WO2014183709A1 - 一种处理信号样点数据的方法及装置 - Google Patents
一种处理信号样点数据的方法及装置 Download PDFInfo
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- WO2014183709A1 WO2014183709A1 PCT/CN2014/078557 CN2014078557W WO2014183709A1 WO 2014183709 A1 WO2014183709 A1 WO 2014183709A1 CN 2014078557 W CN2014078557 W CN 2014078557W WO 2014183709 A1 WO2014183709 A1 WO 2014183709A1
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- signal sample
- sample data
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Classifications
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- 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
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- H03M7/3059—Digital compression and data reduction techniques where the original information is represented by a subset or similar information, e.g. lossy compression
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- H03M7/3068—Precoding preceding compression, e.g. Burrows-Wheeler transformation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
Definitions
- the invention relates to signal sample data of a Common Public Radio Interface (CPRI) of a Long Term Evolution (LTE) base station system (referred to as IQ data, and I channel data refers to real data of signal sample data, Q road)
- CPRI Common Public Radio Interface
- LTE Long Term Evolution
- I channel data refers to real data of signal sample data, Q road
- the data refers to the technical field of processing of the imaginary part data of the signal sample data, and in particular, the method and apparatus for processing the IQ data of the LTE base station system CPRI.
- the LTE base station device is a distributed base station, and is evolved by a baseband processing unit (eBBU, Evolved).
- eBBU baseband processing unit
- the Building Base Band Unit is composed of an eRRU (Evolved Radio Remote Unit).
- the eBBU and the eRRU are connected by optical fiber or cable, and the common public radio frequency interface protocol is used for data interaction.
- the networked networking connection between the BBU and multiple RRUs will occupy a large amount of transmission bandwidth.
- the transmission bandwidth of the current transmission access network is difficult to meet, and the compression of the IQ data for the general public radio interface (CPRI) is very A method worth reducing the interface bandwidth.
- CPRI general public radio interface
- the LTE system is a wireless network technology that supports OFDM (Orthogonal Frequency Division Multiplexing) and Multiple Input Multiple Output (MIMO) technologies.
- OFDM Orthogonal Frequency Division Multiplexing
- MIMO Multiple Input Multiple Output
- the OFDM signal is a superposition of random amplitude and phase signals. It has a high peak-to-average power ratio (PAPR). Most of the signal peaks are in a small range, and only a few signal peaks fluctuate greatly.
- PAPR peak-to-average power ratio
- the frequency domain characteristics of the IQ data of the CPRI interface of the LTE system are shown in Figure 1. There are similar characteristics. Most of the signal peaks are in a small range, and only a small number of signal peaks fluctuate greatly. The number of bits is encoded. The maximum value of the signal determines the number of bits of the code, while the other bits of the small amplitude signal are encoded with a high bit of zero. This coding efficiency is extremely low and the transmission load is increased.
- the basic principle of the block floating-point coding algorithm is to adjust the scale of the data block, and then perform the scale recovery after the calculation is completed.
- the block index is adjusted for the data block of length N, and the invalid high-order sign extension bits in the mantissa are removed, so that the data blocks share the same index.
- Adding and multiplying only the mantissa is as convenient as fixed-point arithmetic. Since only one bit position is reserved when the block index is adjusted for the data block, the finite bit length can be fully utilized, and the accuracy is improved.
- the introduction of the sharing index also gives a larger dynamic range than the fixed-point method, which is determined by the number of bits of the high-order sign extension bit of the largest absolute value in the data block.
- Block floating-point coding groups (or called blocks) signal samples, then solves the exponents for each set of samples, and encodes the mantissa to form a compressed array. Encoding the mantissa and the exponent separately increases the compression, but it also reduces the error caused by compression.
- two or more exponential difference joint coding methods can also be used to achieve better compression by reducing the number of bits used for each index coding. From a large number of statistical data analysis, for block floating-point coding, the output index values corresponding to two consecutive sample groups, their difference, 90% is in the range of ⁇ -1, 0, 1 ⁇ , 98% is located ⁇ -2, 1 , 0, 1 , 2 ⁇ within this range. This information can be used to modify the index code.
