CN101834649B - Random data joint detection method for multi-antenna cooperative communication system - Google Patents

Random data joint detection method for multi-antenna cooperative communication system Download PDF

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CN101834649B
CN101834649B CN2010101516688A CN201010151668A CN101834649B CN 101834649 B CN101834649 B CN 101834649B CN 2010101516688 A CN2010101516688 A CN 2010101516688A CN 201010151668 A CN201010151668 A CN 201010151668A CN 101834649 B CN101834649 B CN 101834649B
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梅中辉
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南京邮电大学
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用于多天线协作通信系统中的随机数据联合检测方法是一种用于多天线协作通信系统的信号检测方法,确切地说,涉及一种两阶段MIMO协作通信系统的检测方法,该方法考虑一个两阶段协作通信系统,系统包括一个信源节点,一个转发节点和一个接收节点,并且所有节点均安装有多根天线,利用多天线技术所提供的空间复用增益,为抑制干扰量,分别在转发节点端和基站端使用PDA检测器来进行信号检测,转发节点利用PDA检测器所提供的信息来决定是否转发其所检测的信息;当转发节点对所检测的信息进行转发时,可以在接收节点端使用两个级联的PDA检测器来进行迭代检测,本系统分为转发节点端和接收节点端两个部分,提高MIMO协作通信系统数据链路可靠性能。 A method for joint detection random data cooperative multi-antenna communication system is a multi-antenna signal detection method for cooperative communication systems and, more particularly, to a method for detecting a two-stage cooperative MIMO communication system, the method considers a stage two cooperative communication system, the system comprising a source node, a forwarding node and a receiving node, and all nodes are installed with multiple antennas, multiple antennas using space multiplexing technology provides gain for suppressing the interference amount, respectively, forwarding node and the base end side using a PDA detector is used for signal detection, forwarding node using the information provided by the PDA detector to determine whether to forward the information it detected; when forwarding node forwarding the detected information, may be received end node using two cascaded iterative PDA detector to detect, the present system is divided into a forwarding node and a receiving node ends of the two end portions, to improve the cooperative MIMO communication system, a data link reliability.

Description

用于多天线协作通信系统中的随机数据联合检测方法 Joint detection method for a multi-antenna random data cooperative communication system

技术领域 FIELD

[0001] 本发明设计一种用于多天线协作通信系统的信号检测方法,确切地说,涉及一种两阶段MMO协作通信系统的检测方法,属于无线通信中的协作通信领域。 [0001] The design of the present invention A signal detecting method for cooperative multi-antenna communication system and, more particularly, to a method for detecting a two-stage MMO cooperative communication system, the field of communications cooperative wireless communication.

背景技术 Background technique

[0002] 协作通信系统中的移动终端可以共享它们的物理资源来相互转发信息,使得同一信息可通过不同的独立无线信道到达接收端,从而可获得协作通信增益。 [0002] The mobile terminal cooperative communication system can share their information with each physical resource to forward, so that the same radio channel information may reach the receiver via different independent, cooperative communication gain can be obtained thereby. 利用协作通信技术可以减少发射端的发射信号功率或提高网络覆盖面积。 Using cooperative communication technology can reduce transmit power of the transmitter signal or to increase the coverage area. 而MIMO系统(多天线通信系统) 也可以利用空间分集技术来提高系统性能,因而当前许多学者考虑将MMO技术和协作通信技术相结合,提出MMO协作通信系统。 The MIMO system (multiple-antenna communication system) may also use the spatial diversity technique to improve system performance, and thus this technique many researchers consider the MMO and cooperative communication technology, proposes MMO cooperative communication system.

[0003] 对于点到点的MMO系统,可以用MMO技术来提高信道容量,也可以用MMO技术来提高信道传输数据的可靠性,降低误码率。 [0003] For point of MMO system, MMO techniques can increase the channel capacity, MMO techniques can also be used to improve the reliability of data transmission channel, the BER is reduced. 前者利用MIMO系统提供的空间复用增益;后者利用MMO系统提供的分集增益。 The former system provides a MIMO spatial multiplexing gain; MMO which use diversity gain provided by the system. 当利用MMO系统的空间复用增益来提高信道容量时,发射端的不同发射天线发送不同的信号,对于其中某一发射天线所发射的信号而言,其它发射天线所发射的信号在接收端相叠加会形成多天线干扰,多天线干扰的存在严重影响着MIMO系统的系统性能,抑制多天线干扰则可相应提闻系统性能。 When the MMO system using spatial multiplexing to increase the channel capacity gain, the different transmitter antennas transmit different transmitted signals, wherein the signal emitted by a transmitting antenna, the transmit antennas transmit other signals superposed receiving end will form a multi-antenna interference, there are multiple antenna interference seriously affect the performance of the MIMO system, a multi-antenna interference suppression can provide the respective performance smell.

[0004] 对于MMO协作通信系统,不仅接收节点可以接收到信源节点发射的信号,而且转发节点也可以接收到信源节点发射的信号。 [0004] MMO for cooperative communication system, the receiving node can not receive the signal emitted by the source node and the forwarding node may also receive the signal emitted by the source node. 因而,在MMO协作通信系统中,当利用MMO系统所提供的空间复用增益时,不仅在接收节点端存在干扰量,而且在转发节点端也存在干扰量,可相应考虑在接收节点端和转发节点端采用检测技术来抑制干扰,从而可以相应提高系统性能。 Accordingly, the MMO cooperative communication system, when the use of space MMO system provides multiplexing gain, not only the amount of interference at the receiving node side, but there is the interference quantity in the forwarding node side, correspondingly considered in the receiving node side and forward end node detection technique employed to suppress interference, can be a corresponding increase in system performance. 并且转发节点端检测算法的检测性能也影响协作通信系统的转发策略,如果转发节点端的检测性能不可靠,则转发节点所转发的信号在接收节点端会引起“错误传播”现象,反而会使系统性能明显下降。 And forwarding node-side detection algorithm to detect performance also affects the forwarding policy cooperative communication system, if detection performance forwarding node side is not reliable, then forwards the signal node forwarded at the receiving node side could cause an "error propagation" phenomenon, but will make the system noticeable performance degradation.

