WO2017020680A1 - Procédé de transmission de données de liaison montante, procédé de réception, et dispositif - Google Patents

Procédé de transmission de données de liaison montante, procédé de réception, et dispositif Download PDF

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Publication number
WO2017020680A1
WO2017020680A1 PCT/CN2016/089197 CN2016089197W WO2017020680A1 WO 2017020680 A1 WO2017020680 A1 WO 2017020680A1 CN 2016089197 W CN2016089197 W CN 2016089197W WO 2017020680 A1 WO2017020680 A1 WO 2017020680A1
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Prior art keywords
multiple access
orthogonal multiple
uplink data
terminal
frequency
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PCT/CN2016/089197
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English (en)
Chinese (zh)
Inventor
康绍莉
宋扬
秦飞
孙韶辉
任斌
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电信科学技术研究院
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • 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
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, a receiving method, and a device for transmitting uplink data.
  • MIMO Multiple Input Multiple Output
  • the invention provides a method, a receiving method and a device for transmitting uplink data, so as to solve the problem of how to support more users in the same cell.
  • An embodiment of the present invention provides a method for sending uplink data, including:
  • Pairing the MIMO precoded pair according to the indication of the pattern vector of the non-orthogonal multiple access Time-frequency resource mapping should be performed on the modulation symbols of each antenna port;
  • the orthogonal frequency division multiplexing OFDM symbols of each antenna port are generated and transmitted according to the modulation symbols mapped by the time-frequency resources.
  • the performing power adjustment on the non-orthogonal multiple access access pattern vector modulation symbol comprises:
  • all transport layers of all terminals use mutually orthogonal demodulation reference signals DMRS.
  • the mapping of the power vector adjusted non-orthogonal multiple access access pattern vector modulation symbols to the transport layer includes:
  • n is a maximum line of a pattern matrix not less than a non-orthogonal multiple access pattern vector of the terminal Heavy; wherein the modulation symbols of a non-orthogonal multiple access pattern vector are mapped to one or more transport layers.
  • An embodiment of the present invention provides a method for receiving uplink data, including:
  • the non-orthogonal multiple access access extended spatial-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource is reconstructed, and the multi-terminal non-orthogonal multiple access of the time-frequency resource extends the space frequency, etc.
  • the effective channel matrix is composed of a non-orthogonal multiple access extended spatial frequency equivalent channel occupying each terminal transmitting the uplink data on the time-frequency resource, and each terminal is non-orthogonal in the time-frequency resource
  • the address access extended space-frequency equivalent channel is composed of MIMO channel estimates of the plurality of frequency domain resources corresponding to the uplink data sent by the terminal in the time-frequency resource, and the plurality of frequency domain resources corresponding to the uplink data are a pattern vector indication of non-orthogonal multiple access corresponding to the uplink data;
  • Space-frequency equivalent channel matrix detection based on non-orthogonal multiple access of multi-terminal access of time-frequency resources
  • the uplink data of the transmission of the time-frequency resources by the plurality of terminals is measured.
  • the non-orthogonal multiple access extended spatial-frequency equivalent channel matrix of the multi-terminal reconstructing a time-frequency resource according to the channel estimation result includes:
  • the non-orthogonal multiple access extension extended space-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource is reconstructed according to the first spatial domain and the frequency domain.
  • the method further includes:
  • the pattern data of different non-orthogonal multiple access access is preferentially allocated to the uplink data of each terminal on the same time-frequency resource, and the uplink data of one terminal corresponds to one or more non-orthogonal multiple access accesses.
  • Pattern vector if the number of pattern vectors of non-orthogonal multiple access cannot satisfy the uplink data, assign a non-orthogonal multiple access pattern vector to the uplink data of each terminal according to at least one of the following criteria:
  • At least two terminals whose channel spatial correlation is lower than a set threshold allow transmission of uplink data using the same non-orthogonal multiple access pattern vector.
  • the non-orthogonal multiple access extended spatial-frequency equivalent channel matrix of the multi-terminal according to the time-frequency resource detects the transmission of the multiple terminals in the time-frequency resource.
  • Upstream data including:
  • Detecting by using a linear detection or a non-linear detection method, the uplink data of the plurality of terminals in the time-frequency resource according to the non-orthogonal multiple access extension extended spatial-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource, and Perform interference cancellation or iterative detection decoding.
  • An embodiment of the present invention provides an apparatus for transmitting uplink data, including:
  • the non-orthogonal multiple access code modulation module is configured to perform non-orthogonal multiple access code modulation on the uplink data that is channel coded by using a pattern vector of non-orthogonal multiple access corresponding to the uplink data.
  • a power adjustment module configured to perform power adjustment on the modulation symbol
  • a layer mapping module configured to perform transmission layer mapping on the power modulated modulation symbol
  • a MIMO precoding module configured to perform MIMO precoding on the power modulated and transport layer mapped modulated symbols by using a multiple input multiple output MIMO precoding matrix corresponding to the pattern vector of the non-orthogonal multiple access;
  • a resource mapping module configured to perform time-frequency resource mapping on the MIMO pre-coded modulation symbols corresponding to each antenna port according to the indication of the non-orthogonal multiple access pattern vector;
  • an OFDM symbol generating module configured to generate and transmit an orthogonal frequency division multiplexing OFDM symbol of each antenna port according to the modulation symbol mapped by the time-frequency resource.
