WO2014179902A1 - Procédé et appareil de retour d'informations de livre de codes pour l'extraction de canaux multi-antenne dans un système mimo - Google Patents

Procédé et appareil de retour d'informations de livre de codes pour l'extraction de canaux multi-antenne dans un système mimo Download PDF

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WO2014179902A1
WO2014179902A1 PCT/CN2013/000557 CN2013000557W WO2014179902A1 WO 2014179902 A1 WO2014179902 A1 WO 2014179902A1 CN 2013000557 W CN2013000557 W CN 2013000557W WO 2014179902 A1 WO2014179902 A1 WO 2014179902A1
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codebook
level
codeword
rank
complete
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English (en)
Chinese (zh)
Inventor
武露
刘皓
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Nokia Shanghai Bell Co Ltd
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Alcatel Lucent Shanghai Bell Co Ltd
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Priority to PCT/CN2013/000557 priority Critical patent/WO2014179902A1/fr
Priority to PCT/CN2013/000681 priority patent/WO2014179903A1/fr
Priority to CN201380042419.7A priority patent/CN104541470B/zh
Publication of WO2014179902A1 publication Critical patent/WO2014179902A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0645—Variable feedback
    • H04B7/065—Variable contents, e.g. long-term or short-short
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting

Definitions

  • the present invention relates generally to mobile communication technologies and, more particularly, to a Multiple User Multiple Input Multiple Output (MU MIMO) transmission technique.
  • MU MIMO Multiple User Multiple Input Multiple Output
  • a method for 4-antenna downlink channel feedback for a multiple input multiple output system comprising: detecting a downlink multi-antenna channel; estimating long-term broadband channel characteristics according to the result of the detecting, Determining a first codeword in the first-level decimation codebook corresponding to the rank R; any one of the complete first-level codebooks is a four-diagonal matrix, wherein the diagonal is two 2 x C a block matrix, the column vectors of the two 2 x C block matrices are selected from a DFT beam vector; wherein the first level decimation codebook is extracted from the complete first level via at least one of the following three extraction modes Codebook: 1) remove some of the codewords with partial DFT beam overlap with each other, 2) remove some of the codewords that are repeated for all DFT beams with each other, 3) remove some of the codewords to reduce the DFT beam An optional range; feeding back an index of the first codeword; determining, according to the short-term channel
  • An embodiment of the above method further comprises: determining a rank of the downlink transmission.
  • an apparatus for 4-antenna downlink channel feedback for a multiple input multiple output system comprising: a detection module configured to detect a downlink multi-antenna channel; a first determining module configured to be configured according to Determining the long-term wideband channel characteristic of the result of the detection, determining the first codeword in the first-level decimation codebook corresponding to the rank R; any one of the complete first-level codebooks is four a diagonal matrix, wherein the diagonal is two 2 x C block matrices, and the column vectors of the two 2 x C block matrices are selected from ( ⁇ ! ⁇ !
  • the first level decimation codebook Extracted from the complete first level codebook via at least one of the following three extraction methods: 1) removing a portion of the codewords with partial DFT beam overlaps with each other, 2) for all DFT beams between each other Repeating codewords, removing a portion, 3) removing a portion of the codewords to reduce the selectable range of the DFT beam; a feedback module configured to feed back an index of the first codeword; a second determining module configured to The result of the test Determining, according to the short-term channel characteristic and the first codeword, a second codeword in the second-level decimation codebook corresponding to the rank R; any one of the complete second-level codebooks is 2C x An R matrix, the 2C x R matrix is used for column selection from the first codeword for each polarization direction and layers, and introducing phase offset information between different polarization directions; wherein the second The level-decimated codebook is extracted from the complete second-level codebook via at least
  • An embodiment of the above apparatus further includes a third determining module configured to determine a rank of the downlink transmission.
  • a user equipment that includes the apparatus described above.
  • a method for a base station having four transmit antennas for a multiple input multiple output system including: receiving a rank of a downlink transmission fed back by a user equipment, and a first level extraction codebook An index of a codeword, and an index of the second codeword in the second-stage decimation codebook; any codeword in the complete first-level codebook is a four-diagonal matrix, wherein the diagonal is two 2x a C block matrix, the column vectors of the two 2 x C block matrices are selected from a DFT beam vector; wherein the first level decimation codebook is extracted from the complete first by at least one of the following three extraction modes Level codebook: 1) For codewords with partial DFT beam overlap with each other, remove a part, 2) remove some of the codewords for all DFT beams repeated with each other, 3) remove some of the codewords to reduce the DFT beam Optional range; any codeword in the complete second-level codebook is a 2C x R matrix, and the
  • an apparatus for a base station having four transmit antennas for a multiple input multiple output system comprising: a receiving module configured to receive a rank of a downlink transmission fed back by a user equipment, first An index of the first codeword in the decimated codebook, and an index of the second codeword in the second decimated codebook; any codeword in the complete first-level codebook is a four-diagonal matrix, wherein the diagonal There are two 2 x C block matrices, the column vectors of the two 2 x C block matrices are selected from Qi DFT beam vectors; wherein the first level decimation codebook is via at least one of the following three extraction methods; Extracted from the complete first-level codebook: 1) remove some of the codewords with partial DFT beam overlap with each other, 2) remove some of the codewords that are repeated for all DFT beams with each other, 3) remove parts Codeword to reduce the selectable range of the DFT beam; any codeword in the complete second-level codebook is
  • a base station apparatus that includes the apparatus described above.
