WO2012022100A1 - 一种码本的配置方法、装置和系统 - Google Patents

一种码本的配置方法、装置和系统 Download PDF

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Publication number
WO2012022100A1
WO2012022100A1 PCT/CN2010/080326 CN2010080326W WO2012022100A1 WO 2012022100 A1 WO2012022100 A1 WO 2012022100A1 CN 2010080326 W CN2010080326 W CN 2010080326W WO 2012022100 A1 WO2012022100 A1 WO 2012022100A1
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Prior art keywords
codebook
codeword
subset
restricted
codewords
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PCT/CN2010/080326
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English (en)
French (fr)
Inventor
陈艺戬
于辉
李儒岳
徐俊
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to KR1020127023745A priority Critical patent/KR101489879B1/ko
Priority to RU2012136922/08A priority patent/RU2549508C2/ru
Priority to EP10856098.8A priority patent/EP2536083B1/en
Priority to MX2012010581A priority patent/MX2012010581A/es
Priority to JP2012557380A priority patent/JP2013522982A/ja
Priority to US13/634,574 priority patent/US8976839B2/en
Priority to BR112012022728-9A priority patent/BR112012022728B1/pt
Publication of WO2012022100A1 publication Critical patent/WO2012022100A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/62Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478Special codebook structures directed to feedback optimisation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0636Feedback format
    • H04B7/0639Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/02Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891Spatial equalizers
    • H04L25/03949Spatial equalizers equalizer selection or adaptation based on feedback
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0014Three-dimensional division
    • H04L5/0023Time-frequency-space

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a method, an apparatus and a system for configuring a codebook.
  • multiple antennas are used at both the transmitting end and the receiving end to obtain a higher rate by spatial multiplexing. Since the channel matrix experienced by the transmitted signal can be obtained by channel estimation at the receiving end, even if each antenna transmits different data, after the multiplexed multiple-input multiple-output (MIMO) channel matrix, The receiving end is still able to solve the transmission data on each antenna.
  • MIMO multiple-input multiple-output
  • a simple and effective means of using the channel matrix to directly solve the transmitted data on each antenna is to use a precoding technique.
  • the precoding technique can change the channel transfer matrix equivalently as needed.
  • the transmitting end pre-codes the data on the layer, maps it to the antenna, and then sends it to the receiving end through the wireless channel. If the channel state information (CSI) can be known at the transmitting end, the singular value decomposition can be performed on the specific channel matrix. Then, the right singular matrix decomposed by the channel matrix is used as a precoding matrix, and then the data of each layer is precoded.
  • CSI can only be obtained directly and accurately at the receiving end.
  • CSI information can only be fed back to the transmitting end through the receiving end.
  • the method commonly used is based on the feedback of the codebook. That is, at the receiving end, the appropriate codeword is selected in the codebook according to the current channel condition and its index value in the codebook set is fed back to the transmitting end, so that the feedback amount can be greatly reduced.
  • Codebook based precoding is a form of channel quantization. Assume that the limited feedback channel capacity is
  • the transmitting end and the receiving end jointly save or generate the codebook in real time (the transmitting end is the same as the receiving end).
  • the receiving end selects one from the codebook space according to certain criteria.
  • the best codeword and the index of the codeword ⁇ is recommended to the transmitting end.
  • the codeword index is referred to as a Precoding Matrix Indicator (PMI) in the codebook.
  • PMI Precoding Matrix Indicator
  • the transmitting end may directly find the corresponding precoding code word ⁇ according to the index 7 ' to transmit, or may not accept the code word recommended by the receiving end but directly select the code word to transmit.
  • the actual used codeword index will be notified to the receiving end during the transmission.
  • LTE-A Long Term Evolution Advanced
  • LTE-A supports larger system bandwidths (up to 100 MHz) and is backward compatible with existing LTE standards.
  • LTE-A supports up to 8 antennas and 8 layers of transmission on the basis of the existing LTE system, and proposes some feedback enhancement techniques.
  • the main purpose is to enhance the feedback accuracy of the codebook.
  • This technology can improve the spectrum utilization of the evolved International Mobile Telecommunications-Advance (IMT-Advance) system and alleviate the shortage of spectrum resources.
  • IMT-Advance International Mobile Telecommunications-Advance
  • the precoding/feedback structure of a subband consists of two matrices.
  • Each of the two matrices belongs to a separate codebook.
  • the codebook is known in advance by the base station and the user equipment (UE).
  • the codebook can vary at different times and on different subbands.
  • a matrix represents the properties of a wideband or long-term channel. Another matrix represents the properties of the determined frequency band or short-term channel.
  • the matrix codebook used is represented in the form of a finite number of matrix sets, and each matrix is known to the UE and the base station. From this, we can see that the feedback of the channel information proposes a structure based on the dual codebook, which can be further described as follows: For a subband or multiple joint subbands that need to feed back channel information, the UE feeds back to the base station. At least two PMI information, namely PMI1 and PMI2, respectively, wherein PMI1 corresponds to a codeword W1 in one codebook C1, and PMI2 corresponds to a codeword W2 in another codebook C2.
  • the base station has the same information of C1 and C2. After receiving PMI1 and PMI2, the corresponding codewords W1 and W2 are found from the corresponding codebooks C1 and C2, and the channel information is obtained according to the agreed function rule F (Wl, W2). .
  • the codebook size usually determines the signaling overhead, and the larger the codebook, the better the better performance. Therefore, the compromise between performance and overhead is usually considered in the codebook design. In the actual codebook design, a variety of factors are usually considered, such as suitable for as many channel environments and antenna configurations as possible.
  • all the code words in the codebook are not necessarily suitable for the current specific transmission situation, but when the receiving end performs codeword selection, it is necessary to traverse all the codewords in the codebook. This not only brings about an increase in the computational complexity of the receiving end, but also increases the situation in which the receiving end incorrectly selects the codeword due to some non-ideal processes, especially in the case of a relatively large codebook design.
  • the technical problem to be solved by the present invention is to propose a method, a device and a system for configuring a codebook, so as to reduce the computational complexity of the receiving end when performing codeword selection and reduce the situation in which the receiving end incorrectly selects the codeword.
  • the present invention provides a method for configuring a codebook, which is applied to an Advanced Long Term Evolution (LTE-A) system, and the method includes:
  • the transmitting end selects a restricted subset of codewords and notifies the receiving end;
  • the codeword restricted subset includes a partial codeword or all codewords in the first codebook and/or the second codebook;
  • the receiving end selects an optimal precoding codeword in the codeword restricted subset, and informs the transmitting end of the index of the best precoding codeword.
  • the method may also have the following characteristics:
  • the transmitting end informs the receiving end of the selected codeword restricted subset through high layer signaling.
  • the method may also have the following characteristics:
  • the transmitting end In the step of selecting a codeword restriction subset at the transmitting end and informing the receiving end, the transmitting end notifies the receiving end of the selected codeword restricted subset by transmitting signaling carrying the restricted subset bitmap to the receiving end;
  • Each information bit in the restricted subset bitmap is associated with a codeword to indicate whether the associated codeword belongs to the codeword restricted subset.
  • the method may also have the following characteristics:
  • the transmitting end passes Set the restricted subset bitmap as one of the following:
  • each codeword combination is associated with an information bit in the restricted subset bitmap, the codeword restricted subset including the codeword extracted from the first codebook and the codeword extracted from the second codebook ;
  • each codeword in the first codebook is associated with one information bit in the restricted subset bitmap, the codebook limitation
  • the subset includes a codeword extracted from the first codebook and all codewords of the second codebook;
  • each codeword in the second codebook is associated with one information bit in the restricted subset bitmap, the codebook limitation
  • the subset includes a codeword extracted from the second codebook and all codewords of the first codebook;
  • the bit confinement subset includes a codeword extracted from the first codebook and a codeword extracted from the second codebook.
  • the method may also have the following characteristics:
  • the restricted subset bitmap includes L information bits
  • the first codebook includes M codewords, and the second codebook includes N codewords.
  • the method may also have the following characteristics:
  • the codeword restricted subset further includes all codewords in a single codebook using only a single codebook; selecting the best precoding codeword in the codeword restricted subset at the receiving end, and In the step of informing the transmitting end of the index of the best precoding codeword, the receiving end selects the codeword of the first codebook and the second codebook included in the codeword restricted subset according to the value of the transmission rank. Optimal precoding codeword, or selecting the best precoding code among the codewords of the single codebook included in the codeword restricted subset Word.
  • the method may also have the following characteristics:
  • the receiving end notifies the transmitting end of the index of the best pre-encoded codeword by means of periodic feedback and/or aperiodic feedback;
  • the transmitting end selects the same codeword restricted subset, or respectively selects Different codeword restricted subsets.
  • the present invention provides a codebook configuration apparatus, including a first selection module and a first transceiver module, wherein: the first selection module is configured to: select a codeword restriction subset and notify the first Transceiver module; the codeword restriction subset includes a partial codeword or all codewords in the first codebook and/or the second codebook; the first transceiver module is configured to: limit the subset of the selected codewords Inform the receiving end.