- Block floating-point coding can avoid all data being represented by a fixed number of bits, which is very suitable for encoding the frequency domain data of LTE system IQ, and there is no time domain and frequency domain joint characteristic for CPRI interface data of LTE radio base station system in related art.
- the solution for compression can avoid all data being represented by a fixed number of bits, which is very suitable for encoding the frequency domain data of LTE system IQ, and there is no time domain and frequency domain joint characteristic for CPRI interface data of LTE radio base station system in related art.
- a technical problem to be solved by embodiments of the present invention is to provide a method and apparatus for processing IQ data to reduce transmission bandwidth while reducing the cost of the transmission device.
- a method of processing signal sample data comprising:
- the frequency domain signal sample data is encoded and then transmitted.
- the method before the step of converting the time domain signal sample data to be transmitted into the frequency domain signal sample data, the method further includes:
- the step of converting time domain signal sample data to be transmitted into frequency domain signal sample data includes:
- the method further includes:
- the frequency domain signal sample data is amplitude-compressed to generate an amplitude compression factor and compressed signal sample data.
- the step of encoding the frequency domain signal sample data includes:
- the frequency domain signal sample data is encoded according to any of the following encoding methods: block floating point coding, fuzzy block adaptive quantization coding, block adaptive vector quantization coding, and block floating point quantization coding.
- An apparatus for processing signal sample data comprising: a conversion module and an encoding module, wherein: the conversion module is configured to: convert time domain signal sample data to be transmitted into frequency domain signal sample data;
- the encoding module is configured to: encode the frequency domain signal sample data, and then transmit.
- a buffer module is further included, where:
- the buffer module is configured to: buffer time domain signal sample data to be sent; when the number of samples of the buffered time domain signal sample data to be transmitted reaches a threshold, the time domain signal is processed as follows Sample point data:
- the method further includes: generating a module, where
- the conversion module is configured to convert time domain signal sample data to be transmitted into frequency domain signal sample data according to the following manner: converting the time domain signal sample data into a frequency domain signal sample by fast Fourier transform Point data
- the generating module is configured to: extract valid samples of the frequency domain signal sample data according to respective symmetry characteristics of the real part data and the imaginary part data, and generate a frequency domain signal sample data stream.
- an amplitude compression module is further included, where:
- the amplitude compression module is configured to: perform amplitude compression on the frequency domain signal sample data to generate an amplitude compression factor and compressed frequency domain signal sample data.
- the encoding module is configured to encode the frequency domain signal sample data as follows:
- the frequency domain signal sample data is encoded by any of the following encoding methods: block floating point coding, fuzzy block adaptive quantization coding, block adaptive vector quantization coding, and block floating point quantization coding.
- a method of processing signal sample data comprising:
- the decoded frequency domain signal sample data is converted into time domain signal sample data.
- the method further includes:
- the step of converting the decoded frequency domain signal sample data into time domain signal sample data includes:
- the complete frequency domain signal sample data is converted into time domain signal sample data by an inverse fast Fourier transform.
- An apparatus for processing signal sample data comprising: a decoding module and an inverse conversion module, wherein: the decoding module is configured to: decode received frequency domain signal sample data; and set the inverse conversion module to: decode The subsequent frequency domain signal sample data is converted into time domain signal sample data.
- a recovery module is further included, where:
- the recovery module is configured to: perform amplitude recovery on the decoded frequency domain signal sample data according to the amplitude compression factor extracted from the received frequency domain signal sample data; according to respective symmetry of the real part data and the imaginary part data The feature restores the frequency domain signal sample data after the amplitude recovery to the complete frequency domain signal sample data.
- the inverse conversion module is configured to convert the decoded frequency domain signal sample data into time domain signal sample data according to the following manner:
- the complete frequency domain signal sample data is converted into time domain signal sample data by an inverse fast Fourier transform.
- the method and device for processing IQ data using the frequency domain characteristics of the IQ data of the LTE system, first converting the time domain IQ data to the frequency domain IQ data at the transmitting end, removing the redundant information, and then performing coding.