  • the power adjustment module is configured to:
  • the power adjustment is performed on the pattern vector modulation symbols of the non-orthogonal multiple access according to the indication of the base station or the autonomous determination of the allocated power.
  • different powers allocated for uplink data corresponding to different non-orthogonal multiple access access pattern vectors; or, corresponding to different non-orthogonal multiple access access patterns The same power is allocated for the uplink data of the vector.
  • all transport layers of all terminals use mutually orthogonal demodulation reference signals DMRS.
  • the layer mapping module is configured to:
  • n is a maximum row weight of a pattern matrix not less than a non-orthogonal multiple access pattern vector of the terminal; wherein, a non-orthogonal multiple address
  • the modulation symbols of the accessed pattern vector are mapped to one or more transport layers.
  • a terminal is provided in the embodiment of the present invention, including:
  • a processor for reading a program in the memory performing the following process:
  • transceiver for receiving and transmitting data under the control of a processor
  • a memory that holds the data used by the processor to perform operations.
  • the processor when performing power adjustment on the non-orthogonal multiple access access pattern vector modulation symbol, the processor reads the program from the memory, and performs the following process:
  • the power adjustment is performed on the pattern vector modulation symbols of the non-orthogonal multiple access according to the indication of the base station or the autonomous determination of the allocated power.
  • different powers allocated for uplink data corresponding to different non-orthogonal multiple access access pattern vectors; or, corresponding to different non-orthogonal multiple access access patterns The same power is allocated for the uplink data of the vector.
  • all transmission layers of all terminals use mutually orthogonal demodulation reference signals DMRS.
  • the processor is configured to read the program from the memory, and perform the following process:
  • n is a maximum row weight of a pattern matrix not less than a non-orthogonal multiple access pattern vector of the terminal; wherein, a non-orthogonal multiple address
  • the modulation symbols of the accessed pattern vector are mapped to one or more transport layers.
  • An embodiment of the present invention provides an apparatus for receiving uplink data, including:
  • a channel matrix reconstruction module configured to reconstruct a non-orthogonal multiple access extended spatial frequency equivalent channel matrix of a multi-terminal of a time-frequency resource, and a non-orthogonal multiple access extension of the multi-terminal of the time-frequency resource
  • the space-frequency equivalent channel matrix is occupied by non-orthogonal multiple access of each terminal that occupies uplink data on the time-frequency resource Accessing an extended space-frequency equivalent channel, wherein the non-orthogonal multiple access extended spatial-frequency equivalent channel of each time-frequency resource is corresponding to uplink data sent by the terminal in the time-frequency resource MIMO channel estimation of the plurality of frequency domain resources, wherein the plurality of frequency domain resources corresponding to the uplink data are indicated by a pattern vector of non-orthogonal multiple access corresponding to the uplink data;
  • an uplink data detecting module configured to detect, according to the non-orthogonal multiple access access extended space-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource, uplink data that is sent by the multiple terminals in the time-frequency resource.
  • the channel matrix reconstruction module is configured to:
  • the non-orthogonal multiple access extension extended space-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource is reconstructed according to the first spatial domain and the frequency domain.
  • a pattern vector distribution module is further configured to:
  • the pattern data of different non-orthogonal multiple access access is preferentially allocated to the uplink data of each terminal on the same time-frequency resource, and the uplink data of one terminal corresponds to one or more non-orthogonal multiple access accesses.
  • Pattern vector if the number of pattern vectors of non-orthogonal multiple access cannot satisfy the uplink data, assign a non-orthogonal multiple access pattern vector to the uplink data of each terminal according to at least one of the following criteria:
  • At least two terminals whose channel spatial correlation is lower than a set threshold allow transmission of uplink data using the same non-orthogonal multiple access pattern vector.
  • the uplink data detection module is configured to:
  • Detecting by using a linear detection or a non-linear detection method, the uplink data of the plurality of terminals in the time-frequency resource according to the non-orthogonal multiple access extension extended spatial-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource, and Perform interference cancellation or iterative detection decoding.
  • a base station is provided in the embodiment of the present invention, including:
  • the frequency equivalent channel is composed of MIMO channel estimation of a plurality of frequency domain resources corresponding to the uplink data sent by the terminal in the time-frequency resource, and the plurality of frequency domain resources corresponding to the uplink data are not corresponding to the uplink data.
  • transceiver for receiving and transmitting data under the control of a processor
  • a memory that holds the data used by the processor to perform operations.
  • the processor when reconstructing a non-orthogonal multiple access of the time-frequency resource and expanding the space-frequency equivalent channel matrix, the processor is configured to read the program from the memory, and perform the following process:
  • the non-orthogonal multiple access extension extended space-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource is reconstructed according to the first spatial domain and the frequency domain.
  • the processor is further configured to read the program from the memory and perform the following process:
  • the pattern data of different non-orthogonal multiple access access is preferentially allocated to the uplink data of each terminal on the same time-frequency resource, and the uplink data of one terminal corresponds to one or more non-orthogonal multiple access accesses.