  • the device may also have the following characteristics:
  • the first selection module is configured to: notify the first transceiver module of the selected subset of codewords by transmitting a restricted subset bitmap to the first transceiver module;
  • the first transceiver module is configured to: notify a receiving end of the selected codeword restriction subset by transmitting a signal carrying a restricted subset bitmap to the receiving end;
  • Each information bit in the restricted subset bitmap is associated with a codeword to indicate whether the associated codeword belongs to the codeword restricted subset.
  • the device may also have the following characteristics:
  • the first selection module is configured to: set a restricted subset bitmap by one of the following methods:
  • each codeword combination is associated with an information bit in the restricted subset bitmap, the codeword restricted subset including the codeword extracted from the first codebook and the codeword extracted from the second codebook ;
  • each codeword in the first codebook is associated with one information bit in the restricted subset bitmap, the codebook limitation Subset includes from the first a codeword extracted in the codebook and all codewords of the second codebook;
  • each codeword in the second codebook is associated with one information bit in the restricted subset bitmap, the codebook limitation
  • the subset includes a codeword extracted from the second codebook and all codewords of the first codebook; (4) separately performing subset restriction on the codewords in the first codebook and the second codebook; wherein, the first Each codeword in the codebook and the second codebook is associated with an information bit in the restricted subset bitmap, the codeword restricted subset including the codeword extracted from the first codebook and the second code The codeword extracted in this book.
  • the device may further have the following features: the first selection module is further configured to: the restricted subset bitmap includes L information bits;
  • the first codebook includes M codewords, and the second codebook includes N codewords.
  • the device may also have the following characteristics:
  • the first selection module is further configured to: select, according to a manner of periodic feedback used by the receiving end, and a method of non-period feedback, the transmitting end selects the same codeword restricted subset, or separately selects different codeword restricted subsets.
  • the present invention provides a configuration system for a codebook, including a transmitting end and a receiving end, the transmitting end includes the foregoing configuration device, and the receiving end includes a second selecting module and a second transceiver module, wherein :
  • the second transceiver module is configured to: learn a restricted subset of codewords selected by the transmitting end and notify the second selecting module, and notify the transmitting end of the index of the best precoding codeword selected by the second selecting module;
  • the second selection module is configured to: select an optimal precoding codeword in the codeword restricted subset, and inform an index of the best precoding codeword to the second transceiver module.
  • the codeword restriction in the case of dual codebook is implemented in the LTE-A system, the computational complexity of the receiving end when performing codeword selection is reduced, and the error selection of the codeword by the receiving end is reduced, and Good inheritance of the signaling structure in LTE.
  • FIG. 1 is a flowchart of a method for configuring a codebook according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a configuration system of a codebook according to an embodiment of the present invention.
  • the present invention performs subset restriction on the dual codebook codeword to reduce the computational complexity of the receiving end when performing codeword selection.
  • the present invention supports a system that customizes a codebook according to requirements in a practical application, and a customized codebook (referred to as a codeword restriction subset) is a currently used codebook for channel information quantization, including all of the standard defined codebooks. Or part of the codeword, or include all or part of the codeword defined in the standard and one or more transmission ranks, or a combination of codewords and transmission ranks.
  • a codeword restriction subset is a currently used codebook for channel information quantization, including all of the standard defined codebooks. Or part of the codeword, or include all or part of the codeword defined in the standard and one or more transmission ranks, or a combination of codewords and transmission ranks.
  • a method for configuring a codebook according to an embodiment of the present invention is applicable to an LTE-A system, including:
  • Step 101 The transmitting end selects a restricted subset of codewords and notifies the receiving end.
  • the codeword limiting subset includes a partial codeword or all codewords in the first codebook and/or the second codebook.
  • Step 102 The receiving end selects an optimal precoding codeword in the codeword restricted subset, and notifies the transmitting end of the index of the best precoding codeword.
  • the transmitting end and the receiving end previously know all the codewords in the first codebook and the second codebook, and the transmitting end knows that the first codebook and the second codebook are codeword restricted.
  • a subset that is, a codeword restricted subset.
  • the transmitting end can inform the receiving end of the selected codeword restricted subset through high layer signaling (such as Radio Resource Control (RRC) signaling). Specifically, the transmitting end may notify the receiving end of the selected codeword restricted subset by sending signaling carrying a restricted subset bitmap to the receiving end;
  • RRC Radio Resource Control
  • the restricted subset bitmap may specify all possible codeword restriction subsets at the receiving end, and each information bit in the restricted subset bitmap is associated with the codeword to indicate whether the associated codeword belongs to The codeword limits the subset. For example, when the value of the information bit is 1, the associated codeword is selected in the codeword restriction subset, and the value of the information bit is 0, indicating that the associated codeword is not selected in the codeword restriction subset.
  • the transmitting end may set the restricted subset bitmap by one of the following methods to perform the subset restriction:
  • each codeword combination is associated with an information bit in the restricted subset bitmap, the codeword restricted subset including the codeword extracted from the first codebook and the codeword extracted from the second codebook ;
  • each codeword in the first codebook is associated with one information bit in the restricted subset bitmap, the codebook limitation
  • the subset includes a codeword extracted from the first codebook and all codewords of the second codebook;
  • each codeword in the second codebook is associated with one information bit in the restricted subset bitmap, the codebook limitation
  • the subset includes a codeword extracted from the second codebook and all codewords of the first codebook; (4) separately performing subset restriction on the codewords in the first codebook and the second codebook; wherein, the first Each codeword in the codebook and the second codebook is associated with an information bit in the restricted subset bitmap, the codeword restricted subset including the codeword extracted from the first codebook and the second code The codeword extracted in this book.
  • the restricted subset bitmap includes L information bits (ie, L bits), the first codebook includes M codewords, and the second codebook includes N codewords (ie, the size of the first codebook) For M bits, the size of the second codebook is N bits);
  • the foregoing codeword restriction subset may further include all the codewords in the single codebook in the case of using only a single codebook; the receiving end may include the first code included in the subset of the codeword restriction according to the value of the transmission rank.
  • the best precoding codeword is selected from the code words of the present and second codebooks, or the best precoding codeword is selected among the codewords of the single codebook included in the codeword restricted subset.
  • the receiving end notifies the transmitting end of the index of the best pre-encoded codeword by means of periodic feedback and/or aperiodic feedback;
  • the transmitting end may select the same codeword restricted subset, or may select different codeword restricted subsets respectively.
  • the transmitting end selects the same codeword restricted subset, and the receiving end periodically feeds back the best precoding codeword by using the codebook sampling method. And the receiving end selects the best precoding codeword in the intersection of the codebook subset sampled according to the sampling rule and the codeword restricted subset.
  • the configuration of the codebook in the embodiment of the present invention is applied to an LTE-A system, including a transmitting end and a receiving end, where the transmitting end includes a first selecting module and a first transceiver module, and the receiving end
  • the second selection module and the second transceiver module are included, wherein:
  • the first selection module is configured to select a codeword restriction subset and notify the first transceiver module;
  • the codeword restriction subset includes a partial codeword or all codewords in the first codebook and/or the second codebook. ;
  • the first transceiver module is configured to notify the receiving end of the selected subset of codewords
  • the second transceiver module is configured to learn the selected codeword restriction subset of the transmitting end and notify the second selection module, and notify the transmitting end of the index of the best precoding codeword selected by the second selection module;
  • the second selection module is configured to select an optimal precoding codeword within the codeword restricted subset, and inform the second transceiver module of an index of the best precoding codeword.
  • the first selection module is further configured to notify the first transceiver module of the selected subset of codewords by transmitting a restricted subset bitmap to the first transceiver module;
  • the first transceiver module is further configured to send a message carrying a restricted subset bitmap to the receiving end Let, inform the receiving end of the selected subset of codeword restrictions;
  • Each information bit in the restricted subset bitmap is associated with a codeword to indicate whether the associated codeword belongs to the codeword restricted subset.
  • the first selection module is further configured to set a restricted subset bitmap by one of the following methods:
  • each codeword combination is associated with an information bit in the restricted subset bitmap, the codeword restricted subset including the codeword extracted from the first codebook and the codeword extracted from the second codebook (2) performing only a subset restriction on the codewords in the first codebook; wherein, each codeword in the first codebook is associated with one information bit in the restricted subset bitmap, the codebook
  • the restricted subset includes a codeword extracted from the first codebook and all codewords of the second codebook;
  • each codeword in the second codebook is associated with one information bit in the restricted subset bitmap, the codebook limitation
  • the subset includes a codeword extracted from the second codebook and all codewords of the first codebook;
  • the bit confinement subset includes a codeword extracted from the first codebook and a codeword extracted from the second codebook.
  • the restricted subset bitmap includes L information bits
  • the first codebook includes M codewords, and the second codebook includes N codewords.
