CN102487315B

CN102487315B - Multi-source multi-relay cooperation communication method, communication equipment and cooperation communication system

Info

Publication number: CN102487315B
Application number: CN201010573396.0A
Authority: CN
Inventors: 周小林; 杨彦东; 张成磊; 金莹; 魏岳军
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2010-12-03
Filing date: 2010-12-03
Publication date: 2014-09-03
Anticipated expiration: 2030-12-03
Also published as: CN102487315A

Abstract

Embodiments of the present invention provide a multi-source multi-relay cooperative communication method, communication equipment and a cooperative communication system. The multi-source multi-relay cooperative communication method includes: the communication equipment receives a modulated signal sent by the source user equipment in the first time slot; the communication The device receives the modulated signal sent by the source user equipment and the modulated signal sent by the relay user equipment in the second time slot; the modulated signal sent by the relay user equipment is obtained by the relay user equipment from the source user The device recovers the information bit sequence of the source user equipment from the modulated signal sent in the first time slot, performs network coding according to the recovered information bit sequence, and modulates the data obtained after network coding to obtain a modulated signal; the communication device uses The modulated signal received in the first time slot and the modulated signal received in the second time slot are used to obtain the information bit sequence of the modulated signal sent by the source user equipment before modulation. Using the technical solution provided by the invention can save data transmission time.

Description

Multi-source multi-relay cooperative communication method, communication device and cooperative communication system

技术领域 technical field

本发明涉及通信技术领域，特别涉及一种多源多中继协作通信方法、通信设备及协作通信系统。The present invention relates to the technical field of communication, in particular to a multi-source multi-relay cooperative communication method, communication equipment and a cooperative communication system.

背景技术 Background technique

在无线网络中，用户协作中继传输是提供空间分集增益的有效技术，其能够提高系统吞吐量，增强传输性能以及扩大网络覆盖范围。In wireless networks, user cooperative relay transmission is an effective technique to provide space diversity gain, which can improve system throughput, enhance transmission performance and expand network coverage.

传统的中继协作通信技术，总共需要4个时隙。在第一个时隙，源用户A发送数据给中继用户和基站。在第二个时隙，中继用户将接收的源用户A的数据包转发给基站。采用类似的方法，在第三个时隙，源用户B发送数据给中继用户和基站。在第四个时隙，中继用户将接收的源用户B的数据转发给基站。The traditional relay cooperative communication technology needs 4 time slots in total. In the first time slot, the source user A sends data to the relay user and the base station. In the second time slot, the relay user forwards the received data packet of source user A to the base station. Using a similar method, in the third time slot, the source user B sends data to the relay user and the base station. In the fourth time slot, the relay user forwards the received data of the source user B to the base station.

网络编码改变了传统中继协作通信中的信息处理方式，网络编码提出的初衷是为了使多播传输达到理论上的最大传输容量，从而能够获得比传统路由方式更好的网络吞吐量。随着研究的深入，网络编码在均衡网络负载，提升带宽利用率，提高网络链接的鲁棒性，减小网络管理的开销，节省传输能耗，增加传输的安全性等方面也有很大的优势，而且网络编码可以解决传统无线技术无法解决的问题，很大程度上提高无线网络传输性能，如改善无线传输吞吐量和能量利用效率、保证无线链路的可靠传输和安全性等。Network coding has changed the information processing method in traditional relay cooperative communication. The original intention of network coding is to make multicast transmission reach the theoretical maximum transmission capacity, so as to obtain better network throughput than traditional routing methods. With the deepening of research, network coding also has great advantages in balancing network load, improving bandwidth utilization, improving the robustness of network links, reducing network management overhead, saving transmission energy consumption, and increasing transmission security. , and network coding can solve problems that cannot be solved by traditional wireless technology, and greatly improve wireless network transmission performance, such as improving wireless transmission throughput and energy utilization efficiency, ensuring reliable transmission and security of wireless links, etc.

无线协作通信也可应用网络编码技术，以获得网络性能的进一步改善。图1示出了一个基于网络编码的正交协作通信模型。如图1所示，在第一个时隙(如图1中细实线所示)，源用户A将自己的数据包b₁发送出去。第二个时隙(如图1中虚线所示)，源用户B将自己的数据包b₂发送出去。在第三个时隙(如图1中粗实线所示)，中继用户C对前两个时隙接收到的数据进行网络编码。例如：异或处理此后，中继用户将异或处理得到的数据包发送给基站D，基站对此3个时隙接收到的信号进行适当处理，可以获得用户协作空间分集增益，并恢复出源用户A和源用户B发送的数据，基于网络编码的正交协作通信可以节省一个时隙。Wireless cooperative communication can also apply network coding technology to obtain further improvement of network performance. Figure 1 shows an orthogonal cooperative communication model based on network coding. As shown in FIG. 1 , in the first time slot (shown by the thin solid line in FIG. 1 ), the source user A sends out its own data packet b ₁ . In the second time slot (as shown by the dotted line in FIG. 1 ), the source user B sends out its own data packet _b2 . In the third time slot (as shown by the thick solid line in FIG. 1 ), relay user C performs network coding on the data received in the first two time slots. For example: XOR processing Afterwards, the relay user sends the data packet obtained by XOR processing to the base station D, and the base station properly processes the signals received in the three time slots to obtain the user cooperative space diversity gain, and recover the source user A and the source user For the data sent by B, the network coding-based orthogonal cooperative communication can save a time slot.

但是，对于多源多中继系统而言，采用上述基于网络编码的正交协作通信方式，仍需要在三个时隙内完成协作通信流程。However, for a multi-source multi-relay system, the above-mentioned orthogonal cooperative communication method based on network coding still needs to complete the cooperative communication process within three time slots.

发明内容 Contents of the invention

本发明实施例提供一种多源多中继协作通信方法、通信设备及网络系统，能够节省数据传输时间。Embodiments of the present invention provide a multi-source and multi-relay cooperative communication method, communication equipment and network system, which can save data transmission time.

