CN106411796B - Multiple terminals signal detecting method and base station in a kind of access of non-orthogonal multiple - Google Patents
Multiple terminals signal detecting method and base station in a kind of access of non-orthogonal multiple Download PDFInfo
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Abstract
The invention discloses multiple terminals signal detecting method and base stations in a kind of access of non-orthogonal multiple, to reduce the complexity for detecting multiple terminals data-signal in non-orthogonal multiple access under multiple antennas reception condition.This method are as follows: base station determines the receiving antenna number for meeting current detection performance and making detection complexity minimum；Receiving antenna is selected from candidate receiving antenna set according to determining receiving antenna number；Channel estimation is carried out to every receiving antenna of selection respectively, obtain the respective channel estimate matrix of every receiving antenna of selection, according to the respective reception signal of every receiving antenna of the respective channel estimate matrix of every of selection receiving antenna and selection, determine the corresponding data-signal of multiple terminals for carrying out running time-frequency resource multiplexing, wherein, the row of the channel estimate matrix indicates that the running time-frequency resource of multiplexing, the column of the channel estimate matrix indicate the multiple terminals being multiplexed on the corresponding multiple running time-frequency resources of a line of the channel estimate matrix.
Description
Technical Field
The invention relates to the technical field of non-orthogonal multiple access, in particular to a multi-terminal signal detection method and a base station in non-orthogonal multiple access.
Background
With the rapid development of wireless communication, the number of users and the amount of traffic are increasing explosively, which continuously puts higher demands on the system capacity of wireless networks. Industry research predicts that mobile data traffic will double at a rate every year, and by 2020, approximately 500 billion terminals will have access to wireless mobile networks globally. The explosive growth of users makes multiple access technology a central problem for network upgrades. Multiple access techniques determine the basic capacity of the network and have a significant impact on system complexity and deployment costs.
Conventional mobile communications (1G-4G) employ orthogonal multiple access techniques such as frequency division multiple access, time division multiple access, code division multiple access, orthogonal frequency division multiplexing multiple access. From the perspective of the multi-user information theory, the traditional orthogonal mode can only reach the inner boundary of the multi-user capacity boundary, and the utilization rate of wireless resources is low.
A Pattern Division Multiple Access (PDMA), abbreviated as cdma, is a non-orthogonal Multiple Access technique, which is a technique based on the overall optimization of a multi-user communication system and joint processing by a transmitting end and a receiving end. At a transmitting end, distinguishing users based on non-orthogonal characteristic patterns of a plurality of signal domains; at a receiving end, based on a characteristic structure of a user pattern, a Serial Interference Cancellation (SIC) mode is adopted to realize multi-user detection, so that further multiplexing of multi-users on existing time-frequency wireless resources is achieved, and the problem that in the prior art, an orthogonal mode can only reach the inner boundary of a multi-user capacity boundary and the utilization rate of wireless resources is low is solved.
In the PDMA, a sending terminal sends signals of one or more terminals; and performing non-orthogonal characteristic pattern mapping on the signals of the one or more transmitted terminals to superpose the signals of different terminals on corresponding wireless resources, and transmitting the signals of the one or more transmitted terminals according to the non-orthogonal characteristic pattern mapping result. Due to the fact that signals of one or more terminals can be subjected to non-orthogonal superposition on wireless resources, non-orthogonal multiple access transmission is achieved, and utilization rate of the wireless resources is improved.
In the PDMA, a receiving end carries out non-orthogonal characteristic pattern detection on received signals corresponding to a plurality of terminals, and determines non-orthogonal characteristic patterns corresponding to the received signals; and carrying out multi-terminal detection in an SIC mode on the received signals by using the detected non-orthogonal characteristic patterns, and carrying out receiving processing to determine data of different terminals.
Wherein the receiving end usually adopts Belief Propagation (BP) algorithm for detection.
Taking uplink transmission of one transmitting antenna and two receiving antennas as an example, as shown in fig. 1, the signal model is defined as the following equations 1, 2 and 3:
xT＝[x1 x2 x3] (1)
wherein x is1A transmission signal, x, representing user 12A transmission signal x representing the user 23A transmission signal representing the user 3 is transmitted,representing the received signal on two time-frequency Resource Elements (REs) of the antenna 1,representing the received signal on two time-frequency Resource Elements (REs) of the antenna 2.
The variable nodes of the BP algorithm are u nodes in the figure 1, and the observation nodes are c nodes in the figure 1. The number of variable nodes is equal to the number of users multiplexed on the same time-frequency resource.
The BP algorithm is a high-performance high-complexity nonlinear multi-user detection algorithm approaching Maximum Likelihood (ML), and the detection complexity generally increases exponentially with the number of variable nodes (i.e., users multiplexing the same time-frequency resource).
Therefore, when the number of users multiplexing the same time-frequency resource is large, the complexity of detecting by the receiving end through the BP algorithm under the condition of multi-antenna receiving is high in the PDMA system.
