一信息比特得到所述发射机发送给自身的信息。
其中，所述第一接收机通常为边缘用户接收机。
在上述实施例的基础上，所述接收机为第二接收机，所述第二确定模块122，设置为：通过最大似然法或最小均方误差法，根据所述发射信号得到第一调制符号，通过串行干扰消除去除第一调制符号，通过最大似然法或最小均方误差法解出第二调制符号，将所述第二调制符号按照映射表解调得到第二信息比特，解码第二信息比特得到所述发射机发送给自身的信息。
所述第二接收机通常为中心用户接收机。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现上述多用户信息传输的调制方法。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现上述多用户信息传输的解调方法。
本领域普通技术人员可以理解上述实施例的全部或部分步骤可以使用计算机程序流程来实现，所述计算机程序可以存储于一计算机可读存储介质中，所述计算机程序在相应的硬件平台上(如系统、设备、装置、器件等)执行，在执行时，包括方法实施例的步骤之一或其组合。
可选地，上述实施例的全部或部分步骤也可以使用集成电路来实现，这些步骤可以被分别制作成一个个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。
上述实施例中的装置/功能模块/功能单元可以采用通用的计算装置来实现，它们可以集中在单个的计算装置上，也可以分布在多个计算装置所组成的网络上。
上述实施例中的装置/功能模块/功能单元以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。 上述提到的计算机可读取存储介质可以是只读存储器，磁盘或光盘等。
虽然本申请所揭露的实施方式如上，但所述的内容仅为便于理解本申请而采用的实施方式，并非用以限定本申请。任何本申请所属领域内的技术人员，在不脱离本申请所揭露的精神和范围的前提下，可以在实施的形式及细节上进行任何的修改与变化，但本申请的专利保护范围，仍须以所附的权利要求书所界定的范围为准。
工业实用性
本发明实施例通过映射表映射得到调制符号，然后调制符号直接叠加的方式，简化了调制过程，进而提高了多用户信息的非正交复用效率。

Claims (22)

  1. 一种多用户信息传输的调制方法，包括：
    发射机根据第一信息比特、第二信息比特和映射表，确定第一调制符号和第二调制符号，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性；
    所述发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号。
  2. 根据权利要求1所述的方法，其中，所述发射机根据第一信息比特、第二信息比特和映射表，确定第一调制符号和第二调制符号，包括：
    所述发射机将所述第一信息比特通过所述映射表的第一映射关系，获得所述第一调制符号；
    所述发射机将所述第二信息比特通过所述映射表的第二映射关系，获得所述第二调制符号。
  3. 根据权利要求2所述的方法，其中，所述第一映射关系对应多个所述第二映射关系。
  4. 根据权利要求2所述的方法，其中，所述发射机将所述第一信息比特通过所述映射表的第一映射关系，获得所述第一调制符号，包括：
    所述第一信息比特为1比特时，所述发射机将所述第一信息比特通过第一二相相移键控BPSK获得所述第一调制符号；
    所述第一信息比特为2比特时，所述发射机将所述第一信息比特通过第一四相相移键控QPSK，获得所述第一调制符号。
  5. 根据权利要求4所述的方法，其中，所述发射机将所述第二信息比特通过所述映射表的第二映射关系，获得所述第二调制符号，包括：
    所述第二信息比特为2比特时，所述发射机将所述第二信息比特通过第二QPSK映射关系，获得所述第二调制符号，所述第二QPSK映射关系为：根据第一信息比特的值，按第一QPSK映射的调制符号实部取反，或者按第 一QPSK映射的调制符号虚部取反，或者第一QPSK映射，或者按第一QPSK映射的调制符号实部和虚部均取反；
    所述第二信息比特为4比特时，所述发射机将所述第二信息比特通过第二16正交幅度调制16QAM映射关系，获得所述第二调制符号，所述第二16QAM映射关系为：根据第一信息比特的值，按16QAM映射的调制符号实部取反，或者按16QAM映射的调制符号虚部取反，或者16QAM映射，或者按16QAM映射的调制符号实部和虚部均取反；
    所述第二信息比特为6比特时，所述发射机将所述第二信息比特通过第二64正交幅度调制64QAM映射关系，获得所述第二调制符号，所述第二64QAM映射关系为：根据第一信息比特的值，按64QAM映射的调制符号实部取反，或者按64QAM映射的调制符号虚部取反，或者64QAM映射，或者按64QAM映射的调制符号实部和虚部均取反。
  6. 根据权利要求1-5任一项所述的方法，其中，所述发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号，包括：
    所述发射机将所述第一调制符号和所述第二调制符号进行线性叠加，获得叠加符号。
  7. 根据权利要求6所述的方法，其中，所述发射机将所述第一调制符号和第二调制符号进行线性叠加，获得叠加符号，包括：
    所述发射机将所述第一调制符号与第一功率因子相乘，获得第一加权调制符号；所述发射机将所述第二调制符号与第二功率因子相乘，获得第二加权调制符号；其中，所述第一功率因子为第一信息比特的功率占比的平方根，所述第二功率因子为第二信息比特的功率占比的平方根；第一信息比特的功率占比加上第二信息比特的功率占比等于1；
    所述发射机将所述第一加权调制符号和所述第二加权调制符号相加，获得所述叠加符号。
  8. 根据权利要求7所述的方法，其中，所述发射机根据第一信息比特、第二信息比特和映射表，确定第一调制符号和第二调制符号之前，还包括：
    所述发射机将第一比特流进行编码，获得第一信息比特；