有鉴于此，本发明实施例提供：In view of this, embodiments of the present invention provide:

一种多源多中继的协作通信方法，包括：A multi-source multi-relay cooperative communication method, comprising:

通信设备在第一时隙接收源用户设备发送的调制信号；The communication device receives the modulated signal sent by the source user equipment in the first time slot;

通信设备在第二时隙接收所述源用户设备发送的所述调制信号和中继用户设备发送的调制信号；所述中继用户设备发送的调制信号是所述中继用户设备从所述源用户设备在第一时隙发送的调制信号中恢复出源用户设备的信息位序列，根据恢复出的信息位序列进行网络编码，并对网络编码后得到的数据进行调制得到的调制信号；The communication device receives the modulated signal sent by the source user equipment and the modulated signal sent by the relay user equipment in the second time slot; the modulated signal sent by the relay user equipment is obtained by the relay user equipment from the source recovering the information bit sequence of the source user equipment from the modulated signal sent by the user equipment in the first time slot, performing network coding according to the recovered information bit sequence, and modulating the data obtained after network coding to obtain a modulated signal;

通信设备利用在第一时隙接收的调制信号和在第二时隙接收的调制信号，获取所述源用户设备发送的调制信号在调制前的信息位序列。The communication device uses the modulated signal received in the first time slot and the modulated signal received in the second time slot to obtain the information bit sequence of the modulated signal sent by the source user equipment before modulation.

一种通信设备，包括：A communication device comprising:

数据接收单元，用于在第一时隙接收源用户设备发送的调制信号，在第二时隙接收所述源用户设备发送的所述调制信号和中继用户设备发送的调制信号；所述中继用户设备发送的调制信号是所述中继用户设备从所述源用户设备在第一时隙发送的调制信号中恢复出源用户设备的信息位序列，根据恢复出的信息位序列进行网络编码，并对网络编码后得到的数据进行调制得到的调制信号；A data receiving unit, configured to receive the modulated signal sent by the source user equipment in the first time slot, and receive the modulated signal sent by the source user equipment and the modulated signal sent by the relay user equipment in the second time slot; The modulated signal sent by the relay user equipment is the information bit sequence of the source user equipment recovered by the relay user equipment from the modulated signal sent by the source user equipment in the first time slot, and the network coding is performed according to the recovered information bit sequence , and modulate the data obtained after network coding to obtain a modulated signal;

解码单元，用于利用接收单元在第一时隙接收的调制信号和在第二时隙接收的调制信号，获取所述源用户设备发送的调制信号在调制前的信息位序列。The decoding unit is configured to use the modulated signal received by the receiving unit in the first time slot and the modulated signal received in the second time slot to obtain the information bit sequence of the modulated signal sent by the source user equipment before modulation.

一种协作通信系统，包括：上述通信设备、源用户设备和多个中继用户设备，其中，A cooperative communication system, comprising: the above-mentioned communication device, a source user equipment, and multiple relay user equipments, wherein,

所述源用户设备，用于在第一时隙发送调制信号，在第二时隙发送所述调制信号；The source user equipment is configured to send a modulated signal in a first time slot, and send the modulated signal in a second time slot;

所述中继用户设备，用于从源用户设备在第一时隙发送的调制信号中恢复出源用户设备的信息位序列，利用恢复出的信息位序列进行网络编码，并对网络编码后得到的数据进行调制，在第二时隙发送调制得到的调制信号。The relay user equipment is configured to recover the information bit sequence of the source user equipment from the modulated signal sent by the source user equipment in the first time slot, use the recovered information bit sequence to perform network coding, and obtain after network coding The modulated data is modulated, and the modulated modulated signal is sent in the second time slot.

本发明实施例通信设备在第一时隙接收源用户设备发送的调制信号，在第二时隙接收所述源用户设备发送的所述调制信号和中继用户设备发送的调制信号，利用两个时隙接收的调制信号就可以获取源用户设备调制前的信息位序列，节省了数据传输时间。In the embodiment of the present invention, the communication device receives the modulated signal sent by the source user equipment in the first time slot, receives the modulated signal sent by the source user equipment and the modulated signal sent by the relay user equipment in the second time slot, and utilizes two The modulated signal received by the time slot can obtain the information bit sequence of the source user equipment before modulation, which saves data transmission time.

附图说明 Description of drawings

为了更清楚地说明本发明实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

图1是现有技术提供的多源多中继协作通信方法流程图；Fig. 1 is a flowchart of a multi-source multi-relay cooperative communication method provided by the prior art;

图2是本发明实施例提供的一种多源多中继协作通信方法流程图；FIG. 2 is a flow chart of a multi-source multi-relay cooperative communication method provided by an embodiment of the present invention;

图3是本发明实施例提供的另一种多源多中继协作通信方法流程图；Fig. 3 is a flow chart of another multi-source multi-relay cooperative communication method provided by an embodiment of the present invention;

图4是本发明实施例提供的多源多中继协作通信时解码方法流程图；Fig. 4 is a flowchart of a decoding method during multi-source multi-relay cooperative communication provided by an embodiment of the present invention;

图5是本发明实施例提供的多源多中继协作通信时基站解码示意图；Fig. 5 is a schematic diagram of base station decoding during multi-source multi-relay cooperative communication provided by an embodiment of the present invention;

图6是本发明实施例提供的一种自适应多源多中继协作通信方法流程图；FIG. 6 is a flowchart of an adaptive multi-source multi-relay cooperative communication method provided by an embodiment of the present invention;

图7是本发明实施例提供的网络编码协作通信机制与非协作机制的BER性能比较示意图；Fig. 7 is a schematic diagram of BER performance comparison between the network coding cooperative communication mechanism and the non-cooperative mechanism provided by the embodiment of the present invention;

图8是本发明实施例提供的基于不同源用户设备数目的网络编码协作通信机制的性能示意图；Fig. 8 is a schematic diagram of the performance of the network coding cooperative communication mechanism based on the number of different source user equipments provided by the embodiment of the present invention;

图9是本发明实施例提供的自适应多源多用户传输方法对网络编码协作通信机制的性能影响示意图；Fig. 9 is a schematic diagram of the performance impact of the adaptive multi-source multi-user transmission method provided by the embodiment of the present invention on the network coding cooperative communication mechanism;

图10是本发明实施例提供的通信设备结构示意图；FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of the present invention;

图11是本发明实施例提供的解码单元结构示意图。Fig. 11 is a schematic structural diagram of a decoding unit provided by an embodiment of the present invention.

具体实施方式 Detailed ways

参阅图2，本发明实施例提供一种多源多中继的协作通信方法，其包括：Referring to Figure 2, an embodiment of the present invention provides a multi-source multi-relay cooperative communication method, which includes:

201、通信设备在第一时隙接收源用户设备发送的调制信号。201. The communications device receives a modulated signal sent by a source user equipment in a first time slot.