  • Pattern vector if the number of pattern vectors of non-orthogonal multiple access cannot satisfy the uplink data, assign a non-orthogonal multiple access pattern vector to the uplink data of each terminal according to at least one of the following criteria:
  • At least two terminals whose channel spatial correlation is lower than a set threshold allow transmission of uplink data using the same non-orthogonal multiple access pattern vector.
  • the non-orthogonal multiple access extended spatial-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource is used to detect uplink data sent by the multiple terminals in the time-frequency resource.
  • the processor is used to read the program from memory, the following process is performed:
  • Detecting by using a linear detection or a non-linear detection method, the uplink data of the plurality of terminals in the time-frequency resource according to the non-orthogonal multiple access extension extended spatial-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource, and Perform interference cancellation or iterative detection decoding.
  • the non-orthogonal multiple access technology is combined with the uplink MIMO technology, and the non-orthogonal multiple access technology is utilized in the time-frequency domain, the coding domain, the power domain, and the airspace.
  • the feature can support more terminals to simultaneously transmit data on the same time-frequency resource, thereby achieving an increase in system capacity or the number of access terminals.
  • FIG. 1 is a schematic flowchart of a method according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a method according to another embodiment of the present invention.
  • FIG. 3 is a schematic block diagram of an implementation of PDMA and MIMO precoding according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a system according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a process of receiving and detecting a base station according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a system according to another embodiment of the present invention.
  • FIG. 8 is a schematic diagram of an apparatus according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a device according to another embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • the core of the technical solution provided by the embodiment of the present invention is to implement non-orthogonal multiple access technology and uplink
  • the combination of MIMO technology makes full use of the characteristics of non-orthogonal multiple access technology in time-frequency domain, coding domain, power domain and airspace, which can support more terminals to simultaneously transmit data on the same time-frequency resources, thereby realizing system capacity. Or an increase in the number of access user terminals.
  • a PDMA Packet Control Multiple Access
  • PDMA Packet Control Multiple Access
  • other non-orthogonal multiple access techniques are also applicable to embodiments of the present invention.
  • PDMA is a new type of non-orthogonal multiple access technology. It utilizes the asymmetry of multi-user channels to achieve time-frequency domain and power domain by designing a sparse coding matrix and code-modulation joint optimization scheme with multi-user unequal diversity. Multi-dimensional non-orthogonal signals such as airspace are superimposed and transmitted to obtain higher multi-user multiplexing and diversity gain.
  • the PDMA can be mapped on multiple signal domains such as a coding domain, a power domain, and an airspace of a time-frequency resource to form a non-orthogonal feature pattern that distinguishes multiple users.
  • the basic concept is that the multi-terminal uses the columns of the PDMA pattern matrix (ie, the PDMA pattern vector) to superimpose and transmit the respective data on the same time-frequency resource;
  • the basic concept is that multiple terminals occupy the same time-frequency resource but use different transmission powers to superimpose and transmit the respective data;
  • the basic concept is that the data information of the multi-terminal is superimposed and transmitted on the spatial multi-antenna.
  • FIG. 1 is a schematic diagram of a method for sending uplink data on a terminal side according to an embodiment of the present disclosure, which specifically includes the following operations:
  • Step 100 Perform PDMA code modulation on the uplink data that has been channel coded by using a PDMA pattern vector corresponding to the uplink data.
  • the uplink data modulated by the PDMA code is called a modulation symbol of a PDMA pattern vector, hereinafter referred to as a modulation symbol.
  • Step 110 Perform power adjustment on the modulation symbol.
  • Step 120 Perform transmission layer mapping on the power modulated modulation symbols.
  • Step 130 Perform MIMO precoding on the power modulated and transport layer mapped modulation symbols by using the MIMO precoding matrix corresponding to the PDMA pattern vector.
  • the PDMA pattern vector corresponds to a MIMO precoding vector, that is, the MIMO precoding vector is a special MIMO precoding matrix.
  • the MIMO precoding matrix is further degraded to a scalar one.
  • Step 140 Perform time-frequency resource mapping on the MIMO pre-coded modulation symbols corresponding to each antenna port according to the indication of the PDMA pattern vector.
  • Step 150 Generate an OFDM (Orthogonal Frequency Division Multiplex) symbol for each antenna port according to the modulation symbol mapped by the time-frequency resource and transmit the symbol.
  • OFDM Orthogonal Frequency Division Multiplex
  • the non-orthogonal multiple access technology is combined with the uplink MIMO technology, and the characteristics of the non-orthogonal multiple access technology in the time-frequency domain, the coding domain, the power domain, and the airspace are fully utilized, and the A plurality of terminals simultaneously transmit data on the same time-frequency resource, thereby achieving an increase in system capacity or the number of access terminals.
  • power may be allocated according to the instruction of the base station, power adjustment may be performed on the PDMA pattern vector modulation symbol, or the allocated power may be determined autonomously, and power adjustment of the PDMA pattern vector modulation symbol may be performed.
  • different powers may be allocated for uplink data corresponding to different non-orthogonal multiple access pattern vectors, and data integration of different powers is used to improve detection performance.
  • the same power can also be allocated for the uplink data corresponding to the pattern vectors of different non-orthogonal multiple accesses.