Disclosure of Invention
The embodiment of the invention provides a multi-terminal signal detection method and a base station in non-orthogonal multiple access, which are used for reducing the complexity of detecting multi-terminal data signals under the condition of non-orthogonal multiple access multi-antenna receiving.
The embodiment of the invention provides the following specific technical scheme:
in a first aspect, a method for detecting signals of non-orthogonal multiple access multiple terminals is provided, including:
the base station determines the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest;
the base station selects a receiving antenna from the candidate receiving antenna set according to the determined number of the receiving antennas;
the base station carries out channel estimation on each selected receiving antenna respectively to obtain a respective channel estimation matrix of each selected receiving antenna, and determines data signals corresponding to a plurality of terminals carrying out time-frequency resource multiplexing according to the respective channel estimation matrix of each selected receiving antenna and the respective receiving signal of each selected receiving antenna, wherein the row of the channel estimation matrix represents multiplexed time-frequency resources, and the column of the channel estimation matrix represents a plurality of terminals multiplexed on a plurality of time-frequency resources corresponding to one row of the channel estimation matrix.
In an implementation, the base station determines the number of receiving antennas that satisfy the current detection performance and minimize the detection complexity, including:
the base station determines the number of corresponding receiving antennas when the current detection performance is met and the detection complexity is the lowest according to the corresponding relation between the preset detection performance and the detection complexity corresponding to the current input condition and the number of the receiving antennas;
or,
and the base station determines the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest according to the configuration parameters of the operation maintenance system.
In an implementation, the selecting, by the base station, a receiving antenna from the candidate receiving antenna set according to the determined number of receiving antennas includes:
and the base station selects a plurality of receiving antennas of the determined receiving antennas from the candidate receiving antenna set according to the performance of each receiving antenna in the candidate receiving antenna set for respectively receiving the signal of each terminal.
In an implementation, the selecting, by the base station, the determined receiving antennas from the candidate receiving antenna set according to the performance of each receiving antenna in the candidate receiving antenna set for respectively receiving the signal of each terminal includes:
the base station selects a first set number of receiving antennas corresponding to each terminal from the candidate receiving antenna set respectively to obtain a first receiving antenna set, wherein the performance of the selected first set number of receiving antennas for receiving the signals of the terminal is superior to the performance of other receiving antennas in the candidate receiving antenna set for receiving the signals of the terminal;
the base station determines the selected times of each receiving antenna in the first receiving antenna set, and selects the determined receiving antennas with the number not less than the determined receiving antennas from the first receiving antenna set according to the selected times.
In implementation, the determining, by the base station, data signals corresponding to multiple terminals performing time-frequency resource multiplexing according to the selected respective channel estimation matrix of each receiving antenna and the selected respective receiving signal of each receiving antenna includes:
the base station determines a joint channel estimation matrix according to the selected respective channel estimation matrix of each receiving antenna;
the base station determines a joint received signal vector according to the respective received signal of each selected receiving antenna;
and the base station takes the joint channel estimation matrix and the joint receiving signal vector as input parameters of a detection algorithm, and the detection algorithm is adopted to detect and obtain data signals corresponding to a plurality of terminals for time-frequency resource multiplexing.
In implementation, the detection algorithm is a quasi-Maximum Likelihood (ML) algorithm or a Maximum Likelihood (ML) algorithm.
In implementation, the determining, by the base station, a joint channel estimation matrix according to the selected respective channel estimation matrix of each receive antenna includes:
and the base station multiplies the selected respective channel estimation matrix of each receiving antenna by the element point of the corresponding position of the PDMA pattern matrix to obtain the joint channel estimation matrix.
In an implementation, the input conditions include any one or a combination of more than one of:
the method comprises the steps of detecting algorithm, modulation and coding mode of a terminal, wireless channel condition, overload rate of PDMA pattern matrix and interference level of adjacent cells.
In implementation, if the current input conditions corresponding to each terminal are different, the base station determines, according to the corresponding relationship between the current input conditions and the preset detection performance, detection complexity and number of receiving antennas, the number of receiving antennas corresponding to the minimum detection complexity and meeting the current detection performance, including:
the base station determines the number of first receiving antennas corresponding to the terminal when the current detection performance is met and the detection complexity is lowest according to the preset corresponding relation between the detection performance and the detection complexity and the number of the receiving antennas corresponding to the current input condition corresponding to the terminal;
and the base station selects the maximum value in the number of the first antennas corresponding to each terminal, and determines the maximum value as the number of the corresponding receiving antennas meeting the current detection performance of each terminal and having the lowest detection complexity.
In a second aspect, a base station is provided, including:
the antenna number determining module is used for determining the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest;
a selection module for selecting a receiving antenna from the candidate receiving antenna set according to the determined number of receiving antennas;
a signal determining module, configured to perform channel estimation on each selected receiving antenna, obtain a channel estimation matrix of each selected receiving antenna, and determine, according to the channel estimation matrix of each selected receiving antenna and a received signal of each selected receiving antenna, data signals corresponding to multiple terminals performing time-frequency resource multiplexing, where a row of the channel estimation matrix represents multiplexed time-frequency resources, and a column of the channel estimation matrix represents multiple terminals multiplexed on multiple time-frequency resources corresponding to a row of the channel estimation matrix.