  • the second level extraction codebook is extracted from the complete by at least one of 1), 2), 3) of the four extraction methods.
  • the second level codebook is extracted from the complete by at least one of 1), 2), 3) of the four extraction methods.
  • the column vector of the codeword in the complete first level codebook includes an equally spanned DFT beam vector and an orthogonal DFT beam vector, or an equally spanned DFT beam vector There are no mutually orthogonal DFT beam vectors.
  • the column vector corresponding to any one of the complete second level codebooks is configured to independently select the same or for each polarization direction. Different DFT beams are configured or selected to select the same DFT beam for each polarization direction.
  • any one of the complete second level codebooks are configured to independently select the same or for each polarization direction Different DFT beams and select the same DFT beam for each layer, or configure each layer to independently select the same or different DFT beams and select the same DFT beam for each polarization direction, or configure for each pole
  • the direction selects the same or different DFT beams independently and independently selects the same or different DFT beams for each layer, or configures the same DFT beam for each polarization direction and selects the same DFT for each layer Beam.
  • the first level codebook corresponding to rank 3 or 4 is a true subset of the complete first level codebook corresponding to rank 1 or 2.
  • the column vector of the 2 x C block matrix includes orthogonal DFT beam vectors in the second level codebook.
  • the column vector of any of the codewords is configured to independently select the same or different DFT beams for each polarization direction, or to select the same DFT beam for each polarization direction.
  • the concept of "layer” above and below can also be understood as “data flow” under multi-streaming applications.
  • the rank of the selected codebook is 1, 2, 3 or 4, which means that the number of downstream data streams involved in the corresponding application is 1, 2, 3 or 4.
  • the construction of the first-level codebook and the second-level codebook should usually also consider the relationship between different data streams (different layers) (for example, beam selection is the same or different).
  • the above technical solution introduces orthogonal DFT (Discrete Fourier Transform) beam selection in the two-stage codebook index feedback, which is more suitable for the MIMO application of the 4 downlink transmit antenna configuration in the cross-polarization direction.
  • orthogonal DFT Discrete Fourier Transform
  • the above scheme introduces a suitable codebook extraction in the 4-antenna downlink channel two-level codebook index feedback, which is suitable for codebook reuse under the feedback overhead limited situation.
  • Figure 1 illustrates an application scenario in accordance with one embodiment of the present invention
  • FIG. 2 shows a flow chart of a method for 4-antenna downlink channel feedback for a multiple input multiple output system in accordance with one embodiment of the present invention
  • FIG. 3 is a block diagram showing an arrangement of a 4-antenna downlink channel feedback suitable for a multiple input multiple output system in accordance with an embodiment of the present invention
  • FIG. 4 shows a flow chart of a method in a base station having 4 transmit antennas suitable for a multiple input multiple output system, in accordance with one embodiment of the present invention
  • Figure 5 illustrates a four-transmitted antenna suitable for a multiple input multiple output system in accordance with one embodiment of the present invention. Schematic diagram of the structure of the device in the base station. detailed description
  • FIG. 1 shows a schematic diagram of an application scenario according to an embodiment of the present invention.
  • the technical solution of the present invention is suitable for a multiple input multiple output system.
  • the base station device 1 and the user equipment 2 are included in the scenario.
  • the technical solution of the present invention is suitable for, for example, but not limited to, Precoding Matrix Index (PMI) feedback between the base station device 1 and the user equipment 2.
  • PMI Precoding Matrix Index
  • the base station or the base station device referred to herein is, for example but not limited to, the Node B or the evolved Node B (eNB) in the LTE system or the LTE-A system, and the present invention
  • the technical solution is also not limited to the applicable LTE system or the LTE-A system.
  • the index feedback here uses a two-stage codebook scheme, and a complete codeword W corresponds to the downlink channel characteristics, which can be expressed as two, ⁇ .
  • the first codeword ⁇ is taken from the first level codebook B, which is used to characterize the long-term broadband channel characteristics.