  • the PDMA pattern vector may be allocated by the base station to the terminal, or the PDMA pattern vector used by the terminal may be selected by the terminal.
  • the correspondence between the uplink data and the PDMA pattern vector satisfies at least one of the following:
  • the uplink data of the terminal whose channel spatial correlation is higher than the set threshold corresponds to different PDMA pattern vectors
  • the uplink data of the terminal whose channel spatial correlation is lower than the set threshold corresponds to the same PDMA pattern vector or a different PDMA pattern vector;
  • the uplink data of one terminal corresponds to one or more non-orthogonal multiple access access pattern vectors.
  • the base station should allocate different PDMA pattern vectors for each terminal's data on the same block of time-frequency resources, and the uplink data of one terminal corresponds to one or more non-orthogonal multiple access access pattern vectors. .
  • the PDMA pattern vector can be allocated to the data of each terminal according to the following criteria: two or more terminals whose channel spatial correlation is higher than the set threshold, preferably used Different PDMA pattern vectors transmit uplink data. Two or more terminals whose channel spatial correlation is lower than a set threshold may use the same PDMA pattern vector to transmit uplink data.
  • DMRS DeModulation Reference Signal
  • the DMRS resource may be indicated by the base station for the terminal, or may be randomly selected by the terminal.
  • step 120 the power adjusted PDMA pattern vector modulation symbol is mapped to n transport layers, where n is not less than the maximum row weight of the pattern matrix formed by the PDMA pattern vector of the terminal; wherein, one non-orthogonal The modulation symbols of the pattern vector of the address access are mapped to one or more transport layers.
  • the number of elements with a value of 1 in each row in the matrix is the row weight of the row.
  • the row weight of the row with the highest row weight is the maximum row weight of the matrix.
  • the uplink data is first channel coded
  • Performing PDMA code modulation on the channel-coded uplink data where a conventional modulation constellation mapping may be used, or a new coding modulation may be performed according to the used PDMA pattern vector;
  • Power adjustment is performed on the PDMA pattern vector modulation symbols obtained by the PDMA code modulation.
  • different uplink data transmitted on the same time-frequency resource are used with different powers;
  • Time-frequency resource mapping is performed on the MIMO pre-coded signal corresponding to each antenna port: according to the indication of the PDMA pattern vector, "1" indicates that the data is mapped to the corresponding time-frequency resource of the time-frequency resource group corresponding to the PDMA pattern vector, “0” means no mapping;
  • OFDM symbol generation Generate OFDM symbols for each antenna port.
  • the PDMA basic transmission unit (including the occupied time-frequency resource, the PDMA pattern vector, the uplink DMRS, and the like) used by the uplink data of the terminal may be instructed by the base station or determined by the terminal itself. Selecting a PDMA basic transmission unit on a time-frequency resource usually meets the following rules:
  • the uplink data of one terminal uses a basic transmission unit corresponding to one or more PDMA pattern vectors.
  • the uplink data of a plurality of transport layers belonging to one PDMA pattern vector uses basic transmission units corresponding to the same PDMA pattern vector.
  • a plurality of terminals whose channel spatial characteristics are close to each other use basic transmission units corresponding to different PDMA pattern vectors.
  • a plurality of terminals having a lower channel spatial correlation may use the basic transmission unit of the same PDMA pattern vector.
  • all transmission layers of all terminals use mutually orthogonal demodulation reference signals DMRS.
  • the base station indicates different uplink DMRSs, or the terminal randomly selects the uplink DMRS.
  • MIMO precoding vector or matrix used for uplink data corresponding to a PDMA pattern vector It can be determined by the following rules:
  • a PDMA pattern vector may correspond to one or more transport layers.
  • a terminal uses multiple PDMA pattern vectors, it means that there will be multiple PDMA coded modulated data blocks. Assuming that the maximum row weight of the pattern matrix formed by multiple PDMA pattern vectors is n, then at least n transport layers are required.
  • FIG. 4 is a diagram of a method for receiving uplink data on a base station side according to an embodiment of the present disclosure, which specifically includes the following operations:
  • Step 400 Reconstruct a multi-terminal PDMA extended space-frequency equivalent channel matrix of a time-frequency resource according to the channel estimation result, where the multi-terminal PDMA extended space-frequency equivalent channel matrix of the time-frequency resource is occupied by the time-frequency resource a PDMA extended space-frequency equivalent channel matrix of each terminal that transmits uplink data, where each terminal in the PDMA extended space-frequency equivalent channel matrix of the time-frequency resource is sent by the terminal in the time-frequency resource
  • the MIMO channel estimation of the plurality of frequency domain resources corresponding to the data is configured, and the plurality of frequency domain resources corresponding to the uplink data are indicated by a PDMA pattern vector corresponding to the uplink data.
  • Step 410 Detect, according to the PDMA extended space frequency equivalent channel matrix of the multi-terminal of the time-frequency resource, uplink data sent by the multiple terminals on the time-frequency resource.
  • the non-orthogonal uplink multiple access technology is combined with the uplink MIMO technology, and the PDMA time-frequency domain, the coding domain, the power domain, and the airspace are fully utilized to support more terminals in the same time-frequency resource. Data is transmitted simultaneously, thereby increasing the system capacity or the number of access terminals.