In an implementation, the antenna number determining module is configured to:
determining the number of corresponding receiving antennas when the current detection performance is met and the detection complexity is the lowest according to the corresponding relation between the preset detection performance and the detection complexity corresponding to the current input condition and the number of the receiving antennas;
or,
and determining the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest according to the configuration parameters of the operation maintenance system.
In an implementation, the selection module is configured to:
and selecting a plurality of receiving antennas of the determined receiving antennas from the candidate receiving antenna set according to the performance of each receiving antenna in the candidate receiving antenna set for respectively receiving the signal of each terminal.
In one implementation, the selection module is configured to:
respectively selecting a first set number of receiving antennas corresponding to each terminal from the candidate receiving antenna set to obtain a first receiving antenna set, wherein the performance of the selected first set number of receiving antennas for receiving the signals of the terminal is superior to the performance of other receiving antennas in the candidate receiving antenna set for receiving the signals of the terminal;
determining the number of times of selection of each receiving antenna in the first receiving antenna set, and selecting the determined number of receiving antennas from the first receiving antenna set according to the number of times of selection, wherein the first set number is not less than the determined number of receiving antennas.
In an implementation, the signal determination module is to:
determining a joint channel estimation matrix according to the selected respective channel estimation matrix of each receiving antenna;
determining a joint received signal vector according to the respective received signal of each selected receiving antenna;
and taking the joint channel estimation matrix and the joint receiving signal vector as input parameters of a detection algorithm, and detecting by adopting the detection algorithm to obtain data signals corresponding to a plurality of terminals for time-frequency resource multiplexing.
Wherein, the detection algorithm is a quasi-maximum likelihood ML algorithm or a maximum likelihood ML algorithm.
Specifically, the signal determination module is configured to:
and respectively multiplying the selected respective channel estimation matrix of each receiving antenna by the element point of the corresponding position of the PDMA pattern matrix to obtain the joint channel estimation matrix.
Wherein the input condition comprises any one or combination of more of the following:
the method comprises the steps of detecting algorithm, modulation and coding mode of a terminal, wireless channel condition, overload rate of PDMA pattern matrix and interference level of adjacent cells.
In an implementation, the antenna number determining module is configured to:
if the current input conditions corresponding to each terminal are different,
for each terminal, determining the number of first receiving antennas corresponding to the terminal when the current detection performance is met and the detection complexity is the lowest according to the corresponding relation between the preset detection performance and the detection complexity and the number of the receiving antennas corresponding to the current input condition corresponding to the terminal;
and selecting the maximum value in the number of the first antennas corresponding to each terminal, and determining the maximum value as the number of the corresponding receiving antennas meeting the current detection performance of each terminal and having the lowest detection complexity.
Based on the technical scheme, in the embodiment of the invention, the base station determines the number of the corresponding receiving antennas which meet the current detection performance and have the lowest detection complexity, selects the receiving antennas from the candidate receiving antenna set according to the determined number of the receiving antennas, and performs detection based on the channel estimation and the receiving signals of the selected receiving antennas to obtain the data signals corresponding to the multiple terminals for time-frequency resource multiplexing, so that the complexity of detecting the user data signals under the condition of receiving the multiple antennas by non-orthogonal multiple access can be reduced under the condition of ensuring the detection performance.
Drawings
Fig. 1 is a schematic diagram of a signal model in which 3 users multiplex 2 time-frequency resources;
FIG. 2 is a flowchart illustrating a method for multi-user detection performed by a base station according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a base station structure according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another base station in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following embodiments, a procedure of multi-user detection in non-orthogonal multiple access is described by taking PDMA as an example, and it should be noted that the multi-user detection procedure provided in the following embodiments may also be applied to other non-orthogonal multiple access technologies, and is not limited to PDMA.
In the embodiment of the present invention, as shown in fig. 2, a detailed flow of a method for a base station to perform multi-terminal detection in non-orthogonal multiple access includes:
step 201: and the base station determines the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest.
The detection performance includes a block error rate (BLER), throughput, and the like.
The detection complexity is specifically a multiplication operand, an addition operand, and a comparison operand.
In implementation, the current detection performance is preset, and may be specifically set according to the current service type.
In implementation, the embodiments in which the base station determines the number of receiving antennas that satisfy the current detection performance and minimize the detection complexity include, but are not limited to, the following two types:
firstly, the base station determines the number of corresponding receiving antennas meeting the current detection performance and having the lowest detection complexity according to the corresponding relation between the preset detection performance and the preset detection complexity corresponding to the current input condition and the number of the receiving antennas.
Wherein the input conditions include, but are not limited to, any one or combination of more of the following: the method comprises the steps of detecting algorithm, modulation and coding mode of a terminal, wireless channel condition, overload rate of PDMA pattern matrix and interference level of adjacent cells. Each element in the PDMA pattern matrix takes a value of 0 or 1, if the value is 1, there is data mapping, and if the value is 0, there is no data mapping, each row of the PDMA pattern matrix represents a different resource unit (RE), each column represents one data layer, each end user can occupy 1 or more data layers, and each data layer can only be occupied by one end user.