202、通信设备在第二时隙接收所述源用户设备发送的所述调制信号和中继用户设备发送的调制信号；所述中继用户设备发送的调制信号是中继用户设备从源用户设备在第一时隙发送的调制信号中恢复出源用户设备的信息位序列，利用恢复出的信息位序列进行网络编码，并对网络编码后得到的数据进行调制得到的调制信号。202. The communication device receives the modulated signal sent by the source user equipment and the modulated signal sent by the relay user equipment in the second time slot; the modulated signal sent by the relay user equipment is obtained from the source user equipment by the relay user equipment The modulated signal obtained by recovering the information bit sequence of the source user equipment from the modulated signal sent in the first time slot, performing network coding by using the recovered information bit sequence, and modulating the data obtained after network coding.

203、通信设备利用在第一时隙接收的调制信号和在第二时隙接收的调制信号，获取所述源用户设备发送的调制信号调制前的信息位序列。其中，所获取的源用户设备发送的调制信号调制前的信息位序列是源用户需要向外发送的原始数据。203. The communication device acquires an information bit sequence before modulation of the modulated signal sent by the source user equipment by using the modulated signal received in the first time slot and the modulated signal received in the second time slot. Wherein, the acquired information bit sequence before modulation of the modulated signal sent by the source user equipment is the original data that the source user needs to send out.

其中，本实施例中的通信设备可以是基站。Wherein, the communication device in this embodiment may be a base station.

如果考虑到无线信道对源用户设备、中继用户设备发送的调制信号的影响，则在步骤201中通信设备在第一时隙接收来自源用户设备的第一畸变信号；在第二时隙接收来自所述源用户设备的第二畸变信号和来自所述中继用户设备的畸变信号；其中，第一畸变信号、第二畸变信号是所述源用户设备分别在第一时隙、第二时隙发送的同一调制信号在传输过程中发生畸变后的信号；来自所述中继用户设备的畸变信号是所述中继用户设备在第二时隙发送的调制信号在传输过程中发生畸变后的信号，步骤203中通信设备利用在第一时隙接收的畸变信号和在第二时隙接收的畸变信号，获取所述源用户设备发送的调制信号在调制前的信息位序列。If the influence of the wireless channel on the modulated signal sent by the source user equipment and the relay user equipment is considered, then in step 201, the communication device receives the first distorted signal from the source user equipment in the first time slot; receives the first distorted signal in the second time slot The second distorted signal from the source user equipment and the distorted signal from the relay user equipment; wherein, the first distorted signal and the second distorted signal are obtained by the source user equipment in the first time slot and the second time slot, respectively. The same modulated signal transmitted in the second time slot is distorted during the transmission process; the distorted signal from the relay user equipment is the modulated signal transmitted by the relay user equipment in the second time slot after the distortion occurs in the transmission process signal. In step 203, the communication device uses the distorted signal received in the first time slot and the distorted signal received in the second time slot to obtain the information bit sequence of the modulated signal sent by the source user equipment before modulation.

其中，步骤203具体包括如下步骤：Wherein, step 203 specifically includes the following steps:

A、通信设备利用外部对数似然比值计算公式，利用在第一时隙接收的调制信号，获得第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号；利用在第二时隙接收的调制信号，获得第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号和第二时隙协作所述第i个源用户设备通信的多个中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号；A. The communication device uses the external log-likelihood ratio calculation formula and uses the modulated signal received in the first time slot to obtain the external log-likelihood ratio deinterleaving corresponding to the modulated signal sent by the i-th source user equipment in the first time slot using the modulated signal received in the second time slot to obtain the external logarithmic likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the second time slot. The deinterleaved signal and the second time slot coordinated A signal after the deinterleaving of the external log likelihood ratio corresponding to the modulated signal sent by the plurality of relay user equipments communicating with the i-th source user equipment;

B、通信设备利用第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号和第二时隙协作所述第i个源用户设备通信的多个中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行网络译码，获得第一网络译码结果；利用第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号和第二时隙协作所述第i个源用户设备通信的多个中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行网络译码，获得第二网络译码结果。B. The communication device uses the external logarithm likelihood ratio deinterleaved signal corresponding to the modulated signal sent by the i-th source user equipment in the first time slot and the second time slot to cooperate with the i-th source user equipment to communicate. The modulated signal sent by the relay user equipment corresponds to the deinterleaved signal of the external log-likelihood ratio and performs network decoding to obtain the first network decoding result; the modulated signal sent by the i-th source user equipment in the second time slot corresponds to The deinterleaved signal of the external log-likelihood ratio and the modulated signal sent by the multiple relay user equipments in cooperation with the i-th source user equipment in the second time slot correspond to the external log-likelihood ratio de-interleaved The signal is subjected to network decoding to obtain a second network decoding result.

获得第一网络译码结果的方式如下：The way to obtain the decoding result of the first network is as follows:

获取协作所述第i个源用户设备通信的各中继用户设备对第i个源用户设备的第一类贡献的和；其中，第一时隙中协作第i个源用户设备通信的中继用户设备对第i个源用户设备的第一类贡献利用如下公式获得：Acquiring the sum of the first type contributions of each relay user equipment that cooperates with the i-th source user equipment to communicate with the i-th source user equipment; wherein, in the first time slot, the relay that cooperates with the i-th source user equipment The first type of contribution of the user equipment to the i-th source user equipment is obtained using the following formula:

$log log \frac{P P (({c c}_{i i}^{j j} = = 11 / / {r r}_{11}^{' ' SD SD},, {r r}_{22}^{' ' RD RD}))}{P P (({c c}_{i i}^{j j} = = 00 / / {r r}_{11}^{' ' SD SD},, {r r}_{22}^{' ' RD RD}))}$

其中，为第j个中继用户设备对恢复出的第i个源用户设备的信息位序列进行前向纠错编码所得到信号；表示在第一时隙通信设备接收的源用户设备发送的调制信号第二时隙通信设备接收的中继用户设备发送的调制信号的条件下，等于1的概率；表示在第一时隙通信设备接收的源用户设备发送的调制信号第二时隙通信设备接收的中继用户设备发送的调制信号的条件下，等于0的概率。in, is the signal obtained by performing forward error correction coding on the recovered information bit sequence of the i-th source user equipment by the j-th relay user equipment; Indicates the modulated signal sent by the source user equipment received by the communication device in the first time slot The modulated signal sent by the relay user equipment received by the communication device in the second time slot Under conditions, the probability of being equal to 1; Indicates the modulated signal sent by the source user equipment received by the communication device in the first time slot The modulated signal sent by the relay user equipment received by the communication device in the second time slot Under conditions, is equal to 0 probability.