[0005] 最大后验概率检测算法可取得最优的检测性能,但其计算复杂度随发射天线数和信号调制星座点数呈指数级增长,难以在实际系统中得到应用。 [0005] The maximum a posteriori detection algorithm may achieve optimal detection performance, but the computational complexity with the number of transmit antennas and a signal modulation constellation points exponentially, difficult to apply in a practical system. Batu等学者在“IEEECommun. Lett. , 2009,13 (5) :330_332” 上所发表的文章“Performanceanalysis of linearreceivers in a MIMO relaying system”中考虑在MIMO协作通信系统的转发节点端和接收节点端使用解相关检测算法来抑制干扰量,并分析了该系统的性能。 Batu other scholars "IEEECommun Lett, 2009,13 (5):.. 330_332" published articles on "Performanceanalysis of linearreceivers in a MIMO relaying system" are contemplated for use in cooperative MIMO communication system forwarding node and receiver node side decorrelation detection algorithm to suppress the interference amount, and analyzes the performance of the system. 这种技术的缺点是:解相关检测算法属于线性检测算法,虽然计算复杂度较低,但其性能也较最优检测算法明显下降。 A disadvantage of this technique is: decorrelating detector algorithm is linear detection algorithms, although low computational complexity, but its performance is decreased compared with the optimum detection algorithm. 并且该检测算法输出的是硬判决信息,无法获得检测数据的检测可靠度信息,即无法为协作通信系统的转发策略提供有效参考信息。 And the detection algorithm output is the hard decision information can not be obtained reliability information data detected by the detector, i.e. not provide a valid reference information forwarding cooperative communication system.

[0006] PDA 检测算法为Luo 等学者在“IEEE Commun. Lett. ,2001,5(9) :361_363” 上发表的论文“Near-optimal Multiuser Detection in Synchronous CDMA UsingProbabilisticData Association”中提出用来抑制CDMA系统中的多址干扰,后来Liu Shoumin等学者在“IEEE Trans. Signal Process. ,2004,52(3) :721_732”上发表的论文“Near-optimum softDecision Equalization for FrequencySelective MIMO Channels” 中将PDA 算法应用于MIMO检测,该算法可取得接近于最优算法的系统性能,计算复杂度仅与用户数或天线数目的立方成正比,受到了当前学者的广泛关注。 [0006] PDA detection algorithm Luo et scholars "IEEE Commun Lett, 2001,5 (9):.. 361_363" published in the paper "Near-optimal Multiuser Detection in Synchronous CDMA UsingProbabilisticData Association" in a CDMA system is proposed to suppress the MAI, and later Liu Shoumin and other scholars in "IEEE Trans Signal Process, 2004,52 (3):.. 721_732" "Near-optimum softDecision Equalization for FrequencySelective MIMO Channels" PDA algorithm will be published in the paper used in MIMO detection, the algorithm can be made close to the optimal performance of the algorithm, the computational complexity is only proportional to the cube of the number of antennas or the number of users, by the current attention of researchers. 并且PDA检测算法可输出检测信号的检测可靠度信息,可以利用该信息来决定是否允许转发节点参与协作通信。 PDA detection and reliability information detection algorithm may output the detection signal, can use this information to decide whether to allow a forwarding node participating in the cooperative communication. 因此,本发明考虑在MIMO协作通信系统的转发节点端和接收节点端使用PDA检测算法来抑制干扰量。 Accordingly, the present invention contemplates the use of an amount of interference is suppressed PDA detection algorithm in the forwarding node and the receiver node side cooperative MIMO communication system. 相对于点到点的MMO系统中的PDA检测算法,本方法必须考虑如下两个问题: PDA detection algorithm MMO point to point system with respect to the present method must consider the following two questions:

[0007] (I)如何利用转发节点端PDA检测器所输出的信息来确定信号转发策略。 [0007] (I) how forwarding node of PDA detector output signals to determine a forwarding policy. 由于转发节点端的PDA检测器可以输出发送符号的检测可靠度信息,为避免在接收节点端引起“错误传播”现象,当且仅当转发节点端被检测数据具有一定的检测可靠度时,转发节点才将所检测的数据发送至接收节点端。 Since the end of node may transponder PDA detector outputs the detection reliability information transmission symbol, in order to avoid causing the receiving node side "error propagation" phenomenon, if and only if the end of the test data forwarding node has a certain degree of detection reliability, the forwarding node only the detected data is sent to the receiving node side.

[0008] (2)接收节点端如何利用所接收的信息进行信号检测。 [0008] (2) how the receiving end node detects a signal using the received information. 对于点到点的MIMO系统,接收节点仅收到信源节点所发送的信息。 For point MIMO system, the receiving node receives the information signal transmitted by the source node only. 而对于MIMO协作通信系统,当转发节点处于激活状态时,接收节点不仅接收到信源节点所发送的信息,而且可以接收到转发节点所转发的信息,必须考虑如何综合利用这两方面的信息来进行信号检测。 For cooperative MIMO communication system, when the forwarding node is active, the receiving node receives not only the information signal sent from the source node, the forwarding information may be received and forwarded by the node, we must consider how to integrate information both to signal detection.

发明内容 SUMMARY

[0009] 技术问题:本发明的目的是提供一种用于多天线协作通信系统中的随机数据联合检测方法,可以抑制转发节点端和接收节点端的干扰量,从而可以达到提高MIMO协作通信系统数据链路可靠性能的目的。 [0009] Technical Problem: The purpose of the present invention is to provide a method for joint detection of random data in a multiple antenna system for cooperative communication, interference amount forwarding node and the receiver node side can be suppressed, thereby to improve the cooperative MIMO data communications system link reliability energy purposes.

[0010] 技术方案:本发明考虑一个两阶段协作通信系统,系统包括一个信源节点,一个转发节点和一个接收节点,并且所有节点均安装有多根天线,利用多天线技术所提供的空间复用增益,为抑制干扰量,分别在转发节点端和基站端使用PDA检测器来进行信号检测,转发节点利用PDA检测器所提供的信息来决定是否转发其所检测的信息;当转发节点对所检测的信息进行转发时,可以在接收节点端使用两个级联的PDA检测器来进行迭代检测,本系统分为转发节点端和接收节点端两个部分: [0010] Technical Solution: The present invention contemplates a two-stage cooperative communication system, the system comprising a source node, a forwarding node and a receiving node, and all nodes are installed with multiple antennas, multiple antennas using space multiplexing technology offers gain, to suppress an amount of interference at each forwarding node using a base station and a terminal end PDA detector is used for signal detection, forwarding node using the information provided by the PDA detector to determine whether to forward the information it detected; if the forwarding node when detected information is forwarded can use two cascaded PDA detector at the receiving end to perform iterative detection node, the system is divided into a forwarding node and a receiving node ends of the two end portions:

[0011] 第一,转发节点端包括下列操作步骤: [0011] First, the end node comprises forwarding the following steps:

[0012] I. I)利用PDA检测器对所接收的数据进行信号检测,在协作通信的第一阶段,转发节点接收到来自信源节点所发送的数据,假设转发节点端知道信源节点与转发节点间的MIMO信道信息,可利用PDA检测器对所接收的数据进行信号检测; [0012] I. I) using a PDA detector on the received data signal detection in the first stage of cooperative communication, forwarding node receiving incoming data transmitted from the source node confidently assumed that the UE knows the source node forwarding node MIMO channel information between forwarding node, the received data may be detected using a PDA detector signal;

[0013] I. 2)决定转发策略,PDA检测器输出被检测数据的检测可靠度信息,预先给定一个阈值,当PDA检测器输出的所有检测数据的检测可靠度均大于所给定的阈值时,转发节点在协作通信的第二阶段便将所检测的数据转发至接收节点端;否则,转发节点在协作通信的第二阶段对所检测的信息不进行转发; [0013] I. 2) forwarding decisions, PDA detector outputs the detected detection data reliability information, a predetermined threshold value, if all of the detection reliability of the detected data output from the PDA detector greater than a given threshold value when forwarding node detected put in the second stage of the cooperative communication node forwards the data to the receiving terminal; otherwise, the information forwarding node does not forward the detected coordinated communication in a second stage;

[0014] 第二,假设接收节点端知道信源节点与接收节点间的MIMO信道信息,以及转发节点与接收节点间的MIMO信道信息,接收节点端将包括下列操作步骤: [0014] Second, the receiving node side is assumed to know the MIMO channel information between MIMO channel information between the source node and the receiving node, and forwarding and receiving nodes, the receiving node side will include the following steps:

[0015] 2. I)当转发节点在协作通信的第二阶段没有被激活时,接收节点只能接收到来自信源节点所发送的信息,PDA检测器将根据该信息来进行信号检测, [0015] 2. I) when forwarding node is not activated in the second stage cooperative communication, the receiving node can receive incoming information sent from the source node confidence, PDA to the detector detects a signal based on the information,

[0016] 2. 2)当转发节点在协作通信的第二阶段被激活时,接收节点不仅在协作通信的第一阶段接收到信源节点所发送的信息,而且在协作通信的第二阶段接收到转发节点所转发的信息,此时迭代检测器结构由两个级联的PDA检测器组成,可利用该迭代检测器来进行信号检测。 [0016] 2.2) is activated when the forwarding node cooperative communication in the second stage, the receiving node receives not only in the first stage to the cooperative communication information signal sent by the source node, and the receiving cooperative communication in the second stage information forwarded to the forwarding node, and the iterator detector structure consists of two cascaded composition PDA detector may be utilized to perform the iterative detector signal detection.

[0017] 步骤2. 2)所述的利用两个级联的PDA检测器来进行信号检测包括以下操作步骤: [0017] Step 2. 2) utilizes two cascaded PDA detector is used for signal detection comprising the steps:

[0018] 2. 2a)PDA-I检测器将PDA-II检测器所输出的信息作为发送符号的先验信息,利用接收节点端在协作通信的第一阶段从信源节点所接收的信息来进行信号检测,并且输出软信息; [0018] 2. 2a) PDA-I detector PDA-II information of the detector output as a priori information about the transmitted symbols, the receiving node using the information in the first stage cooperative communication terminal received from the source node signal detection, and outputs soft information;

[0019] 2. 2b)PDA-II检测器将PDA-I检测器所输出的信息作为发送符号的先验信息,利用接收节点端在协作通信的第二阶段从转发节点所接收的信息来进行信号检测,并且输出软信息; [0019] 2. 2b) PDA-II information detector PDA-I detector output as a priori information about the transmitted symbols, an end node using the received information to be received from the forwarding node in the second stage of cooperative communication signal detection, and outputs soft information;

[0020] 2. 2c)当系统没有达到所给定的最大迭代运算次数时,转至步骤2. 2a); [0021] 2. 2d)当系统达到最大迭代运算次数时,根据PDA-I检测器和PDA-II检测器输出的软信息对发送符号进行硬判决。 [0020] 2. 2c) when a given maximum number of iterations has not reached computing system, go to step 2. 2a); [0021] 2. 2d) When the system reaches the maximum number of iterations operation detector according PDA-I soft information and PDA-II detector outputs a hard decision on the transmitted symbols.

[0022] 利用多天线技术所提供的空间复用增益,即信源节点的每根发射天线均发送不同的数据,转发节点的每根发射天线也均发送不同的数据。 [0022] The multi-antenna technique using spatial multiplexing gain provided, i.e., each source node transmit antennas are transmitting different data, each transmit antenna transmits a forwarding node can have different data.

[0023] 考虑一个两阶段协作通信系统,在协作通信的第一阶段,信源节点发送数据至转发节点和接收节点端;在协作通信的第二阶段,如果转发节点处于激活状态,其将所检测的信息转发至接收节点端。 [0023] Consider a two-phase system cooperative communication, in the first stage of cooperative communication, the source node transmits data and a receiving node to the end node forwarding; cooperative communication in a second stage, if the forwarding node is active, it will be the forwards the detected information to the receiving node side.

[0024] 系统包括一个信源节点,一个转发节点和一个接收节点,该检测方法可被推广至有多个转发节点的多天线协作通信系统中,此时转发节点的转发策略同权利要求I中的步骤I. 2)。 [0024] The system includes a source node, a forwarding node and a receiving node, this detection method can be extended to multi-antenna communication system with a plurality of cooperative forwarding nodes, forwarding the same in this case I as claimed in claim forwarding node step I. 2).

[0025] 分别在转发节点端和基站端使用PDA检测器来进行信号检测,该方法同样适用于码分多址协作通信系统,在两阶段CDMA协作通信系统中,同样可考虑在转发节点端和接收节点端使用PDA检测器来抑制多址干扰,从而可以提高系统性能。 [0025] In each forwarding node and the base end side using a PDA detector is used for signal detection, the method is equally applicable to CDMA communications systems cooperative, two-stage cooperative CDMA communication system, the forwarding node could be considered the same end and the receiving node side using a PDA detector is used to suppress multiple access interference, thus improving system performance.

