WO2011109933A1 - 多输入多输出无线通信系统中反馈信道信息的方法和装置 - Google Patents
多输入多输出无线通信系统中反馈信道信息的方法和装置 Download PDFInfo
- Publication number
- WO2011109933A1 WO2011109933A1 PCT/CN2010/070926 CN2010070926W WO2011109933A1 WO 2011109933 A1 WO2011109933 A1 WO 2011109933A1 CN 2010070926 W CN2010070926 W CN 2010070926W WO 2011109933 A1 WO2011109933 A1 WO 2011109933A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- modulation
- information
- precoding matrix
- matrix index
- coding
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
-
- 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
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/007—Unequal error protection
Definitions
- the present invention relates to multiple input multiple output (MIMO) wireless communication systems, and more particularly to a method and apparatus for feedback channel information in a multi-input multiple output wireless communication system.
- MIMO multiple input multiple output
- channel information such as Channel State Information (CSI), Channel Quality Information (CQI), and the like are critical.
- CSI Channel State Information
- CQI Channel Quality Information
- the more accurate the channel information that is fed back from the receiving device to the transmitting device the more system performance gains it brings, but it will also cost more feedback overhead.
- the feedback schemes for channel information such as precoding matrix index, channel quality information, and channel covariance matrix are as follows:
- the precoding matrix index differential feedback method is an effective method for reducing the precoding matrix index feedback overhead.
- the receiving device feeds back the basic precoding matrix index, and for the remaining radio resources highly correlated with the radio resource, The receiving device then feeds back the differential precoding matrix index, that is, the precoding matrix index offset.
- the same transmission quality of service is used for both the basic precoding matrix index and the differential precoding matrix index (Transmission) QoS), such as the same block error rate and the same transmission delay protection.
- the importance levels of the basic precoding matrix index and the differential precoding matrix index are different, that is, the importance level of the basic precoding matrix index is much higher than the differential precoding matrix index, the above precoding matrix index differential feedback mode Not a better way to feedback.
- the channel quality information differential feedback method is also an effective method for reducing the feedback cost of the channel shield information. Similar to the precoding matrix index differential feedback method, in the channel quality information differential feedback mode, the same transmission quality of service (Transmission QoS) is used for both basic channel quality information and differential channel quality information, for example, the same block error rate and Same transmission delay protection. However, since the importance level of the basic channel quality information and the differential channel quality information is different, that is, the importance level of the basic channel quality information is much higher than the differential channel quality information, the above channel quality information differential feedback method is not a Excellent feedback method.
- Transmission QoS Transmission QoS
- the channel covariance matrix is also a type of channel information that enhances the performance of the transmitting device by using long-term beamforming or a transform codebook based on the channel covariance matrix.
- a commonly used channel covariance matrix feedback method uses the same forward error correction protection and the same transmission delay protection for both diagonal elements and off-diagonal elements in the channel covariance matrix.
- the importance levels of the diagonal elements and the non-diagonal elements in the channel covariance matrix are different, that is, the importance level of the diagonal elements is much higher than that of the non-diagonal elements, the above channel covariance Matrix feedback is not a better feedback method.
- the present invention provides, in an embodiment, a method for feeding back channel information to a transmitting device in a receiving device of a multiple input multiple output wireless communication system, wherein the method comprises the following steps: a. Determining the importance level of each part of the information in the channel information, and selecting different modulation and coding modes for the pieces of information, wherein the robustness of the modulation and coding mode selected for the pieces of information and the importance of the pieces of information The level is proportional to; b. according to the modulation and coding method selected in step a, each part of the channel information is modulated and encoded, and then sent to the transmitting device.
- the method further includes the following steps: m.
- step b further comprises: passing the part of the modulated and encoded information to the physical channel feedback selected in step m To the transmitting device.
- the channel information includes a precoding matrix index, or channel quality information, or a channel covariance matrix.
- the channel information is a precoding matrix index
- the step a further includes: selecting a first modulation and coding mode for the basic precoding matrix index in the precoding matrix index, and indexing the precoding matrix
- the second pre-coding matrix index is selected in the second modulation coding mode, wherein the first modulation coding mode is stronger than the second modulation coding mode
- the step b includes: The basic precoding matrix index in the precoding matrix index is subjected to modulation and coding processing, and then sent to the transmitting device, and the differential precoding matrix index in the precoding matrix index is modulated and encoded according to the second modulation and coding manner. Send to the sending device.
- the method further includes the following steps: X. selecting, by using a basic precoding matrix index in the precoding matrix index, a physical control channel for transmission, and indexing the differential precoding matrix in the precoding matrix index. Selecting a physical shared channel for transmission; where the step b further includes: transmitting, by using the physical control channel, the basic precoding matrix index subjected to the modulation and coding process to the transmitting device, and the difference after the modulation and coding process The precoding matrix index is sent to the transmitting device over a physical shared channel.
- the present invention provides a method for receiving channel information fed back by a receiving device in a transmitting device of a multiple input multiple output wireless communication system, wherein the method includes the following steps: A. receiving separately Each part of the channel information after being modulated and encoded by the receiving device; B. Demodulation decoding processing of the received modulated phase inverse respectively.
- the step A further includes: receiving, by using the different physical channels respectively And receiving, by the device, the partial information in the channel information after the modulation and coding process.
- the channel information is a precoding matrix index
- the step A further includes: receiving, by the receiving device, the first precoding matrix index after the first modulation and coding process and after the second modulation and coding process a differential precoding matrix index, wherein the strength of the first modulation and coding process is better than the second modulation and coding process; wherein the step B further comprises: performing basic processing on the received first modulation coding process
- the precoding matrix index performs demodulation decoding processing inverse to the first modulation encoding process, and performs processing on the received second modulation encoding processed differential precoding matrix index with the second modulation encoding process Inverse demodulation decoding processing.
- the step A further includes: receiving, by using the first modulation coding, a basic precoding matrix index that is fed back by the receiving device on a physical control channel, and receiving, by the receiving device, on a physical shared channel.
- the differential precoding matrix index after the second modulation encoding process is fed back.
- the present invention provides, in an embodiment, a feedback device for feeding back channel information to a transmitting device in a receiving device of a multiple input multiple output wireless communication system
- the feedback device comprises: a first selecting device, configured to: Determining, according to the importance level of each part of the information in the channel information, a different modulation and coding mode for each part of the information, where the robustness of the modulation and coding mode selected for the part of the information and the information of each part of the information
- the importance level is proportional to;
- the modulation and coding device is configured to perform modulation and coding processing on each part of the channel information according to the modulation and coding mode selected by the first selection device, and then send the information to the transmitting device.
- the feedback device further includes: a second selecting device, configured to select, according to the importance level of each part of the information in the channel information, different physical channels for the part information to be transmitted, where The transmission delay tolerance of the physical channel selected by each part of the information is inversely proportional to the importance of the pieces of information; wherein the modulation and coding apparatus is further configured to: pass the part of the information after the modulation and coding process through the The physical channel selected in the two selection devices is fed back to the transmitting device.
- a second selecting device configured to select, according to the importance level of each part of the information in the channel information, different physical channels for the part information to be transmitted, where The transmission delay tolerance of the physical channel selected by each part of the information is inversely proportional to the importance of the pieces of information
- the modulation and coding apparatus is further configured to: pass the part of the information after the modulation and coding process through the The physical channel selected in the two selection devices is fed back to the transmitting device.
- the channel information is a precoding matrix index
- the first selecting means is configured to: select, according to a basic precoding matrix index in the precoding matrix index, a first modulation coding side And selecting a second modulation and coding scheme for the differential precoding matrix index in the precoding matrix index, where the strength of the first modulation and coding scheme is better than the second modulation and coding scheme;
- the device is configured to: perform modulation and coding processing on a basic precoding matrix index in the precoding matrix index according to a first modulation and coding manner, and then send the data to the sending device, and index the precoding matrix according to a second modulation and coding manner.
- the differential precoding matrix index is subjected to modulation and coding processing and then transmitted to the transmitting device.
- the present invention provides a processing apparatus for receiving channel information fed back by a receiving device in a transmitting device of a multiple input multiple output wireless communication system, wherein the processing device includes: a receiving device, And respectively receiving each part of the channel information processed by the modulation and processing by the receiving device; and demodulating and decoding means, respectively, for respectively performing the received part of the modulated and encoded information
- the modulation and coding process performed by the receiving device end is inversely demodulated and decoded.
- the receiving device is further configured to: receive, according to different physical channels, respective pieces of information in the channel information that is modulated and encoded by the receiving device, respectively.
- FIG. 1 shows a system block diagram of a multiple input multiple output wireless communication system in accordance with one embodiment of the present invention
- FIG. 2 is a flow chart showing a method for feeding back channel information to a transmitting device in a receiving device of a multiple input multiple output wireless communication system according to an embodiment of the present invention
- FIG. 3 is a flow chart showing a method for receiving channel information fed back by a receiving device in a transmitting device of a multiple input multiple output wireless communication system according to an embodiment of the present invention
- FIG. 4 is a schematic diagram showing a codebook construction scheme of a precoding matrix index differential feedback method according to an embodiment of the present invention
- Figure 5 is a graph showing a cumulative distribution function curve of instantaneous channel capacity for an embodiment of the present invention
- 6 shows an average channel capacity-signal-to-noise ratio curve according to an embodiment of the present invention
- FIG. 7 shows an embodiment of the present invention for use in a receiving device of a multiple input multiple output wireless communication system.