    所述发射机将第二比特流进行编码，获得第二信息比特。
  9. 根据权利要求8所述的方法，其中，所述发射机将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号之后，还包括：
    所述发射机将将所述叠加符号形成发射信号，并将所述发射信号发送至多个接收机。
  10. 一种多用户信息传输的解调方法，包括：
    接收机获取发射机发送的发射信号；
    所述接收机根据所述发射信号和映射表，确定所述发射机发送给自身的信息，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性。
  11. 根据权利要求10所述的方法，其中，所述接收机根据所述发射信号和映射表，确定所述发射机发送给自身的信息包括：
    所述接收机为第一接收机，通过最大似然法或最小均方误差法，根据所述发射信号得到第一调制符号，将所述第一调制符号按照所述映射表解调得到第一信息比特，解码第一信息比特得到所述发射机发送给自身的信息。
  12. 根据权利要求10所述的方法，其中，所述接收机根据所述发射信号和映射表，确定所述发射机发送给自身的信息包括：
    所述接收机为第二接收机，通过最大似然法或最小均方误差法，根据所述发射信号得到第一调制符号，通过串行干扰消除去除第一调制符号，通过最大似然法或最小均方误差法解出第二调制符号，将所述第二调制符号按照映射表解调得到第二信息比特，解码第二信息比特得到所述发射机发送给自身的信息。
  13. 一种发射机，包括：
    第一确定模块，设置为：根据第一信息比特、第二信息比特和映射表，确定第一调制符号和第二调制符号，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关 系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性；
    叠加模块，设置为：将所述第一调制符号和所述第二调制符号进行叠加，获得叠加符号。
  14. 根据权利要求13所述的发射机，其中，所述第一确定模块，设置为：将所述第一信息比特通过所述映射表的第一映射关系，获得所述第一调制符号；将所述第二信息比特通过所述映射表的第二映射关系，获得所述第二调制符号。
  15. 根据权利要求14所述的发射机，其中，所述第一确定模块，设置为：
    所述第一信息比特为1比特时，将所述第一信息比特通过第一二相相移键控BPSK获得所述第一调制符号；
    所述第一信息比特为2比特时，将所述第一信息比特通过第一四相相移键控QPSK，获得所述第一调制符号；
    所述第二信息比特为2比特时，将所述第二信息比特通过第二QPSK映射关系，获得所述第二调制符号，所述第二QPSK映射关系为：根据第一信息比特的值，按第一QPSK映射的调制符号实部取反，或者按第一QPSK映射的调制符号虚部取反，或者第一QPSK映射，或者按第一QPSK映射的调制符号实部和虚部均取反；
    所述第二信息比特为4比特时，将所述第二信息比特通过第二16正交幅度调制16QAM映射关系，获得所述第二调制符号，所述第二16QAM映射关系为：根据第一信息比特的值，按16QAM映射的调制符号实部取反，或者按16QAM映射的调制符号虚部取反，或者16QAM映射，或者按16QAM映射的调制符号实部和虚部均取反；
    所述第二信息比特为6比特时，将所述第二信息比特通过第二64正交幅度调制64QAM映射关系，获得所述第二调制符号，所述第二64QAM映射关系为：根据第一信息比特的值，按64QAM映射的调制符号实部取反，或者按64QAM映射的调制符号虚部取反，或者64QAM映射，或者按64QAM映射的调制符号实部和虚部均取反。
  16. 根据权利要求13-15任一项所述的发射机，其中，所述叠加模块， 设置为：第一调制符号和第二调制符号进行线性叠加，获得叠加符号。
  17. 根据权利要求16所述的发射机，其中，所述叠加模块，设置为：将所述第一调制符号与第一功率因子相乘，获得第一加权调制符号；将所述第二调制符号与第二功率因子相乘，获得第二加权调制符号；其中，所述第一功率因子为第一信息比特的功率占比的平方根，所述第二功率因子为第二信息比特的功率占比的平方根；第一信息比特的功率占比加上第二信息比特的功率占比等于1；将所述第一加权调制符号和所述第二加权调制符号相加，获得所述叠加符号。
  18. 根据权利要求17所述的发射机，还包括：编码模块，所述编码模块，设置为：将第一比特流进行编码，获得第一信息比特；将第二比特流进行编码，获得第二信息比特。
  19. 根据权利要求18所述的发射机，还包括：发送模块，所述发送模块，设置为：将所述叠加符号形成发射信号，并将所述发射信号发送至多个接收机。
  20. 一种接收机，包括：
    获取模块，设置为：获取发射机发送的发射信号；
    第二确定模块，设置为：根据所述发射信号和映射表，确定所述发射机发送给自身的信息，所述映射表用于确定所述第一信息比特与所述第一调制符号，以及所述第二信息比特与所述第二调制符号的对应关系；所述映射表中每组调制符号相叠加，映射到星座图上具有格雷属性。
  21. 根据权利要求20所述的接收机，其中，所述接收机为第一接收机，所述第二确定模块，设置为：通过最大似然法或最小均方误差法，根据所述发射信号得到第一调制符号，将所述第一调制符号按照所述映射表解调得到第一信息比特，解码第一信息比特得到所述发射机发送给自身的信息。
  22. 根据权利要求20所述的接收机，其中，所述接收机为第二接收机，所述第二确定模块，设置为：通过最大似然法或最小均方误差法，根据所述发射信号得到第一调制符号，通过串行干扰消除去除第一调制符号，通过最大似然法或最小均方误差法解出第二调制符号，将所述第二调制符号按照映 射表解调得到第二信息比特，解码第二信息比特得到所述发射机发送给自身的信息。
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