In specific implementation, under the condition that multiple terminals multiplex time-frequency resources, the input conditions of each terminal corresponding to the multiplexed time-frequency resources may be the same or different.
And if the input conditions of each terminal corresponding to the multiplexing time-frequency resource are the same, determining the number of corresponding receiving antennas meeting the current detection performance and having the lowest detection complexity according to the preset corresponding relation between the detection performance and the detection complexity corresponding to the input conditions and the number of the receiving antennas.
If the input conditions of each terminal corresponding to the multiplexing time-frequency resources are different, determining the number of the corresponding receiving antennas which meet the current detection performance and have the lowest detection complexity as the number of the first antennas according to the corresponding relation between the preset detection performance and the detection complexity corresponding to the current input conditions corresponding to the terminal and the number of the receiving antennas, selecting the maximum value in the number of the first antennas corresponding to each terminal, determining the maximum value as the number of the corresponding receiving antennas which meet the current detection performance and have the lowest detection complexity of each terminal, namely the number of the antennas which are used for finally detecting the data signals of the time-frequency multiplexing terminals, and enabling the detection complexity to be the lowest under the condition that the detection performance is ensured.
Secondly, the base station determines the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest according to the configuration parameters of the operation maintenance system.
Specifically, the operation maintenance system determines the number of receiving antennas that satisfy the detection performance of the base station and that minimize the detection complexity according to the correspondence between the detection performance and the detection complexity of the base station, and configures the determined number of receiving antennas to the base station.
Step 202: and the base station selects the receiving antenna from the candidate receiving antenna set according to the determined number of the receiving antennas.
In implementation, the base station selects a plurality of receiving antennas of the determined receiving antennas from the candidate receiving antenna set according to the performance of each receiving antenna in the candidate receiving antenna set for respectively receiving the signal of each terminal.
For example, the determined receiving antennas may be randomly selected from the candidate receiving antenna set, or the determined receiving antennas may be randomly selected from the candidate receiving antenna set according to a preset rule.
In a specific embodiment, the base station selects, from the candidate receiving antenna sets, a first set number of receiving antennas corresponding to each of the terminals, respectively, to obtain a first receiving antenna set, where performance of the selected first set number of receiving antennas for receiving the signal of the terminal is better than performance of other receiving antennas in the candidate receiving antenna set for receiving the signal of the terminal; and the base station determines the selected times of each receiving antenna in the first receiving antenna set, and selects the determined receiving antennas with the number not less than the determined receiving antennas from the first receiving antenna set according to the selected times.
The performance of the receiving antenna for receiving the signal of the terminal may be the performance of the receiving antenna for receiving the signal of the terminal this time, or the performance of the receiving antenna for receiving the signal of the terminal within a set time length.
The performance of the receiving antenna for receiving the signal of the terminal may be specifically determined by the received power or the uplink signal-to-noise ratio, or by a combination of the received power and the uplink signal-to-noise ratio. The higher the received power, the better the performance of the receiving antenna for receiving the signal of the terminal, and the higher the uplink signal-to-noise ratio, the better the performance of the receiving antenna for receiving the signal of the terminal.
Step 203: and the base station respectively carries out channel estimation on each selected receiving antenna to obtain a respective channel estimation matrix of each selected receiving antenna, and determines data signals corresponding to a plurality of terminals for time-frequency resource multiplexing according to the respective channel estimation matrix of each selected receiving antenna and the respective receiving signal of each selected receiving antenna.
Wherein rows of the channel estimation matrix represent multiplexed time-frequency resources, and columns of the channel estimation matrix represent a plurality of terminals multiplexed on a plurality of time-frequency resources corresponding to a row of the channel estimation matrix.
In the implementation, the base station determines a joint channel estimation matrix according to the respective channel estimation matrix of each selected receiving antenna; the base station determines a joint received signal vector according to the respective received signal of each selected receiving antenna; and the base station takes the joint channel estimation matrix and the joint receiving signal vector as input parameters of a detection algorithm, and the detection algorithm is adopted to detect and obtain data signals corresponding to a plurality of terminals for time-frequency resource multiplexing.
Optionally, the detection algorithm is a quasi-ML algorithm or an ML algorithm, where the quasi-ML algorithm refers to a reduced complexity ML algorithm.
Specifically, the base station multiplies the respective channel estimation matrix of each selected receiving antenna by the element point at the corresponding position of the PDMA pattern matrix to obtain the joint channel estimation matrix.
The following describes a procedure of multi-user detection provided by an embodiment of the present invention with a specific embodiment.