- Fig. 8 is a block diagram showing the construction of a processing apparatus for receiving channel information fed back by a receiving apparatus in a transmitting apparatus of a multiple input multiple output wireless communication system according to an embodiment of the present invention.
- the transmitting device 20 transmits data to the receiving device 10, and the receiving device 10 feeds back channel information to the transmitting device 20.
- the transmitting device 20 may be a base station or an evolved NodeB (eNodeB)
- the receiving device 10 may be a user equipment
- the sending device 20 may be a user equipment
- the receiving device 10 may be a base station or an evolved NodeB.
- FIG. 2 is a flow chart showing a method for feeding back channel information to a transmitting device in a receiving device of a multiple input multiple output wireless communication system according to an embodiment of the present invention.
- step S11 the receiving device 10 selects a different modulation and coding scheme for reading each piece of information based on the importance level of each piece of information in the channel information.
- the robustness of the modulation and coding scheme selected by the receiving device 10 for each of the partial information is proportional to the importance level of the respective portions of information. That is, the higher the importance level, the stronger the modulation coding mode chosen for it.
- step S12 the receiving device 10 performs modulation and coding processing on each partial information according to the modulation and coding scheme selected for each partial information in the above-described step S11, and feeds back the information of each part after the modulation and encoding process.
- the receiving device 10 further selects a different physical channel for the partial information to transmit according to the importance level of each part of the information in the channel information.
- the transmission delay tolerance of the physical channel selected by the receiving device 10 for each part of the information is inversely proportional to the importance of the pieces of information. That is, the higher the importance level, the lower the transmission delay tolerance of the physical channel selected for it.
- the receiving device 10 feeds back the partial information subjected to the modulation and encoding processing to the transmitting device 20 through the physical channel selected for reading the respective pieces of information.
- the channel information fed back by the receiving device 10 to the transmitting device 20 includes but is not limited to a Precoding Matrix Index, Channel Quality Information, Channel Co variance matrix, "3 GPP Rl- 091455, Qualcomm, Hierarchical feedback in support of downlink CoMP operation" Hierarchical Feedback, Transform-based feedback compression (3GPP Rl-092032, ALU, CQI and CSI Feedback Compression) Feedback Compression) and so on.
- Figure 3 illustrates a method for receiving channel information fed back by a receiving device in a transmitting device of a multiple input multiple output wireless communication system in accordance with one embodiment of the present invention.
- step S21 the transmitting device 20 receives the respective pieces of information in the channel information after the modulation and encoding processing fed back by the receiving device 10, respectively.
- the transmitting device 20 receives the modulated encoding processing fed back by the receiving device 10 on different physical channels, respectively. Each part of the information in the channel information.
- step S22 the transmitting device 20 performs demodulation decoding processing inverse to the modulation encoding processing performed by the receiving device 10 on each of the received modulated encoded partial information.
- the channel information received by the receiving device 10 and fed back by the receiving device 10 includes, but is not limited to, a Precoding Matrix Index, a channel quality information, and a channel co variance matrix.
- a Precoding Matrix Index a Precoding Matrix Index
- a channel quality information a channel quality information
- a channel co variance matrix a Precoding Matrix Index
- channel information feedback scheme according to an embodiment of the present invention will be described below by taking channel information as a precoding matrix index as an example. It will be understood by those skilled in the art that the channel information feedback scheme of the present invention is equally applicable to the case where the channel information is channel quality information or a channel covariance matrix or the like.
- precoding matrix index difference feedback is usually adopted to reduce feedback overhead.
- the receiving device 10 feeds back the precoding matrix index information to the transmitting device 20 in a precoding matrix index differential feedback manner as an example.
- each codeword in the codebook has a set of codeword subsets that are highly correlated with it)
- the codeword subset index of codeword 1 is ⁇ 1,5,6,8,10,11,14,16 ⁇
- the codeword subset index of codeword 2 is ⁇ 2,5, 7,8,9,12,15,16 ⁇ .
- these codeword subset indexes should also be stored on the transmitting device 20 and the receiving device 10 side, respectively.
- the receiving device 10 first selects one radio resource block (referred to as a first radio resource block) from among a plurality of radio resource blocks as a start of differential encoding. Simultaneously, The receiving device 10 also selects a plurality of radio resource blocks that are highly correlated with the first radio resource block from a plurality of radio resource blocks.
- a first radio resource block one radio resource block (referred to as a first radio resource block) from among a plurality of radio resource blocks as a start of differential encoding.
- the receiving device 10 also selects a plurality of radio resource blocks that are highly correlated with the first radio resource block from a plurality of radio resource blocks.
- the receiving device 10 first predicts channel state information (CSI) on the first radio resource block, and then, based on the predicted channel state information and based on predetermined criteria, for example, minimizing the chord distance or maximizing the signal to noise ratio (SINR)
- CSI channel state information
- SINR signal to noise ratio
- the receiving device 10 respectively predicts channel state information on a plurality of radio resource blocks highly correlated with the first radio resource block, and according to the predicted channel state information and the codeword in the basic codeword based on a predetermined criterion. Collecting, respectively, a plurality of radio resource blocks highly correlated with the read first radio resource block to find an optimal codeword, and reading the index of the codeword and the index value of the basic codeword as the first radio resource A differential precoding matrix index of a plurality of radio resource blocks whose blocks are highly correlated.
- the receiving device 10 repeats the above steps. It should be noted that, for each group of radio resource blocks, the basic codebook needs to be reset, that is, a basic codeword is reselected from the basic codebook.
- the receiving device 10 selects different modulation and coding modes for the basic precoding matrix index and the differential precoding matrix index according to the basic precoding matrix index and the importance level of the differential precoding matrix index, and according to the selected modulation and coding mode,
- the basic precoding matrix index and the differential precoding matrix index are respectively subjected to modulation and coding processing and then fed back to the transmitting device 20.
- the receiving device 10 selects a stronger coding coding mode for the basic precoding matrix index, such as QPSK+1/4 Turbo coding;
- the differential precoding matrix index selects a modulation coding scheme with lower robustness but higher spectral efficiency, such as QPSK+3/4 Turbo coding, or 16QAM+1/2 Turbo coding.
- the receiving device 10 also selects different physical channels for transmission based on the basic precoding matrix index and the importance level of the differential precoding matrix index for the basic precoding matrix index and the differential precoding matrix index.
- the receiving device 10 selects a physical channel with a small transmission delay, such as a physical uplink control channel (PUCCH), for the basic precoding matrix index after the modulation and coding process; for the modulated encoding process,
- a physical channel with a small transmission delay such as a physical uplink control channel (PUCCH)
- PUCCH physical uplink control channel
- the differential precoding is transmitted on a large physical channel, such as a Physical Uplink Shared Channel (PUSCH).
- PUSCH Physical Uplink Shared Channel
- the transmitting device 20 receives the modulated precoding matrix index and the differential precoding matrix index fed back by the receiving device 10 on different physical channels, for example, receiving the receiving device on the physical uplink control channel (PUCCH).
- 10 the feedback-coded basic precoding matrix index of the feedback and the differential precoding matrix index after receiving the modulated encoding process fed back by the receiving device 10 on the physical uplink shared channel (PUSCH),
- the QPSK+1/4 Turbo coding processed basic precoding matrix index performs demodulation decoding processing inverse to the modulation encoding process to obtain a basic precoding matrix index
- a modulated encoding process such as QPSK+3/4
- the turbo pre-coded differential precoding matrix index performs demodulation decoding processing inverse to the modulation encoding process to obtain a differential precoding matrix index.
- the sending device 20 searches for the corresponding codeword from the basic codebook according to the obtained basic precoding matrix index, and searches for the corresponding code in the codeword subset of the codeword according to the obtained differential precoding matrix index. word.
- the found code words i.e., precoding matrices, are used to precode the data transmitted on the corresponding radio resource block, for example, single user precoding processing, or multi-user precoding processing.
- the transmitting device 20 repeats the above steps.
- the pre-coding process of the data to be transmitted by the transmitting device 20 according to the pre-coding matrix and the processing of the data to be transmitted before and after the pre-encoding process may use the processing methods existing in the prior art, for the sake of brevity. , I will not repeat them here.
- a better performance gain can be achieved by using a channel information feedback scheme in accordance with one embodiment of the present invention.
- a more robust modulation coding scheme corresponds to a smaller error probability a.
- Channel information feedback scheme, " 0.1.
- the error probability of the basic precoding matrix index is "0.01", and the remaining 7 differential precoding matrices
- Figure 5 shows a cumulative distribution function curve for instantaneous channel capacity.
- the two curves in the figure are the cumulative distribution function curves of the precoding matrix index differential feedback method using the same error protection mechanism under the real transmission error model, and the precoding matrix using different error protection mechanisms under the real transmission error model.