如果考虑到无线信道对源用户设备、中继用户设备发送的调制信号的影响，基站接收的是来自源用户设备、中继用户设备的畸变信号的情况下，则第一时隙中协作第i个源用户设备通信的中继用户设备对第i个源用户设备的第一类贡献可以表示为：其中，表示在第一时隙通信设备接收的来自源用户设备的畸变信号第二时隙通信设备接收的来自中继用户设备的畸变信号的条件下，等于1的概率；表示在第一时隙通信设备接收的来自源用户设备的畸变信号第二时隙通信设备接收的来自中继用户设备的畸变信号的条件下，等于0的概率；需要说明的是：等于等于 If the influence of the wireless channel on the modulated signal sent by the source user equipment and the relay user equipment is considered, and the base station receives distorted signals from the source user equipment and the relay user equipment, then in the first time slot, the coordinated i-th The first type of contribution of the relay user equipment communicating with the source user equipment to the i-th source user equipment can be expressed as: in, Indicates the distorted signal received by the communication device from the source user equipment in the first time slot The distorted signal from the relay user equipment received by the communication device in the second time slot Under conditions, the probability of being equal to 1; Indicates the distorted signal received by the communication device from the source user equipment in the first time slot The distorted signal from the relay user equipment received by the communication device in the second time slot Under conditions, Equal to the probability of 0; what needs to be explained is: equal equal

获得第二网络译码结果的方式如下：The way to obtain the decoding result of the second network is as follows:

获取协作所述第i个源用户设备通信的各中继用户设备对第i个源用户设备的第二类贡献的和；其中，第二时隙中协作第i个源用户设备通信的中继用户设备对第i个源用户设备的第二类贡献利用如下公式获得：Acquiring the sum of the second type contributions of each relay user equipment that cooperates with the i-th source user equipment to communicate with the i-th source user equipment; wherein, in the second time slot, the relay that cooperates with the i-th source user equipment The second type of contribution of the user equipment to the i-th source user equipment is obtained using the following formula:

$log log \frac{P P (({c c}_{i i}^{j j} = = 11 / / {r r}_{22}^{' ' SD SD},, {r r}_{22}^{' ' RD RD}))}{P P (({c c}_{i i}^{j j} = = 00 / / {r r}_{22}^{' ' SD SD},, {r r}_{22}^{' ' RD RD}))}$

其中，为第j个中继用户设备对恢复出的第i个源用户设备的信息位序列进行前向纠错编码所得到信号；表示在第二时隙通信设备接收的源用户设备发送的调制信号第二时隙通信设备接收的中继用户设备发送的调制信号的条件下，等于1的概率；表示在第二时隙通信设备接收的源用户设备发送的调制信号第二时隙通信设备接收的中继用户设备发送的调制信号的条件下，等于0的概率。in, is the signal obtained by performing forward error correction coding on the recovered information bit sequence of the i-th source user equipment by the j-th relay user equipment; Represents the modulated signal sent by the source user equipment received by the communication device in the second time slot The modulated signal sent by the relay user equipment received by the communication device in the second time slot Under conditions, the probability of being equal to 1; Represents the modulated signal sent by the source user equipment received by the communication device in the second time slot The modulated signal sent by the relay user equipment received by the communication device in the second time slot Under conditions, is equal to 0 probability.

如果考虑到无线信道对源用户设备、中继用户设备发送的调制信号的影响，基站接收的是来自源用户设备、中继用户设备的畸变信号的情况下，则第二时隙中协作第i个源用户设备通信的中继用户设备对第i个源用户设备的第二类贡献可以表示为：其中，表示在第二时隙通信设备接收的来自源用户设备的畸变信号第二时隙通信设备接收的来自中继用户设备的畸变信号的条件下，等于1的概率；表示在第二时隙通信设备接收的来自源用户设备的畸变信号第二时隙通信设备接收的来自中继用户设备的畸变信号的条件下，等于0的概率。其中，等于等于 If considering the influence of the wireless channel on the modulated signals sent by the source user equipment and the relay user equipment, and the base station receives distorted signals from the source user equipment and the relay user equipment, then the i-th coordinated in the second time slot The second type of contribution of the relay user equipment communicating with the source user equipment to the i-th source user equipment can be expressed as: in, Indicates the distorted signal received by the communication device from the source user equipment in the second time slot The distorted signal from the relay user equipment received by the communication device in the second time slot Under conditions, the probability of being equal to 1; Indicates the distorted signal received by the communication device from the source user equipment in the second time slot The distorted signal from the relay user equipment received by the communication device in the second time slot Under conditions, is equal to 0 probability. in, equal equal

C、通信设备计算第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号、第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号、第一网络译码结果、第二网络译码结果的和，对所述和进行信道译码，得到第一信道译码结果。C. The communication device calculates the outer logarithmic likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the first time slot, and the outer log-likelihood ratio corresponding to the modulated signal sent by the ith source user equipment in the second time slot. The sum of the log-likelihood ratio deinterleaved signal, the decoding result of the first network, and the decoding result of the second network is channel-decoded on the sum to obtain the first channel decoding result.

D、通信设备将第一信道译码结果与第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后信号的差值进行交织，得到第一交织结果，将第一交织结果代入第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值计算公式中；将第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行译码，得到第二信道译码结果；将第二信道译码结果与第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号的差值进行交织，得到第二交织结果，并将第二交织结果代入第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值计算公式中；将第二时隙协作所述第i个源用户设备通信的中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行信道译码，得到第三信道译码结果，将第三信道译码结果与第二时隙所述中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号的差值进行交织，得到第三交织结果，将第三交织结果代入第二时隙中继用户设备发送的调制信号对应的外部对数似然比值计算公式中，返回顺序执行步骤A、B、C，直到满足迭代终止条件为止。其中，满足迭代终止条件可以是达到预定的迭代次数，也可以是第i个源用户设备发送的调制信号对应的外部对数似然比值计算公式计算的值趋向收敛。D. The communication device interleaves the difference between the first channel decoding result and the external log likelihood ratio deinterleaved signal corresponding to the modulated signal sent by the i-th source user equipment in the first time slot, to obtain the first interleaving result, Substituting the first interleaving result into the external logarithmic likelihood ratio calculation formula corresponding to the modulated signal sent by the ith source user equipment in the first time slot; Decoding the log-likelihood ratio deinterleaved signal to obtain a second channel decoding result; the second channel decoding result and the outer logarithm corresponding to the modulated signal sent by the i-th source user equipment in the second time slot Interleave the difference between the ratio-deinterleaved signals to obtain a second interleaving result, and substitute the second interleaving result into the external log-likelihood ratio calculation formula corresponding to the modulated signal sent by the i-th source user equipment in the second time slot In: performing channel decoding on the signal after deinterleaving the external logarithmic likelihood ratio corresponding to the modulated signal sent by the relay user equipment communicating with the i-th source user equipment in cooperation with the second time slot, to obtain the third channel decoding As a result, the difference between the third channel decoding result and the deinterleaved signal of the outer log likelihood ratio corresponding to the modulated signal sent by the relay user equipment in the second time slot is interleaved to obtain a third interleaving result, which is The third interleaving result is substituted into the external log-likelihood ratio calculation formula corresponding to the modulated signal sent by the relay user equipment in the second time slot, and steps A, B, and C are executed sequentially until the iteration termination condition is met. Wherein, satisfying the iteration termination condition may mean reaching a predetermined number of iterations, or it may mean that the value calculated by the external log-likelihood ratio calculation formula corresponding to the modulated signal sent by the i-th source user equipment tends to converge.