In this specific embodiment, it is assumed that a terminal uses a single antenna for transmission, an uplink codeword is mapped to one layer, a large-scale antenna of a base station has 128 receiving antennas, a modulation and coding scheme of a target terminal user is Quaternary Phase Shift Keying (QPSK)1/3, BLER performance of the target terminal user is 1%, a detection algorithm used by the base station is a BP algorithm, a radio channel condition is a macro cell typical urban area non-direct path UMA NLOS, a PDMA pattern matrix with an overload rate of 233%, that is, PDMA [3,7], indicates that 7 terminal users are multiplexed on 3 same frequency resource units, and PDMA [3,7] is expressed by formula (4):
in the matrix, "1" indicates that there is a data map, and "1" in the same column indicates that the same data is mapped, and "0" indicates that there is no data map. Each row represents a different Resource Element (RE), each column represents 1 data layer, each end user may occupy 1 or more data layers, and each data layer may only be used by 1 end user.
Step one, the base station prestores and stores a table of corresponding relations of detection performance, detection complexity and the number of receiving antennas corresponding to different input conditions.
Specifically, the corresponding relationship between the detection performance and the detection complexity corresponding to different input Conditions (CASE) and the number of receiving antennas is obtained in a simulation manner, wherein the input conditions include a detection algorithm, a modulation and coding scheme of a terminal user, a wireless channel condition, an overload rate of a PDMA pattern matrix, an interference level of an adjacent cell, and the like.
Specifically, the different input conditions are distinguished by input condition numbers, as shown in table 1:
TABLE 1
Wherein, the correspondence between the detection performance and the detection complexity corresponding to the CASE1 and the number of the receiving antennas is shown in table 2:
TABLE 2
Wherein, the correspondence between the detection performance and the detection complexity corresponding to the CASE2 and the number of the receiving antennas is shown in table 3:
TABLE 3
And step two, when the base station receives in the uplink, determining that the current input condition is CASE2, searching the corresponding relation between the detection performance and the detection complexity corresponding to CASE2 and the number of the receiving antennas, namely table 3, and obtaining the number of the corresponding receiving antennas which meet the current detection performance, namely the target BLER is 1%, and the number of the receiving antennas is assumed to be 2 when the detection complexity is the lowest.
And step three, the base station selects 2 receiving antennas from the candidate receiving antenna set, namely 128 receiving antennas according to a set rule.
Specifically, for each of 7 terminal users multiplexing the same time-frequency resource, the base station selects N1-4 receiving antennas with the best performance for receiving the signal of the terminal user from 128 receiving antennas, and records the number of the selected N1 receiving antennas; after traversing each terminal, determining the selected times of each selected receiving antenna, sorting the numbers of the selected receiving antennas according to the sequence of the selected times from top to bottom, selecting the N-2 receiving antennas with the highest selected times according to the determined sequence, and recording the numbers of the N-2 receiving antennas with the highest selected times.
Step four, the base station constructs a joint channel estimation matrixAnd combining the received signal vectors
Specifically, the base station respectively carries out channel estimation according to the receiving antennas selected in the step three, constructs a joint channel estimation matrix, and constructs a joint receiving signal vector according to the receiving signals on the receiving antennas selected in the step threeExpressed by equation (5) and equation (6) are as follows:
whereinAre respectively shown at1 receiving signals on three time-frequency resources of the receiving antennas;respectively representing the received signals on three time-frequency resources of the 2 nd receiving antenna, wherein the subscript represents a user index number, and the superscript represents a receiving antenna index number; "□" represents a dot product of the corresponding position elements of the matrix.
Wherein,denotes the n-thrThe original channel estimation matrix on the root receive antenna, expressed as equation (7):
wherein,denotes the n-thrAnd receiving the channel response of the mth terminal user on the nth time-frequency resource on the antenna.
Step five, the base station estimates the matrix by the joint channelAnd combining the received signal vectorsAnd inputting the data signals into a BP detector for detection to obtain data signals corresponding to 7 terminal users for time-frequency resource multiplexing.
Based on the same inventive concept, embodiments of the present invention provide a base station, and specific implementation of the base station may refer to the description of the foregoing method embodiment, and repeated details are not repeated, as shown in fig. 3, the base station mainly includes:
an antenna number determining module 301, configured to determine the number of receiving antennas that meet current detection performance and minimize detection complexity;
a selecting module 302, configured to select a receiving antenna from the candidate receiving antenna set according to the determined number of receiving antennas;
a signal determining module 303, configured to perform channel estimation on each selected receiving antenna, respectively, to obtain a channel estimation matrix of each selected receiving antenna, and determine, according to the channel estimation matrix of each selected receiving antenna and a received signal of each selected receiving antenna, data signals corresponding to multiple terminals performing time-frequency resource multiplexing, where a row of the channel estimation matrix represents a multiplexed time-frequency resource, and a column of the channel estimation matrix represents multiple terminals multiplexed on multiple time-frequency resources corresponding to a row of the channel estimation matrix.
In implementation, the antenna number determining module 301 is configured to:
determining the number of corresponding receiving antennas when the current detection performance is met and the detection complexity is the lowest according to the corresponding relation between the preset detection performance and the detection complexity corresponding to the current input condition and the number of the receiving antennas;
or,
and determining the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest according to the configuration parameters of the operation maintenance system.