- Bow] The cumulative distribution function curve of the differential feedback method.
- Figure 6 shows the average channel capacity - signal to noise ratio curve.
- the two curves in the figure are the average channel capacity-signal-to-noise ratio curves of the precoding matrix index differential feedback method using the same error protection mechanism under the real transmission error model, and the different error protection mechanisms under the real transmission error model.
- the signal-to-noise ratio gain of the average ldB can be obtained using different error protection mechanisms at the same average channel capacity compared to using the same error protection mechanism.
- Fig. 7 is a block diagram showing the structure of a feedback device for feeding back channel information to a transmitting device in a receiving device of a multiple input multiple output wireless communication system according to an embodiment of the present invention.
- the feedback device 100 includes a first selection device 1001 and a modulation and coding device 1002.
- the first selection means 1001 of the feedback means 100 in the receiving device 10 selects a different modulation and coding mode for the pieces of information based on the importance level of each piece of information in the channel information.
- the robustness of the modulation and coding mode selected by the first selection means 1001 for each piece of information is proportional to the importance level of the information of each part of the read. That is, the higher the importance level, the stronger the modulation coding method chosen for it.
- the modulation and coding apparatus 1002 in the feedback apparatus 100 performs modulation and coding processing on each part of the information according to the modulation and coding scheme selected by the first selection apparatus 1001 for each part of the information, and performs each of the modulated and encoded processes. Part of the information is fed back to the transmitting device 20.
- the second selection device in the feedback device 100 also selects different physics for reading the partial information according to the importance level of each part of the information in the channel information.
- the channel is transmitted.
- the transmission delay tolerance of the physical channel selected by the second selection means for each part of the information is inversely proportional to the importance of each part of the information. That is, the higher the importance level, the lower the transmission delay tolerance of the physical channel selected for it.
- the modulation and coding apparatus 1002 feeds back the pieces of information subjected to the modulation and coding processing to the transmission device 20 through the physical channel selected for the information of each part.
- the channel information fed back by the receiving device 10 to the transmitting device 20 includes but is not limited to a Precoding Matrix Index, Channel Quality Information, Channel Covariance Matrix, "3 GPP Rl-091455 , Qualcomm , Hierarchical feedback in support of downlink CoMP operation,, Hierarchical Feedback, Transform-based Feedback Compression, etc., referred to in "3GPP Rl-092032, ALU, CQI and CSI Feedback Compression".
- Fig. 8 is a block diagram showing the construction of a processing apparatus for receiving channel information fed back by a receiving apparatus in a transmitting apparatus of a multiple input multiple output wireless communication system according to an embodiment of the present invention.
- the processing device 200 includes a receiving device 2001 and a demodulation decoding device 2002.
- the receiving device 2001 in the processing device 200 in the transmitting device 20 receives the respective pieces of information in the modulated encoded channel information fed back by the receiving device 10, respectively.
- the receiving device 2001 receives the modulated encoding processing fed back by the receiving device 10 on different physical channels, respectively. Each part of the information in the channel information.
- the demodulation and decoding means 2002 in the processing device 200 respectively performs demodulation and decoding processing on the respective pieces of the modulated coded processed portion, which are inverse to the modulation and coding process performed by the receiving device 10 side.
- the channel information received by the receiving device 10 and fed back by the receiving device 10 includes, but is not limited to, a Precoding Matrix Index, Channel Quality Information, Channel Co variance matrix, "3" LTE Rl-091455, Qualcomm, Hierarchical feedback in support of downlink CoMP operation", Hierarchical Feedback, "3GPP Rl-092032, ALU, CQI and CSI Feedback Compression” Transform-based Feedback Compression and so on.
- channel information feedback scheme according to an embodiment of the present invention will be described below by taking channel information as a precoding matrix index as an example. It will be understood by those skilled in the art that the channel information feedback scheme of the present invention is equally applicable to the case where the channel information is channel quality information or a channel covariance matrix or the like.
- the precoding matrix index difference is usually used.
- Sub-feedback mode to reduce feedback overhead.
- the receiving device 10 feeds back the precoding matrix index information to the transmitting device 20 in a precoding matrix index differential feedback manner as an example.
- each codeword in the codebook has a set of codewords that are highly correlated with it to construct a differential codebook.
- the codeword subset index of codeword 1 is ⁇ 1, 5, 6, 8, 10, 11, 14, 16 ⁇
- the codeword subset index of codeword 2 is ⁇ 2, 5, 7, 8, 9 , 12, 15, 16 ⁇ .
- these codeword subset indexes should also be stored on the transmitting device 20 and the receiving device 10 side, respectively.
- the receiving device 10 first selects one radio resource block (referred to as a first radio resource block) from among a plurality of radio resource blocks as a start of differential encoding. At the same time, the receiving device 10 further selects, from the plurality of radio resource blocks, a plurality of radio resource blocks that are highly correlated with the first radio resource block.
- a first radio resource block one radio resource block (referred to as a first radio resource block) from among a plurality of radio resource blocks as a start of differential encoding.
- the receiving device 10 further selects, from the plurality of radio resource blocks, a plurality of radio resource blocks that are highly correlated with the first radio resource block.
- the receiving device 10 first predicts channel state information (CSI) on the first radio resource block, and then, based on the predicted channel state information and based on predetermined criteria, for example, minimizing the chord distance or maximizing the signal to noise ratio (SIN)
- the basic codebook selects one codeword (referred to as a basic codeword) for the first radio resource block, and uses the index of the basic codeword as the basic precoding matrix index.
- the receiving device 10 respectively predicts channel state information on a plurality of radio resource blocks highly correlated with the first radio resource block, and according to the predicted channel state information and the codeword in the basic codeword based on a predetermined criterion. Locating a plurality of radio resource blocks highly correlated with the first radio resource block to find an optimal codeword, and indexing and basic code of the codewords The offset value of the index of the word is used as a differential precoding matrix index of a plurality of radio resource blocks highly correlated with the first radio resource block.
- the receiving device 10 repeats the above functions. It should be noted that, for each group of radio resource blocks, the basic codebook needs to be reset, that is, a basic codeword is reselected from the basic codebook.
- the first selecting means 1001 in the feedback device 100 in the receiving device 10 selects different modulations for the basic precoding matrix index and the differential precoding matrix index according to the basic precoding matrix index and the importance level of the differential precoding matrix index.
- the modulation and coding apparatus 1002 in the feedback apparatus 100 performs modulation coding processing on the basic precoding matrix index and the differential precoding matrix index, respectively, according to the selected modulation and coding scheme, and feeds back to the transmitting device 20.
- the first selecting means 1001 selects a stronger coding coding mode for the basic precoding matrix index, such as QPSK + 1/4 Turbo coding.
- a stronger coding coding mode for the basic precoding matrix index such as QPSK + 1/4 Turbo coding.
- the differential precoding matrix index choose a modulation scheme with lower robustness but higher spectral efficiency, such as QPSK+3/4 Turbo coding, or 16QAM+l/2 Turbo coding.
- the second selecting device in the feedback device 100 further selects different physical channels for the basic precoding matrix index and the differential precoding matrix index according to the basic precoding matrix index and the importance level of the differential precoding matrix index. Transfer.
- the second selecting means selects a physical channel with a small transmission delay for the basic precoding matrix index after the modulation encoding process, for example, physical uplink control.
- Channel Physical Uplink Control Channel, PUCCH
- PUCCH Physical Uplink Control Channel
- the receiving device 2001 in the processing device 200 in the transmitting device 20 respectively receives the modulated precoding matrix index and the differential precoding matrix index fed back by the receiving device 10 on different physical channels, for example, on the physical uplink.
- the demodulation decoding device 2002 in the processing device 200 processes the modulated encoding, for example, QPSK+1.
- Turbo coded basic precoding matrix index performs demodulation decoding processing inverse to the modulation encoding process to obtain a basic precoding matrix index, and after modulation encoding processing, for example, QPSK+3/4 Turbo encoding processing
- the differential precoding matrix index performs demodulation decoding processing inverse to the modulation encoding process to obtain a differential precoding matrix index.
- the transmitting device 20 searches for the corresponding codeword from the basic codebook according to the obtained basic precoding matrix index, and searches the corresponding differential codeword in the codeword subset of the codeword according to the obtained differential precoding matrix index.
- the found code words i.e., precoding matrices, are used to precode the data transmitted on the corresponding radio resource block, for example, single user precoding processing, or multi-user precoding processing.
- each of the devices in the transmitting device 20 repeats the above functions.