本发明实施例通信设备在第一时隙接收源用户设备发送的调制信号，在第二时隙接收所述源用户设备发送的所述调制信号和中继用户设备发送的调制信号，利用两个时隙接收的信号就可以获取源用户设备调制前的信息位序列，节省了数据传输时间。In the embodiment of the present invention, the communication device receives the modulated signal sent by the source user equipment in the first time slot, receives the modulated signal sent by the source user equipment and the modulated signal sent by the relay user equipment in the second time slot, and utilizes two The signal received by the time slot can obtain the information bit sequence before modulation of the source user equipment, which saves data transmission time.

为了使本发明提供的技术方案更加清楚，如下实施例对本发明提供的技术方案进行详细描述：In order to make the technical solution provided by the present invention clearer, the following examples describe the technical solution provided by the present invention in detail:

图3示出了本发明实施例提供一种多源多中继协作通信方法，该方法假定协作通信系统包含有N个用户设备，其中：源用户设备集合标记为1≤i≤K。另外，中继用户设备集合标记为1≤j≤(N-K)，每个用户设备使用单天线，该方法具体包括：Fig. 3 shows a multi-source multi-relay cooperative communication method provided by an embodiment of the present invention. The method assumes that the cooperative communication system contains N user equipments, wherein: the set of source user equipments is marked as 1≤i≤K. Additionally, the set of relay user devices is marked as 1≤j≤(NK), each user equipment uses a single antenna, the method specifically includes:

301、在第一时隙，K个源用户设备广播调制信号，中继用户设备恢复出源用户设备广播的调制信号调制前的信息位序列。301. In a first time slot, K source user equipments broadcast modulation signals, and the relay user equipment recovers an information bit sequence before modulation of the modulation signals broadcast by the source user equipments.

具体的，K个源用户设备对信息位序列进行编码，得到序列其中，L_d为信息位序列的帧长，L_c为编码得到的序列的帧长，具体的，可以利用前向纠错(Forward Error Correction，FEC)编码技术进行编码，也可以利用Turbo码进行编码。然后利用交织器、调制器对编码得到的序列进行交织、调制处理，得到调制信号，广播调制信号。Specifically, K source user equipment pairs of information bit sequences Encode to get the sequence Wherein, L _d is the frame length of the information bit sequence, and L _c is the frame length of the sequence obtained by encoding. Specifically, it can be encoded by using forward error correction (Forward Error Correction, FEC) coding technology, or it can be performed by using Turbo code coding. Then use the interleaver and modulator to interleave and modulate the coded sequence to obtain a modulated signal and broadcast the modulated signal.

中继用户设备接收到K个源用户设备广播的调制信号，使用交织多址接入(interleave-division multiple-access，IDMA)迭代多用户检测方法，恢复出源用户设备发送的调制信号调制之前的信息位序列，记为其中，1≤j≤(N-K)，1≤i≤K。The relay user equipment receives the modulated signals broadcast by the K source user equipments, uses an interleaved multiple access (interleave-division multiple-access, IDMA) iterative multi-user detection method, and recovers the modulated signal sent by the source user equipment before modulation information bit sequence, denoted as Among them, 1≤j≤(NK), 1≤i≤K.

由于调制信号是K个源用户设备以广播方式发送的，所以基站会接收到该调制信号对应的第一畸变信号，该步骤中基站接收的第一畸变信号是源用户设备在第一时隙广播的调制信号在传输过程中发生畸变后的信号。具体的，基站接收到的信号为1≤l≤L_s，L_S是一帧的符号长度，是基站处产生的加性高斯白噪声(AWGN)，其均值为0，方差为表示第i个源用户设备和基站之间的块衰落信道，为第一时隙第i个源用户设备广播的调制信号，为第一畸变信号。Since the modulated signal is broadcast by K source user equipment, the base station will receive the first distorted signal corresponding to the modulated signal. In this step, the first distorted signal received by the base station is broadcast by the source user equipment in the first time slot The modulated signal is a signal that is distorted during transmission. Specifically, the signal received by the base station is 1≤l≤L _s , L _S is the symbol length of a frame, is the additive white Gaussian noise (AWGN) generated at the base station, with a mean of 0 and a variance of Denotes the block fading channel between the i-th source user equipment and the base station, is the modulated signal broadcast by the i-th source user equipment in the first time slot, is the first distortion signal.

302、在第二时隙，源用户设备再次广播调制信号，中继用户设备使用线性网络编码对恢复出的源用户设备的信息位序列进行编码、交织、调制处理，广播调制处理后的调制信号。302. In the second time slot, the source user equipment broadcasts the modulated signal again, and the relay user equipment uses linear network coding to encode, interleave, and modulate the recovered information bit sequence of the source user equipment, and broadcast the modulated signal .

在该时隙内，中继用户设备将恢复出的源用户设备的信息位序列进行编码，得到序列然后使用线性网络编码，对已编码位进行异或操作，其中，1≤j≤(N-K)，如果令其中，A_j为第j个中继用户设备选定进行网络编码的源用户设备的集合，其中，中继用户设备可以选择特定的源用户设备进行网络编码，具体可以选择全部源用户设备，也可以是部分源用户设备。N-K个中继用户设备对异或操作结果进行交织、调制处理，然后广播调制信号。In this time slot, the relay user equipment encodes the recovered information bit sequence of the source user equipment to obtain the sequence Then using linear network coding, XORing the encoded bits, Among them, 1≤j≤(NK), if make Wherein, A _j is the set of source user equipment selected by the jth relay user equipment for network coding, wherein the relay user equipment can select a specific source user equipment for network coding, specifically, all source user equipment can be selected, or May be part of the source user equipment. The NK relay user equipments perform interleaving and modulation processing on the XOR operation result, and then broadcast the modulated signal.