  • the second codeword W 2 from the second-stage codebook B l for characterizing the short-term channel characteristics. Since the second codeword is derived from channel detection on the corresponding sub-bands according to the service requirements of the user equipment, it is often also used to characterize the channel characteristics of several corresponding sub-bands.
  • the first codeword can be fed back for a longer period of time, while the second codeword can be fed back with a shorter period.
  • the method 20 includes steps 21, 22, 23, 24, and 25 performed by the user device 2.
  • user equipment 2 detects the downlink multi-antenna channel.
  • the multiple antennas of the downlink multi-antenna channel detected by the user equipment 2 are the transmitting antennas of the base station apparatus 1.
  • the user equipment 2 determines the first codeword in the first-level decimation codebook corresponding to the rank R according to the long-term wideband channel characteristics estimated by the detection result.
  • Any codeword in the complete first-level codebook is a four-diagonal matrix, where two 2 x C block matrices are on the diagonal, and the column vectors of the two 2 x C block matrices are selected from ( ⁇ DFT beam vector.
  • the first-level decimation codebook is extracted from the complete first-level codebook by using at least one of the following three extraction modes: 1) For a codeword with a partial DFT beam overlap with each other, a part is removed, 2 For a codeword that repeats all DFT beams with each other, remove a portion, and 3) remove some of the codewords to reduce the selectable range of the DFT beam.
  • step 23 the user equipment 2 feeds back the index of the first codeword.
  • the user equipment 2 determines the second codeword in the second-level decimation codebook corresponding to the rank R according to the short-term channel characteristics estimated by the detection result and the first codeword.
  • Any one of the complete second-level codebooks is a 2C x R matrix for selecting columns from the first codeword for each polarization direction and layers, and for different poles Phase offset information is introduced between the directions.
  • the second-level decimation codebook is extracted from the complete second-level codebook by at least one of the following four extraction methods: 1) limiting the column selection option; 2) limiting the phase offset factor option; 3) removing Different DFT beam selection between different polarization directions; 4) Removal of different DFT beam selections between different layers.
  • step 25 user equipment 2 feeds back the index of the second codeword.
  • the method 20 above further includes the step 26, the user equipment 2 determining the rank R of the downlink transmission.
  • R can be 1, 2, 3 or 4. This step 26 is typically performed prior to step 22.
  • the apparatus 30 includes a detection module 31, a first determination module 32, a second determination module 33, and a feedback module 34.
  • the device 30 is typically configured in the user equipment 2.
  • the detection module 31 is configured to detect a downlink multi-antenna channel.
  • the first determining module 32 is configured to determine a first codeword in the first-level decimation codebook corresponding to the rank R according to the long-term wideband channel characteristic estimated according to the result of the detection.
  • Any codeword in the complete first-level codebook is a four-diagonal matrix with two 2 X C block matrices on the diagonal, and the column vectors of the two 2 X C block matrices are selected from the DFT beam vectors.
  • the first-level decimation codebook is extracted from the complete first-level codebook by using at least one of the following three extraction modes: 1) For a codeword with a partial DFT beam overlap with each other, a part is removed, 2 For a codeword that repeats all DFT beams with each other, remove a portion, and 3) remove some of the codewords to reduce the selectable range of the DFT beam.
  • Feedback module 34 is configured to feed back an index of the first codeword.
  • the second determining module 33 is configured to determine, according to the short-term channel characteristics estimated by the detection result and the first codeword, the second codeword in the second-level decimation codebook corresponding to the rank R.
  • Any codeword in the complete second-level codebook is a 2C XR matrix, which is used for column selection from the first codeword for each polarization direction and each layer, and for different polarization directions Phase offset information is introduced between them.
  • the second level of codebook is selected by the following four Extracting from the complete second level codebook by at least one of: 1) limiting column selection options; 2) limiting phase offset factor options; 3) removing different DFT beam selections between different polarization directions; 4) Remove different DFT beam selections between different layers.
  • Feedback module 34 is also configured to feed back an index of the second codeword.
  • the apparatus 30 described above further includes a third determining module 35 configured to determine the rank R of the downlink transmission.
  • R can be 1, 2, 3 or 4.
  • the rank R is typically determined prior to determining the first codeword and the second codeword.
  • the method 40 includes steps 41, 42 performed by the base station device 1.
  • the base station device 1 receives the rank of the downlink transmission fed back by the user equipment, the index of the first codeword in the first-level decimation codebook, and the index of the second codeword in the second-level decimation codebook.
  • Any codeword in the complete first-level codebook is a four-diagonal matrix, where two 2 x C-block matrices are on the diagonal, and the column vectors of the two 2 x C-block matrices are selected from ( ⁇ ! ⁇ !