- the pre-coding process of the data to be transmitted by the transmitting device 20 according to the pre-coding matrix and the processing of the data to be transmitted before and after the pre-encoding process may use the processing methods existing in the prior art, for the sake of brevity. , I will not repeat them here. While the invention has been illustrated and described with reference to the particular embodiments
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
Description
多输入多输出无线通信系统中
反馈信道信息的方法和装置
技术领域
本发明涉及多输入多输出 (MIMO ) 无线通信系统, 尤其涉及多输 入多输出无线通信系统中用于反馈信道信息的方法和装置。 背景技术
在多输入多输出无线通信系统中, 信道信息例如, 信道状态信息 ( Channel State Information, CSI ), 信道质量信息 (Channel Quality Information, CQI ) 等是至关重要的。 通常, 由接收设备向发送设备反 馈的信道信息越准确, 所带来的系统性能增益则越多, 但同时也将花费 更多的反馈开销。
因此, 需要提出一种信道信息反馈方案, 其能够在信道信息反馈准 确性以及反馈开销之间取得折中, 以使得在保持性能增益的情形下将反 馈开销最小化。 发明内容
目前, 针对信道信息, 例如预编码矩阵索引、 信道质量信息和信道 协方差矩阵的反馈方案分别如下:
1 ) 差分预编码矩阵索引 (Differential Preceding Matrix Index, Differential PMI )
预编码矩阵索引差分反馈方式是用于减少预编码矩阵索引反馈开 销的一种有效的方法。 通过利用空间信道变化的连续性, 即相邻物理资 源块上的信道具有的相关性, 对于一个无线资源, 接收设备反馈基本预 编码矩阵索引, 而对于其余与该无线资源高度相关的无线资源, 接收设 备则反馈差分预编码矩阵索引, 也即预编码矩阵索引偏置量。
目前, 在预编码矩阵索引差分反馈方式中, 对于基本预编码矩阵索 引和差分预编码矩阵索引都采用相同的传输服务质量 ( Transmission
QoS ), 例如相同的误块率和相同的传输延迟保护。 但是, 由于基本预编 码矩阵索引和差分预编码矩阵索引的重要性等级不同, 也即基本预编码 矩阵索引的重要性等级远高于差分预编码矩阵索引, 因此, 上述预编码 矩阵索引差分反馈方式并不是一种较优的反馈方式。
2 ) 差分信道^"量信息 ( Differential Channel Quality Information, Differential CQI )
信道质量信息差分反馈方式也是用于减少信道盾量信息反馈开销 的一种有效的方法。 与预编码矩阵索引差分反馈方式一样, 目前, 在信 道质量信息差分反馈方式中, 对于基本信道质量信息和差分信道质量信 息都采用相同的传输服务质量( Transmission QoS ), 例如相同的误块率 和相同的传输延迟保护。 但是, 由于基本信道质量信息和差分信道质量 信息的重要性等级不同, 也即基本信道质量信息的重要性等级远高于差 分信道质量信息, 因此, 上述信道质量信息差分反馈方式并不是一种较 优的反馈方式。
3 ) 信道协方差矩阵 ( Channel co variance matrix )
信道协方差矩阵也是一种信道信息, 其通过使用长期波束赋形或者 基于信道协方差矩阵的变换码本来增强发送设备的性能。 目前, 一种常 用的信道协方差矩阵反馈方式是对该信道协方差矩阵中的对角线元素 和非对角线元素都采用相同的前向纠错保护和相同的传输延迟保护。 但 是, 由于信道协方差矩阵中的对角线元素和非对角线元素的重要性等级 不同, 也即对角线元素的重要性等級远高于非对角线元素, 因此, 上述 信道协方差矩阵反馈方式并不是一种较优的反馈方式。
基于此, 本发明在一个实施例中提出了一种在多输入多输出无线通 信系统的接收设备中用于向发送设备反馈信道信息的方法, 其中, 所述 方法包括以下步骤: a. 根据所述信道信息中各部分信息的重要性等级, 为所述各部分信息选择不同的调制编码方式, 其中, 为所述各部分信息 选择的调制编码方式的强壮性与所述各部分信息的重要性等级成正比; b. 根据步骤 a中所选择的调制编码方式,分别对所述信道信息中的各部 分信息进行调制编码处理后发送至所述发送设备。
可选的, 所述方法还包括以下步骤: m. 根据所述信道信息中各部 分信息的重要性等级, 为所述各部分信息选择不同的物理信道进行传 输, 其中, 为所述各部分信息选择的物理信道的传输延迟容忍度与所述 各部分信息的重要性成反比; 其中, 所述步骤 b还包括: 将经过调制编 码处理后的各部分信息通过步驟 m 中所选择的物理信道反馈至所述发 送设备。
可选的, 所述信道信息包括预编码矩阵索引, 或者信道质量信息, 或者信道协方差矩阵。
可选的, 所述信道信息为预编码矩阵索引, 所述步骤 a还包括: 为 所述预编码矩阵索引中的基本预编码矩阵索引选择第一调制编码方式, 以及为所述预编码矩阵索引中的差分预编码矩阵索引选择第二调制编 码方式, 其中, 所述第一调制编码方式的强壮性优于所述第二调制编码 方式; 所述步骤 b包括: 根据第一调制编码方式对所述预编码矩阵索引 中的基本预编码矩阵索引进行调制编码处理后发送至所述发送设备, 以 及根据第二调制编码方式对所述预编码矩阵索引中的差分预编码矩阵 索引进行调制编码处理后发送至所述发送设备。
可选的, 所述方法还包括以下步骤: X. 为所迷预编码矩阵索引中 的基本预编码矩阵索引选择物理控制信道进行传输, 以及为所述预编码 矩阵索引中的差分预编码矩阵索引选择物理共享信道进行传输; 其中, 所述步骤 b还包括: 将经过调制编码处理后的基本预编码矩阵索引通过 所述物理控制信道发送至所述发送设备, 以及将经过调制编码处理后的 差分预编码矩阵索引通过物理共享信道发送至所述发送设备。
本发明在另一个实施例中提出了一种在多输入多输出无线通信系 统的发送设备中用于接收由接收设备反馈的信道信息的方法, 其中, 所 述方法包括以下步驟: A. 分别接收由所述接收设备反馈的经调制编码 处理后的所述信道信息中的各部分信息; B. 分别对所接收到的经调制 理相逆的解调解码处理。
可选的, 所述步骤 A还包括: 分別在不同的物理信道上接收由所述
接收设备反馈的经调制编码处理后的所述信道信息中的各部分信息。 可选的, 所述信道信息为预编码矩阵索引, 所述步骤 A还包括: 接 收由所述接收设备反馈的经第一调制编码处理后的基本预编码矩阵索 引以及经第二调制编码处理后的差分预编码矩阵索引, 其中, 所述第一 调制编码处理的强壮性优于第二调制编码处理; 其中, 所述步骤 B还包 括: 对所接收到的经第一调制编码处理后的基本预编码矩阵索引进行与 所述第一调制编码处理相逆的解调解码处理, 以及对所接收到的经第二 调制编码处理后的差分预编码矩阵索引进行与所述第二调制编码处理 相逆的解调解码处理。
可选的, 所述步骤 A还包括: 在物理控制信道上接收由所述接收设 备反馈的经第一调制编码处理后的基本预编码矩阵索引, 以及在物理共 享信道上接收由所述接收设备反馈的经第二调制编码处理后的差分预 编码矩阵索引。
本发明在一个实施例中提出了一种在多输入多输出无线通信系统 的接收设备中用于向发送设备反馈信道信息的反馈装置, 其中, 所述反 馈装置包括: 第一选择装置, 用于根据所述信道信息中各部分信息的重 要性等级, 为所述各部分信息选择不同的调制编码方式, 其中, 为所述 各部分信息选择的调制编码方式的强壮性与所述各部分信息的重要性 等级成正比; 调制编码装置, 用于根据所述第一选择装置所选择的调制 编码方式, 分别对所述信道信息中的各部分信息进行调制编码处理后发 送至所述发送设备。
可选的, 所述反馈装置还包括: 第二选择装置, 用于根据所述信道 信息中各部分信息的重要性等级, 为所述各部分信息选择不同的物理信 道进行传输, 其中, 为所述各部分信息选择的物理信道的传输延迟容忍 度与所述各部分信息的重要性成反比;其中,所述调制编码装置还用于: 将经过调制编码处理后的各部分信息通过所述第二选择装置中所选择 的物理信道反馈至所述发送设备。
可选的,所述信道信息为预编码矩阵索引,所述第一选择装置用于: 为所述预编码矩阵索引中的基本预编码矩阵索引选择第一调制编码方
式, 以及为所述预编码矩阵索引中的差分预编码矩阵索引选择第二调制 编码方式, 其中, 所述第一调制编码方式的强壮性优于所述第二调制编 码方式; 所述调制编码装置用于: 根据第一调制编码方式对所述预编码 矩阵索引中的基本预编码矩阵索引进行调制编码处理后发送至所述发 送设备, 以及根据第二调制编码方式对所述预编码矩阵索引中的差分预 编码矩阵索引进行调制编码处理后发送至所述发送设备。
本发明在另一个实施例中提出了一种在多输入多输出无线通信系 统的发送设备中用于接收由接收设备反馈的信道信息的处理装置, 其 中, 所述处理装置包括: 接收装置, 用于分别接收由所述接收设备反馈 的经调制编码处理后的所述信道信息中的各部分信息; 解调解码装置, 用于分别对所接收到的经调制编码处理后的各部分信息进行与所述接 收设备端所进行的调制编码处理相逆的解调解码处理。
可选的, 所述接收装置还用于: 分别在不同的物理信道上接收由所 述接收设备反馈的经调制编码处理后的所述信道信息中的各部分信息。