在第二时隙内，源用户设备再次广播自己的调制信号，此时隙中，基站接收到来自源用户设备的第二畸变信号和来自中继用设备的畸变信号，其中，来自源用户设备的第二畸变信号是源用户设备在第二时隙发送的调制信号在传输过程中发生畸变后的信号，来自中继用设备的畸变信号是中继用户设备在第二时隙发送的调制信号在传输过程中发生畸变后的信号，具体的，该时隙中基站接收的信号，其表示为：其中，为第i个源用户设备在第二时隙广播的调制信号，为第i个源用户设备与基站之间的块衰落信道，为第二畸变信号；为第j个中继用户设备在第二时隙广播的调制信号，为第j个中继用户设备和基站间的平坦块衰落信道，为来自中继用户设备的畸变信号；为基站所产生的加性白高斯噪声，其平均值为0，方差为 In the second time slot, the source user equipment broadcasts its own modulated signal again. In this time slot, the base station receives the second distorted signal from the source user equipment and the distorted signal from the relay device, wherein the second distorted signal from the source user equipment The second distorted signal is the signal after the modulated signal sent by the source user equipment in the second time slot is distorted during transmission, and the distorted signal from the relay device is the modulated signal sent by the relay user equipment in the second time slot The distorted signal in the transmission process, specifically, the signal received by the base station in this time slot is expressed as: in, is the modulated signal broadcast by the i-th source user equipment in the second time slot, is the block fading channel between the i-th source user equipment and the base station, is the second distortion signal; is the modulated signal broadcast by the jth relay user equipment in the second time slot, is the flat block fading channel between the jth relay user equipment and the base station, is the distorted signal from the relay user equipment; is the additive white Gaussian noise generated by the base station, with an average value of 0 and a variance of

303、基站根据第一时隙接收的信号和第二时隙接收的信号，获得源用户设备调制前的信息位序列。303. The base station obtains the information bit sequence of the source user equipment before modulation according to the signal received in the first time slot and the signal received in the second time slot.

如图4所示，该步骤303具体包括：As shown in Figure 4, this step 303 specifically includes:

401、基站中利用码片级高斯分布近似的软多用户检测算法，利用第一时隙接收的信号，获得第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值对第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值进行解交织，得到解交织后的信号 401. Using the chip-level Gaussian distribution approximation soft multi-user detection algorithm in the base station, using the signal received in the first time slot, to obtain the external log likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the first time slot Deinterleave the external log likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the first time slot to obtain the deinterleaved signal

具体的，根据如下公式(1)，通过使用码片级高斯分布近似的软多用户检测算法，利用如下外部对数似然比值计算公式，得到第一个时隙第i个源用户设备发送的调制信号对应的外部对数似然比值。Specifically, according to the following formula (1), by using the soft multi-user detection algorithm approximated by the chip-level Gaussian distribution, and using the following external logarithmic likelihood ratio calculation formula, the i-th source user equipment sent by the first time slot is obtained Modulated signal The corresponding external log-likelihood ratio values.

${e e}_{MUD MUD} (({x x}_{i i}^{S S})) = = \frac{{22 h h}_{i i}^{SD SD}}{\underset{{i i}^{' '} &NotEqual; &NotEqual; i i}{Σ Σ} {| | {h h}_{{i i}^{' '}}^{SD SD} | |}^{22} Var Var (({x x}_{{i i}^{' '}}^{S S})) + + {σ σ}_{11}^{22}} (({r r}_{11}^{SD SD} - - \underset{{i i}^{' '} &NotEqual; &NotEqual; i i}{Σ Σ} E E. (({x x}_{{i i}^{' '}}^{S S})))),,$ $&ForAll; &ForAll; i i,, - - - - - - ((11))$

其中，是第一信道译码单元反馈的的一个后验信息，Var(·)和E(·)分别表示求方差和均值。其中，其中，表示任意一个 in, is fed back by the first channel decoding unit A posteriori information of , Var(·) and E(·) represent variance and mean respectively. in, in, means any

其中，利用码片级高斯分布近似的软多用户检测算法，获得第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值是由基站中的第一多用户检测MUD单元获得的，对第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值进行解交织操作是由基站中的第一解交织单元执行的。Among them, using the soft multi-user detection algorithm approximated by the chip-level Gaussian distribution, the external logarithmic likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the first time slot is obtained by the first multi-user detection MUD in the base station The first deinterleaving unit in the base station performs the deinterleaving operation on the outer logarithmic likelihood ratio value corresponding to the modulated signal sent by the i-th source user equipment in the first time slot obtained by the unit.

402、基站中利用码片级高斯分布近似的软多用户检测算法，利用第二时隙接收的信号，获得第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值对第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值进行解交织，得到解交织后的信号 402. Using a soft multiuser detection algorithm approximated by chip-level Gaussian distribution in the base station, using the signal received in the second time slot, to obtain the external log likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the second time slot Deinterleaving the external log likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the second time slot to obtain a deinterleaved signal

采用与步骤401相似的方式，获得第二个时隙第i个源用户设备发送的调制信号对应的外部对数似然比值。In a manner similar to step 401, obtain the modulated signal sent by the i-th source user equipment in the second time slot The corresponding external log-likelihood ratio values.

基站中利用码片级高斯分布近似的软多用户检测算法，获得第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值是由基站中的第二多用户检测MUD单元执行的，对第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值进行解交织的操作是由基站中的第二解交织单元执行的。Using the soft multi-user detection algorithm approximated by the chip-level Gaussian distribution in the base station, the external logarithmic likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the second time slot is obtained by the second multi-user detection MUD in the base station The unit performs deinterleaving on the outer log likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the second time slot is performed by the second deinterleaving unit in the base station.

403、基站中利用码片级高斯分布近似的软多用户检测算法，利用第二时隙接收的信号，获得第二时隙协作第i个源用户设备通信的中继用户设备发送的调制信号对应的外部对数似然比值对中继用户设备发送的调制信号对应的外部对数似然比值进行解交织，分别得到解交织后的信号 403. Using the chip-level Gaussian distribution approximation soft multi-user detection algorithm in the base station, using the signal received in the second time slot, to obtain the correspondence of the modulated signal sent by the relay user equipment that communicates with the i-th source user equipment in cooperation with the second time slot The external log-likelihood ratio of Deinterleave the external log likelihood ratio corresponding to the modulated signal sent by the relay user equipment, and obtain the deinterleaved signal respectively

采用与步骤401相似的方式，获得第二个时隙内接收的的外部对数似然比值解交织后的信号。In a manner similar to step 401, obtain the received data in the second time slot The outer log-likelihood ratio of the deinterleaved signal.