- the number of coding points is reduced to achieve more efficient compression of the CPRI interface data of the LTE system, and meets the requirements of the transmission bandwidth of the current transmission access network, and can implement the high-efficiency compression and decompression functions of the fast and controllable mode of the CPRI interface data of the LTE radio base station system.
- 1 is a schematic diagram of frequency domain characteristics of IQ data of an LTE system
- FIG. 2 is a flowchart of a method for processing IQ data by a transmitting end according to an embodiment of the present invention
- FIG. 3 is a flowchart of a method for processing IQ data by a receiving end according to an embodiment of the present invention
- FIG. 4 is a schematic block diagram of a system for processing IQ data according to an embodiment of the present invention.
- FIG. 5 is a schematic diagram of an apparatus for processing IQ data by a transmitting end according to an embodiment of the present invention
- FIG. 6 is a schematic diagram of an apparatus for processing IQ data by a receiving end according to an embodiment of the present invention
- FIG. 7 is an IQ interleaving of an embodiment of the present invention
- FIG. 2 is a flowchart of a method for processing IQ data by a transmitting end according to an embodiment of the present invention. As shown in FIG. 2, the method includes the following steps:
- SI 1 Convert time domain IQ data to be transmitted into frequency domain IQ data
- FIG. 3 is a flowchart of a method for processing IQ data by a receiving end according to an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps:
- the sending device may include:
- the conversion module 401 is configured to: convert time domain IQ data to be transmitted into frequency domain IQ data
- the encoding module 402 is configured to: encode the frequency domain IQ data and then transmit.
- the receiving device can include:
- the decoding module 403 is configured to: decode the received frequency domain IQ data
- the inverse conversion module 404 is configured to: convert the decoded frequency domain IQ data into time domain IQ data.
- the frequency domain characteristics of the IQ data of the LTE system are mainly used, and the time domain IQ data is first converted to the frequency domain IQ data at the transmitting end, the redundant information is removed, and then the coding is performed to reduce the number of coding points. More effective compression. Therefore, the decoded frequency domain IQ data is inversely converted to the time domain IQ data at the receiving end.
- FIG. 5 is a schematic diagram of an apparatus for processing IQ data by a transmitting end according to an embodiment of the present invention. As shown in FIG. 5, the apparatus includes:
- the buffer module 501 is configured to: buffer the time domain IQ data to be sent;
- the I (real) channel and the Q (imaginary) channel data are not separately compressed, but the I channel data is The Q channel data is interspersed to obtain 1-1 Q-1 1 2-2 Q-2...: [ ⁇ 64 Q- 64 such a buffered data block, that is, the time domain IQ sample data to be transmitted is stored, when stored When the IQ sample number reaches the buffer size (or the threshold value, assuming B), as shown in Figure 7, the I channel (I way) data is placed according to the I path (Q path) data of a sample first, and then Put down the I (Q) and Q (I) data of a sample, intersperse the buffer data, and obtain a column of interpolated data with a length of 2*B. The interspersed data is sent to the conversion. Module.
- the conversion module 502 is configured to: convert the interpolated time domain IQ data into frequency domain IQ data; in this embodiment, the conversion module can perform FFT (Fast Fourier Transformation) on the inserted interpolated IQ time domain data. Leaf transformation), get the frequency domain IQ data.
- FFT Fast Fourier Transformation
- the generating module 503 is configured to: extract valid samples of the frequency domain IQ data according to respective symmetry characteristics of the I channel data and the Q channel data, and generate a frequency domain IQ data stream;
- the effective number of points is extracted from the frequency domain I and Q path data, and the output I and Q path data lengths are both B + l.
- An amplitude compression module or compression module 504 is configured to: perform amplitude suppression on the frequency domain IQ data stream to generate an amplitude compression factor F and compressed IQ data;
- the encoding module 505 is configured to: encode the compressed IQ data
- the first data can be removed from the amplitude-compressed I-channel and Q-path data, and block floating-point coding is performed separately, and the encoded data and the first input data are output.