通过使用本发明的方法和装置, 能够有效地改进多输入多输出无线 通信系统的性能。 附图说明
通过阅读以下结合附图对非限定性实施例的描述, 本发明的其它目 的、 特征和优点将变得更为明显和突出。
图 1示出了根据本发明的一个实施例的多输入多输出无线通信系 统的系统框图;
图 2示出了根据本发明的一个实施例的在多输入多输出无线通信系 统的接收设备中用于向发送设备反馈信道信息的方法流程图;
图 3示出了根椐本发明的一个实施例的多输入多输出无线通信系统 的发送设备中用于接收由接收设备反馈的信道信息的方法流程图;
图 4示出了 艮据本发明的一个实施例的预编码矩阵索引差分反馈方 式的码本构建方案示意图;
图 5示出了†艮椐本发明的一个实施例的瞬时信道容量的累积分布函 数曲线;
图 6示出了才 据本发明的一个实施例的平均信道容量-信噪比曲线; 图 7示出了才 居本发明的一个实施例的在多输入多输出无线通信系 统的接收设备中用于向发送设备反馈信道信息的反馈装置的结构框图; 以及
图 8示出了才艮据本发明的一个实施例的多输入多输出无线通信系统 的发送设备中用于接收由接收设备反馈的信道信息的处理装置的结构 框图。
其中, 相同或相似的附图标记表示相同或相似的步骤特征 /装置(模 块)。 具体实施方式
以下结合附图对本发明进行详细描述。
图 1示出了根据本发明的一个实施例的多输入多输出无线通信系 统的系统框图。 如图所示, 发送设备 20向接收设备 10发送数据, 接 收设备 10向发送设备 20反馈信道信息。 本领域技术人员应能理解, 对于下行链路,发送设备 20可以是基站或者演进型 NodeB( eNodeB ), 接收设备 10可以是用户设备; 对于上行链路, 发送设备 20可以是用 户设备, 接收设备 10可以是基站或者演进型 NodeB。
图 2示出了 ^据本发明的一个实施例的在多输入多输出无线通信系 统的接收设备中用于向发送设备反馈信道信息的方法流程图。
以下将参照图 2并结合图 1对接收设备 10向发送设备 20反馈信道 信息的方法进行描述。
首先, 在步骤 S11 中, 接收设备 10根据信道信息中各部分信息的 重要性等级, 为读各部分信息选择不同的调制编码方式。 其中, 接收设 备 10 为该各部分信息选择的调制编码方式的强壮性与该各部分信息的 重要性等级成正比。 也即, 重要性等级越高的信息, 为其选择的调制编 码方式越强壮。
其次, 在步骤 S12中, 接收设备 10根据在上述步骤 S11 中为各部 分信息所选择的调制编码方式, 分别对该各部分信息进行调制编码处 理, 并将经调制编码处理后的各部分信息反馈至发送设备 20。
在一个实施例中, 接收设备 10 还根据信道信息中各部分信息的重 要性等级, 为该各部分信息选择不同的物理信道进行传输。 其中, 接收 设备 10 为该各部分信息选择的物理信道的传输延迟容忍度与该各部分 信息的重要性成反比。 也即, 重要性等级越高的信息, 为其选择的物理 信道的传输延迟容忍度越低。
然后, 接收设备 10将经过调制编码处理后的各部分信息通过为读 各部分信息所选择的物理信道反馈至发送设备 20。
接收设备 10向发送设备 20反馈的信道信息包括但不限于预编码矩 阵索引 ( Precoding Matrix Index ) , 信道质量信息 (Channel Quality Information ) , 信道协方差矩阵 ( Channel co variance matrix ) , "3 GPP Rl- 091455, Qualcomm , Hierarchical feedback in support of downlink CoMP operation" 涉及的分等级的反馈 ( Hierarchical Feedback ), "3GPP Rl- 092032, ALU, CQI and CSI Feedback Compression"中涉及的基于转换 的反馈压缩 ( Transform-based Feedback Compression )等。
图 3示出了根据本发明的一个实施例的多输入多输出无线通信系统 的发送设备中用于接收由接收设备反馈的信道信息的方法。
以下将参照图 3并结合图 1对发送设备 20接收由接收设备 10反馈 的信道信息的方法进行描迷。
首先, 在步骤 S21中, 发送设备 20分别接收由接收设备 10反馈的 经调制编码处理后的信道信息中的各部分信息。
如果接收设备 10在不同的物理信道上反馈经调制编码处理后的各 部分信息, 那么, 在一个实施例中, 发送设备 20 分别在不同的物理信 道上接收由接收设备 10反馈的经调制编码处理后的信道信息中的各部 分信息。
然后, 在步骤 S22中, 发送设备 20分别对所接收到的经调制编码 处理后的各部分信息进行与接收设备 10 一侧所进行的调制编码处理相 逆的解调解码处理。
发送设备 20接收到的由接收设备 10反馈的信道信息包括但不限于 预编码矩阵索引 (Precoding Matrix Index ), 信道质量信息 (Channel Quality Information ) , 信道协方差矩阵 ( Channel co variance matrix ) ,
"3 GPP Rl -091455, Qualcomm , Hierarchical feedback in support of downlink CoMP operation"中涉及的分等级的反馈 ( Hierarchical Feedback ), "3GPP Rl -092032, ALU, CQI and CSI Feedback Compression" 中涉及的基于转换的反馈压缩 ( Transform-based Feedback Compression ) 等。
不失一般性地, 以下以信道信息为预编码矩阵索引为例对根据本发 明的一个实施例的信道信息反馈方案进行描述。 本领域普通技术人员可 以理解, 本发明的信道信息反馈方案同样适用于信道信息为信道质量信 息或者信道协方差矩阵等的情形。
不失一般性地, 以下以下行链路为例进行说明。
目前, 在预编码矩阵索引信息反馈中, 通常采用预编码矩阵索引差 分反馈方式以减少反馈开销。 以下实施例中将以接收设备 10 以预编码 矩阵索引差分反馈方式将预编码矩阵索引信息反馈至发送设备 20 为例 进行说明。
关于如何构建用于预编码矩阵索引差分反馈方案的码本( codebook ) 目前已有多种方案。 以 "IEEE C80216m-08J074rr 中提出的方案为例, 如图 4 所示, 对于一个预定义的码本(也即, 预编码矩阵集合), 例如 用于 4根发射天线的 LTE 4-bit rank-1码本中的每一个码字(也即, 预编 码矩阵), 在该码本中查找 L个, 例如 8个最优的码字使得下列方程最 大化
其中 , = 1,·..,16)是该码本( codebook )中的一个码字( codeword 基于此, 该码本中的每一个码字都有一组与其高度相关的码字子集 来构建成差分码本。 例如, 码字 1的码字子集索引为 {1,5,6,8,10,11,14,16} , 码字 2的码字子集索引为 {2,5,7,8,9,12,15,16}。
需要说明的是, 除了基本码本之外, 这些码字子集索引也应当分别 存储在发送设备 20和接收设备 10—侧。
接收设备 10 首先从多个无线资源块中选择一个无线资源块(称为 第一无线资源块)作为差分编码 ( differential encoding ) 的开始。 同时,
接收设备 10 还从谅多个无线资源块中选出与该第一无线资源块高度相 关的多个无线资源块。
接收设备 10首先预测谅第一无线资源块上的信道状态信息( CSI ), 然后, 根据预测出的信道状态信息以及基于预定准则, 例如, 最小化弦 距离或最大化信噪比( SINR )从基本码本中为该第一无线资源块选择一 个码字 (称为基本码字), 并将该基本码字的索引作为基本预编码矩阵 索引。
然后, 接收设备 10 分別预测与该第一无线资源块高度相关的多个 无线资源块上的信道状态信息, 并根据预测出的信道状态信息以及基于 预定准则, 在该基本码字的码字子集中分别为与读第一无线资源块高度 相关的多个无线资源块查找最优的码字, 并将读些码字的索引与基本码 字的索引的偏置值作为与该第一无线资源块高度相关的多个无线资源 块的差分预编码矩阵索引。
对于每组无线资源块, 接收设备 10 均重复上述步骤。 需要说明的 是, 对于每組无线资源块, 需要重设基本码本, 也即, 从该基本码本中 重新选择一个基本码字。
接着, 接收设备 10根据基本预编码矩阵索引以及差分预编码矩阵 索引的重要性等级, 为基本预编码矩阵索引和差分预编码矩阵索引选择 不同的调制编码方式, 并且根据所选择的调制编码方式, 分别对基本预 编码矩阵索引和差分预编码矩阵索引进行调制编码处理后反馈至发送 设备 20。
由于基本预编码矩阵索引的重要性等级远高于差分预编码矩阵索 引, 因此, 接收设备 10 为基本预编码矩阵索引选择强壮性较高的调制 编码方式, 例如 QPSK+1/4 Turbo编码; 为差分预编码矩阵索引选择强 壮性较低但谱效率较高的调制编码方式, 例如 QPSK+3/4 Turbo编码, 或者 16QAM+1/2 Turbo编码。
在一个实施例中, 接收设备 10还根据基本预编码矩阵索引以及差 分预编码矩阵索引的重要性等级, 为基本预编码矩阵索引和差分预编码 矩阵索引选择不同的物理信道进行传输。
由于基本预编码矩阵索引的重要性等级远高于差分预编码矩阵索
引, 因此, 接收设备 10 为经调制编码处理后的基本预编码矩阵索引选 择传输延迟较小的物理信道, 例如物理上行控制信道(Physical Uplink Control Channel, PUCCH )进行传输; 为经调制编码处理后的差分预编码 对较大的物理信道, 例如物理上行共享信道 (Physical Uplink Shared Channel, PUSCH )进行传输。