  • the base station receiver can use linear detection (such as Minimum Mean Square Error (MMSE)) or nonlinear detection (such as Belief Propagation). SIC (Successive Interference Cancellation) or Iterative Detection and Decoding (IDD).
  • linear detection such as Minimum Mean Square Error (MMSE)
  • nonlinear detection such as Belief Propagation
  • SIC Successessive Interference Cancellation
  • IDD Iterative Detection and Decoding
  • the step 400 may be: reconstructing, according to the channel estimation result on a time-frequency resource, a PDMA extended space-frequency equivalent channel matrix of a multi-terminal of a time-frequency resource according to a frequency domain re-space method;
  • the PDMA extended space-frequency equivalent channel matrix of a multi-terminal of a time-frequency resource may be reconstructed according to the channel estimation result on the time-frequency resource according to the first spatial domain and the frequency domain.
  • the method further includes, for the scheduling service, preferentially assigning different non-orthogonal multiple access access pattern vectors to the uplink data of each terminal on the same time-frequency resource, and the uplink data of one terminal corresponds to one or more Non-orthogonal multiple access pattern vector; if the number of pattern vectors of non-orthogonal multiple access cannot satisfy the uplink data, the non-orthogonal multiple access pattern vector may be allocated to the uplink data of each terminal according to at least one of the following criteria: :
  • At least two terminals whose channel spatial correlation is lower than a set threshold allow transmission of uplink data using the same non-orthogonal multiple access pattern vector.
  • the following example uses the PDMA pattern matrix [3, 7] for non-orthogonal multiplexing transmission as an example to perform the above description of the transmitting end and receiving end schemes. It is assumed that both the terminal and the base station have 2 antennas, that is, each terminal is a 2 ⁇ 2 uplink MIMO system.
  • lowercase bold letters indicate column vectors
  • uppercase bold letters indicate matrix
  • “1” is all 1 matrix or vector
  • ordinary letters are scalar
  • ⁇ is the product of the corresponding element of the matrix or vector
  • the superscript "(u)" represents the terminal u.
  • terminal 1 and the terminal 2 are similar in channel spatial characteristics, and can be classified into a spatial beam.
  • different PDMA pattern vectors should be allocated.
  • Terminal 1 and terminal 4 are far apart in channel space characteristics. Classified as non-adjacent spatial beams, you can assign different PDMA pattern vectors, or you can assign the same PDMA pattern vector, especially if the number of terminals is large and the PDMA pattern vector is not enough.
  • no scheduling different terminals may use the same PDMA pattern vector.
  • the PDMA basic transmission unit occupied by each terminal should use orthogonal uplink DMRS resources as much as possible.
  • the terminal 1 selects the pattern vector corresponding to the second column of the PDMA pattern matrix.
  • Terminal 3 selects the pattern vector corresponding to columns 5 and 6 of the PDMA pattern matrix. As shown in Figure 5. Since the terminal 2 is close in spatial characteristics to the terminal 1, it is necessary to select a pattern vector different from the terminal 1, and it is assumed that the terminal 2 is assigned a pattern vector corresponding to the seventh column of the PDMA pattern matrix. Because the terminal 4 is far from the terminal 1 in terms of channel space characteristics, the same pattern vector as the terminal 1 can be selected for the terminal 4. In this embodiment, the pattern vector corresponding to the second column of the PDMA pattern matrix is selected for the terminal 4.
  • the space frequency channel matrix can be expressed as
  • the PDMA space frequency channel matrix After using the PDMA pattern vector H PDMA (k), the PDMA space frequency channel matrix can be expressed as:
  • a plurality of frequency domain resources occupied by a basic transmission unit used by a terminal to transmit uplink data use the same MIMO precoding matrix or vector as W or w, where element w jl is a MIMO precoding right of transmission layer 1 to transmission antenna j value.
  • the coded modulation symbol s corresponding to the PDMA pattern vector H PDMA (k) is written by MIMO precoding and PDMA time-frequency resource mapping, and the space-frequency received signal vector obtained through the space-frequency channel is written:
  • terminal 1 selects the pattern vector [1 1 0] T corresponding to the second column of the PDMA pattern matrix, and the matrix formed by the pattern vector is still the column vector, and the maximum row weight (that is, the maximum value of the number of rows per row) Is 1, therefore at least 1 transport layer is required (>1 transport layer can still transmit this PDMA coded modulation symbol stream); terminal 3 selects the pattern vector corresponding to the 5th and 6th columns of the PDMA pattern matrix [1 0 0; 1 0] T , whose pattern vector consists of a matrix dimension of 3*2 and a maximum row weight of 1, so at least 1 transport layer is needed (>1 transport layer can still transmit this PDMA coded modulation symbol stream).
  • the MIMO precoding process of the uplink DMRS symbol on the basic transmission unit corresponding to each transmission layer of the transmission uplink data of the terminal is consistent with the MIMO precoding process of the data symbol.
  • the base station receives a DMRS of a PDMA basic transmission unit that transmits uplink data on a time-frequency resource, and performs channel estimation, and combines multiple frequency domain MIMO channel estimation results occupied by the PDMA pattern vector used by the terminal to form the
  • the user's PDMA extends the space-frequency equivalent channel matrix.