  • the first selection module is further configured to: for the manner of periodic feedback used by the receiving end and the manner of aperiodic feedback, the transmitting end selects the same codeword restricted subset, or respectively selects different codeword restrictors. set.
  • the second selection module is further configured to: if the manner of periodic feedback and the non-periodic feedback are adopted by the receiving end, the transmitting end selects the same codeword restricted subset, and the receiving end uses the codebook sampling The method periodically feeds back the index of the best precoding codeword, and then selects the best precoding codeword in the intersection of the codebook subset sampled according to the sampling rule and the codeword restricted subset.
  • the codeword restriction subset further includes all codewords in a single codebook using only a single codebook; the second selection module is further configured to include, in the codeword restricted subset, according to a value of a transmission rank The best precoding codeword is selected from the codewords of the first codebook and the second codebook, or the best precoding codeword is selected among the codewords of the single codebook included in the codeword restriction subset.
  • the apparatus for configuring a codebook according to an embodiment of the present invention is applied to an LTE-A system, including the first selection module and the first transceiver module.
  • the invention will be further described in detail below with specific application examples.
  • the following application examples are mainly described by taking a subset restriction on the codebook codeword in the closed-loop spatial multiplexing transmission mode as an example, but are not limited to this case.
  • Application example one is mainly described by taking a subset restriction on the codebook codeword in the closed-loop spatial multiplexing transmission mode as an example, but are not limited to this case.
  • the transmitting base station and the receiving end user equipment are configured with multiple antennas, and the base station transmits information to the UE by using a precoding-based closed-loop spatial multiplexing mode.
  • the base station and the UE are aware of the precoding codebook in advance, and the precoding codebook here is an enhanced dual codebook configuration.
  • the base station knows a plurality of codebook subsets (ie, codeword restricted subsets) that have been subjected to joint subset restriction on the first codebook and the second codebook, and each codebook subset includes a first codebook and a second codebook. Some or all of the codewords.
  • the base station selects one of the codebook subsets by some mechanism and notifies the UE to limit the codebook in the subset by performing high-level signaling, for example, by radio resource control (RRC) signaling, when performing optimal precoding codeword selection. Search and select, and then feed back the selected best precoding codeword index back to the transmitter.
  • RRC radio resource control
  • the first codebook and the second codebook which are known in advance by the base station and the UE, are in the form of a codebook as shown in Table 1.
  • the size of the first codebook is 3 bits, and the size of the second codebook is 2 bits.
  • each codeword combination is associated with one information bit in the restricted subset bitmap.
  • the bitmaps are arranged in a sequence of bits. form. A value of 1 in the bitmap indicates that the associated codeword is selected in the restricted subset. A value of 0 in the information bit indicates that the associated codeword is not selected in the restricted subset. At this time, the relationship between the bitmap and the codeword index is as shown in Table 2.
  • the method for performing joint subset restriction on the codewords in the first codebook and the second codebook, and the UE is required to inform the UE of the number of information bits or the number of bits of the restricted subset bitmap of the selected codeword restricted subset.
  • Table 2 The association between the bitmap and the codeword index in the first subset of the first codebook and the second codebook
  • a transmitting base station and a receiving end user equipment are configured with multiple antennas, and the base station transmits information to the UE by using a precoding-based closed-loop spatial multiplexing mode.
  • the base station and the UE are aware of the precoding codebook in advance, and the precoding codebook here is an enhanced dual codebook configuration.
  • a plurality of codebook subsets ie, codeword restricted subsets
  • each codebook subset includes a codeword extracted from the first codebook and a second All codewords of the codebook.
  • the base station selects one of the codebook subsets by some mechanism and notifies the UE to limit the codebook in the subset by performing high-level signaling, for example, by radio resource control (RRC) signaling, when performing optimal precoding codeword selection. Search and select, and then feed back the selected best precoding codeword index back to the transmitter.
  • RRC radio resource control
  • the first codebook and the second codebook which are known in advance by the base station and the UE, are still in the form of a codebook as shown in Table 1.
  • the size of the first codebook is 3 bits
  • the size of the second codebook is 2 bits.
  • each codeword in the first codebook is associated with one information bit in the restricted subset bitmap.
  • Bitmaps are arranged in a bit sequence ⁇ -! ,...," “ “!, “. form.
  • the value of the information bit in the bitmap indicates that the associated codeword is selected in the restricted subset.
  • the value of the information bit is 0, indicating that the associated codeword is not selected in the restricted subset.
  • Table 3 The relationship between the bitmap and the codeword index is shown in Table 3.
  • Table 3 is only related to the first codebook, and the association between the bitmap and the codeword index is restricted.
  • the transmitting base station and the receiving end user equipment are configured with multiple antennas, and the base station transmits information to the UE by using a precoding-based closed-loop spatial multiplexing mode.
  • the base station and the UE are aware of the precoding codebook in advance, and the precoding codebook here is an enhanced dual codebook configuration.
  • a plurality of codebook subsets ie, a codeword restricted subset
  • each codebook subset includes a codeword extracted from the second codebook and the first All codewords of the codebook.
  • the base station selects one of the codebook subsets by some mechanism and notifies the UE to limit the codebook in the subset by performing high-level signaling, for example, by radio resource control (RRC) signaling, when performing optimal precoding codeword selection. Search and select, and then feed back the selected best precoding codeword index back to the transmitter.
  • RRC radio resource control
  • the first codebook and the second codebook which are known in advance by the base station and the UE, are still in the form of a codebook as shown in Table 1.
  • the size of the first codebook is 3 bits
  • the size of the second codebook is 2 bits.
  • each codeword in the second codebook is associated with one information bit in the bitmap.
  • the bitmaps are arranged in a bit sequence ⁇ . form. A value of 1 in the bitmap indicates that the associated codeword is selected in the restricted subset. A value of 0 on the information bit indicates that the associated codeword is not selected in the restricted subset.
  • Table 4 The relationship between the bitmap and the codeword index is shown in Table 4.
  • the transmitting base station and the receiving end user equipment are configured with multiple antennas, and the base station transmits information to the UE by using a precoding-based closed-loop spatial multiplexing mode.
  • the base station and the UE are aware of the precoding codebook in advance, and the precoding codebook here is an enhanced dual codebook configuration.
  • a plurality of codebook subsets ie, codeword restricted subsets respectively restricted by the subset of the first codebook and the second codebook are known, and each codebook subset includes the extracted from the first codebook.
  • codeword restricted subsets respectively restricted by the subset of the first codebook and the second codebook
  • the base station selects one of the codebook subsets by some mechanism and notifies the UE to limit the codebook in the subset by performing high-level signaling, for example, by radio resource control (RRC) signaling, when performing optimal precoding codeword selection. Search and select, and then feed back the selected best precoding codeword index back to the transmitter.
  • RRC radio resource control
  • the first codebook and the second codebook which are known in advance by the base station and the UE, are still in the form of a codebook as shown in Table 1.
  • the size of the first codebook is 3 bits
  • the size of the second codebook is 2 bits.
  • each of the first codebook and the second codebook is associated with one information bit in the bitmap.
  • the bitmaps are arranged in a bit sequence ⁇ . form. A value of 1 in the bitmap indicates that the associated codeword is selected in the restricted subset. A value of 0 in the information bit indicates that the associated codeword is not selected in the restricted subset.
  • Table 5 The relationship between the bitmap and the codeword index is shown in Table 5.
  • the transmitting base station and the receiving end user equipment are configured with multiple antennas, and the base station transmits information to the UE by using a precoding-based closed-loop spatial multiplexing mode.
  • the base station and the UE are aware of the precoding codebook in advance, and the precoding codebook here is an enhanced dual codebook configuration.
  • a plurality of codebook subsets ie, codeword restricted subsets respectively restricted by the subset of the first codebook and the second codebook are known, and each codebook subset includes the extracted from the first codebook.
  • codeword restricted subsets respectively restricted by the subset of the first codebook and the second codebook
  • the base station selects one of the codebook subsets by some mechanism and notifies the UE to limit the codebook in the subset by performing high-level signaling, for example, by radio resource control (RRC) signaling, when performing optimal precoding codeword selection. Search and select, and then feed back the selected best precoding codeword index back to the transmitter.
  • RRC radio resource control
  • the UE feeds back the precoding information in a dual codebook manner; when the transmission rank is large, such as RI> 2 situation, but the present invention is not limited to this case, and the UE feeds back the precoding information in a single codebook manner.
  • the size of the first codebook in the dual codebook portion is 3 bits, and the size of the second codebook is 2 bits.
  • the codebook size of this part of the single code is 3 bits.
  • each codeword in the first codebook and the second codebook is associated with the bitmap.
  • the bitmaps are arranged in a bit sequence ⁇ . form.
  • a value of 1 in the bitmap indicates that the associated codeword is selected in the restricted subset.
  • a value of 0 in the information bit indicates that the associated codeword is not selected in the restricted subset.