In an implementation, the selection module 302 is configured to:
and selecting a plurality of receiving antennas of the determined receiving antennas from the candidate receiving antenna set according to the performance of each receiving antenna in the candidate receiving antenna set for respectively receiving the signal of each terminal.
In one implementation, the selection module 302 is configured to:
respectively selecting a first set number of receiving antennas corresponding to each terminal from the candidate receiving antenna set to obtain a first receiving antenna set, wherein the performance of the selected first set number of receiving antennas for receiving the signals of the terminal is superior to the performance of other receiving antennas in the candidate receiving antenna set for receiving the signals of the terminal;
determining the number of times of selection of each receiving antenna in the first receiving antenna set, and selecting the determined number of receiving antennas from the first receiving antenna set according to the number of times of selection, wherein the first set number is not less than the determined number of receiving antennas.
In implementation, the signal determining module 303 is configured to:
determining a joint channel estimation matrix according to the selected respective channel estimation matrix of each receiving antenna;
determining a joint received signal vector according to the respective received signal of each selected receiving antenna;
and taking the joint channel estimation matrix and the joint receiving signal vector as input parameters of a detection algorithm, and detecting by adopting the detection algorithm to obtain data signals corresponding to a plurality of terminals for time-frequency resource multiplexing.
Wherein, the detection algorithm is a quasi-maximum likelihood ML algorithm or a maximum likelihood ML algorithm.
Specifically, the signal determination module 303 is configured to:
and respectively multiplying the selected respective channel estimation matrix of each receiving antenna by the element point of the corresponding position of the PDMA pattern matrix to obtain the joint channel estimation matrix.
In an implementation, the input conditions include any one or a combination of more than one of:
the method comprises the steps of detecting algorithm, modulation and coding mode of a terminal, wireless channel condition, overload rate of PDMA pattern matrix and interference level of adjacent cells.
In one implementation, the antenna number determining module 301 is configured to:
if the current input conditions corresponding to each terminal are different,
for each terminal, determining the number of first receiving antennas corresponding to the terminal when the current detection performance is met and the detection complexity is the lowest according to the corresponding relation between the preset detection performance and the detection complexity and the number of the receiving antennas corresponding to the current input condition corresponding to the terminal;
and selecting the maximum value in the number of the first antennas corresponding to each terminal, and determining the maximum value as the number of the corresponding receiving antennas meeting the current detection performance of each terminal and having the lowest detection complexity.
Based on the same inventive concept, embodiments of the present invention provide a base station, and specific implementation of the base station may refer to the description of the foregoing method embodiment, and repeated parts are not repeated, as shown in fig. 4, the base station mainly includes a processor 401 and a memory 402, where the memory 402 stores a preset program, and the processor 401 reads the program stored in the memory 402, and executes the following processes according to the program:
determining the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest;
selecting a receiving antenna from the candidate receiving antenna set according to the determined number of the receiving antennas;
respectively carrying out channel estimation on each selected receiving antenna to obtain a respective channel estimation matrix of each selected receiving antenna, and determining data signals corresponding to a plurality of terminals for carrying out time-frequency resource multiplexing according to the respective channel estimation matrix of each selected receiving antenna and the respective receiving signal of each selected receiving antenna, wherein the row of the channel estimation matrix represents multiplexed time-frequency resources, and the column of the channel estimation matrix represents a plurality of terminals multiplexed on a plurality of time-frequency resources corresponding to one row of the channel estimation matrix.
In implementation, the processor 401 determines, according to the preset corresponding relationship between the detection performance and the detection complexity and the number of receiving antennas, the number of receiving antennas corresponding to the lowest detection complexity and meeting the current detection performance; or, determining the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest according to the configuration parameters of the operation maintenance system.
In implementation, the processor 401 selects a number of receiving antennas from the candidate receiving antenna set according to the performance of each receiving antenna in the candidate receiving antenna set for receiving the signal of each terminal.
In one specific implementation, the processor 401 selects a first set number of receiving antennas corresponding to each terminal from the candidate receiving antenna set, respectively, to obtain a first receiving antenna set, where performance of the selected first set number of receiving antennas for receiving the signal of the terminal is better than performance of other receiving antennas in the candidate receiving antenna set for receiving the signal of the terminal; determining the number of times of selection of each receiving antenna in the first receiving antenna set, and selecting the determined number of receiving antennas from the first receiving antenna set according to the number of times of selection, wherein the first set number is not less than the determined number of receiving antennas.
In implementation, the processor 401 determines a joint channel estimation matrix according to the selected respective channel estimation matrix of each receiving antenna; determining a joint received signal vector according to the respective received signal of each selected receiving antenna; and taking the joint channel estimation matrix and the joint receiving signal vector as input parameters of a detection algorithm, and detecting by adopting the detection algorithm to obtain data signals corresponding to a plurality of terminals for time-frequency resource multiplexing.
Wherein, the detection algorithm is a quasi-maximum likelihood ML algorithm or a maximum likelihood ML algorithm.