[0026] 步骤2. 2)所述迭代检测器结构由两个级联的PDA检测器组成,该结构可以被推广至用任何两个软输入软输出检测器级联组成迭代检测器,用两个最大后验概率(maximum aposteriori, MAP)检测器级联,或用一个PDA检测器和一个MAP检测器级联。 [0026] Step 2.2) the iterative detector structure consists of two cascaded PDA detector composition, the structure can be generalized to any two input soft output detector cascaded iterative detector, with two a maximum a posteriori (maximum aposteriori, MAP) detector cascaded or cascaded with a PDA detector and a MAP detector.

[0027] 有益效果: [0027] beneficial effects:

[0028] 第一,本发明考虑在转发节点端和基站端使用PDA检测算法来抑制干扰量,PDA检测算法可取得逼近于最优检测算法的系统性能,并且计算复杂度仅与天线数的立方成正比。 [0028] First, the present invention contemplates to suppress interference in the detection algorithm used in an amount PDA forwarding node and the base station side terminal, PDA detection algorithm can be made to approach the optimal performance of the detection algorithm, and calculates the cubic complexity and the number of antennas is only proportional.

[0029] 第二,PDA检测算法可以输出软信息,即信号的检测可靠度信息,可将转发节点端所有检测数据的检测可靠度信息与一个预先设定阈值相比较,当且仅当所有的被检测数据具有较高的检测可靠度时,转发节点才在协作通信的第二阶段将所检测的数据转发至接收节点端,从而可以尽量避免转发节点因转发不可靠的检测数据在接收节点端引起“错误传播”现象。 [0029] Second, PDA detection algorithm may output soft information, i.e. the reliability of the information detection signal, the node may forward end detection reliability information with a predetermined threshold value comparing all the detection data, if and only if all of the detected data is forwarded with high detection reliability forwarding node only in the second phase of the detected cooperative communication data to the receiving terminal node, the forwarding node can be avoided because the forwarding unreliable detection data at the receiving node side cause "error propagation" phenomenon.

[0030] 第三,当转发节点参与协作通信时,接收节点端在协作通信的第一阶段可接收到来自信源节点所发送的信息,在协作通信的第二阶段可接收到来自转发节点所发送的信息,可用两个PDA检测器分别根据这两个接收信号来进行信号检测,并且利用PDA检测器的软输入软输出特性,将两个PDA检测器级联组成迭代接收机,随着迭代次数的增加,系统可相应获得更好的性能。 [0030] Third, when forwarding node participating in the cooperative communication, the receiving node side at the first stage of the cooperative communication may receive incoming information sent by the source node of confidence, in a second stage the cooperative communication may be received from a forwarding node soft-input soft-output characteristic information transmitted, the available detectors are two PDA these two received signals performs the signal detection, and with PDA detector, the two detectors PDA cascaded iterative receiver, with iteration the number increases, the system may correspond to better performance.

[0031 ] 第四,本发明同样可被应用于CDMA协作通信系统中,在CDMA协作通信系统中,其转发节点端和接收节点端存在多址干扰,可在转发节点端使用PDA检测器进行信号检测,在接收节点端使用两个级联的PDA检测器进行信号检测,从而可以达到抑制干扰量,提高系统性能的目的。 [0031] Fourth, the present invention may equally be applied to CDMA communications systems cooperative, cooperative communication in a CDMA system, there are multiple access interference which forwarding node and the receiver node side, may be used in the PDA detector end signal forwarding node detection, signal detection at the receiving end node using two cascaded PDA detector, which can inhibit the amount of interference, the purpose of improving system performance.

附图说明 BRIEF DESCRIPTION

[0032] 图I为所给出的MIMO协作通信系统模型。 [0032] Figure I is a cooperative MIMO communication system model given. 该系统中包括一个信源节点,一个转发节点和一个接收节点,所有的节点均安装有多根天线。 The system includes a source node, a forwarding node and a receiving node, all nodes are installed with multiple antennas.

[0033]图2为本发明转发节点端和接收节点端的工作流程图。 [0033] FIG. 2 is a flow chart of a forwarding node and the receiver node side of the present invention.

[0034]图3为转发节点端的PDA检测器。 [0034] FIG. 3 is a repeater node side PDA detector. 在协作通信的第一阶段,转发节点接收来自信源节点所发送的数据,并对所接收的数据进行信号检测,当且仅当被检测信号具有较高的检测可靠度时,转发节点才将所检测的信号转发至接收节点端。 In the first stage of cooperative communication, forwarding node receives a data signal transmitted from the source node, and the received data signal is detected, and only when the detected signal has a high degree of detection reliability, the forwarding node only the detected signal is forwarded to the receiving node side.

[0035] 图4为接收节点端两个相互级联的PDA检测器。 [0035] FIG. 4 is a receiving node ends of two mutually cascaded PDA detector. 当转发节点没有被激活时,接收节点端仅能在协作通信的第一阶段收到来自信源节点发送的数据,可使用PDA检测器对所接收数据进行信号检测;当转发节点被激活时,接收节点不仅在协作通信的第一阶段可接收到来自信源节点所发送的数据,而且在协作通信的第二阶段可接收到来自转发节点所发送的数据,可利用两个PDA检测器分别根据这两个接收数据来进行信号检测,并且可以借鉴于Turbo码迭代译码思想,将这两个检测器进行级联组成迭代接收机。 When not activated the forwarding node, the receiving node receives the data side only transmitted from the source node in a first stage of cooperative communication, can be used for the PDA detector detects the received data signal; when forwarding node is activated, a receiving node in a first stage only cooperative communication confidence may receive incoming data sent by the source node, and in the second stage cooperative communication may receive data transmitted from the forwarding node, may utilize two detectors, respectively, according to PDA both received data signal is detected, and can draw on iterative decoding Turbo thinking, these two detectors be cascaded iterative receiver.

[0036] 图5为系统性能仿真结果图。 [0036] FIG. 5 shows a simulation result for the system performance. 其中所有节点的天线数目均为4,信源节点和转发节点的发射信号功率相等,PDA检测器的总的迭代运算次数为3,设定可靠度阈值为10. 5。 Wherein the number of antennas 4 are all nodes, the transmission signal power is equal to the source node and the forwarding node, the total number of iterations for computing the PDA detector 3, setting the reliability threshold is 10.5.

[0037] 图6为选择不同可靠度阈值时的系统性能仿真结果图。 [0037] FIG. 6 shows a simulation result when the system performance for a selection of the reliability threshold.

具体实施方式 Detailed ways

[0038] 为使本发明的目的,技术方案和优点更加清楚,下面结合附图对本发明作进一步的详细描述。 [0038] To make the objectives, technical solutions, and advantages of the invention more apparent, the accompanying drawings The present invention will be further described in detail with. 但本发明的保护范围不限于下述的实施示例。 However, the scope of the present invention is not limited to the embodiment examples below.