  • the codebook restricted subset formed at this time includes the codeword extracted from the first codebook and the codeword extracted from the second codebook and all the codewords in the single codebook.
  • the relationship between the bitmap and the codeword index is shown in Table 7.
  • Table 7 relates the association between the bitmap and the codeword index of the subset of the first codebook and the second codebook of the dual codebook.
  • the transmitting base station and the receiving end user equipment are configured with multiple antennas, and the base station transmits information to the UE by using a precoding-based closed-loop spatial multiplexing mode.
  • the base station and the UE are aware of the precoding codebook in advance, and the precoding codebook here is an enhanced dual codebook configuration.
  • a plurality of codebook subsets ie, codeword restricted subsets respectively restricted by the subset of the first codebook and the second codebook are known, and each codebook subset includes the extracted from the first codebook.
  • a codeword and a codeword extracted from the second codebook are known.
  • the base station selects one of the codebook subsets by some mechanism and carries the restricted subset bitmap
  • RRC radio resource control
  • the precoded codeword index is fed back to the transmitting end.
  • the UE may use the feedback type of periodic feedback or aperiodic feedback to perform feedback of precoding information to the base station.
  • the base station may select a codebook subset A to perform codeword restriction on periodic feedback and aperiodic feedback through a certain mechanism, that is, the periodic feedback and the aperiodic feedback use the same Bitmap information; or for periodic feedback and aperiodic feedback, the base station selects different codebook subsets A and B by certain mechanisms to perform codeword restriction on periodic feedback and aperiodic feedback, that is, periodic feedback and Acyclic feedback uses different bitmap information.
  • the base station selects the codebook subset A to perform codeword restriction on periodic feedback and aperiodic feedback.
  • the physical uplink control channel (PUCCH) of the periodic feedback bearer is limited by the signaling overhead
  • the method of sampling the codeword in the codebook is generally used to control the overhead of the feedback signaling, and sampling according to the sampling rule.
  • the latter codebook subset is C. Therefore, at this time, the codebook subsets A and C for performing the codeword search on the periodic feedback UE are simultaneously determined to be AAC.
  • the first codebook and the second codebook which are known in advance by the base station and the UE, are in the form of a codebook as shown in Table 1.
  • the relationship between the bitmap and the codeword index is as shown in Table 5.
  • the codeword search is performed in subset B.
  • Table 8 The first codebook and the second codebook after sampling the codebook of Table 1
  • the codeword restriction in the case of dual codebook is implemented in the LTE-A system, the computational complexity of the receiving end when performing codeword selection is reduced, and the error selection of the codeword by the receiving end is reduced, and Good inheritance of the signaling structure in LTE.

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Abstract

本发明公开了一种码本的配置方法、装置和系统。所述方法包括:发射端选定码字限制子集,并告知接收端;所述码字限制子集包括第一码本和/或第二码本中的部分码字或全部码字;所述接收端在所述码字限制子集内选择最佳预编码码字,并将所述最佳预编码码字的索引告知发射端。通过本发明,在高级长期演进(LTE-A)系统中实现对于双码本情况下进行码字限制,减小接收端在进行码字选择时的计算复杂度和减少接收端错误选择码字的情况,并能够很好的继承LTE中的信令结构。

Description

一种码本的配置方法、 装置和系统
技术领域
本发明涉及移动通信技术领域, 特别是涉及一种码本的配置方法、 装置 和系统。
背景技术
无线通信系统中, 在发射端和接收端都使用多根天线从而釆用空间复用 的方式来获取更高的速率。 由于在接收端可以通过信道估计来获取发射信号 所经历的信道矩阵, 因此即使各天线发射不同的数据, 经过多输入多输出 ( Multiple-Input Multiple-Out-put, MIMO )的信道矩阵后, 在接收端仍然能够 解出各天线上的发射数据。
相对于利用信道矩阵直接解出各天线上的发射数据的方法, 一种简单有 效的手段是使用预编码技术。 当发射端掌握信道状况时, 预编码技术可以根 据需要等效地改变信道转移矩阵。发射端通过对层上的数据进行预编码处理, 映射到天线后再经过无线信道发送到接收端。 如果在发射端能够知道准确的 信道状态信息(CSI ) , 就可以对具体的信道矩阵进行奇异值分解。 然后把信 道矩阵分解出的右奇异矩阵作为预编码矩阵, 进而对各层的数据进行预编码 操作。 然而 CSI往往只有在接收端才能直接准确地获取, 在发射端想要获取 CSI只能通过接收端向发射端进行 CSI信息的反馈。 在实际的系统中, 如果 直接反馈 CSI, 其代价是巨大的, 也会受到实际系统反馈开销的限制, 因此 通常釆取的方法是基于码本(codebook ) 的反馈。 即在接收端根据当前信道 状况在码本中选择合适的码字并将其在码本集合中的索引值反馈回发射端, 这样就可以大大降低反馈量。