  • the first-stage decimation codebook is extracted from the complete first-level codebook via at least one of the following three extraction modes: 1) for partial DFT beam overlap with each other Codewords, remove a portion, 2) remove some of the codewords that are repeated for all DFT beams with each other, 3) remove some of the codewords to reduce the selectable range of DFT beams.
  • any one of the complete second-level codebooks is a 2C x R matrix for selecting columns from the first codeword for each polarization direction and layers, and for different poles I enter phase offset information between the directions; wherein the second-level decimation codebook is extracted from the complete second-level codebook by at least one of the following four extraction methods: 1) limiting the column selection option; 2) Limit phase offset factor options; 3) Remove different DFT beam selections between different polarization directions; 4) Remove different DFT beam selections between different layers.
  • the base station device 1 determines the downlink channel characteristics according to the rank, the index of the first codeword, and the index of the second codeword.
  • Figure 5 is a block diagram showing the structure of a device 50 in a base station having 4 transmit antennas suitable for a multiple input multiple output system in accordance with one embodiment of the present invention.
  • the apparatus 50 includes a receiving module 51 and a channel characteristic determining module 52.
  • the device 50 is typically configured in the base station device 1.
  • the receiving module 51 is configured to receive the rank of the downlink transmission fed back by the user equipment, the index of the first codeword in the first-level decimated codebook, and the index of the second codeword in the second-level decimated codebook.
  • Any codeword in the complete first-level codebook is a four-diagonal matrix, where two 2 x C block matrices are on the diagonal, and the column vectors of the two 2 x C block matrices are selected from ( ⁇ DFT) a beam vector; wherein the first-stage decimation codebook is extracted from the complete first-level codebook via at least one of the following three extraction modes: 1) for a codeword having a partial DFT beam overlap with each other, Remove a part, 2) remove some of the codewords that are repeated for all DFT beams with each other, 3) remove some of the codewords to reduce An optional range of DFT beams.
  • Any codeword in the complete second-level codebook is a 2CxR matrix, which is used for column selection from the first codeword for each polarization direction and each layer, and between different polarization directions Introducing phase offset information; wherein the second-level decimation codebook is extracted from the complete second-level codebook by using at least one of the following four extraction modes: 1) limiting column selection options; 2) limiting phase offset Shift factor options; 3) Remove different DFT beam selections between different polarization directions; 4) Remove different DFT beam selections between different layers.
  • the channel characteristic determining module 52 is configured to determine a downlink channel characteristic based on the rank, an index of the first codeword, and an index of the second codeword.
  • the codebooks of rank 1 and rank 2 use the same first-level codebook B l B ⁇ the total number of codewords is 16, and the index feedback is encoded by 4 bits.
  • the following variables need to be considered, including the beam set size C of each block matrix, beam granularity Q1, beam selection ( ⁇ ⁇ , ⁇ 2 overwhelm, ⁇ , ⁇ ) and beam overlap.
  • Complete first level code The general formula for this design can be expressed as:
  • the size of the beam set in the diagonal block matrix in the first codeword is 4, the beam granularity is 16, and the beam selection is set to And ⁇ takes a value between 0 and 15.
  • the beam set includes adjacent and orthogonal DFT beams.
  • the beam spacing between adjacent beams is 2 ⁇ /16, and the orthogonal beam spacing is ⁇ .
  • Any codeword ⁇ is expressed as:
  • Wave The beam set includes equal-span DFT waves with a beam spacing between adjacent beams of 2 ⁇ /16. Any codeword is represented as
  • Such a first level codebook is not redundant.
  • the beam set includes adjacent and orthogonal DFT beams. Beams between adjacent beams The interval is 2 ⁇ /32, and the orthogonal beam spacing is ⁇ . Any codeword ⁇ is expressed as:
  • the beam set includes adjacent and orthogonal DFT beams. Beams between adjacent beams The interval is 2 ⁇ /32, and the orthogonal beam spacing is ⁇ . Any codeword is expressed as:
  • the beam set includes equal-span DFT beams.
  • the beam spacing between adjacent beams is 2 ⁇ /32. Any codeword ⁇ indicates For
  • the beam set includes 2 adjacent DFT beams with a beam spacing of 2 ⁇ /16.
  • Any codeword ⁇ is expressed as:
  • the beam set includes orthogonal DFT beams with a beam spacing of ⁇ . Any code word is expressed as:
  • the beam set includes adjacent
  • the size of the beam set in the diagonal block matrix in the first codeword C is 2 or 4, and includes a plurality of equally spanned or orthogonal DFT beams.
  • the orthogonal beam spacing is fixed to ⁇ , the equal span DFT beam spacing is in the beam granularity
  • Qi When Qi is 32, it can be 2m7T/32 (where m is arbitrarily between 1 and 15). When the beam size is 16, it can be 2 ⁇ /16 (where m is any value between 1 and 7).