- the transmitting module 506 is configured to: transmit the amplitude compression factor F and the encoded IQ data.
- 6 is a schematic diagram of an apparatus for processing IQ data at a receiving end according to an embodiment of the present invention. As shown in FIG. 6, the apparatus includes:
- the receiving module 601 is configured to: receive data and extract an amplitude compression factor F and the encoded IQ data;
- the decoding module 602 is configured to: perform decoding processing on the IQ data;
- the recovery module 603 is configured to: perform amplitude recovery on the decoded IQ data according to the amplitude compression factor F to obtain corresponding frequency domain IQ data outputted by the generating module of FIG. 3, and recover according to symmetry of each of the I channel and the Q channel data. Obtaining corresponding complete IQ frequency domain data outputted by the conversion module of FIG. 3; the inverse conversion module 604 is configured to: process the frequency domain IQ data to obtain time domain IQ data; in this embodiment, the complete frequency domain IQ data can be IFFT, get time domain IQ interpolated data. The time domain IQ sample data is then recovered according to the IQ interleaving method shown in FIG.
- the buffer module 605 is configured to: after processing the time domain IQ data into two channels of I and Q, buffering for subsequent signal processing.
- Embodiments of the present invention also provide a system for processing IQ data, the system comprising the above-mentioned device for processing IQ data at the transmitting end and the device for processing IQ data at the receiving end.
- the IQ data IQ has its own symmetry characteristics. Because the 63 points of the real and imaginary parts (66:128) are redundant information, there is no need to participate in the encoding.
- the first 65 data can be used to recover the original time domain signal through the IFFT at the decoding end. For amplitude compression, different compression factors, 1 , 2, 4 to 256, are chosen to obtain different frequency domain amplitude compression.
- the number of chips is not compressed separately for the I channel and the Q channel data, but the I channel data is interspersed with the Q channel data to obtain 1-1 Q-1 1 2 Q — 2. .1—64 Q 64 A buffered block of data.
- the FFT transform is performed on the obtained 128-point real signal, and only the real part and the imaginary part of the first point to the 65th point are subjected to block floating-point coding respectively after the transformation.
- Block floating point coding is performed on the I path valid signal and the Q path valid signal after the FFT.
- the size of the buffer obtained after the first data is removed from the I path and the Q path is 64, and the 64 sample values are read in the block float. Point code.
- the 64-dimensional data is divided into four groups and divided into 16 groups of data blocks. Then determine the maximum value Block_max of 16 blocks of data. Then determine the index of each block by formulas (1) and (2):
- the coded signal After the coded signal arrives at the receiving end, it performs decoding, amplitude boosting, and inverse FFT transform to obtain a time domain signal.
- the amplitude increase is the "inverse" of the amplitude compression
- the inverse FFT is the "inverse" of the FFT, which is not introduced.
- Decoding is the "inverse" of the encoding.
- the data obtained after decoding is the first point to the 65th point. For the real part, simply flip the second point to the 64th point with respect to the 65th point.
- the FFT transform is combined with the block floating-point coding, and the frequency domain features of the data are combined to remove redundant information, reduce the number of code points, and perform compression more effectively.
- the compression effect of the embodiment of the present invention is remarkable, and with the development of the hardware, the improvement space is large.
- the embodiments of the present invention may further use other coding schemes according to the frequency domain statistical characteristics of the LTE system IQ data, such as fuzzy block adaptive quantization coding (FBAQ), block adaptive vector quantization coding (BAVQ), and block floating. Point quantization coding (BFPQ) and the like, it is expected to obtain a further improvement in compression performance.
- FBAQ fuzzy block adaptive quantization coding
- BAVQ block adaptive vector quantization coding
- BFPQ Point quantization coding
- all or a portion of the above steps may be performed by a program to instruct the associated hardware, such as a read only memory, a magnetic disk, or an optical disk.
- all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits.
- each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.
- the method and device for processing IQ data according to the above technical solution, using the frequency domain characteristics of the IQ data of the LTE system, first converting the time domain IQ data to the frequency domain IQ data at the transmitting end, removing the redundant information, and then performing coding.