基于码本的预编码是信道量化的一种形式。 假设有限反馈信道容量为
^ bps/Hz, 那么可用的码字的个数为 = 2^个。 信道矩阵的特征矢量空间经 过量化构成码本空间 ^ = , … }。 发射端与接收端共同保存或实时产生 此码本 (发射端和收收端相同 )。 以长期演进(Long Term Evolution, LTE ) 系统釆用的预编码技术为例, 接收端根据一定准则从码本空间 中选择一个 最佳的码字 并将该码字 ^的索引 推荐给发射端。 这里, 码字索引称为码 本中的预编码矩阵指示符( Precoding Matrix Indicator, 简称为 PMI ) 。 发射 端可以直接根据此索引 7'找到相应的预编码码字 ^进行发射,也可以不接受接 收端推荐的码字而是自己直接选择码字进行发射。 发射过程中会将实际使用 的码字索引通知给接收端。
高级长期演进(Long Term Evolution Advanced, 简称为 LTE-A ) 系统作 为 LTE的演进标准, 支持更大的系统带宽 (最高可达 100MHz ) , 并后向兼 容 LTE现有的标准。为了提高小区边缘的覆盖和吞吐量, LTE-A在现有的 LTE 系统的基础上, 下行支持高达 8天线 8层的传输, 并提出了一些反馈增强的 技术。 主要是增强码本的反馈精度, 该技术能够提高演进的国际移动通信 ( International Mobile Telecommunications-Advance , 简称为 IMT-Advance )系 统的频谱利用率、 緩解频谱资源紧缺。 目前对于增强的反馈技术在 3GPP RAN1组的会议上达成的共识为:
1 )一个子带的预编码 /反馈结构由两个矩阵组成。
2 )两个矩阵中的每一个矩阵都隶属于一个单独的码本。码本是由基站和 用户设备(UE ) 同时预先知道的。 码本可以在不同的时间和不同的子带上有 所变化。
3 )一个矩阵表示宽带或者长时信道的属性。 另一个矩阵表示确定频带上 或者短时信道的属性。 4 )所使用的矩阵码本以有限可数矩阵集的形式表示, 并且对 UE和基站 而言, 每个矩阵都是可知的。 从这里, 我们可以看出, 信道信息的反馈方面提出了一种基于双码本的 结构, 进一步的可以描述为: 对于需要反馈信道信息的一个子带或多个联合 子带, UE向基站反馈至少两个 PMI信息, 分别为 PMI1和 PMI2, 其中 PMI1 对应一个码本 C1中的码字 Wl , PMI2对应另外一个码本 C2中的码字 W2。 基站端有相同的 C1和 C2的信息,收到 PMI1和 PMI2后从对应的码本 C1和 C2中找到对应的码字 W1和 W2, 并根据约定的函数规则 F ( Wl , W2 )获 得信道信息。 码本大小通常决定了信令开销, 而码本越大一般越能获得更好的性能, 因此在码本设计时通常考虑了性能和开销的折中。 在实际的码本设计时, 通 常是考虑了多种因素, 比如适合尽可能多的信道环境和天线配置方式。 因此 在某种特定的传输情况下, 码本中的所有码字不一定都适合当前的特定传输 情况, 但对于接收端进行码字选择的时候, 却需要遍历码本中所有的码字。 这样不仅会带来接收端计算复杂度的增加, 而且还会因为某些非理想的过程 造成接收端错误选择码字的情况增加, 尤其在码本设计的比较大的情况下。
发明内容
本发明要解决的技术问题就是提出一种码本的配置方法、 装置和系统, 以减小接收端在进行码字选择时的计算复杂度并减少接收端错误选择码字的 情况。
为了解决上述技术问题, 本发明提供一种码本的配置方法, 应用于高级 长期演进(LTE-A ) 系统中, 所述方法包括:
发射端选定码字限制子集, 并告知接收端; 所述码字限制子集包括第一 码本和 /或第二码本中的部分码字或全部码字; 以及
所述接收端在所述码字限制子集内选择最佳预编码码字, 并将所述最佳 预编码码字的索引告知发射端。
优选地, 所述方法还可具有以下特点:
在发射端选定码字限制子集, 并告知接收端的步骤中, 所述发射端通过 高层信令, 将选定的码字限制子集告知接收端。
优选地, 所述方法还可具有以下特点:
在发射端选定码字限制子集, 并告知接收端的步骤中, 所述发射端通过 向接收端发送携带限制子集位图的信令,将选定的码字限制子集告知接收端; 其中, 所述限制子集位图中的每个信息位和码字相关联, 用于表示相关 联的码字是否属于所述码字限制子集。
优选地, 所述方法还可具有以下特点:
在发射端选定码字限制子集, 并告知接收端的步骤中, 所述发射端通过 如下方式之一设置限制子集位图:
( 1 )对第一码本和第二码本中的码字进行联合子集限制; 其中, 将第一 码本中的一个码字和第二码本中的一个码字作为一种码字组合, 每种码字组 合与限制子集位图中的一个信息位相关联, 所述码字限制子集包括从第一码 本中抽取的码字和从第二码本中抽取的码字;
( 2 )仅对第一码本中的码字进行子集限制; 其中, 将第一码本中的每个 码字与限制子集位图中的一个信息位相关联, 所述码本限制子集包括从第一 码本中抽取的码字和第二码本的全部码字;
( 3 )仅对第二码本中的码字进行子集限制; 其中, 将第二码本中的每个 码字与限制子集位图中的一个信息位相关联, 所述码本限制子集包括从第二 码本中抽取的码字和第一码本的全部码字;
( 4 )对第一码本和第二码本中码字分别进行子集限制; 其中, 将第一码 本和第二码本中的每个码字与限制子集位图中的一个信息位相关联, 所述码 字限制子集包括从第一码本中抽取的码字和从第二码本中抽取的码字。
优选地, 所述方法还可具有以下特点:
所述限制子集位图中包含 L个信息位;
当对第一码本和第二码本中的码字进行联合子集限制时, L = 2M+N ; 当仅对第一码本中的码字进行子集限制时, L = 2M ;
当仅对第二码本中的码字进行子集限制时, L = 2N ; 当对第一码本和第二码本中码字分别进行子集限制时, L = 2M + 2N ; 其中, 所述第一码本包含 M个码字, 第二码本包含 N个码字。
优选地, 所述方法还可具有以下特点:
所述码字限制子集还包括只使用单码本情况下单码本中的全部码字; 在所述接收端在所述码字限制子集内选择最佳预编码码字, 并将所述最 佳预编码码字的索引告知发射端的步骤中, 所述接收端根据传输秩的值, 在 所述码字限制子集所包含的第一码本和第二码本的码字中选择最佳预编码码 字, 或者, 在所述码字限制子集所包含的单码本的码字中选择最佳预编码码 字。
优选地, 所述方法还可具有以下特点:
所述接收端釆用周期反馈的方式和 /或非周期反馈的方式将所述最佳预 编码码字的索引告知发射端;
在发射端选定码字限制子集, 并告知接收端的步骤中, 针对接收端釆用 的周期反馈的方式和非周期反馈的方式, 发射端选择相同的码字限制子集, 或者分别选定不同的码字限制子集。
为了解决上述技术问题, 本发明提供一种码本的配置装置, 包括第一选 择模块和第一收发模块, 其中: 所述第一选择模块设置为: 选定码字限制子集并告知第一收发模块; 所 述码字限制子集包括第一码本和 /或第二码本中的部分码字或全部码字; 所述第一收发模块设置为: 将选定的码字限制子集告知接收端。
优选地, 所述装置还可具有以下特点:
所述第一选择模块是设置为: 通过向第一收发模块发送限制子集位图 , 将选定码字限制子集告知第一收发模块;
所述第一收发模块是设置为: 通过向接收端发送携带限制子集位图的信 令, 将选定的码字限制子集告知接收端;
其中, 所述限制子集位图中的每个信息位和码字相关联, 用于表示相关 联的码字是否属于所述码字限制子集。
优选地, 所述装置还可具有以下特点:
所述第一选择模块是设置为: 通过如下方式之一设置限制子集位图:
( 1 )对第一码本和第二码本中的码字进行联合子集限制; 其中, 将第一 码本中的一个码字和第二码本中的一个码字作为一种码字组合, 每种码字组 合与限制子集位图中的一个信息位相关联, 所述码字限制子集包括从第一码 本中抽取的码字和从第二码本中抽取的码字;
( 2 )仅对第一码本中的码字进行子集限制; 其中, 将第一码本中的每个 码字与限制子集位图中的一个信息位相关联, 所述码本限制子集包括从第一 码本中抽取的码字和第二码本的全部码字;
( 3 )仅对第二码本中的码字进行子集限制; 其中, 将第二码本中的每个 码字与限制子集位图中的一个信息位相关联, 所述码本限制子集包括从第二 码本中抽取的码字和第一码本的全部码字; ( 4 )对第一码本和第二码本中码字分别进行子集限制; 其中, 将第一码 本和第二码本中的每个码字与限制子集位图中的一个信息位相关联, 所述码 字限制子集包括从第一码本中抽取的码字和从第二码本中抽取的码字。
优选地, 所述装置还可具有以下特点: 所述第一选择模块还设置为: 所述限制子集位图中包含 L个信息位;
当对第一码本和第二码本中的码字进行联合子集限制时, L = 2M+N ; 当仅对第一码本中的码字进行子集限制时, L = 2M ;
当仅对第二码本中的码字进行子集限制时, L = 2N ; 当对第一码本和第二码本中码字分别进行子集限制时, L = 2M + 2N; 其中, 所述第一码本包含 M个码字, 第二码本包含 N个码字。
优选地, 所述装置还可具有以下特点:
所述第一选择模块还设置为: 针对接收端釆用的周期反馈的方式和非周 期反馈的方式, 发射端选择相同的码字限制子集, 或者分别选定不同的码字 限制子集。