  • the beam selection method of different polarization directions should be considered according to the structure of the first-stage codebook.
  • e/ represents a column selection vector with only the first/row element being non-zero (eg, 1)
  • Q 2 represents the phase offset granularity
  • the block matrix X n beam set has a size C of 4, and independently selects the same or different DFT beams for each polarization direction, that is, the sum y 2 or in any column of the second code word W 2
  • the same or different, such second level codebook is adapted to match the first level codebook 8 with redundancy.
  • the number of codewords N 2 is 16 and the 4-bit index feedback is used.
  • the beam selection and phase offset information have four options, respectively, and the 2-bit index feedback is used respectively.
  • Any code word W 2 in the second level codebook B 2 is expressed as:
  • only the column selection vector whose first row element is non-zero (for example, 1) is a column selection vector in which only the second row element is non-zero (for example, 1), and 3 ⁇ 4 is only the third row element is non-zero.
  • a column selection vector (for example, 1), 3 ⁇ 4 is a column selection vector with only the 4th row element being non-zero (for example, 1), which is defined the same below.
  • Embodiment 1.2.2 block matrix exerciseThe size of the medium beam set C is 4, and the same DFT beam is selected for each polarization direction, that is, the sum 2 of the second code word W 2 is the same, such a second level codebook is adapted to not redundant first level codebook ⁇ match the second stage corresponding to the rank 1 codebook codeword number N 2 to 16, 4 to preclude the use of Special index feedback, where the beam selection and phase offset information have four options, respectively, using 2-bit index feedback.
  • Any code word W 2 in the second level codebook B 2 is expressed as:
  • the size C of the beam set in the block matrix X n is 2, and the same DFT beam is selected for each polarization direction, that is, the sum 2 of the second code word W 2 is the same, such that
  • the secondary codebook is adapted to match the first level codebook without redundancy.
  • the number of codewords N 2 is 8, and 3-bit index feedback is used. There are two options for beam selection, one-bit index feedback, and four options for phase offset information. 2 Use a 2-bit index to reverse. Any code word W 2 in the second level codebook B 2 is expressed as:
  • Embodiment 1.2.4 Block Matrix
  • the size of the X n beam set C is 2, and the same or different DFT beams are independently selected for each polarization direction, that is, yi and y in any column of the second code word W 2 2 or the same or different.
  • the number of codewords in the second-level codebook is N2, and the 4-bit index feedback is used.
  • the beam selection and phase offset information have four options, respectively, and the 2-bit index feedback is used respectively.
  • Any code word W 2 in the second level codebook B 2 is expressed as:
  • the beam selection methods of different polarization directions and different layers should be considered according to the structure of the first-stage codebook.
  • the following are several schemes for a second-level codebook with a rank of 2.
  • Embodiment 1.3.1 block matrix X n beam set size C is 4, the same or different DFT beams are independently selected for each polarization direction, and the same DFT beam is selected for each layer, such second stage
  • the codebook is adapted to match the first level codebook that is not redundant.
  • the number of codewords N 2 is 16, and 4-bit index feedback is used, wherein there are eight options for beam selection, 3-bit index feedback, and two options for phase offset information. Use 1-bit index feedback.
  • Any code word W 2 in the second level codebook B 2 is expressed as:
  • Embodiment 1.3.2 block matrix X n beam set size C is 4, the same or different DFT beams are independently selected for each layer, and the same DFT beam is selected for each polarization direction, such second stage
  • the codebook is adapted to match the first level codebook that is not redundant.
  • the number of codewords N 2 is 16, and 4-bit index feedback is used, wherein there are eight options for beam selection, 3-bit index feedback, and two options for phase offset information. Use 1-bit index feedback.
  • Any code word W 2 in the second level codebook B 2 is expressed as:
  • block matrix X n beam set has a size C of 4, and the same or different DFT beams are independently selected for each polarization direction and layer, such second-level codebook is suitable and redundant
  • the first level codebook is matched, and the block matrix tantrex should include orthogonal DFT beams.
  • the number of codewords corresponding to the second-level codebook with rank 2 is 16 and the 4-bit index feedback is used.
  • Any code word W 2 in the second-level codebook B 2 is expressed as: 4_
  • Embodiment 1.3.4 Block Matrix
  • the size of the X n beam set C is 4, and the same or different DFT beams are independently selected for each polarization direction, and the same DFT beam is selected for each layer, such a second stage
  • the codebook is adapted to match the first level codebook with redundancy.
  • the number of codewords N 2 is 8, and 3-bit index feedback is used.
  • the phase offset information has two options. Use 1-bit index feedback.
  • Any code word W 2 in the second level codebook B 2 is expressed as:
  • the size C of the beam set in the block matrix X n is 4, and the same or different DFT beams are independently selected for each layer, and the same DFT beam is selected for each polarization direction, such a second
  • the level codebook is adapted to match the first level codebook with redundancy.