[0039] 图I给出了发明所采用的MMO协作通信系统模型。 [0039] Figure I shows the MMO cooperative communication system model used in the invention.

[0040] 该MMO协作通信系统模型包括一个信源节点,一个转发节点和一个接收节点。 [0040] The MMO cooperative communication system model comprises a source node, a forwarding node and a receiving node. 信源节点,转发节点和接收节点分别具有Ns,Ne和Nd根天线。 The source node, the forwarding and receiving nodes respectively have Ns, Ne and Nd antennas. 用Hsr ,HSD e和Hrd 分别表示信源节点与转发节点,信源节点与接收节点,和转发节点与接收节点间的MIMO信道,并假设它们均为块衰落瑞利MIMO信道,Hse, Hsd和Hkd中元素均被建模成均值为O方差为I的复高斯随机变量。 With Hsr, HSD e and Hrd represent MIMO channel between the source node and the forwarding node, the source node and the receiving node, and forwarding and receiving nodes, and assuming that they are block fading Rayleigh MIMO channels, Hse, Hsd and Hkd elements are modeled as a mean variance I O complex Gaussian random variables. 用cSK,cSD和Ced分别表示信源节点与转发节点,信源节点与接收节点,和转发节点与接收节点间与距离相关的信道衰落系数。 With CSK, CSD and Ced denote the source node and the forwarding node, the source node and the receiving node, and forwarding and receiving nodes between the distance-related channel fading coefficients. 用Ps和Pk分别表示信源节点和转发节点端的发射信号功率。 Transmit signal power represent the source node and the forwarding node and ends with Ps Pk. 本发明考虑一个两阶段协作通信系统模型,在协作通信的第一阶段,信源节点发送信号至转发节点端和接收节点端,用\~<(0,1_];;)和 The present invention contemplates a two-stage model of cooperative communication system, in a first stage of cooperative communication, the source node sends a signal to the forwarding node and the receiver node side, with \ ~ <(0,1_] ;;) and

来分别表示转发节点端和接收节点端的信道噪声, Channel noise is represented forwarding node and the receiver node side, respectively,

[0041] χ = ,χ2,···,\]Τ为信源节点所发送的信号,为简便,我们可假定其为BPSK调制符号,则转发节点端和接收节点端所接收的信号可被分别表示为: [0041] χ =, χ2, ···, \] Τ a signal transmitted by the source node, for simplicity, we assumed to be BPSK modulation symbols, the forwarding node and the receiver node side signal can be received It is expressed as:

Figure CN101834649BD00081

[0044] 在协作通信的第二阶段,如果转发节点处于激活状态,其将所检测的信息转发至接收节点端,用卜[^_-,\]7表示转发节点端被检测信号的硬判决值,<〜均(0,1^。)表示接收端的信号噪声,则接收节点端所接收的信号可被表示为 [0044] In the second stage of cooperative communication, if the forwarding node is active, which forwards the detected information to the receiving terminal node, [_- ^, \] 7 represents a hard decision signal forwarding node terminal is detected by the BU value <~ average (0,1 ^) represents a noise signal receiving end, the signal received by the node receiving terminal may be expressed as

[0045] [0045]

[0046] 图2给出了本发明转发节点端和接收节点端的工作流程图。 [0046] Figure 2 shows a flow chart of the present invention, the forwarding node and the receiver node side.

[0047] 转发节点端工作流程的操作步骤: [0047] The forwarding node side workflow steps:

[0048] 步骤(I)转发节点端的PDA信号检测。 [0048] Step (I) PDA detection signal forwarding node side. 当对发送数据Xk进行信号检测时,可相应将转发节点端的接收数据表示为: When receiving data transmission data Xk signal detection, may correspond to the forward end nodes is expressed as:

Figure CN101834649BD00082

[0051] 上式中 [0051] In the above formula

Figure CN101834649BD00083

表示检测Xk时转发节点端的干扰量和信道噪声。 End node forwarding the amount of interference and channel noise indicates the detection Xk. PDA检测算法的基本思想是用多维高斯分布函数来逼近干扰量和信道噪声,即有 PDA detection algorithm The basic idea is to use a multi-dimensional Gaussian distribution function to approximate the amount of interference and channel noise, that is

Figure CN101834649BD00084

,K和方差Qk,K可被分别表示为 , K and the variance Qk, K may be denoted as

Figure CN101834649BD00085

[0057] 上面两式中E{Xj}可以根据上次迭代运算过程中PDA检测器的输出结果来进行信号估值,即有 [0057] The above two formulas E {Xj} can be valued in accordance with the signal output of the previous iteration process PDA detector, that is

Figure CN101834649BD00086

[0058] 通过上述高斯逼近,PDA检测器的输出结果可被表示为 [0058] Through the above Gaussian approximation, the output PDA detector may be expressed as

[0059] [0059]

Figure CN101834649BD00087
Figure CN101834649BD00091

[0062] PDA检测器的执行过程是一个迭代运算过程,迭代运算次数越高,对发送信息的检测可靠度也相应越高,但计算复杂度也相应增大。 Execution [0062] PDA detector is an iteration process, the higher the number of iterations operation, a corresponding higher detection reliability information is transmitted, but also increase the computational complexity. 在每次迭代运算过程中,PDA检测器可以利用上次迭代运算的输出结果来对Elxj进行重新估值。 In each iteration process, PDA detector may use revaluation of Elxj output of the last iteration. 在最后一次迭代运算过程中,对发送符号进行硬判决,即有 In the last iteration process, the transmitted symbol hard decision, that is

Figure CN101834649BD00092

[0063] 步骤(2)决定转发策略。 [0063] Step (2) forwarding policy decisions. 为避免转发节点所转发的信号在接收节点端引起“错误传播”现象,当且仅当转发节点被检测的信号具有较高的检测可靠度时,所检测的信息才在协作通信的第二阶段被转发至接收节点端;否则转发节点在协作通信的第二阶段处于非激活状态。 To avoid forwarding node forwarding the signal at the receiving end due to node "error propagation" phenomenon, if and only if the node is forwarding the detection signal having a high detection reliability information detected only in the second stage of cooperative communication It is forwarded to the receiving node side; otherwise, the forwarding node inactive cooperative communication in a second stage. 很明显,PDA检测器软输出的绝对值|Lk,KitOT|越大,对应的检测信号Xk的检测可靠度越高。 Obviously, the absolute value of the soft output detector PDA | Lk, KitOT | greater Xk detection signal corresponding to the detection reliability is higher. 因此,我们可以将PDA检测器的输出结果与一个给定的阈值Ytl相比较来判决被检测信号是否具有较高的检测可靠度。 Thus, we can output PDA detector and a given threshold value decision Ytl comparing the detected signal has a high detection reliability. 用二进制符号Bk表示转发节点是否处于激活状态,则有 Bk binary notation indicating whether the forwarding node is active, there