  • the PDMA extended space-frequency equivalent channel matrices of all terminals are then combined into a PDMA extended space-frequency equivalent channel matrix of all terminals.
  • the PDMA extended space-frequency equivalent channel matrix combination of a terminal on a time-frequency resource can be:
  • the frequency domain and the airspace may be first: the frequency domain channels occupied by all PDMA pattern vectors between the pairs of transmitting and receiving antennas are sequentially arranged.
  • the terminal uses the PDMA extended space-frequency equivalent channel in the pre-frequency domain back-space domain combination mode (the subsequent descriptions are in the combination of the pre-frequency domain and the airspace domain):
  • each element in the PDMA extended space-frequency equivalent channel matrix is an uplink DMRS channel estimation result.
  • These DMRS channel estimation results form a PDMA extended space-frequency equivalent channel in two combinations.
  • Terminal 1 The MIMO precoding vector of rank 1 is PDMA pattern vector is Then its PDMA space-frequency equivalent channel is:
  • the MIMO precoding vector of rank 2 is PDMA pattern vector is At this time, the data of one PDMA pattern vector is transmitted through two transport layers, and the amount of data transmitted is doubled. Then its PDMA space-frequency equivalent channel is:
  • the terminal 3 uses two PDMA pattern vectors, and the PDMA pattern vector is And the maximum row weight of the coding matrix formed by the selected two PDMA pattern vectors is 1, then the MIMO precoding vector of rank 1 of one transmission layer can be used. At this time, two PDMA pattern vectors are used and each PDMA pattern vector data is transmitted through one transport layer, and the amount of data transmitted by the terminal 3 is doubled.
  • the MIMO precoding vector of rank 1 the PDMA space-frequency equivalent channel corresponding to the first PDMA pattern vector is:
  • the PDMA space-frequency equivalent channel corresponding to the second PDMA pattern vector is:
  • the MIMO precoding matrix of rank 2 of the two transmission layers can also be used.
  • the PDMA space-frequency equivalent channel corresponding to the first PDMA pattern vector is:
  • the PDMA space-frequency equivalent channel corresponding to the second PDMA pattern vector is:
  • Terminal 4 The MIMO precoding vector of rank 1 is PDMA pattern vector is Then its PDMA space-frequency equivalent channel is
  • the receiving and detecting process of the receiving end of the base station is as shown in FIG. 6.
  • the base station first performs channel estimation according to the uplink DMRS of each terminal received by all receiving antennas, and then reconstructs the PDMA extended space frequency channel matrix of all terminals used for multi-user joint detection according to the PDMA pattern vector used by each terminal.
  • the PDMA extended space frequency channel matrix can be written as:
  • the PDMA extended space frequency channel matrix can be written as:
  • the PDMA extended space frequency channel matrix can be written as:
  • each of them Both are channel estimation results of the uplink DMRS transmitted from the PDMA basic transmission unit used by each user terminal.
  • the number of columns in the PDMA extended space frequency channel matrix corresponding to the MIMO precoding of rank n is n, and each PDMA pattern vector corresponds to at least one column.
  • the number of columns corresponding to the terminal 2 is 2, and the two PDMA pattern vectors of the terminal 3 correspond to one column.
  • the dimension of the PDMA extended space-frequency channel matrix is (N R K) ⁇ N S , where N R is the number of receiving antennas of the base station, K is the number of rows of the PDMA pattern vector, and N S is the number of transmission layers of all terminals transmitted for this time.
  • the base station receiver can adopt a nonlinear detector BP-IDD, wherein one channel coding block of the terminal 2 corresponds to one PDMA pattern vector, and two transmission layers are used. When performing IDD, the second and third columns of the BP output result need to be used. A whole performs channel decoding.
  • a linear detector (such as MMSE) and SIC can also be used when (N R K) ⁇ N S .
  • the traditional uplink MIMO full transmission transmission layer is the number of base station receiving antennas N R , and the system overload rate after combining PDMA and uplink MIMO can be defined as N S /(N R K).
  • the above-mentioned row 9 terminal uses the PDMA pattern matrix [3, 7] for non-orthogonal multiplexing transmission as an example, and all configurations, parameters, and PDMA space-frequency equivalent channel formulas of the terminal 1 to the terminal 4 are the same as in the previous embodiment.
  • the added terminal 5 to terminal 9 are as shown in FIG.
  • the terminals 5, 6, and 9 all use the MIMO precoding vector of rank 1, and the terminals 7, 8 use the MIMO precoding matrix of rank 2.
  • the terminal 8 and the terminal 6 use the same PDMA pattern vector, and the terminal 9 and the terminal 2 use the same PDMA pattern vector.
  • the terminal 5 to the terminal 8 are both two transmitting antennas, and the terminal 9 has one transmitting antenna.
  • the PDMA extended space frequency channel matrix when multiple frequency domain resources use the same MIMO precoding can be written as:
  • the overload rate of this embodiment is 13/(2 ⁇ 3) ⁇ 2.17, which indicates that the combination of PDMA and uplink MIMO can improve the system capacity or the number of access terminals.
  • the embodiment of the present invention provides an apparatus for transmitting uplink data, as shown in FIG.