基站中利用码片级高斯分布近似的软多用户检测算法，获得第二时隙协作第i个源用户设备通信的中继用户设备发送的调制信号对应的外部对数似然比值是由基站中的第三多用户检测MUD单元执行的，对中继用户设备发送的调制信号对应的外部对数似然比值进行解交织操作是有第三解交织单元执行的。In the base station, the soft multi-user detection algorithm approximated by the chip-level Gaussian distribution is used to obtain the external logarithmic likelihood ratio corresponding to the modulated signal sent by the relay user equipment communicating with the i-th source user equipment in the second time slot. The third multi-user detection MUD unit performs the deinterleaving operation on the external log likelihood ratio corresponding to the modulated signal sent by the relay user equipment, which is performed by the third deinterleaving unit.

需要说明的是，步骤401-403没有时序上的先后顺序，可以同时执行。It should be noted that steps 401-403 are not sequential in sequence and may be executed simultaneously.

404、利用第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号和第二时隙协作所述第i个源用户设备通信的中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行网络译码，得到第一网络译码结果 404. Deinterleave the signal by using the external log-likelihood ratio value corresponding to the modulated signal sent by the i-th source user equipment in the first time slot A deinterleaved signal corresponding to the outer log-likelihood ratio value corresponding to the modulated signal sent by the relay user equipment communicating with the i-th source user equipment in cooperation with the second time slot Perform network decoding to obtain the first network decoding result

该步骤的网络译码操作具体可以由第一网络编码译码单元执行的。The network decoding operation in this step may specifically be performed by the first network coding and decoding unit.

具体的，根据如下公式(2)，得到第j个中继用户设备对第i个源用户设备的第一贡献的值；Specifically, according to the following formula (2), the first contribution of the j-th relay user equipment to the i-th source user equipment is obtained value;

${L L}_{MUD MUD}^{S S} (({c c}_{i i}^{j j})) = = log log \frac{P P (({c c}_{i i}^{j j} = = 11 / / R R))}{P P (({c c}_{i i}^{j j} = = 00 / / R R))} = = log log \frac{α α + + exp exp (({L L}_{MUD MUD} (({c c}_{j j}^{R R}))))}{11 + + α α * * exp exp (({L L}_{MUD MUD} (({c c}_{j j}^{R R}))))},,$ $&ForAll; &ForAll; i i,, j j,, - - - - - - ((22))$

其中，为第j个中继用户设备对恢复出的第i个源用户设备的信息位序列进行编码所得到信号；表示在第一时隙基站接收的来自源用户设备的第一畸变信号第二时隙基站接收的来自中继用户设备的畸变信号的条件下，等于1的概率；表示在第一时隙基站接收的来自源用户设备的第一畸变信号第二时隙基站接收的来自中继用户设备的畸变信号的条件下，等于0的概率；in, A signal obtained by encoding the recovered information bit sequence of the i-th source user equipment for the j-th relay user equipment; represents the first distorted signal received by the base station from the source user equipment in the first time slot The distorted signal from the relay user equipment received by the base station in the second time slot Under conditions, the probability of being equal to 1; represents the first distorted signal received by the base station from the source user equipment in the first time slot The distorted signal from the relay user equipment received by the base station in the second time slot Under conditions, is equal to the probability of 0;

其中，in,

$α α = = \frac{\underset{l l &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq l l \leq \leq K K}{Σ Σ}} exp exp (({L L}_{MUD MUD} (({c c}_{l l}^{S S})))) + + . . . . . . + + \underset{{l l}_{11} &NotEqual; &NotEqual; i i,, {l l}_{22} &NotEqual; &NotEqual; i i,, . . . . . .,, {l l}_{K K - - 11} &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq {l l}_{11} \leq \leq . . . . . . \leq \leq {l l}_{K K - - 11} \leq \leq K K}{Σ Σ}} exp exp (({Σ Σ}_{m m = = 11}^{K K - - 11} {L L}_{MUD MUD} (({c c}_{{l l}_{m m}}^{S S}))))}{11 + + \underset{{l l}_{11} &NotEqual; &NotEqual; i i,, {l l}_{22} &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq {l l}_{11} \leq \leq {l l}_{22} \leq \leq K K}{Σ Σ}} exp exp (({Σ Σ}_{m m = = 11}^{22} {L L}_{MID MID} (({c c}_{{l l}_{m m}}^{S S})))) + + . . . . . . + + \underset{{l l}_{11} &NotEqual; &NotEqual; i i,, {l l}_{22} &NotEqual; &NotEqual; i i,, . . . . . .,, {l l}_{K K - - 22} &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq {l l}_{11} \leq \leq . . . . . . \leq \leq {l l}_{K K - - 22} \leq \leq K K}{Σ Σ}} exp exp (({Σ Σ}_{m m = = 11}^{K K - - 22} {L L}_{MUD MUD} (({c c}_{{l l}_{m m}}^{S S}))))},,$

如下是对公式(2)的推导过程：The following is the derivation process of formula (2):

${L L}_{MUD MUD}^{S S} (({c c}_{i i}^{j j})) = = log log \frac{P P (({c c}_{i i}^{j j} = = 11 / / R R))}{P P (({c c}_{i i}^{j j} = = 00 / / R R))}$

$= = log log \frac{P P (({c c}_{j j}^{R R} &CirclePlus; &CirclePlus; (({c c}_{11}^{S S} &CirclePlus; &CirclePlus; {c c}_{22}^{S S} &CirclePlus; &CirclePlus; . . . . . . &CirclePlus; &CirclePlus; {c c}_{i i - - 11}^{S S} &CirclePlus; &CirclePlus; {c c}_{i i + + 11}^{S S} &CirclePlus; &CirclePlus; . . . . . . &CirclePlus; &CirclePlus; {c c}_{K K}^{S S})) = = 11 / / {r r}_{11}^{SD SD},, {r r}_{22}^{RD RD}))}{P P (({c c}_{j j}^{R R} &CirclePlus; &CirclePlus; (({c c}_{11}^{S S} &CirclePlus; &CirclePlus; {c c}_{22}^{S S} &CirclePlus; &CirclePlus; . . . . . . &CirclePlus; &CirclePlus; {c c}_{i i - - 11}^{S S} &CirclePlus; &CirclePlus; {c c}_{i i + + 11}^{S S} &CirclePlus; &CirclePlus; . . . . . . &CirclePlus; &CirclePlus; {c c}_{K K}^{S S})) = = 00 / / {r r}_{11}^{SD SD},, {r r}_{22}^{RD RD}))}$