[0064] [0064]

Figure CN101834649BD00093

[0065] 接收节点端工作流程的操作步骤: [0065] Procedure workflow terminal receiving node:

[0066] 步骤⑴转发节点处于非激活状态时(Bk = O)接收节点端的PDA信号检测。 [0066] Step PDA detection signal when the receiving node side ⑴ forwarding node in the inactive state (Bk = O). 此时接收节点端仅能接收到信源节点所发送的数据,PDA信号检测器的工作过程同转发节点端的PDA信号检测器类似,只是此时的接收数据为y/而不是yK,为简便,我们将不重复叙述该过程。 At this time, the receiving side can only receive the data node the source node transmitted, during operation with PDA detector signal forwarding node PDA terminal signal detector similar, except that received data at this time is y / yK instead, for simplicity, we will not repeat the description of the process.

[0067] 步骤⑵转发节点处于激活状态时(Bk = I)接收节点端的PDA信号检测。 PDA detection signal when the [0067] Step ⑵ forwarding node is active (Bk = I) the receiving node side. 此时接收节点端在协作通信的第一阶段可以接收到来自信源节点端所发送的数据;在协作通信的第二阶段可以接收到来自转发节点端所转发的数据。 In this case the receiving node side at the first stage may receive incoming cooperative communication confidence data transmitted by the source node side; cooperative communication in the second stage to the forwarding node may receive from the terminal the forwarded data. 我们可以用PDA-I检测器和PDA-II检测器级联组成迭代检测器来进行信号检测,该检测器的工作过程包括如下操作步骤: We can use the PDA-I detector and PDA-II detector cascaded iterative detector is used for signal detection, during operation of the detector comprising the steps:

[0068] 步骤(2a)PDA_I检测器将PDA-II检测器在上次迭代运算过程中所输出的信息作为发送符号的先验信息,利用在协作通信的第一阶段从信源节点所接收的数据y/来进行信号检测。 Information [0068] Step (2a) PDA_I the detector PDA-II detector during the last iteration output as a priori information transmitted symbol, using the received from the source node in a first stage of cooperative communication data y / signal detection is performed. 当对发送符号Xk进行检测时,可将接收信号y/表示成 When detecting transmission symbols Xk, the reception signal may be y / represented as

[0070] [0070]

Figure CN101834649BD00094

[0072] 上式中 [0072] In the above formula

Figure CN101834649BD00101

+砘表示检测xk时的干扰量和信道噪声。 + Dun represents the amount of interference and channel noise detection xk. 用多维高斯分布函数逼近可得到 Approximation can be obtained using a multi-dimensional Gaussian distribution function

Figure CN101834649BD00102

μ 口1与Ω,,/可被相应表示成 port 1 and μ Ω ,, / can be expressed as a corresponding

[0073] [0073]

Figure CN101834649BD00103

[0077] 需注意的是此时由于PDA-I检测器将PDA-II检测器在上次迭代运算过程中所输出的信息作为发送符号的先验信息,即可以利用PDA-II检测器所输出的信息来对上两式中的Elxj来进行估值,而不是根据PDA-I检测器自身在上次迭代运算过程所输出的信息,即有 [0077] It is noted that the information at this time because the PDA-I detector PDA-II detector during the last iteration of the transmission symbol outputted as a priori information that may be utilized PDA-II detector output information to the information of the two formulas Elxj to value, and not from the output during the last iteration procedure according to PDA-I detector, that is

Figure CN101834649BD00104

[0079] 相应当前迭代运算过程中PDA-I检测器的输出结果可被表示成 [0079] The corresponding output of the current iteration process PDA-I detector may be expressed as

Figure CN101834649BD00105

[0082] 步骤(2b)PDA-II检测器将PDA-I检测器在本次迭代运算过程中所输出的信息作为发送符号的先验信息,利用在协作通信的第二阶段从转发节点所接收的信息yDn来进行信号检测。 [0082] Information Step (2b) PDA-II detector will detector PDA-I present in the iterative computation process output as a priori information of the transmitted symbols, received from the forwarding node using the second stage of cooperative communication yDn information signal detection is performed. 我们假定转发节点对发送数据的检测完全正确U = x),同样当对发送符号Xk进行检测时,可将接收信号yDn表示成 We assume that the transmission data forwarding node detection was correct U = x), also when the transmission symbols Xk detected, the received signal may be expressed as yDn

[0083] [0083]

Figure CN101834649BD00106

[0087]上式中 [0087] In the above formula

Figure CN101834649BD00107

Ύ表示检测Xk时的干扰量和信道噪声。 Ύ represents the amount of interference and channel noise detection Xk. 用多维 Multidimensional

高斯分布函数逼近〜/可得到 Gaussian distribution function approximating ~ / available

Figure CN101834649BD00108

Dn可被相应表示成 Dn can be expressed as the corresponding

[ [

Figure CN101834649BD00109
Figure CN101834649BD00111

[0092] 同样需注意的是我们利用当前迭代运算过程中PDA-I检测器所输出结果iter来对上两式中的E{Xj}来进行估值,而不是根据PDA-II检测器自身在上次迭代运算过程所输出的信息,即有 [0092] Also to be noted is that we use during the current iteration PDA-I iter result output from the detector to the two to value the formula E {Xj}, rather than PDA-II detector itself information last iteration process output, that is

Figure CN101834649BD00112

[0094] 相应当前迭代运算过程中PDA-II检测器的输出结果可被表示成 [0094] The corresponding output of the current iteration process PDA-II detector may be expressed as

Figure CN101834649BD00113

[0097] 步骤(2c)当迭代运算次数没有超过给定的最大迭代运算次数时,转至步骤(2a); [0097] Step (2c) when the number of the iteration does not exceed a given maximum number of iterations calculation, go to step (. 2A);

[0098] 步骤(2d)当迭代运算次数超过最大迭代运算次数时,根据PDA-I检测器和PDA-II检测器输出的软信息对发送符号进行硬判决,即有 [0098] Step (2d) when the number of iterations exceeds a maximum number of iterations arithmetic operation, based on the soft information of PDA-I PDA-II detector and the detector output of the hard decision transmitted symbols, that is