Specifically, the processor 401 multiplies the selected respective channel estimation matrix of each receiving antenna by the element point at the corresponding position of the PDMA pattern matrix to obtain the joint channel estimation matrix.
Wherein the input condition comprises any one or combination of more of the following:
the method comprises the steps of detecting algorithm, modulation and coding mode of a terminal, wireless channel condition, overload rate of PDMA pattern matrix and interference level of adjacent cells.
In a specific implementation, if the current input conditions corresponding to each terminal are different, the processor 401 determines, for each terminal, the number of first receiving antennas corresponding to the terminal when the current detection performance is satisfied and the detection complexity is the lowest according to the preset corresponding relationship between the detection performance and the detection complexity and the number of receiving antennas corresponding to the current input conditions corresponding to the terminal; and selecting the maximum value in the number of the first antennas corresponding to each terminal, and determining the maximum value as the number of the corresponding receiving antennas meeting the current detection performance of each terminal and having the lowest detection complexity.
The bus architecture may include, among other things, any number of interconnected buses and bridges, with one or more processors, represented by a processor, and various circuits of memory, represented by memory, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor is responsible for managing the bus architecture and the usual processing, and the memory may store data used by the processor in performing operations.
Based on the technical scheme, in the embodiment of the invention, the base station determines the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest, selects the receiving antennas from the candidate receiving antenna set according to the determined number of the receiving antennas, and performs detection based on the channel estimation and the receiving signals of the selected receiving antennas to obtain the data signals corresponding to the multiple terminals for time-frequency resource multiplexing, so that the complexity of detecting the user data signals under the condition of multi-antenna receiving in the PDMA can be reduced under the condition of ensuring the detection performance.
As will be appreciated by one skilled in the art, embodiments of the present invention may 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 an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (16)
1. A method for detecting signals of multiple terminals in non-orthogonal multiple access (nonorthogonal multiple access), the method comprising:
the base station determines the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest;
the base station selects a receiving antenna from the candidate receiving antenna set according to the determined number of the receiving antennas;
the base station carries out channel estimation on each selected receiving antenna respectively to obtain a respective channel estimation matrix of each selected receiving antenna, and determines data signals corresponding to a plurality of terminals carrying out time-frequency resource multiplexing according to the respective channel estimation matrix of each selected receiving antenna and the respective receiving signal of each selected receiving antenna, wherein the row of the channel estimation matrix represents multiplexed time-frequency resources, and the column of the channel estimation matrix represents a plurality of terminals multiplexed on a plurality of time-frequency resources corresponding to one row of the channel estimation matrix;
the base station determines the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest, and the method comprises the following steps:
the base station determines the number of corresponding receiving antennas when the current detection performance is met and the detection complexity is the lowest according to the corresponding relation between the preset detection performance and the detection complexity corresponding to the current input condition and the number of the receiving antennas;
or,
and the base station determines the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest according to the configuration parameters of the operation maintenance system.
2. The method of claim 1, wherein the base station selecting a receive antenna from the set of candidate receive antennas based on the determined number of receive antennas comprises:
and the base station selects a plurality of receiving antennas of the determined receiving antennas from the candidate receiving antenna set according to the performance of each receiving antenna in the candidate receiving antenna set for respectively receiving the signal of each terminal.
3. The method as claimed in claim 2, wherein said base station selects said determined receiving antennas from said candidate receiving antenna set according to the performance of each receiving antenna in said candidate receiving antenna set for receiving the signal of each terminal respectively, comprising:
the base station selects a first set number of receiving antennas corresponding to each terminal from the candidate receiving antenna set respectively to obtain a first receiving antenna set, wherein the performance of the selected first set number of receiving antennas for receiving the signals of the terminal is superior to the performance of other receiving antennas in the candidate receiving antenna set for receiving the signals of the terminal;
the base station determines the selected times of each receiving antenna in the first receiving antenna set, and selects the determined receiving antennas with the number not less than the determined receiving antennas from the first receiving antenna set according to the selected times.
4. The method as claimed in any one of claims 1 to 3, wherein the determining, by the base station, the data signals corresponding to the plurality of terminals performing time-frequency resource multiplexing according to the selected respective channel estimation matrix of each receiving antenna and the selected respective receiving signal of each receiving antenna, comprises:
the base station determines a joint channel estimation matrix according to the selected respective channel estimation matrix of each receiving antenna;
the base station determines a joint received signal vector according to the respective received signal of each selected receiving antenna;
and the base station takes the joint channel estimation matrix and the joint receiving signal vector as input parameters of a detection algorithm, and the detection algorithm is adopted to detect and obtain data signals corresponding to a plurality of terminals for time-frequency resource multiplexing.
5. The method of claim 4, wherein the detection algorithm is a quasi-Maximum Likelihood (ML) algorithm or a Maximum Likelihood (ML) algorithm.