为了解决上述技术问题, 本发明提供一种码本的配置系统, 包括发射端 和接收端, 所述发射端包括上述的配置装置, 所述接收端包括第二选择模块 和第二收发模块, 其中:
所述第二收发模块设置为: 获知发射端所选定的码字限制子集并告知第 二选择模块, 以及, 将第二选择模块选择的最佳预编码码字的索引告知发射 端;
所述第二选择模块设置为:在所述码字限制子集内选择最佳预编码码字, 并将所述最佳预编码码字的索引告知所述第二收发模块。 通过本发明, 在 LTE-A系统中实现对于双码本情况下进行码字限制, 减 小接收端在进行码字选择时的计算复杂度和减少接收端错误选择码字的情 况, 并能够很好的继承 LTE中的信令结构。
附图概述
图 1是本发明实施例的码本的配置方法流程图;
图 2是本发明实施例的码本的配置系统示意图。
本发明的较佳实施方式
本发明针对双码本码字进行子集限制, 以减小接收端在进行码字选择时 的计算复杂度。 本发明支持实际应用中系统根据需要自定义码本, 自定义的 码本(称为码字限制子集)为当前使用的进行信道信息量化的码本, 其中包 括标准定义的码本中的全部或部分码字, 或者包括标准中定义的全部或部分 码字和一个或多个传输秩, 或者包括码字和传输秩的组合。 我们称这种自定 义码本的功能为码书限制功能,码字限制子集可由高层信令进行通知接收端。 接收端被告知子集限制的具体配置后, 将在码字限制子集的码字中进行最佳 预编码码字的选择。
具体地,如图 1所示,本发明实施例的码本的配置方法,可应用于 LTE-A 系统, 包括:
步骤 101 , 发射端选定码字限制子集, 并告知接收端; 所述码字限制子 集包括第一码本和 /或第二码本中的部分码字或全部码字;
步骤 102, 所述接收端在所述码字限制子集内选择最佳预编码码字, 并 将所述最佳预编码码字的索引告知发射端。
其中, 所述发射端和接收端预先已知所述第一码本和第二码本中的全部 码字, 发射端已知多个对第一码本和第二码本进行了码字限制的子集, 即码 字限制子集。
发射端可通过高层信令(比如无线资源控制 (Radio Resource Control, RRC )信令) , 将选定的码字限制子集告知接收端。 具体地, 发射端可通过向接收端发送携带限制子集位图 (bitmap ) 的信 令, 将选定的码字限制子集告知接收端;
其中,所述限制子集位图可以指定接收端所有可能使用的码字限制子集, 限制子集位图中的每个信息位和码字相关联, 用于表示相关联的码字是否属 于所述码字限制子集。 比如, 当信息位的值为 1时代表关联的码字被选中在 码字限制子集中, 信息位的值为 0则代表关联的码字未被选中在码字限制子 集中。
进一步地, 发射端可通过如下方式之一设置限制子集位图, 进行子集限 制:
( 1 )对第一码本和第二码本中的码字进行联合子集限制; 其中, 将第一 码本中的一个码字和第二码本中的一个码字作为一种码字组合, 每种码字组 合与限制子集位图中的一个信息位相关联, 所述码字限制子集包括从第一码 本中抽取的码字和从第二码本中抽取的码字;
( 2 )仅对第一码本中的码字进行子集限制; 其中, 将第一码本中的每个 码字与限制子集位图中的一个信息位相关联, 所述码本限制子集包括从第一 码本中抽取的码字和第二码本的全部码字;
( 3 )仅对第二码本中的码字进行子集限制; 其中, 将第二码本中的每个 码字与限制子集位图中的一个信息位相关联, 所述码本限制子集包括从第二 码本中抽取的码字和第一码本的全部码字; ( 4 )对第一码本和第二码本中码字分别进行子集限制; 其中, 将第一码 本和第二码本中的每个码字与限制子集位图中的一个信息位相关联, 所述码 字限制子集包括从第一码本中抽取的码字和从第二码本中抽取的码字。
其中, 所述限制子集位图中包含 L个信息位(即 L比特) , 所述第一码 本包含 M个码字, 第二码本包含 N个码字 (即第一码本的大小为 M比特, 第二码本的大小为 N比特) ;
当对第一码本和第二码本中的码字进行联合子集限制时, L = 2M+N ; 当仅对第一码本中的码字进行子集限制时, L = 2M ;
当仅对第二码本中的码字进行子集限制时, L = 2N ; 当对第一码本和第二码本中码字分别进行子集限制时, L = 2M + 2N。 上述码字限制子集还可包括只使用单码本情况下单码本中的全部码字; 所述接收端可根据传输秩的值, 在所述码字限制子集所包含的第一码本 和第二码本的码字中选择最佳预编码码字, 或者, 在所述码字限制子集所包 含的单码本的码字中选择最佳预编码码字。
所述接收端釆用周期反馈的方式和 /或非周期反馈的方式将所述最佳预 编码码字的索引告知发射端;
针对接收端釆用的周期反馈的方式和非周期反馈的方式, 发射端可选择 相同的码字限制子集, 也可以分别选定不同的码字限制子集。
针对接收端釆用的周期反馈的方式和非周期反馈的方式, 若发射端选择 相同的码字限制子集, 且接收端釆用码本抽样的方法周期性反馈所述最佳预 编码码字的索引, 则所述接收端在根据抽样规则进行抽样后的码本子集和所 述码字限制子集的交集内选择最佳预编码码字。
如图 2所示, 本发明实施例的码本的配置系统, 应用于 LTE-A系统, 包 括发射端和接收端, 所述发射端包括第一选择模块和第一收发模块, 所述接 收端包括第二选择模块和第二收发模块, 其中:
所述第一选择模块用于选定码字限制子集并告知第一收发模块; 所述码 字限制子集包括第一码本和 /或第二码本中的部分码字或全部码字;
所述第一收发模块用于将选定的码字限制子集告知接收端;
所述第二收发模块用于获知发射端所选定的码字限制子集并告知第二选 择模块, 以及, 将第二选择模块选择的最佳预编码码字的索引告知发射端; 所述第二选择模块用于在所述码字限制子集内选择最佳预编码码字, 并 将所述最佳预编码码字的索引告知所述第二收发模块。
优选地, 所述第一选择模块进一步用于通过向第一收发模块发送限制子 集位图, 将选定码字限制子集告知第一收发模块;
所述第一收发模块进一步用于通过向接收端发送携带限制子集位图的信 令, 将选定的码字限制子集告知接收端;
其中, 所述限制子集位图中的每个信息位和码字相关联, 用于表示相关 联的码字是否属于所述码字限制子集。
优选地, 所述第一选择模块进一步用于通过如下方式之一设置限制子集 位图:
( 1 )对第一码本和第二码本中的码字进行联合子集限制; 其中, 将第一 码本中的一个码字和第二码本中的一个码字作为一种码字组合, 每种码字组 合与限制子集位图中的一个信息位相关联, 所述码字限制子集包括从第一码 本中抽取的码字和从第二码本中抽取的码字; ( 2 )仅对第一码本中的码字进行子集限制; 其中, 将第一码本中的每个 码字与限制子集位图中的一个信息位相关联, 所述码本限制子集包括从第一 码本中抽取的码字和第二码本的全部码字;
( 3 )仅对第二码本中的码字进行子集限制; 其中, 将第二码本中的每个 码字与限制子集位图中的一个信息位相关联, 所述码本限制子集包括从第二 码本中抽取的码字和第一码本的全部码字;
( 4 )对第一码本和第二码本中码字分别进行子集限制; 其中, 将第一码 本和第二码本中的每个码字与限制子集位图中的一个信息位相关联, 所述码 字限制子集包括从第一码本中抽取的码字和从第二码本中抽取的码字。
优选地, 所述限制子集位图中包含 L个信息位;
当对第一码本和第二码本中的码字进行联合子集限制时, L = 2M+N ; 当仅对第一码本中的码字进行子集限制时, L = 2M ;
当仅对第二码本中的码字进行子集限制时, L = 2N ; 当对第一码本和第二码本中码字分别进行子集限制时, L = 2M + 2N; 其中, 所述第一码本包含 M个码字, 第二码本包含 N个码字。
优选地, 所述第一选择模块进一步用于针对接收端釆用的周期反馈的方 式和非周期反馈的方式, 发射端选择相同的码字限制子集, 或者分别选定不 同的码字限制子集。 优选地, 所述第二选择模块进一步用于: 若针对接收端釆用的周期反馈 的方式和非周期反馈的方式, 发射端选择相同的码字限制子集, 且接收端釆 用码本抽样的方法周期性反馈所述最佳预编码码字的索引, 则在根据抽样规 则进行抽样后的码本子集和所述码字限制子集的交集内选择最佳预编码码 字。
所述码字限制子集还包括只使用单码本情况下单码本中的全部码字; 所 述第二选择模块进一步用于根据传输秩的值, 在所述码字限制子集所包含的 第一码本和第二码本的码字中选择最佳预编码码字, 或者, 在所述码字限制 子集所包含的单码本的码字中选择最佳预编码码字。
本发明实施例的码本的配置装置, 应用于 LTE-A系统, 包括上述的第一 选择模块和第一收发模块。 下面以具体的应用示例进一步详细说明本发明。 下述应用示例主要以闭 环空间复用传输模式下的对码本码字进行子集限制为例来阐述, 但不限于这 种情况。 应用示例一
在 LTE-A系统中, 发射端基站和接收端用户设备 ( UE ) 配置多根天线, 基站釆用基于预编码的闭环空间复用模式向 UE发送信息。基站和 UE是预先 知道预编码码本的, 这里的预编码码本是增强的双码本配置。 基站知道多个 对第一码本和第二码本进行了联合子集限制的码本子集 (即码字限制子集), 每个码本子集包括第一码本和第二码本的部分或全部码字。 基站通过某种机 制选定其中的一个码本子集并通过高层信令, 例如通过无线资源控制(RRC ) 信令通知 UE在进行最佳预编码码字选择时将码本限制在该子集中进行搜索 和选择, 然后将选定的最佳预编码码字索引反馈回发射端。
假设基站和 UE预先知道的第一码本和第二码本釆用如表 1的码本构成 形式。 其中第一码本的大小为 3比特, 第二码本的大小为 2比特。 某种天线配置下的第一码本和第二码本
Figure imgf000014_0001