Figure CN101834649BD00114

[0100] 对本发明方法已经进行了实施试验,我们取Ns = Ne = Nd = 4, cSD = O. 8, cSE = O. 9和cKD = 0.95。 [0100] The method of the present invention has been implemented tests, we take Ns = Ne = Nd = 4, cSD = O. 8, cSE = O. 9 and cKD = 0.95. 假定信源节点端和转发节点端具有相等的发射信号功率,即有Ps = PK。 Assumed that the source node and the forwarding node terminal ends have equal transmit signal power, that is Ps = PK. 图5给出了阈值Ytl= 10. 5时的系统性能示意图。 Figure 5 shows a schematic view of a system performance when the threshold value 10.5 Ytl =. 由该图可以看出本发明所提出的检测算法较Batu 等学者在“ IEEE Commun. Lett. , 2009,13 (5) :330-332” 上发表文章“Performanceanalysis of linear receivers in a MIMO relaying system” 中所提出的解相关检测算法可取得较明显的性能增益,在迭代运算次数为3且误码率为10_4时可取得12dB的性能增益。 This can be seen by the detection algorithm proposed by the present invention, other than Batu scholars "IEEE Commun Lett, 2009,13 (5):.. 330-332" published an article on "Performanceanalysis of linear receivers in a MIMO relaying system" decorrelation detection algorithm may be proposed to obtain a more significant performance gain, and a 3 bit error rate performance can be obtained when the gain of 12dB 10_4 operation of iterations. PDA检测算法的性能能够随迭代运算次数的增加而得到提高,但迭代运算次数从2增加到3时,性能增加不够显著,原因是随着迭代运算次数的增加,PDA检测器所输出的软信息和所输入的软信息间的相关性也越来越强。 PDA detection algorithm performance can be increased with the iteration number is increased, but the number of iterations from 2 to 3 operation, not significantly increase performance, because with the increase in the number of iteration, the soft information output by the PDA detector the correlation between the soft and the information entered is getting stronger.

[0101] 图6给出了不同阈值Y C1时本发明方法的系统性能。 [0101] FIG. 6 shows the performance of different methods of the present invention, the threshold value Y C1. 由该图可看出,当信噪比较小时,^ = 0.5可取得较好的系统性能;而当信噪比较大时,h = 10. 5可取得较好的系统性能。 As can be seen from this figure, when the SNR is small, ^ = 0.5 can obtain better system performance; and when the SNR is large, h = 10. 5 can achieve good system performance. 阈值Y ο较大时,转发节点所转发数据的检测可靠度相应较高,从而能够较好的抑制接收节点端“错误传播”现象;但另一方面转发节点处于激活状态的概率相应降低,即接收节点端获得协作增益的可能性相应降低。 Y ο larger threshold, forwarding node forwarding the data detection reliability correspondingly high, thereby better suppressing the receiving node side "error propagation" phenomena; but on the other node forwarding probability corresponding decrease in the active state, i.e., the possibility of obtaining an end node receiving a corresponding reduction cooperation gain. 当信噪比较小时,转发节点端输出的软信息绝对值相应较小,因此需相应选择较小的阈值5)能够使转发节点具有一定的保持激活状态的概率;当信噪比较大时,转发节点端输出的软信息绝对值相应增大,阈值Ytl较小时,接收节点端“错误传播”现象比较严重,阈值Y ο较大时,转发节点处于激活状态的概率较小,因此必须选择恰当的阈值Y C1 (不能太大也不能太小)来平衡抑制“错误传播”现象和接收节点端尽可能获得转发节点所提供的协作通信增益这两面需求。 When the SNR is small, the absolute value of the soft information corresponding to the output end of the forwarding node is small, and therefore the need to select a smaller threshold value corresponding to 5) enables the forwarding nodes having a certain probability can remain active; when a large SNR , the absolute value of the soft information forward end of the output node increases correspondingly, small Ytl threshold, the receiving end node "error propagation" phenomenon is more serious, the threshold value Y ο large, low probability forwarding node in an active state, and therefore must be selected an appropriate threshold value Y C1 (not too big or too small) balance to inhibit "error propagation" phenomena and the receiving node side gain obtained cooperative communication provided by the forwarding node as possible for the two surfaces.

Claims (6)