发送设备 20在不同的物理信道上分别接收由接收设备 10反馈的经 调制编码处理后的基本预编码矩阵索引以及差分预编码矩阵索引, 例 如, 在物理上行控制信道(PUCCH ) 上接收由接收设备 10反馈的经调 制编码处理后的基本预编码矩阵索引以及在物理上行共享信道 ( PUSCH )上接收由接收设备 10反馈的经调制编码处理后的差分预编 码矩阵索引后, 对经调制编码处理, 例如 QPSK+1/4 Turbo编码处理后 的基本预编码矩阵索引进行与该调制编码处理相逆的解调解码处理以 获得基本预编码矩阵索引, 以及对经调制编码处理, 例如 QPSK+3/4 Turbo 编码处理后的差分预编码矩阵索引进行与该调制编码处理相逆的 解调解码处理以获得差分预编码矩阵索引。
而后, 发送设备 20根据获得的基本预编码矩阵索引从基本码本中 查找相对应的码字, 以及 4艮据获得的差分预编码矩阵索引在该码字的码 字子集中查找相对应的码字。 所查找到的码字, 也即预编码矩阵分別用 于对在相应的无线资源块上传输的数据进行预编码处理, 例如, 单用户 预编码处理, 或者多用户预编码处理。
对于每组无线资源块, 发送设备 20均重复上述步骤。
需要说明的是, 发送设备 20根据预编码矩阵对待传输数据进行预 编码处理以及在该预编码处理之前和之后对待传输的数据进行的处理 可使用现有技术中已有的处理方式, 为简明起见, 在此不作赘述。
通过使用根据本发明的一个实施例的信道信息反馈方案, 可以取得 较好的性能增益。 为证明 i亥方案的有效性, 使用二进制差错模型 ( P{0 /\) = a,P(l /\) = \ ~ a )设计一个简单但有效的仿真, 用于仿真真实 调制编码方案的影响。 强壮性较高的调制编码方案对应于较小的错误概 率 α。对于现有的对所有的信道反馈信息都使用相同的调制编码方案的
信道信息反馈方案, " = 0.1。 而对于对不同重要性等级的信道信息使用 不同差错保护方案的信道信息反馈方案, 基本预编码矩阵索引的错误概 率为《 = 0.01,其余 7个差分预编码矩阵索引的错误概率为 a = 0.1786 , 因此, 在该反馈方案中, 基本预编码矩阵索引和差分预编码矩阵索引的 平均错误概率也等于 0.1 , 从而确保了比较的公平性。
在该仿真中, 使用现实的空间相关性信道模型以及 OFDM传输链, 其他仿真参数如下表:
图 5示出了瞬时信道容量的累积分布函数曲线。 图中的两根曲线分 别为在真实传输错误模型下使用相同错误保护机制的预编码矩阵索引 差分反馈方式的累计分布函数曲线, 以及在真实传输错误模型下使用不 同错误保护机制的预编码矩阵索弓 ]差分反馈方式的累计分布函数曲线。
由图中曲线可见, 与使用相同错误保护机制相比, 使用不同错误保 护机制能够莸得更好的系统性能。
图 6示出了平均信道容量-信噪比曲线。图中的两 >曲线分别为在真 实传输错误模型下使用相同错误保护机制的预编码矩阵索引差分反馈 方式的平均信道容量-信噪比曲线,以及在真实传输错误模型下使用不同 错误保护机制的预编码矩阵索引差分反馈方式的平均信道容量-信噪比
曲线。
由图中曲线可见, 在相同的平均信道容量下, 与使用相同错误保护 机制相比, 使用不同错误保护机制能够获取平均 ldB的信噪比增益。 以上是从方法步骤的角度对本发明的技术方案进行的描述, 以下将 从装置模块的角度对本发明的技术方案进行进一步描述。
图 7示出了根据本发明的一个实施例的在多输入多输出无线通信系 统的接收设备中用于向发送设备反馈信道信息的反馈装置的结构框图。
图中, 反馈装置 100 包括第一选择装置 1001 以及调制编码装置 1002。
首先, 接收设备 10中的反馈装置 100中的第一选择装置 1001根据 信道信息中各部分信息的重要性等级, 为该各部分信息选择不同的调制 编码方式。 其中, 第一选择装置 1001 为该各部分信息选择的调制编码 方式的强壮性与读各部分信息的重要性等级成正比。 也即, 重要性等级 越高的信息, 为其选择的调制编码方式越强壮。
其次,反馈装置 100中的调制编码装置 1002才艮据第一选择装置 1001 为各部分信息所选择的调制编码方式, 分别对该各部分信息进行调制编 码处理, 并将经调制编码处理后的各部分信息反馈至发送设备 20。
在一个实施例中, 反馈装置 100中的第二选择装置 (为筒明起见, 图 7中未示出)还根据信道信息中各部分信息的重要性等级, 为读各部 分信息选择不同的物理信道进行传输。 其中, 第二选择装置为该各部分 信息选择的物理信道的传输延迟容忍度与谅各部分信息的重要性成反 比。 也即, 重要性等级越高的信息, 为其选择的物理信道的传输延迟容 忍度越低。
然后, 调制编码装置 1002将经过调制编码处理后的各部分信息通 过为谅各部分信息所选择的物理信道反馈至发送设备 20。
接收设备 10向发送设备 20反馈的信道信息包括但不限于预编码矩 阵索引 ( Preceding Matrix Index ) , 信道质量信息 (Channel Quality Information ) , 信道协方差矩阵 ( Channel covariance matrix ) , "3 GPP Rl-091455, Qualcomm , Hierarchical feedback in support of downlink
CoMP operation,,中涉及的分等级的反馈 ( Hierarchical Feedback ), "3GPP Rl-092032, ALU, CQI and CSI Feedback Compression"中涉及的基于转换 的反馈£缩 ( Transform-based Feedback Compression )等。
图 8示出了才艮据本发明的一个实施例的多输入多输出无线通信系统 的发送设备中用于接收由接收设备反馈的信道信息的处理装置的结构 框图。
图中, 处理装置 200包括接收装置 2001以及解调解码装置 2002。 首先, 发送设备 20中的处理装置 200中的接收装置 2001分别接收 由接收设备 10反馈的经调制编码处理后的信道信息中的各部分信息。
如果接收设备 10 在不同的物理信道上反馈经调制编码处理后的各 部分信息, 那么, 在一个实施例中, 接收装置 2001 分别在不同的物理 信道上接收由接收设备 10反馈的经调制编码处理后的信道信息中的各 部分信息。
然后, 处理装置 200 中的解调解码装置 2002分别对所接收到的经 调制编码处理后的各部分信息进行与接收设备 10 一侧所进行的调制编 码处理相逆的解调解码处理。
发送设备 20接收到的由接收设备 10反馈的信道信息包括但不限于 预编码矩阵索引 (Precoding Matrix Index ), 信道质量信息 (Channel Quality Information ) , 信道协方差矩阵 ( Channel co variance matrix ) , " 3 GPP Rl-091455, Qualcomm , Hierarchical feedback in support of downlink CoMP operation"中涉及的分等级的反馈 ( Hierarchical Feedback ), "3GPP Rl-092032, ALU, CQI and CSI Feedback Compression" 中涉及的基于转换的反馈压縮 ( Transform-based Feedback Compression ) 等。
不失一般性地, 以下以信道信息为预编码矩阵索引为例对根据本发 明的一个实施例的信道信息反馈方案进行描述。 本领域普通技术人员可 以理解, 本发明的信道信息反馈方案同样适用于信道信息为信道质量信 息或者信道协方差矩阵等的情形。
不失一般性地, 以下以下行链路为例进行说明。
目前, 在预编码矩阵索引信息反情中, 通常采用预编码矩阵索引差
分反馈方式以减少反馈开销。 以下实施例中将以接收设备 10 以预编码 矩阵索引差分反馈方式将预编码矩阵索引信息反馈至发送设备 20 为例 进行说明。
关于如何构建用于预编码矩阵索引差分反馈方案的码本( codebook ) 目前已有多种方案。 以 "IEEE C80216m-08_1074rl" 中提出的方案为例, 如图 4 所示, 对于一个预定义的码本(也即, 预编码矩阵集合), 例如 用于 4根发射天线的 LTE 4-bit rank-1码本中的每一个码字(也即, 预编 码矩阵), 在该码本中查找 L个, 例如 8个最优的码字使得下列方程最 大化
其中, = 1,...,16)是该码本( codebook )中的一个码字 ( codeword )。 基于此, 谅码本中的每一个码字都有一组与其高度相关的码字子集 来构建成差分码本。 例如, 码字 1的码字子集索引为 {1,5,6,8,10,11,14,16} , 码字 2的码字子集索引为 {2,5,7,8,9,12,15,16}。
需要说明的是, 除了基本码本之外, 这些码字子集索引也应当分別 存储在发送设备 20和接收设备 10—侧。
接收设备 10 首先从多个无线资源块中选择一个无线资源块(称为 第一无线资源块)作为差分编码( differential encoding ) 的开始。 同时, 接收设备 10还从该多个无线资源块中选出与该第一无线资源块高度相 关的多个无线资源块。
接收设备 10首先预测谅第一无线资源块上的信道状态信息( CSI ), 然后, 根据预测出的信道状态信息以及基于预定准则, 例如, 最小化弦 距离或最大化信噪比( SIN )从基本码本中为该第一无线资源块选择一 个码字 (称为基本码字), 并将谅基本码字的索引作为基本预编码矩阵 索引。
然后, 接收设备 10 分別预测与该第一无线资源块高度相关的多个 无线资源块上的信道状态信息, 并根据预测出的信道状态信息以及基于 预定准则, 在该基本码字的码字子集中分别为与该第一无线资源块高度 相关的多个无线资源块查找最优的码字, 并将该些码字的索引与基本码