釆用对第一码本和第二码本中的码字进行联合子集限制的方法时, 将第 一码本中的一个码字和第二码本中的一个码字作为一种码字组合, 每种码字 组合关联限制子集位图中的一个信息位。位图排列成比特序列 。 的形式。 位图中信息位的值为 1时代表关联的码字被选中在限制的子集中, 信息位的值为 0则代表关联的码字未被选中在限制的子集中。 此时, 位图与 码字索引的关联关系如表 2所示。
釆用对第一码本和第二码本中的码字进行联合子集限制的方法, 所需告 知 UE 所选用的码字限制子集的限制子集位图的信息位数或者说比特数为
L = 23+2 = 32。
表 2 第一码本和第二码本联合子集限制下位图与码字索引的关联关系
Figure imgf000014_0002
2 0 6 0
2 1 a9 6 1
2 2 6 2
2 3 6 3 ,
3 0 7 0
3 1 7 1
3 2 7 2
3 3 7 3
应用示例二 在 LTE-A系统中, 发射端基站和接收端用户设备 ( UE ) 配置多根天线, 基站釆用基于预编码的闭环空间复用模式向 UE发送信息。基站和 UE是预先 知道预编码码本的, 这里的预编码码本是增强的双码本配置。 基站处知道多 个仅对第一码本进行了子集限制的码本子集(即码字限制子集) , 每个码本 子集包括从第一码本中抽取的码字和第二码本的全部码字。 基站通过某种机 制选定其中的一个码本子集并通过高层信令, 例如通过无线资源控制(RRC ) 信令通知 UE在进行最佳预编码码字选择时将码本限制在该子集中进行搜索 和选择, 然后将选定的最佳预编码码字索引反馈回发射端。
假设基站和 UE预先知道的第一码本和第二码本仍釆用如表 1的码本构 成形式。 其中第一码本的大小为 3比特, 第二码本的大小为 2比特。
釆用仅对第一码本中的码字进行子集限制的方法时, 将第一码本中的每 个码字都关联限制子集位图中的一个信息位。 位图排列成比特序列 ^-!,…," " "!, "。的形式。位图中信息位的值为 i时代表关联的码字被选中在限 制的子集中, 信息位的值为 0则代表关联的码字未被选中在限制的子集中。 此时位图与码字索引的关联关系如表 3所示。
13 表 3 仅对第一码本进行子集限制下位图与码字索引的关联关系
Figure imgf000016_0001
釆用仅对第一码本进行码字子集限制的方法, 所需告知 UE所选用的码 字限制子集的限制子集位图的信息位数或者说比特数为 L = 23 = 8。
应用示例三
在 LTE-A系统中, 发射端基站和接收端用户设备 ( UE ) 配置多根天线, 基站釆用基于预编码的闭环空间复用模式向 UE发送信息。基站和 UE是预先 知道预编码码本的, 这里的预编码码本是增强的双码本配置。 基站处知道多 个仅对第二码本进行了子集限制的码本子集(即码字限制子集) , 每个码本 子集包括从第二码本中抽取的码字和第一码本的全部码字。 基站通过某种机 制选定其中的一个码本子集并通过高层信令, 例如通过无线资源控制(RRC ) 信令通知 UE在进行最佳预编码码字选择时将码本限制在该子集中进行搜索 和选择, 然后将选定的最佳预编码码字索引反馈回发射端。
假设基站和 UE预先知道的第一码本和第二码本仍釆用如表 1的码本构 成形式。 其中第一码本的大小为 3比特, 第二码本的大小为 2比特。
釆用仅对第二码本中的码字进行子集限制的方法时, 将第二码本中的每 个码字都关联位图中的一个信息位。位图排列成比特序列 α。的形 式。 位图中信息位的值为 1时代表关联的码字被选中在限制的子集中, 信息 位的值为 0则代表关联的码字未被选中在限制的子集中。 此时位图与码字索 引的关联关系如表 4所示。
釆用仅对第二码本进行码字子集限制的方法, 所需告知 UE所选用的码 字限制子集的限制子集位图的信息位数或者说比特数为 L = 22 = 4。 表 4 仅对第二码本进行子集限制下位图与码字索引的关联关系
Figure imgf000017_0001
应用示例四
在 LTE-A系统中, 发射端基站和接收端用户设备 ( UE ) 配置多根天线, 基站釆用基于预编码的闭环空间复用模式向 UE发送信息。基站和 UE是预先 知道预编码码本的, 这里的预编码码本是增强的双码本配置。 基站处知道多 个对第一码本和第二码本分别进行了子集限制的码本子集 (即码字限制子 集) , 每个码本子集包括从第一码本中抽取的码字和从第二码本中抽取的码 字。 基站通过某种机制选定其中的一个码本子集并通过高层信令, 例如通过 无线资源控制 (RRC )信令通知 UE在进行最佳预编码码字选择时将码本限 制在该子集中进行搜索和选择, 然后将选定的最佳预编码码字索引反馈回发 射端。
假设基站和 UE预先知道的第一码本和第二码本仍釆用如表 1的码本构 成形式。 其中第一码本的大小为 3比特, 第二码本的大小为 2比特。
釆用对第一码本和第二码本中码字分别进行子集限制的方法时, 将第一 码本和第二码本中的每个码字都关联到位图中的一个信息位。 位图排列成比 特序列 α。的形式。位图中信息位的值为 1时代表关联的码字被选 中在限制的子集中, 信息位的值为 0则代表关联的码字未被选中在限制的子 集中。 此时位图与码字索引的关联关系如表 5所示。
釆用对第一码本和第二码本中码字分别进行子集限制的方法, 所需告知 UE 所选用的码字限制子集的限制子集位图的信息位数或者说比特数为 L = 23 +22 =12。 表
联关系
Figure imgf000018_0001
应用示例五
在 LTE-A系统中, 发射端基站和接收端用户设备 ( UE ) 配置多根天线, 基站釆用基于预编码的闭环空间复用模式向 UE发送信息。基站和 UE是预先 知道预编码码本的, 这里的预编码码本是增强的双码本配置。 基站处知道多 个对第一码本和第二码本分别进行了子集限制的码本子集 (即码字限制子 集) , 每个码本子集包括从第一码本中抽取的码字和从第二码本中抽取的码 字。 基站通过某种机制选定其中的一个码本子集并通过高层信令, 例如通过 无线资源控制 (RRC )信令通知 UE在进行最佳预编码码字选择时将码本限 制在该子集中进行搜索和选择, 然后将选定的最佳预编码码字索引反馈回发 射端。
假设基站和 UE预先知道的双码本构成釆用如下的方法:
当传输秩(RI )较低时, 比如 RI=1或 RI=2的情况, 但不限于此情况, UE釆用双码本的方式反馈预编码信息; 当传输秩较大时, 比如 RI>2的情况, 但不限于此情况, UE釆用单码本的方式反馈预编码信息。其中双码本部分第 一码本的大小为 3比特, 第二码本的大小为 2比特。 单码本部分的码本大小 为 3比特。
本例中釆用如表 6的码本构成形式。
某种天线配置下的码本
Figure imgf000019_0001
釆用对双码本部分第一码本和第二码本中码字分别进行子集限制的方法 时, 将第一码本和第二码本中的每个码字都关联到位图中的一个信息位。 位 图排列成比特序列 α。的形式。位图中信息位的值为 1时代表关联 的码字被选中在限制的子集中, 信息位的值为 0则代表关联的码字未被选中 在限制的子集中。
这里需要说明的是, 由于在高传输秩时釆用了单码本的情况, 在进行码 本子集限制时仅对双码本的码本部分进行子集限制, 单码本部分不再进行限 制。 因此, 此时所组成的码本限制子集包括从第一码本中抽取的码字和从第 二码本中抽取的码字以及单码本中的全部码字。 此时位图与码字索引的关联关系如表 7所示。
釆用对第一码本和第二码本中码字分别进行子集限制的方法, 所需告知 UE 所选用的码字限制子集的限制子集位图的信息位数或者说比特数为 L = 23 + 22 = 12。
表 7 对双码本部分的第一码本和第二码本分别进行子集限制下位图与 码字索引的关联关系
Figure imgf000020_0001
应用示例六
在 LTE-A系统中, 发射端基站和接收端用户设备 ( UE ) 配置多根天线, 基站釆用基于预编码的闭环空间复用模式向 UE发送信息。基站和 UE是预先 知道预编码码本的, 这里的预编码码本是增强的双码本配置。 基站处知道多 个对第一码本和第二码本分别进行了子集限制的码本子集 (即码字限制子 集) , 每个码本子集包括从第一码本中抽取的码字和从第二码本中抽取的码 字。 基站通过某种机制选定其中的一个码本子集并通过携带限制子集位图
( bitmap )的高层信令, 例如通过无线资源控制( RRC )信令通知 UE在进行 最佳预编码码字选择时将码本限制在该子集中进行搜索和选择, 然后将选定 的最佳预编码码字索引反馈回发射端。 UE可以釆用周期性反馈或者非周期性 反馈两种反馈类型向基站进行预编码信息的反馈。
其中, 对于周期性反馈和非周期性反馈, 基站可以通过某种机制选择码 本子集 A对周期性反馈和非周期性反馈进行码字限制, 即周期性反馈和非周 期性反馈使用相同的位图信息; 或者对于周期性反馈和非周期性反馈, 基站 通过某种机制选择不同的码本子集 A和 B分别对周期性反馈和非周期性反馈 进行码字限制, 即周期性反馈和非周期性反馈使用不同的位图信息。
其中, 基站选择码本子集 A对周期性反馈和非周期性反馈进行码字限制 时, 由于周期性反馈承载的物理上行控制信道(PUCCH )受到信令开销的限 制, 通常会釆用将码本中的码字进行抽样的方法来控制反馈信令的开销, 根 据抽样规则进行抽样后的码本子集为 C。 因此, 此时对于周期性反馈 UE进 行码字搜索的码本子集 A和 C同时确定, 为 A A C。
假设基站和 UE预先知道的第一码本和第二码本釆用如表 1的码本构成 形式。 釆用对第一码本和第二码本中码字分别进行子集限制的方法, 位图与 码字索引的关联关系如表 5所示。
当周期性反馈和非周期性反馈釆用相同的码本限制子集 A时, 基站可通 过位图信息 Α= {α, , , ... , α3 , α2 , , α。 } = {0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1}通知 UE在进行周期性或 非周期性反馈时在子集 A中进行码字搜索。