1. 一种用于多天线协作通信系统中的随机数据联合检测方法,其特征在于考虑一个两阶段协作通信系统,系统包括一个信源节点,一个转发节点和一个接收节点,并且所有节点均安装有多根天线,利用多天线技术所提供的空间复用增益,为抑制干扰量,分别在转发节点端和基站端使用随机数据联合PDA检测器来进行信号检测,转发节点利用PDA检测器所提供的信息来决定是否转发其所检测的信息;当转发节点对所检测的信息进行转发时,可以在接收节点端使用两个级联的PDA检测器来进行迭代检测,本系统分为转发节点端和接收节点端两个部分:第一,转发节点端包括下列操作步骤: 1. I)利用PDA检测器对所接收的数据进行信号检测,在协作通信的第一阶段,转发节点接收到来自信源节点所发送的数据,假设转发节点端知道信源节点与转发节点间的MIMO信道 A joint detection method for a multi-antenna random data for cooperative communication system, wherein a two-stage consider a cooperative communication system, the system comprising a source node, a forwarding node and a receiving node, and all nodes are installed multiple antennas, multiple antenna techniques using spatial multiplexing gain provided for suppressing the interference amount, respectively, using random data combined PDA detector forwarding node and the base station side to side for signal detection, the forwarding node using a PDA detector provided information to decide whether to forward information it detected; when forwarding node forwards the detected information can be used two cascaded PDA detector at the receiving end to perform iterative detection node, the system node into the forwarding end and a receiving side node of two parts: a first, forward end node comprising the following steps: 1. I) of the received data signal is detected using a PDA detector, cooperative communication in a first stage, the forwarding node receives incoming confidence data sent by the source node, the forwarding node side is assumed to know the MIMO channel between the source node and the forwarding node 信息,可利用PDA检测器对所接收的数据进行信号检测; 1.2)决定转发策略,PDA检测器输出被检测数据的检测可靠度信息,预先给定一个阈值,当PDA检测器输出的所有检测数据的检测可靠度均大于所给定的阈值时,转发节点在协作通信的第二阶段便将所检测的数据转发至接收节点端;否则,转发节点在协作通信的第二阶段对所检测的信息不进行转发; 第二,假设接收节点端知道信源节点与接收节点间的MIMO信道信息,以及转发节点与接收节点间的MIMO信道信息,接收节点端将包括下列操作步骤: 2. I)当转发节点在协作通信的第二阶段没有被激活时,接收节点只能接收到来自信源节点所发送的信息,PDA检测器将根据该信息来进行信号检测, 2. 2)当转发节点在协作通信的第二阶段被激活时,接收节点不仅在协作通信的第一阶段接收到信源节点所发送的信息 Information, the received data is a signal detected using a PDA detector; 1.2) determines a forwarding policy, PDA detector outputting reliability information detected detection data, predetermined a threshold value, if all the detection data PDA detector output when the detection reliability greater than a given threshold, forwarding node in the second phase of the detected cooperative communication put forward data to the receiving node side; otherwise, the node forwarding the information detected in the second stage of cooperative communication not forwarded; second, assuming the receiving node side to know the MIMO channel information between the MIMO channel information between the source node and the receiving node, and forwarding node and the receiving node, the receiving node side will include the following steps: 2. I) when when forwarding node is not activated in the second stage cooperative communication, the receiving node can receive incoming information sent from the source node confidence, PDA detector will be based on the information signal detection, 2.2) when in a cooperative forwarding node when the second phase of the communication is activated, the receiving node receives not only the information signal transmitted by the source node in the first stage of cooperative communication 而且在协作通信的第二阶段接收到转发节点所转发的信息,此时迭代检测器结构由两个级联的PDA检测器组成,可利用该迭代检测器来进行信号检测; 所述的利用两个级联的PDA检测器来进行信号检测包括以下操作步骤: 2. 2a) PDA-I检测器将PDA-II检测器所输出的信息作为发送符号的先验信息,利用接收节点端在协作通信的第一阶段从信源节点所接收的信息来进行信号检测,并且输出软信息; 2. 2b) PDA-II检测器将PDA-I检测器所输出的信息作为发送符号的先验信息,利用接收节点端在协作通信的第二阶段从转发节点所接收的信息来进行信号检测,并且输出软信息; 2. 2c)当系统没有达到所给定的最大迭代运算次数时,转至步骤2. 2a); 2. 2d)当系统达到最大迭代运算次数时,根据PDA-I检测器和PDA-II检测器输出的软信息对发送符号进行硬判决。 And in the second stage receiving the cooperative communication node to forward the information forwarded by the iterator detector structure consists of two cascaded composition PDA detector may be utilized for the iterative detector to detect a signal; the use of two cascaded PDA detector is used to detect a signal comprising the steps: 2. 2a) PDA-I detector PDA-II information of the detector output as a priori information about the transmitted symbols, using the cooperative communication node receiving end first phase information signal received from the source node performs signal detection, and outputs soft information; 2. 2b) PDA-II information detector PDA-I detector output as a priori information transmission symbol by the receiving node side at the second stage of cooperative communication node to forward the information received from the detection signal, and outputs soft information; 2. 2c) when a given maximum number of iterations has not reached computing system, go to step 2. 2a); 2. 2d) when the system reaches the maximum number of iterations calculation, based on the soft information of PDA-I PDA-II detector and the detector output of the hard decision transmitted symbols.
2.根据权利要求I所述的用于多天线协作通信系统中的随机数据联合检测方法,其特征在于利用多天线技术所提供的空间复用增益,即信源节点的每根发射天线均发送不同的数据,转发节点的每根发射天线也均发送不同的数据。 The joint detection method for a multi-antenna random data cooperative communication system according to claim I, wherein the multi-antenna technique using spatial multiplexing gain provided, i.e., each transmit antenna transmits both the source node different data, each transmit antenna transmits a forwarding node can have different data.
3.根据权利要求I所述的用于多天线协作通信系统中的随机数据联合检测方法,其特征在于考虑一个两阶段协作通信系统,在协作通信的第一阶段,信源节点发送数据至转发节点和接收节点端;在协作通信的第二阶段,如果转发节点处于激活状态,其将所检测的信息转发至接收节点端。 The joint detection method for a multi-antenna random data cooperative communication system according to claim I, characterized in that the consideration of a two-stage system cooperative communication, in the first stage of cooperative communication, the source node transmits data to the Forwarding end nodes and receiving nodes; cooperative communication in a second stage, if the information of the forwarding node is active, which forwards the detected side to the receiving node.
4.根据权利要求I所述的用于多天线协作通信系统中的随机数据联合检测方法,其特征在于系统包括一个信源节点,一个转发节点和一个接收节点,该检测方法可被推广至有多个转发节点的多天线协作通信系统中,此时转发节点的转发策略同权利要求I中的步骤I. 2)。 I according to claim joint detection method for a multi-antenna random data cooperative communication system of claim, characterized in that the system includes a source node, a forwarding node and a receiving node, the detection method may be extended to have cooperative multi-antenna communication system of the plurality of forwarding nodes, in which case the forwarding node forwarding the same step I as claimed in claim I. 2).
5.根据权利要求I所述的用于多天线协作通信系统中的随机数据联合检测方法,其特征在于分别在转发节点端和基站端使用PDA检测器来进行信号检测,该方法同样适用于码分多址协作通信系统,在两阶段CDMA协作通信系统中,同样可考虑在转发节点端和接收节点端使用PDA检测器来抑制多址干扰,从而可以提高系统性能。 The detection method as claimed in claim I in combination a multi-antenna random data in the cooperative communication system for, respectively, wherein the PDA detector forwarding node and the base station side to side for signal detection, the method is equally applicable to the code cooperative division multiple access communication system, a two-stage cooperative CDMA communication system, is also conceivable to use the PDA detector and the receiver node in the forwarding node side to suppress multiple access interference, thus improving system performance.
6.根据权利要求I所述的用于多天线协作通信系统中的随机数据联合检测方法,其特征在于步骤2. 2)所述迭代检测器结构由两个级联的PDA检测器组成,该结构可以被推广至用任何两个软输入软输出检测器级联组成迭代检测器,用两个最大后验概率检测器级联,或用一个PDA检测器和一个最大后验概率MAP检测器级联。 The detection method as claimed in claim I in combination cooperative multi-antenna random data communication system according to, characterized in that step 2.2) the iterative detector structure consists of two cascaded PDA detector composition, the structure may be generalized to any two input soft output detector detector cascaded iterative cascade with two maximum a posteriori detector, or with a PDA detector and a maximum a posteriori MAP detector stage Union.
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