  • the number of codewords N 2 is 8, and 3-bit index feedback is used.
  • the phase offset information has two options. Use 1-bit index feedback.
  • Any code word W 2 in the second level codebook B 2 is expressed as:
  • the size of the beam set C in the block matrix 11 is 4, the same DFT beam is selected for each polarization direction, and the same DFT beam is selected for each layer, such a second level codebook is suitable for Matches the first level codebook ⁇ without redundancy.
  • the number of codewords N 2 is 8, and 3-bit index feedback is used.
  • the phase offset information has two options. Use 1 bit index feedback.
  • Any code word W 2 in the second level codebook B 2 is expressed as:
  • block matrix X n beam set has a size C of 2, independently selecting the same or different DFT beams for each polarization direction, and independently selecting the same or different DFT beams for each layer, such that a second stage codebook is suitable to match that is not redundant first level codebook B, X n block matrix should include orthogonal DFT beams.
  • the number of codewords N 2 is 16, and 4-bit index feedback is used. There are eight options for beam selection, 3-bit index feedback, and two options for phase offset information. Use 1-bit index feedback. Any code word W 2 in the second level codebook B 2 is expressed as:
  • the size of the block matrix X n beam set C is 2, the same or different DFT beams are independently selected for each polarization direction, and the same DFT beam is selected for each layer, such a second stage
  • the codebook is adapted to match the first level codebook without redundancy.
  • the number of codewords N 2 is 8, and 3-bit index feedback is used.
  • the phase offset information has two options. Use 1-bit index feedback.
  • Any code word W 2 in the second level codebook B 2 is expressed as:
  • Embodiment 1.3.9 block matrix X n beam set size C is 2, the same or different DFT beams are independently selected for each layer, and the same DFT beam is selected for each polarization direction, such second stage
  • the codebook is adapted to match the first level codebook without redundancy.
  • the number of codewords N 2 is 8, and 3-bit index feedback is used.
  • the phase offset information has two options. Use 1-bit index feedback.
  • Any code word W 2 in the second level codebook B 2 is expressed as:
  • the codebooks of rank 3 and rank 4 use the same first-level codebook B, and the following are several alternative codebook schemes.
  • Embodiment 1.4.1 The first-level codebook for rank 1 or rank 2 is still applicable to the first-level codebook with rank 3 or rank 4. It is applicable not only to beam granularity ( ⁇ is 16, but also applicable). The beam granularity ( ⁇ is 32. 4-bit index feedback is still used.
  • a first-level codebook suitable for rank 3 or rank 4 is a subset selected from a first-level codebook suitable for rank 1 or rank 2, for example from embodiment 1.1
  • the first level codebook of .1 is selected.
  • the beam set includes adjacent and orthogonal DFT beams.
  • the beam spacing between adjacent beams is 2 ⁇ /16 and the orthogonal beam spacing is 71. Without overlapping DFT beams, the first level codebook is not redundant.
  • Any codeword ⁇ is expressed as:
  • a first-level codebook suitable for rank 3 or rank 4 is a subset selected from a first-level codebook suitable for rank 1 or rank 2, for example from embodiment 1.1
  • the first level codebook of .2 is selected.
  • the beam set includes adjacent
  • any codeword ⁇ is expressed as:
  • the first-level codebook applicable to rank 3 or rank 4 is redesigned, and is different from the first-level codebook applicable to rank 1 or rank 2.
  • the beam set includes adjacent and orthogonal DFT beams.
  • the beam spacing between adjacent beams is 2 ⁇ /8 and the orthogonal beam spacing is 71. Two of the two adjacent codewords overlap, and there are no duplicated codewords in 8.
  • Such a first level codebook is not redundant. Any codeword ⁇ is expressed as:
  • Embodiment 1.5.1 corresponds to the design of the second level codebook ⁇ 2 of rank 3.
  • the block matrix X n beam set has a size C of 4, and the same or different DFT beams are independently selected for each polarization direction. Orthogonal DFT beams should be included in the block matrix X n .
  • the number of codewords in the second-level codebook is N 2 of 16, using 4-bit index feedback, where beam selection There are 16 options using 4-bit feedback, and the phase offset information has only one option.
  • Any code word W 2 in the second level codebook B 2 is expressed as:
  • Embodiment 1.5.2 corresponds to the design of the second level codebook B 2 of rank 3.
  • the block matrix X n beam set has a size C of 4, and the same DFT beam is selected for each polarization direction.
  • the block matrix X n should include orthogonal DFT beams.
  • the number of codewords N 2 in the second-level codebook is 8, and 3-bit index feedback is used. There are eight options for beam selection, and 3-bit feedback.