当周期性反馈和非周期性反馈釆用不相同的码本限制子集时, 假设周期 性反馈釆用码本子集 A, 非周期性反馈釆用码本子集 B , 基站可通过位图信 息 Α={α„,. = {0, 0, 0, 1, 0, 0, 0, 0,1, 0, 1, 0} 和
Β= {α, , , ... , α3 , α2 , , α。 } = {0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0}通知 UE在进行周期性反馈时在子集 Α中进行码字搜索, 进行非周期性反馈时在子集 B中进行码字搜索。
当 周 期 性 反 馈 和 非 周 期 性 反 馈 使 用 相 同 的 位 图 A^{au,...,a ,a2,a„a0} = {0, 0 0, 0, 0, 0, 1, 1, 1, 1}时, 且周期性反馈釆用了对码本中的 码字进行抽样的方法, 假设周期性反馈釆用的抽样后的码本如表 8所示。 此 时由位图信息和抽样规则同时确定的 UE 进行码字搜索的码本子
Figure imgf000021_0001
{ d
表 8 对表 1码本进行抽样后的第一码本和第二码本
Figure imgf000021_0002
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 所述程序可以存储于计算机可读存储介质中, 如只读 存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
当然, 本发明还可有其它多种实施例, 在不背离本发明精神及其实质的 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用性
通过本发明, 在 LTE-A系统中实现对于双码本情况下进行码字限制, 减 小接收端在进行码字选择时的计算复杂度和减少接收端错误选择码字的情 况, 并能够很好的继承 LTE中的信令结构。

Claims

权 利 要 求 书
1、 一种码本的配置方法, 应用于高级长期演进(LTE-A ) 系统中, 所述 方法包括:
发射端选定码字限制子集, 并告知接收端; 所述码字限制子集包括第一 码本和 /或第二码本中的部分码字或全部码字; 以及
所述接收端在所述码字限制子集内选择最佳预编码码字, 并将所述最佳 预编码码字的索引告知发射端。
2、 如权利要求 1所述的方法, 其中,
在发射端选定码字限制子集, 并告知接收端的步骤中, 所述发射端通过 高层信令, 将选定的码字限制子集告知接收端。
3、 如权利要求 1所述的方法, 其中,
在发射端选定码字限制子集, 并告知接收端的步骤中, 所述发射端通过 向接收端发送携带限制子集位图的信令,将选定的码字限制子集告知接收端; 其中, 所述限制子集位图中的每个信息位和码字相关联, 用于表示相关 联的码字是否属于所述码字限制子集。
4、 如权利要求 3所述的方法, 其中,
在发射端选定码字限制子集, 并告知接收端的步骤中, 所述发射端通过 如下方式之一设置限制子集位图:
( 1 )对第一码本和第二码本中的码字进行联合子集限制; 其中, 将第一 码本中的一个码字和第二码本中的一个码字作为一种码字组合, 每种码字组 合与限制子集位图中的一个信息位相关联, 所述码字限制子集包括从第一码 本中抽取的码字和从第二码本中抽取的码字;
( 2 )仅对第一码本中的码字进行子集限制; 其中, 将第一码本中的每个 码字与限制子集位图中的一个信息位相关联, 所述码本限制子集包括从第一 码本中抽取的码字和第二码本的全部码字;
( 3 )仅对第二码本中的码字进行子集限制; 其中, 将第二码本中的每个 码字与限制子集位图中的一个信息位相关联, 所述码本限制子集包括从第二 码本中抽取的码字和第一码本的全部码字;
( 4 )对第一码本和第二码本中码字分别进行子集限制; 其中, 将第一码 本和第二码本中的每个码字与限制子集位图中的一个信息位相关联, 所述码 字限制子集包括从第一码本中抽取的码字和从第二码本中抽取的码字。
5、 如权利要求 4所述的方法, 其中,
所述限制子集位图中包含 L个信息位;
当对第一码本和第二码本中的码字进行联合子集限制时, L = 2M+N ; 当仅对第一码本中的码字进行子集限制时, L = 2M ;
当仅对第二码本中的码字进行子集限制时, L = 2N ;
当对第一码本和第二码本中码字分别进行子集限制时, L = 2M + 2N; 其中, 所述第一码本包含 M个码字, 第二码本包含 N个码字。
6、 如权利要求 1 ~ 5中任意一项所述的方法, 其中,
所述码字限制子集还包括只使用单码本情况下单码本中的全部码字; 在所述接收端在所述码字限制子集内选择最佳预编码码字, 并将所述最 佳预编码码字的索引告知发射端的步骤中, 所述接收端根据传输秩的值, 在 所述码字限制子集所包含的第一码本和第二码本的码字中选择最佳预编码码 字, 或者, 在所述码字限制子集所包含的单码本的码字中选择最佳预编码码 字。
7、 如权利要求 1 ~ 5中任意一项所述的方法, 其中,
所述接收端釆用周期反馈的方式和 /或非周期反馈的方式将所述最佳预 编码码字的索引告知发射端;
在发射端选定码字限制子集, 并告知接收端的步骤中, 针对接收端釆用 的周期反馈的方式和非周期反馈的方式, 发射端选择相同的码字限制子集, 或者分别选定不同的码字限制子集。
8、 一种码本的配置装置, 包括第一选择模块和第一收发模块, 其中: 所述第一选择模块设置为: 选定码字限制子集并告知第一收发模块; 所 述码字限制子集包括第一码本和 /或第二码本中的部分码字或全部码字; 所述第一收发模块设置为: 将选定的码字限制子集告知接收端。
9、 如权利要求 8所述的装置, 其中,
所述第一选择模块是设置为: 通过向第一收发模块发送限制子集位图, 将选定码字限制子集告知第一收发模块;
所述第一收发模块是设置为: 通过向接收端发送携带限制子集位图的信 令, 将选定的码字限制子集告知接收端;
其中, 所述限制子集位图中的每个信息位和码字相关联, 用于表示相关 联的码字是否属于所述码字限制子集。
10、 如权利要求 9所述的装置, 其中,
所述第一选择模块是设置为: 通过如下方式之一设置限制子集位图:
( 1 )对第一码本和第二码本中的码字进行联合子集限制; 其中, 将第一 码本中的一个码字和第二码本中的一个码字作为一种码字组合, 每种码字组 合与限制子集位图中的一个信息位相关联, 所述码字限制子集包括从第一码 本中抽取的码字和从第二码本中抽取的码字;
( 2 )仅对第一码本中的码字进行子集限制; 其中, 将第一码本中的每个 码字与限制子集位图中的一个信息位相关联, 所述码本限制子集包括从第一 码本中抽取的码字和第二码本的全部码字; ( 3 )仅对第二码本中的码字进行子集限制; 其中, 将第二码本中的每个 码字与限制子集位图中的一个信息位相关联, 所述码本限制子集包括从第二 码本中抽取的码字和第一码本的全部码字;
( 4 )对第一码本和第二码本中码字分别进行子集限制; 其中, 将第一码 本和第二码本中的每个码字与限制子集位图中的一个信息位相关联, 所述码 字限制子集包括从第一码本中抽取的码字和从第二码本中抽取的码字。
11、 如权利要求 10所述的装置, 其中, 所述第一选择模块还设置为: 所述限制子集位图中包含 L个信息位;
当对第一码本和第二码本中的码字进行联合子集限制时, L = 2M+N ; 当仅对第一码本中的码字进行子集限制时, L = 2M ;
当仅对第二码本中的码字进行子集限制时, L = 2N ;
当对第一码本和第二码本中码字分别进行子集限制时, L = 2M + 2N ;
其中, 所述第一码本包含 M个码字, 第二码本包含 N个码字。
12、 如权利要求 8所述的装置, 其中,
所述第一选择模块还设置为: 针对接收端釆用的周期反馈的方式和非周 期反馈的方式, 发射端选择相同的码字限制子集, 或者分别选定不同的码字 限制子集。
13、 一种码本的配置系统, 包括发射端和接收端, 所述发射端包括如权 利要求 8 ~ 12中任意一项所述的配置装置, 所述接收端包括第二选择模块和 第二收发模块, 其中:
所述第二收发模块设置为: 获知发射端所选定的码字限制子集并告知第 二选择模块, 以及, 将第二选择模块选择的最佳预编码码字的索引告知发射 端;
所述第二选择模块设置为:在所述码字限制子集内选择最佳预编码码字, 并将所述最佳预编码码字的索引告知所述第二收发模块。
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KR20120128673A (ko) 2012-11-27
CN101917365B (zh) 2015-06-03
JP2013522982A (ja) 2013-06-13
BR112012022728B1 (pt) 2021-05-11
EP2536083A1 (en) 2012-12-19
MX2012010581A (es) 2012-10-09
EP2536083A4 (en) 2017-08-23
CN101917365A (zh) 2010-12-15
US20130136203A1 (en) 2013-05-30
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EP2536083B1 (en) 2019-03-27
BR112012022728A2 (pt) 2018-06-05

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