  • the non-orthogonal multiple access code modulation module 801 is configured to divide the pattern vector of the non-orthogonal multiple access access by using the pattern corresponding to the uplink data, and input the channel-coded uplink data. Obtaining a non-orthogonal multiple access access pattern vector modulation symbol after performing non-orthogonal multiple access code modulation;
  • a power adjustment module 802 configured to perform power adjustment on the modulation symbol
  • a layer mapping module 803, configured to perform transmission layer mapping on the power modulated modulation symbol
  • a MIMO precoding module 804 configured to perform MIMO precoding on the power modulated and transport layer mapped modulated symbols by using a multiple input multiple output MIMO precoding matrix corresponding to the pattern vector of the non-orthogonal multiple access;
  • the resource mapping module 805 is configured to perform time-frequency resource mapping on the MIMO pre-coded modulation symbols corresponding to each antenna port according to the indication of the pattern vector of the non-orthogonal multiple access;
  • the OFDM symbol generating module 806 is configured to generate and transmit orthogonal frequency division multiplexing OFDM symbols of each antenna port according to the modulation symbols mapped by the time-frequency resources.
  • the power allocated for the uplink data corresponding to the pattern vectors of different non-orthogonal multiple accesses is different; or the power allocated for the uplink data corresponding to the pattern vectors of different non-orthogonal multiple accesses is the same.
  • different powers allocated for different uplink data optionally, different powers allocated for different uplink data; or the same power allocated for different uplink data.
  • the channel is based on any of the foregoing device embodiments.
  • the correspondence between the uplink data and the pattern vector of the non-orthogonal multiple access device satisfies at least one of the following:
  • the uplink data of the terminal whose channel spatial correlation is higher than the set threshold corresponds to a different non-orthogonal multiple access access pattern vector
  • the uplink data of the terminal whose spatial correlation is lower than the set threshold corresponds to the same PDMA pattern vector or a different non-orthogonal multiple access access pattern vector;
  • the uplink data of one terminal corresponds to one or more non-orthogonal multiple access access pattern vectors.
  • all transport layers of all terminals use mutually orthogonal demodulation reference signals DMRS.
  • the layer mapping module is configured to:
  • n is a maximum row weight of a pattern matrix not less than a non-orthogonal multiple access pattern vector of the terminal; wherein, a non-orthogonal multiple address
  • the modulation symbols of the accessed pattern vector are mapped to one or more transport layers.
  • the power adjustment module is configured to:
  • the embodiment of the present invention further provides a terminal, as shown in FIG. 9, including:
  • the processor 900 is configured to read a program in the memory 920 and perform the following process:
  • the transceiver 910 is configured to receive and send data under the control of the processor 900;
  • the memory 920 is configured to save data used by the processor 900 to perform operations.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 900 and various circuits of memory represented by memory 920.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • Transceiver 910 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the user interface 930 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the processor 900 is responsible for managing the bus architecture and general processing, and the memory 920 can store data used by the processor 900 in performing operations.
  • the processor when performing power adjustment on the non-orthogonal multiple access access pattern vector modulation symbol, the processor reads the program from the memory, and performs the following process:
  • the power of the modulation symbol of the pattern vector of the non-orthogonal multiple access is adjusted according to the indication of the base station or the autonomous determination of the allocated power.
  • the power allocated to the uplink data corresponding to different non-orthogonal multiple access access patterns is different; or, corresponding to different non-orthogonal multiple access access patterns
  • the uplink data of the vector is allocated the same power.
  • the correspondence between the uplink data and the pattern vector of the non-orthogonal multiple access access meets at least one of the following:
  • the uplink data of the terminal whose channel spatial correlation is higher than the set threshold corresponds to a different non-orthogonal multiple access access pattern vector
  • the uplink data of the terminal whose channel spatial correlation is lower than the set threshold corresponds to the same non-orthogonal multiple access access pattern vector or different non-orthogonal multiple access access pattern vector;
  • the uplink data of one terminal corresponds to one or more non-orthogonal multiple access access pattern vectors.
  • all transport layers of all terminals use mutually orthogonal demodulation reference signals DMRS.
  • the processor is configured to read the program from the memory, and perform the following process:
  • n is a maximum row weight of a pattern matrix not less than a non-orthogonal multiple access pattern vector of the terminal; wherein, a non-orthogonal multiple address
  • the modulation symbols of the accessed pattern vector are mapped to one or more transport layers.
  • the embodiment of the present invention further provides an uplink data transmission apparatus, as shown in FIG. 10, including:
  • the channel matrix reconstruction module 1001 is configured to reconstruct a multi-terminal non-orthogonal multiple access extended spatial frequency equivalent channel matrix of a time-frequency resource, and the multi-terminal non-orthogonal multiple access of the time-frequency resource
  • the extended space-frequency equivalent channel matrix is non-orthogonal for each terminal that occupies uplink data on the time-frequency resource a multiple access extension extended space-frequency equivalent channel, wherein each non-orthogonal multiple access access extended space-frequency equivalent channel of the time-frequency resource is sent by the terminal in the time-frequency resource
  • the MIMO channel estimation of the plurality of frequency domain resources corresponding to the data is configured, and the plurality of frequency domain resources corresponding to the uplink data are indicated by a pattern vector of the non-orthogonal multiple access corresponding to the uplink data;
  • the uplink data detecting module 1002 is configured to detect, according to the non-orthogonal multiple access extension extended space-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource, the uplink data of the transmission of the time-frequency resources by the plurality of terminals.