字的索引的偏置值作为与该第一无线资源块高度相关的多个无线资源 块的差分预编码矩阵索引。
对于每组无线资源块, 接收设备 10 均重复上述功能。 需要说明的 是, 对于每组无线资源块, 需要重设基本码本, 也即, 从该基本码本中 重新选择一个基本码字。
接着, 接收设备 10中的反馈装置 100中的第一选择装置 1001根据 基本预编码矩阵索引以及差分预编码矩阵索引的重要性等级, 为基本预 编码矩阵索引和差分预编码矩阵索引选择不同的调制编码方式, 然后, 反馈装置 100 中的调制编码装置 1002根据所选择的调制编码方式, 分 别对基本预编码矩阵索引和差分预编码矩阵索引进行调制编码处理后 反馈至发送设备 20。
由于基本预编码矩阵索引的重要性等级远高于差分预编码矩阵索 引, 因此, 第一选择装置 1001 为基本预编码矩阵索引选择强壮性较高 的调制编码方式, 例如 QPSK+1/4 Turbo编码; 为差分预编码矩阵索引 选择强壮性较低但谱效率较高的调制编码方式, 例如 QPSK+3/4 Turbo 编码, 或者 16QAM+l/2 Turbo编码。
在一个实施例中, 反馈装置 100中的第二选择装置还根据基本预编 码矩阵索引以及差分预编码矩阵索引的重要性等级, 为基本预编码矩阵 索引和差分预编码矩阵索引选择不同的物理信道进行传输。
由于基本预编码矩阵索引的重要性等级远高于差分预编码矩阵索 引, 因此, 第二选择装置为经调制编码处理后的基本预编码矩阵索引选 择传输延迟较小的物理信道, 例如物理上行控制信道(Physical Uplink Control Channel, PUCCH )进行传输; 为经调制编码处理后的差分预编码 矩阵索引选择与传输基本预编码矩阵索引的物理信道相比传输延迟相 对较大的物理信道, 例如物理上行共享信道 ( Physical Uplink Shared Channel, PUSCH )进行传输。
发送设备 20中的处理装置 200中的接收装置 2001在不同的物理信 道上分别接收由接收设备 10 反馈的经调制编码处理后的基本预编码矩 阵索引以及差分预编码矩阵索引,例如,在物理上行控制信道(PUCCH ) 上接收由接收设备 10反馈的经调制编码处理后的基本预编码矩阵索引
以及在物理上行共享信道(PUSCH )上接收由接收设备 10反馈的经调 制编码处理后的差分预编码矩阵索引后, 处理装置 200中的解调解码装 置 2002对经调制编码处理, 例如 QPSK+1/4 Turbo编码处理后的基本预 编码矩阵索引进行与该调制编码处理相逆的解调解码处理以获得基本 预编码矩阵索引, 以及对经调制编码处理, 例如 QPSK+3/4 Turbo编码 处理后的差分预编码矩阵索引进行与该调制编码处理相逆的解调解码 处理以获得差分预编码矩阵索引。
而后, 发送设备 20根据获得的基本预编码矩阵索引从基本码本中 查找相对应的码字, 以及 ^据获得的差分预编码矩阵索引在该码字的码 字子集中查找相对应的码字。 所查找到的码字, 也即预编码矩阵分别用 于对在相应的无线资源块上传输的数据进行预编码处理, 例如, 单用户 预编码处理, 或者多用户预编码处理。
对于每组无线资源块, 发送设备 20中的各装置均重复上述功能。 需要说明的是, 发送设备 20根据预编码矩阵对待传输数据进行预 编码处理以及在该预编码处理之前和之后对待传输的数据进行的处理 可使用现有技术中已有的处理方式, 为简明起见, 在此不作赘述。 尽管在附图和前述的描述中详细阐明和描述了本发明, 应认为该阐 明和描述是说明性的和示例性的, 而不是限制性的; 本发明不限于所上 述实施方式。
那些本技术领域的一般技术人员可以通过研究说明书、 公开的内容 及附图和所附的权利要求书, 理解和实施对披露的实施方式的其他改 变。 在权利要求中, 措词 "包括" 不排除其他的元素和步骤, 并且措辞 "一个" 不排除复数。 在本发明的实际应用中, 一个零件可能执行权利 要求中所引用的多个技术特征的功能。 权利要求中的任何附图标记不应 理解为对范围的限制。
Claims
1. 一种在多输入多输出无线通信系统的接收设备中用于向发送设 备反馈信道信息的方法, 其中, 所述方法包括以下步骤:
a. 根据所述信道信息中各部分信息的重要性等级, 为所述各部分信 息选择不同的调制编码方式, 其中, 为所述各部分信息选择的调制编码 方式的强壮性与所述各部分信息的重要性等级成正比;
b. 根据步骤 a中所选择的调制编码方式,分别对所述信道信息中的 各部分信息进行调制编码处理后发送至所述发送设备。
2.根据权利要求 1所述的方法, 其特征在于, 所述方法还包括以下 步骤:
m. 根据所述信道信息中各部分信息的重要性等级, 为所述各部分 信息选择不同的物理信道进行传输, 其中, 为所述各部分信息选择的物 理信道的传输延迟容忍度与所述各部分信息的重要性成反比;
其中, 所述步骤 b还包括:
将经过调制编码处理后的各部分信息通过步骤 m 中所选择的物理 信道反馈至所述发送设备。
3. 根据权利要求 1所述的方法, 其特征在于, 所述信道信息包括预 编码矩阵索引, 或者信道质量信息, 或者信道协方差矩阵。
4. 根据权利要求 1所述的方法, 其特征在于, 所述信道信息为预编 码矩阵索引, 所述步骤 a还包括:
为所述预编码矩阵索引中的基本预编码矩阵索引选择第一调制编 码方式, 以及为所述预编码矩阵索引中的差分预编码矩阵索引选择第二 调制编码方式, 其中, 所述第一调制编码方式的强壮性优于所述第二调 制编码方式;
所述步骤 b包括:
根据第一调制编码方式对所述预编码矩阵索引中的基本预编码矩 阵索引进行调制编码处理后发送至所述发送设备, 以及 据第二调制编 码方式对所述预编码矩阵索引中的差分预编码矩阵索引进行调制编码 处理后发送至所述发送设备。
5.根椐权利要求 4所述的方法, 其特征在于, 所述方法还包括以下 步骤:
X. 为所述预编码矩阵索引中的基本预编码矩阵索引选择物理控制 信道进行传输, 以及为所述预编码矩阵索引中的差分预编码矩阵索引选 择物理共享信道进行传输;
其中, 所述步驟 b还包括:
将经过调制编码处理后的基本预编码矩阵索引通过所述物理控制 信道发送至所述发送设备, 以及将经过调制编码处理后的差分预编码矩 阵索引通过物理共享信道发送至所述发送设备。
6. —种在多输入多输出无线通信系统的发送设备中用于接收由接 收设备反馈的信道信息的方法, 其中, 所述方法包括以下步骤:
A. 分别接收由所述接收设备反馈的经调制编码处理后的所述信道 信息中的各部分信息;
B. 分别对所接收到的经调制编码处理后的各部分信息进行与所述 接收设备端所进行的调制编码处理相逆的解调解码处理。
7. 根据权利要求 6所述的方法, 其特征在于, 所述步骤 A还包括: 分别在不同的物理信道上接收由所述接收设备反馈的经调制编码 处理后的所述信道信息中的各部分信息。
8. 根据权利要求 6所述的方法, 其特征在于, 所述信道信息包括预 编码矩阵索引, 或者信道质量信息, 或者信道协方差矩阵。
9. 根据权利要求 6所述的方法, 其特征在于, 所述信道信息为预编 码矩阵索引, 所述步骤 A还包括:
接收由所述接收设备反馈的经第一调制编码处理后的基本预编码 矩阵索引以及经第二调制编码处理后的差分预编码矩阵索引, 其中, 所 述第一调制编码处理的强壮性优于第二调制编码处理;
其中, 所迷步骤 B还包括:
对所接收到的经第一调制编码处理后的基本预编码矩阵索引进行 与所述第一调制编码处理相逆的解调解码处理, 以及对所接收到的经第 二调制编码处理后的差分预编码矩阵索引进行与所述第二调制编码处 理相逆的解调解码处理。
10. 根据权利要求 9所述的方法,其特征在于,所述步骤 A还包括: 在物理控制信道上接收由所述接收设备反馈的经第一调制编码处 理后的基本预编码矩阵索引, 以及在物理共享信道上接收由所述接收设 备反馈的经第二调制编码处理后的差分预编码矩阵索引。
11. 一种在多输入多输出无线通信系统的接收设备中用于向发送设 备反馈信道信息的反馈装置, 其中, 所述反馈装置包括:
第一选择装置, 用于根据所述信道信息中各部分信息的重要性等 级, 为所述各部分信息选择不同的调制编码方式, 其中, 为所述各部分 信息选择的调制编码方式的强壮性与所述各部分信息的重要性等级成 正比;
调制编码装置, 用于根据所述第一选择装置所选择的调制编码方 式, 分别对所述信道信息中的各部分信息进行调制编码处理后发送至所 述发送设备。
12.根据权利要求 11所述的反馈装置, 其特征在于, 所述反馈装置 还包括:
第二选择装置, 用于根据所述信道信息中各部分信息的重要性等 级, 为所述各部分信息选择不同的物理信道进行传输, 其中, 为所述各 部分信息选择的物理信道的传输延迟容忍度与所述各部分信息的重要 性成反比;
其中, 所述调制编码装置还用于:
将经过调制编码处理后的各部分信息通过所述第二选择装置中所 选择的物理信道反馈至所述发送设备。
13. 根椐权利要求 11所述的反馈装置, 其特征在于, 所述信道信息 为预编码矩阵索引, 所述第一选择装置用于:
为所述预编码矩阵索引中的基本预编码矩阵索引选择第一调制编 码方式, 以及为所述预编码矩阵索引中的差分预编码矩阵索引选择第二 调制编码方式, 其中, 所述第一调制编码方式的强壮性优于所述第二调 制编码方式;
所述调制编码装置用于:
根据第一调制编码方式对所述预编码矩阵索引中的基本预编码矩 阵索引进行调制编码处理后发送至所述发送设备, 以及根据第二调制编 码方式对所述预编码矩阵索引中的差分预编码矩阵索引进行调制编码 处理后发送至所述发送设备。
14. 一种在多输入多输出无线通信系统的发送设备中用于接收由接 收设备反馈的信道信息的处理装置, 其中, 所述处理装置包括:
接收装置, 用于分别接收由所述接收设备反馈的经调制编码处理后 的所述信道信息中的各部分信息;
解调解码装置, 用于分别对所接收到的经调制编码处理后的各部分 信息进行与所述接收设备端所进行的调制编码处理相逆的解调解码处 理。
15. 根据权利要求 14所述的处理装置, 其特征在于, 所述接收装置 还用于:
分别在不同的物理信道上接收由所述接收设备反馈的经调制编码 处理后的所述信道信息中的各部分信息。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010800579122A CN102687477A (zh) | 2010-03-09 | 2010-03-09 | 多输入多输出无线通信系统中反馈信道信息的方法和装置 |
PCT/CN2010/070926 WO2011109933A1 (zh) | 2010-03-09 | 2010-03-09 | 多输入多输出无线通信系统中反馈信道信息的方法和装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CN2010/070926 WO2011109933A1 (zh) | 2010-03-09 | 2010-03-09 | 多输入多输出无线通信系统中反馈信道信息的方法和装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011109933A1 true WO2011109933A1 (zh) | 2011-09-15 |
Family
ID=44562783
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2010/070926 WO2011109933A1 (zh) | 2010-03-09 | 2010-03-09 | 多输入多输出无线通信系统中反馈信道信息的方法和装置 |
Country Status (2)
Country | Link |
---|---|
CN (1) | CN102687477A (zh) |
WO (1) | WO2011109933A1 (zh) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023197298A1 (en) * | 2022-04-15 | 2023-10-19 | Nec Corporation | Method, device and computer storage medium of communication |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1335722A (zh) * | 2001-08-28 | 2002-02-13 | 清华大学 | 一种采用多层分组乘积码的信道编码调制方法 |
CN1520700A (zh) * | 2001-11-08 | 2004-08-11 | ������������ʽ���� | 无线通信方法及用于其中的移动体终端 |
US6947490B1 (en) * | 2000-06-22 | 2005-09-20 | Nortel Networks Limited | Cellular radio communications system |
CN1780255A (zh) * | 2004-11-24 | 2006-05-31 | 大唐移动通信设备有限公司 | 非均等保护的无线数据传输方法 |
CN1984111A (zh) * | 2006-05-11 | 2007-06-20 | 华为技术有限公司 | 一种ofdm系统中控制信息的传输方法及应用 |
-
2010
- 2010-03-09 WO PCT/CN2010/070926 patent/WO2011109933A1/zh active Application Filing
- 2010-03-09 CN CN2010800579122A patent/CN102687477A/zh active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6947490B1 (en) * | 2000-06-22 | 2005-09-20 | Nortel Networks Limited | Cellular radio communications system |
CN1335722A (zh) * | 2001-08-28 | 2002-02-13 | 清华大学 | 一种采用多层分组乘积码的信道编码调制方法 |
CN1520700A (zh) * | 2001-11-08 | 2004-08-11 | ������������ʽ���� | 无线通信方法及用于其中的移动体终端 |
CN1780255A (zh) * | 2004-11-24 | 2006-05-31 | 大唐移动通信设备有限公司 | 非均等保护的无线数据传输方法 |
CN1984111A (zh) * | 2006-05-11 | 2007-06-20 | 华为技术有限公司 | 一种ofdm系统中控制信息的传输方法及应用 |
Also Published As
Publication number | Publication date |
---|---|
CN102687477A (zh) | 2012-09-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5647195B2 (ja) | 多重入出力システムにおけるチャンネル品質情報フィードバック方法、データ伝送方法、ユーザ機器及び基地局 | |
US9137802B2 (en) | DL MU-MIMO operation in LTE-A | |
KR101333921B1 (ko) | 빔형성 피드백을 제공하기 위한 방법 및 시스템 | |
US8457236B2 (en) | Feedback strategies for multi-user MIMO communication systems | |
US8509339B2 (en) | Reference signaling scheme using compressed feedforward codebooks for multi-user multiple input multiple output (MU-MIMO) systems | |
US8644415B2 (en) | Method for precoding using a block diagonal matrix | |
JP5387575B2 (ja) | 無線通信システム及び無線通信方法 | |
US8626081B2 (en) | Method and arrangements for signaling control information in a communication system | |
US7929636B2 (en) | Techniques for reducing precoding overhead in a multiple-input multiple-output wireless communication system | |
US20150030058A9 (en) | Cqi feedback for mimo deployments | |
JPWO2006075661A1 (ja) | 無線通信方法、無線受信装置、無線送信装置、および無線通信システム | |
CN102714530A (zh) | 用于支持无线通信中的su-mimo 和mu-mimo 操作的反馈 | |
WO2011124021A1 (zh) | 用于信息反馈以及预编码的方法和装置 | |
US8699621B2 (en) | Precoding selection for retransmission in uplink MIMO hybrid ARQ | |
US10505614B2 (en) | CSI feedback method, precoding method, and apparatus | |
WO2010066731A1 (en) | Mobile communication device, network node, communication system and method for distributed cooperative multi-antenna communication | |
CN109075890B (zh) | 无线电信道质量的报告 | |
JP5865485B2 (ja) | 多重入出力(mimo)のための空間チャネル状態情報のフィードバック方法およびシステム | |
JP5797577B2 (ja) | 無線通信基地局装置、無線通信端末装置及びフィードバック方法 | |
WO2014162567A1 (ja) | 移動局、基地局、及び通信制御方法 | |
WO2015090021A1 (zh) | 波束质量信息反馈方法和系统 | |
WO2013064044A1 (zh) | 预编码控制指示反馈方法、用户设备及基站 | |
WO2014021768A1 (en) | Channel quality reporting in a wireless communication system | |
WO2017076220A1 (zh) | 一种信道状态信息csi反馈方法、终端及基站 | |
KR20080065493A (ko) | Mimo 통신 시스템에서 코드워드와 스트림의 조합 표시방법 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201080057912.2 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 10847192 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 10847192 Country of ref document: EP Kind code of ref document: A1 |