- the number of coding points is reduced to achieve more efficient compression of the CPRI interface data of the LTE system, and meets the requirements of the transmission bandwidth of the current transmission access network, and can implement the high-efficiency compression and decompression functions of the fast and controllable mode of the CPRI interface data of the LTE radio base station system. Therefore, the present invention has strong industrial applicability.
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Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP14797749.0A EP3065324A4 (en) | 2013-12-06 | 2014-05-27 | METHOD AND DEVICE FOR PROCESSING SIGNAL COLLECTION POINT DATA |
| JP2016536569A JP6223575B2 (ja) | 2013-12-06 | 2014-05-27 | 信号サンプル点データの処理方法及び装置 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310659571.1A CN104702369B (zh) | 2013-12-06 | 2013-12-06 | 一种处理信号样点数据的方法及装置 |
| CN201310659571.1 | 2013-12-06 |
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| Publication Number | Publication Date |
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| WO2014183709A1 true WO2014183709A1 (zh) | 2014-11-20 |
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| PCT/CN2014/078557 Ceased WO2014183709A1 (zh) | 2013-12-06 | 2014-05-27 | 一种处理信号样点数据的方法及装置 |
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| Country | Link |
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| EP (1) | EP3065324A4 (zh) |
| JP (1) | JP6223575B2 (zh) |
| CN (1) | CN104702369B (zh) |
| WO (1) | WO2014183709A1 (zh) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194667A (zh) * | 2018-09-18 | 2019-01-11 | 上海创远仪器技术股份有限公司 | 基于频域检测的实现iq数据信号数据压缩与传输功能的装置 |
| CN114666236A (zh) * | 2022-03-29 | 2022-06-24 | 北京扬铭科技发展有限责任公司 | 一种全自动信号检测识别报警方法 |
| US11489542B2 (en) | 2018-11-20 | 2022-11-01 | Samsung Electronics Co., Ltd. | Method, device and system for data compression and decompression |
| CN118132522A (zh) * | 2024-05-10 | 2024-06-04 | 成都联屹科技有限公司 | 数据压缩装置、方法及芯片 |
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| CN108092669B (zh) * | 2017-12-28 | 2020-06-16 | 厦门大学 | 一种基于离散余弦变换的自适应数据压缩方法及系统 |
| EP3895320A1 (en) * | 2018-12-10 | 2021-10-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Data transmission of value pair in network systems |
| US11605166B2 (en) | 2019-10-16 | 2023-03-14 | Parsons Corporation | GPU accelerated image segmentation |
| WO2021150594A1 (en) * | 2020-01-20 | 2021-07-29 | Parsons Corporation | Narrowband iq extraction and storage |
| US11619700B2 (en) | 2020-04-07 | 2023-04-04 | Parsons Corporation | Retrospective interferometry direction finding |
| US11569848B2 (en) | 2020-04-17 | 2023-01-31 | Parsons Corporation | Software-defined radio linking systems |
| US12483272B2 (en) | 2021-02-18 | 2025-11-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Encoding and decoding complex data |
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| CN109194667A (zh) * | 2018-09-18 | 2019-01-11 | 上海创远仪器技术股份有限公司 | 基于频域检测的实现iq数据信号数据压缩与传输功能的装置 |
| US11489542B2 (en) | 2018-11-20 | 2022-11-01 | Samsung Electronics Co., Ltd. | Method, device and system for data compression and decompression |
| CN114666236A (zh) * | 2022-03-29 | 2022-06-24 | 北京扬铭科技发展有限责任公司 | 一种全自动信号检测识别报警方法 |
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| CN118132522A (zh) * | 2024-05-10 | 2024-06-04 | 成都联屹科技有限公司 | 数据压缩装置、方法及芯片 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3065324A1 (en) | 2016-09-07 |
| CN104702369B (zh) | 2019-10-11 |
| JP2016539582A (ja) | 2016-12-15 |
| JP6223575B2 (ja) | 2017-11-01 |
| CN104702369A (zh) | 2015-06-10 |
| EP3065324A4 (en) | 2016-09-07 |
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