  • the channel matrix reconstruction module is configured to:
  • the extended space-frequency equivalent channel matrix of the non-orthogonal multiple access of the multi-terminal of the time-frequency resource is reconstructed according to the first spatial domain and the frequency domain.
  • a pattern vector distribution module is further configured to:
  • the pattern data of different non-orthogonal multiple access access is preferentially allocated to the uplink data of each terminal on the same time-frequency resource, and the uplink data of one terminal corresponds to one or more non-orthogonal multiple access accesses.
  • Pattern vector if the number of pattern vectors of non-orthogonal multiple access cannot satisfy the uplink data, assign a non-orthogonal multiple access pattern vector to the uplink data of each terminal according to at least one of the following criteria:
  • At least two terminals whose channel spatial correlation is lower than a set threshold allow transmission of uplink data using the same non-orthogonal multiple access pattern vector.
  • the uplink data detection module is configured to:
  • Detecting by using a linear detection or a non-linear detection method, the uplink data of the plurality of terminals in the time-frequency resource according to the non-orthogonal multiple access extension extended spatial-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource, and Perform interference cancellation or iterative detection decoding.
  • the embodiment of the present invention further provides a base station, as shown in FIG.
  • the processor 1100 is configured to read a program from the memory 1120 and perform the following process:
  • the frequency equivalent channel is composed of MIMO channel estimation of a plurality of frequency domain resources corresponding to the uplink data sent by the terminal in the time-frequency resource, and the plurality of frequency domain resources corresponding to the uplink data are not corresponding to the uplink data.
  • the transceiver 1110 is configured to receive and send data under the control of the processor 1100.
  • the memory 1120 is configured to save data used by the processor 1100 to perform an operation.
  • the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1100 and various circuits of memory represented by memory 1120.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • the transceiver 1110 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1120 can store data used by the processor 1100 in performing operations.
  • the processor when reconstructing a non-orthogonal multiple access of the time-frequency resource and expanding the space-frequency equivalent channel matrix, the processor is configured to read the program from the memory, and perform the following process:
  • the non-orthogonal multiple access extension extended space-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource is reconstructed according to the first spatial domain and the frequency domain.
  • the processor is further configured to read the program from the memory and perform the following process:
  • a pattern vector distribution module for:
  • the pattern data of different non-orthogonal multiple access access is preferentially allocated to the uplink data of each terminal on the same time-frequency resource, and the uplink data of one terminal corresponds to one or more non-orthogonal multiple access accesses.
  • Pattern vector if the number of pattern vectors of non-orthogonal multiple access cannot satisfy the uplink data, assign a non-orthogonal multiple access pattern vector to the uplink data of each terminal according to at least one of the following criteria:
  • At least two terminals whose channel spatial correlation is lower than a set threshold allow transmission of uplink data using the same non-orthogonal multiple access pattern vector.
  • the non-orthogonal multiple access extended spatial-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource is used to detect uplink data sent by the multiple terminals in the time-frequency resource.
  • the processor is used to read the program from memory, the following process is performed:
  • Detecting by using a linear detection or a non-linear detection method, the uplink data of the plurality of terminals in the time-frequency resource according to the non-orthogonal multiple access extension extended spatial-frequency equivalent channel matrix of the multi-terminal of the time-frequency resource, and Perform interference cancellation or iterative detection decoding.
  • the non-orthogonal multiple access technology is combined with the uplink MIMO technology, and the characteristics of the non-orthogonal multiple access technology in the time-frequency domain, the coding domain, the power domain, and the airspace are fully utilized, and the A plurality of terminals simultaneously transmit data on the same time-frequency resource, thereby achieving an increase in system capacity or the number of access terminals.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

L'invention concerne un procédé de transmission de données de liaison montante, un procédé de réception, et un dispositif. Le procédé de transmission comprend les étapes consistant à : utiliser un vecteur de motif d'accès multiple non orthogonal correspondant à des données de liaison montante, exécuter une modulation de codage d'accès multiple non orthogonal sur des données de liaison montante codées sur canal, et obtenir un symbole de modulation de vecteur de motif d'accès multiple non orthogonal ; puis, via un ajustement de la puissance, un mappage de la couche transmission, un précodage MIMO et un mappage de ressources, générer un symbole OFDM pour chaque port d'antenne. Un mode de réalisation de la présente invention associe une technique d'accès multiple non orthogonal à une technique MIMO en liaison montante. Cela permet d'utiliser au maximum les caractéristiques spéciales de la technique d'accès multiple non orthogonal dans le domaine temps-fréquence, le domaine des codes, le domaine de puissance et le domaine spatial, de prendre en charge plusieurs terminaux pour transmettre simultanément des données sur la même ressource temps-fréquence, et d'augmenter ainsi la capacité du système ou le nombre de terminaux d'accès.
PCT/CN2016/089197 2015-08-04 2016-07-07 Procédé de transmission de données de liaison montante, procédé de réception, et dispositif WO2017020680A1 (fr)

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