  • the phase offset information has only one option. Any code word W 2 in the second level codebook B 2 is expressed as:
  • Embodiment 1.6.1 corresponds to the design of the second level codebook B 2 of rank 4.
  • the block matrix X n beam set has a size C of 4, and the same or different DFT beams are independently selected for each polarization direction. Orthogonal DFT beams should be included in the block matrix X n .
  • the number of codewords in the second-level codebook N 2 is 8, and 3-bit index feedback is used. There are four options for beam selection, 2-bit feedback, and two options for phase offset information. Any code word W 2 in the second level codebook B 2 is expressed as:
  • the configurations of the complete first level codebook or the complete second level codebook in the above embodiments 1.1.1 to 1.6.1 are exemplary. Not limited.
  • the above technical solution introduces orthogonal DFT (Discrete Fourier Transform) beam selection in the two-stage codebook index feedback, which is more suitable for the MIMO application of the cross-polarized 4 downlink transmit antenna configuration.
  • orthogonal DFT Discrete Fourier Transform
  • the above embodiments 1.1.1 to 1.6.1 are equally applicable to MIMO applications of a linear array of transmit antenna configurations.
  • the 8-antenna codebook extraction rule suitable for ranks 1, 2, 3, 4 in Table 7.2.2-1E of 3GPP document TS 36.213 can be used for 4 antennas. Codebook extraction.
  • Embodiment 2.1.1 corresponds to codebook extraction when the rank is 1 or 2. 3 compresses the first codeword bit feedback, the second codeword W 2 is a 1-bit feedback compression. Complete first level codebook B.
  • Embodiment 1.1.1 Construction extracting codewords with partial DFT beam overlap between them, such that any codewords used for index feedback or DFT beams are completely different or DFT beams are identical. Any codeword is expressed as:
  • the complete second-level codebook B 2 is constructed as in embodiment 1.2.1, extracted to remove different DFT beam selections in different polarization directions, such that the beam selection is limited to, and the phase offset information is limited to The offset angle is either 0 or ⁇ .
  • Any codeword W is shown as:
  • the complete second-level codebook B 2 is constructed as in embodiment 1.3.3, and the extraction of the second-level codebook B 2 gives the following four schemes.
  • Second-stage codebook B 2 decimated to remove between different polarization directions, different DFT beam selection between the different layers, and wherein the selection is limited to the beam.
  • the phase offset information maintains two options. Any code word W 2 is expressed as:
  • Embodiment 2.1.2 corresponds to codebook extraction when the rank is 1 or 2.
  • the first codeword is 2 bits feedback compression
  • the compressed second codeword W 2 is a 2-bit feedback.
  • Embodiment 1.1.1 Construction extracting codewords with partial DFT beam overlap between each other and completely repeated codewords, such that the DFT beams between any codewords used for index feedback are completely different. Any codeword is expressed as:
  • the complete second-level codebook ⁇ 2 is constructed as in Embodiment 1.2.1, and the extraction of the second-level codebook ⁇ 2 gives the following two schemes.
  • Scheme A second-stage codebook B 2 wherein decimated so that the selection is limited to the beam, information is limited to the phase shift of 0 or ⁇ offset angle both options, the beam selection and hold different between different polarization directions.
  • Any code word W 2 is expressed as:
  • the second stage codebook B 2 decimated DFT beam is selected to remove different between different polarization directions, and wherein the selection is limited to the beam, and the phase shift information holding offset angle is 0, ⁇ / 2, ⁇ , 3 ⁇ /2 four options.
  • Any code word W 2 is expressed as:
  • the complete second-level codebook B 2 is constructed as in embodiment 1.3.3, and the extraction of the second-level codebook B 2 gives the following three schemes.
  • Second-stage codebook B 2 decimated DFT beam to remove different selection between different layers, and wherein the selection is limited to the beam, the phase shift information holding two options.
  • Any code word W 2 is expressed as:
  • the second stage codebook B 2 decimated DFT beam is selected to remove different between different polarization directions, and wherein the selection is limited to the beam, the phase shift information holding two options.
  • Any code word W 2 is expressed as:
  • the second stage codebook B 2 decimated phase offset information so that only one option remains between different polarization directions, different DFT beam selection between the different layers.
  • Any code word W 2 is expressed as:
  • Embodiment 2.2.1 corresponds to codebook extraction when the rank is 3 or 4.
  • the first codeword is a bit feedback compression, a second compression code word W 2 three-bit feedback.
  • the first level codebook is constructed as in Embodiment 1.4.2.
  • the DFT beam granularity is reduced by decimation such that n can only take a value of 0 or 4. Any codeword is expressed as:
  • the complete second-level codebook B 2 is constructed as in embodiment 1.5.1, and the extraction of the second-level codebook B 2 gives the following two schemes.