6. The method of claim 4, wherein the base station determining a joint channel estimation matrix based on the selected respective channel estimation matrix for each receive antenna, comprising:
and the base station multiplies the selected respective channel estimation matrix of each receiving antenna by the element point of the corresponding position of the pattern segmentation non-orthogonal multiple access PDMA pattern matrix to obtain the combined channel estimation matrix.
7. The method of claim 1, wherein the input conditions include any one or a combination of:
the method comprises the steps of detecting algorithm, modulation coding mode of a terminal, wireless channel condition, overload rate of a pattern segmentation non-orthogonal multiple access PDMA pattern matrix and interference level of an adjacent cell.
8. The method as claimed in claim 7, wherein if the current input conditions corresponding to each of the terminals are different, the determining, by the base station, the number of receiving antennas corresponding to the minimum detection complexity and meeting the current detection performance according to the preset correspondence relationship between the detection performance and the detection complexity corresponding to the current input conditions and the number of receiving antennas comprises:
the base station determines the number of first receiving antennas corresponding to the terminal when the current detection performance is met and the detection complexity is lowest according to the preset corresponding relation between the detection performance and the detection complexity and the number of the receiving antennas corresponding to the current input condition corresponding to the terminal;
and the base station selects the maximum value in the number of the first antennas corresponding to each terminal, and determines the maximum value as the number of the corresponding receiving antennas meeting the current detection performance of each terminal and having the lowest detection complexity.
9. A base station, comprising:
the antenna number determining module is used for determining the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest;
a selection module for selecting a receiving antenna from the candidate receiving antenna set according to the determined number of receiving antennas;
a signal determining module, configured to perform channel estimation on each selected receiving antenna, respectively, to obtain a respective channel estimation matrix of each selected receiving antenna, and determine, according to the respective channel estimation matrix of each selected receiving antenna and the respective received signal of each selected receiving antenna, data signals corresponding to multiple terminals performing time-frequency resource multiplexing, where a row of the channel estimation matrix represents a multiplexed time-frequency resource, and a column of the channel estimation matrix represents multiple terminals multiplexed on multiple time-frequency resources corresponding to a row of the channel estimation matrix;
wherein the antenna number determination module is configured to:
determining the number of corresponding receiving antennas when the current detection performance is met and the detection complexity is the lowest according to the corresponding relation between the preset detection performance and the detection complexity corresponding to the current input condition and the number of the receiving antennas;
or,
and determining the number of receiving antennas which meet the current detection performance and enable the detection complexity to be the lowest according to the configuration parameters of the operation maintenance system.
10. The base station of claim 9, wherein the selection module is to:
and selecting a plurality of receiving antennas of the determined receiving antennas from the candidate receiving antenna set according to the performance of each receiving antenna in the candidate receiving antenna set for respectively receiving the signal of each terminal.
11. The base station of claim 10, wherein the selection module is to:
respectively selecting a first set number of receiving antennas corresponding to each terminal from the candidate receiving antenna set to obtain a first receiving antenna set, wherein the performance of the selected first set number of receiving antennas for receiving the signals of the terminal is superior to the performance of other receiving antennas in the candidate receiving antenna set for receiving the signals of the terminal;
determining the number of times of selection of each receiving antenna in the first receiving antenna set, and selecting the determined number of receiving antennas from the first receiving antenna set according to the number of times of selection, wherein the first set number is not less than the determined number of receiving antennas.
12. The base station of any of claims 9-11, wherein the signal determination module is to:
determining a joint channel estimation matrix according to the selected respective channel estimation matrix of each receiving antenna;
determining a joint received signal vector according to the respective received signal of each selected receiving antenna;
and taking the joint channel estimation matrix and the joint receiving signal vector as input parameters of a detection algorithm, and detecting by adopting the detection algorithm to obtain data signals corresponding to a plurality of terminals for time-frequency resource multiplexing.
13. The base station of claim 12, wherein the detection algorithm is a quasi-Maximum Likelihood (ML) algorithm or a Maximum Likelihood (ML) algorithm.
14. The base station of claim 12, wherein the signal determination module is to:
and respectively multiplying the selected respective channel estimation matrix of each receiving antenna by the element point of the corresponding position of the pattern segmentation non-orthogonal multiple access PDMA pattern matrix to obtain the joint channel estimation matrix.
15. The base station of claim 9, wherein the input conditions comprise any one or a combination of:
the method comprises the steps of detecting algorithm, modulation coding mode of a terminal, wireless channel condition, overload rate of a pattern segmentation non-orthogonal multiple access PDMA pattern matrix and interference level of an adjacent cell.
16. The base station of claim 15, wherein the antenna number determination module is configured to:
if the current input conditions corresponding to each terminal are different,
for each terminal, determining the number of first receiving antennas corresponding to the terminal when the current detection performance is met and the detection complexity is the lowest according to the corresponding relation between the preset detection performance and the detection complexity and the number of the receiving antennas corresponding to the current input condition corresponding to the terminal;
and selecting the maximum value in the number of the first antennas corresponding to each terminal, and determining the maximum value as the number of the corresponding receiving antennas meeting the current detection performance of each terminal and having the lowest detection complexity.
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