  • the second level codebook ⁇ 2 is decimate to remove different DFT beam selections between different polarization directions, while maintaining four column selections.
  • Any code word W 2 is expressed as: 3 ⁇ 4]) (3 ⁇ 4 [3 ⁇ 4 3 ⁇ 4]) (3 ⁇ 4 3 ⁇ 4]) (3 ⁇ 4 [3 ⁇ 4 3 ⁇ 4])
  • the second-level codebook B 2 is not extracted, and any codeword W 2 is expressed as:
  • Embodiment 2.2.2 corresponds to codebook extraction when the rank is 3 or 4.
  • the first codeword is 2 bits feedback compression
  • the compressed second codeword W 2 is a 2-bit feedback.
  • the first level codebook is constructed as in Embodiment 1.4.2, and no extraction is performed, that is, we ⁇ 0, 2, 4, 6 ⁇ . Any codeword ⁇ is expressed as:
  • the second level codebook B 2 is extracted such that the phase offset information is only one option and remains unchanged Different beam selection between the same polarization directions.
  • Any code word w 2 is expressed as
  • the decimation scheme of the second-level codebook B 2 in embodiment 2.2.2 is also suitable for the PUCCH 2- 1 mode.
  • the decimation scheme of the second-level codebook B 2 in embodiment 2.1.2 is also suitable for the PUCCH 2-1 mode. Several options are given below.
  • Second level codebook B 2 decimated to remove between different polarization directions, different DFT beam selection between the different layers, and wherein the selection is limited to the beam, and the phase shift information holding two options.
  • Any code word W 2 in the second level codebook B 2 is expressed as: The above scheme introduces a suitable codebook extraction in the 4-antenna downlink channel two-level codebook index feedback, which is suitable for codebook reuse in the case of limited feedback overhead.

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Abstract

La présente invention concerne un procédé et un appareil de retour d'informations de livre de codes pour l'extraction de canaux multi-antenne dans un système MIMO (entrées multiples, sorties multiples). Dans un mode de réalisation de la présente invention, un procédé (20) comprend : (21) détecter un canal multi-antenne de liaison descendante; (22) déterminer un premier mot de code correspondant à un livre de codes d'extraction de premier niveau avec un rang R; (23) renvoyer un index du premier mot de code; (24) déterminer un deuxième mot de code correspondant à un livre de codes d'extraction de deuxième niveau avec le rang R; et (25) renvoyer un index du deuxième mot de code. Dans la solution ci-décrite, une extraction adéquate de livre de codes est introduite dans un renvoi d'index de livre de codes à deux niveaux dans un canal de liaison descendante 4 antennes.
PCT/CN2013/000557 2013-05-10 2013-05-10 Procédé et appareil de retour d'informations de livre de codes pour l'extraction de canaux multi-antenne dans un système mimo Ceased WO2014179902A1 (fr)

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PCT/CN2013/000557 WO2014179902A1 (fr) 2013-05-10 2013-05-10 Procédé et appareil de retour d'informations de livre de codes pour l'extraction de canaux multi-antenne dans un système mimo
PCT/CN2013/000681 WO2014179903A1 (fr) 2013-05-10 2013-06-07 Procédé et appareil de rétroaction de livre de codes d'extraction de canal à antennes multiples dans un système mimo
CN201380042419.7A CN104541470B (zh) 2013-05-10 2013-06-07 Mimo系统中的多天线信道抽取码本反馈方法及装置

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PCT/CN2013/000681 Ceased WO2014179903A1 (fr) 2013-05-10 2013-06-07 Procédé et appareil de rétroaction de livre de codes d'extraction de canal à antennes multiples dans un système mimo

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CN101867461A (zh) * 2010-04-30 2010-10-20 中兴通讯股份有限公司 信道信息获取方法及装置、码本构造方法
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EP2536057A1 (fr) * 2010-04-05 2012-12-19 ZTE Corporation Procédé et système pour réaction des informations d'état de canal
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CN101388699A (zh) * 2007-09-12 2009-03-18 夏普株式会社 基于空时频域的信息反馈方法和系统、用户设备及基站
KR101276855B1 (ko) * 2010-03-08 2013-06-18 엘지전자 주식회사 프리코딩 행렬 정보 전송방법 및 사용자기기와, 프리코딩 행렬 구성방법 및 기지국

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EP2536057A1 (fr) * 2010-04-05 2012-12-19 ZTE Corporation Procédé et système pour réaction des informations d'état de canal
CN101867461A (zh) * 2010-04-30 2010-10-20 中兴通讯股份有限公司 信道信息获取方法及装置、码本构造方法
CN102299775A (zh) * 2010-06-24 2011-12-28 上海贝尔股份有限公司 一种预编码矩阵的选择方法和装置
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