$= = log log \frac{P P (({c c}_{j j}^{R R} = = 00 / / {r r}_{22}^{RD RD})) ζ ζ + + P P (({c c}_{j j}^{R R} = = 11 / / {r r}_{22}^{RD RD})) ((11 - - ζ ζ))}{P P (({c c}_{j j}^{R R} = = 00 / / {r r}_{22}^{RD RD})) ((11 - - ζ ζ)) + + P P (({c c}_{j j}^{R R} = = 11 / / {r r}_{22}^{RD RD})) ζ ζ}$

$= = log log \frac{α α + + exp exp (({L L}_{MUD MUD} (({c c}_{j j}^{R R}))))}{11 + + α α * * exp exp (({L L}_{MUD MUD} (({c c}_{j j}^{R R}))))},,$

其中， $ζ = P (\frac{1 - {(- 1)}^{c_{1}^{S} + c_{2}^{S} + . . . + c_{i - 1}^{S} + c_{i + 1}^{S} + . . . + c_{K}^{S}}}{2} = 1 / r_{1}^{SD})$ in, $ζ = P (\frac{1 - {(- 1)}^{c_{1}^{S} + c_{2}^{S} + . . . + c_{i - 1}^{S} + c_{i + 1}^{S} + . . . + c_{K}^{S}}}{2} = 1 / r_{1}^{SD})$

$α α = = \frac{ζ ζ}{11 - - ζ ζ}$

$= = \frac{P P ((\frac{11 - - {((- - 11))}^{{c c}_{11}^{S S} + + {c c}_{22}^{S S} + + . . . . . . + + {c c}_{i i - - 11}^{S S} + + {c c}_{i i + + 11}^{S S} + + . . . . . . + + {c c}_{K K}^{S S}}}{22} = = 11 / / {r r}_{11}^{SD SD}))}{P P ((\frac{11 - - {((- - 11))}^{{c c}_{11}^{S S} + + {c c}_{22}^{S S} + + . . . . . . + + {c c}_{i i - - 11}^{S S} + + {c c}_{i i + + 11}^{S S} + + . . . . . . + + {c c}_{K K}^{S S}}}{22} = = 00 / / {r r}_{11}^{SD SD}))}$

$= = \frac{\underset{l l &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq l l \leq \leq K K}{Σ Σ}} {A A}_{l l} + + \underset{{l l}_{11} &NotEqual; &NotEqual; i i,, {l l}_{22} &NotEqual; &NotEqual; i i,, {l l}_{33} &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq {l l}_{11} \leq \leq {l l}_{22} \leq \leq {l l}_{33} \leq \leq K K}{Σ Σ}} {A A}_{{l l}_{11}} {A A}_{{l l}_{22}} {A A}_{{l l}_{33}} + + . . . . . . + + \underset{{l l}_{11} &NotEqual; &NotEqual; i i,, {l l}_{22} &NotEqual; &NotEqual; i i,, . . . . . .,, {l l}_{K K - - 11} &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq {l l}_{11} \leq \leq . . . . . . \leq \leq {l l}_{K K - - 11} \leq \leq K K}{Σ Σ}} {A A}_{{l l}_{11}} {A A}_{{l l}_{22}} . . . . . . {A A}_{{l l}_{K K - - 11}}}{11 + + \underset{{l l}_{11} &NotEqual; &NotEqual; i i,, {l l}_{22} &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq {l l}_{11} \leq \leq {l l}_{22} \leq \leq K K}{Σ Σ}} {A A}_{{l l}_{11}} {A A}_{{l l}_{22}} + + . . . . . . + + \underset{{l l}_{11} &NotEqual; &NotEqual; i i,, {l l}_{22} &NotEqual; &NotEqual; i i,, . . . . . .,, {l l}_{K K - - 22} &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq {l l}_{11} \leq \leq . . . . . . \leq \leq {l l}_{K K - - 22} \leq \leq K K}{Σ Σ}} {A A}_{{l l}_{11}} {A A}_{{l l}_{22}} . . . . . . {A A}_{{l l}_{K K - - 22}}}$

$= = \frac{\underset{l l &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq l l \leq \leq K K}{Σ Σ}} exp exp (({L L}_{MUD MUD} (({c c}_{l l}^{S S})))) + + . . . . . . + + \underset{{l l}_{11} &NotEqual; &NotEqual; i i,, {l l}_{22} &NotEqual; &NotEqual; i i,, . . . . . .,, {l l}_{K K - - 11} &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq {l l}_{11} \leq \leq . . . . . . \leq \leq {l l}_{K K - - 11} \leq \leq K K}{Σ Σ}} exp exp (({Σ Σ}_{m m = = 11}^{K K - - 11} {L L}_{MUD MUD} (({c c}_{{l l}_{m m}}^{S S}))))}{11 + + . . . . . . + + \underset{{l l}_{11} &NotEqual; &NotEqual; i i,, {l l}_{22} &NotEqual; &NotEqual; i i,, . . . . . .,, {l l}_{K K - - 22} &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq {l l}_{11} \leq \leq . . . . . . \leq \leq {l l}_{K K - - 22} \leq \leq K K}{Σ Σ}} exp exp (({Σ Σ}_{m m = = 11}^{K K - - 22} {L L}_{MUD MUD} (({c c}_{{l l}_{m m}}^{S S}))))},,$

其中，1≤l≤K，l≠i，若 1≤l≤K。in, 1≤l≤K, l≠i, if 1≤l≤K.

405、利用第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号和第二时隙协作所述第i个源用户设备通信的多个中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行网络译码，得到第二网络译码结果 405. Deinterleave the signal by using the external log-likelihood ratio value corresponding to the modulated signal sent by the i-th source user equipment in the second time slot A deinterleaved signal corresponding to the outer log-likelihood ratio value corresponding to the modulated signal sent by the plurality of relay user equipments communicating with the i-th source user equipment in cooperation with the second time slot Perform network decoding to obtain the second network decoding result

该步骤的网络译码操作具体可以由第二网络编码译码单元执行的。The network decoding operation in this step may specifically be performed by the second network coding and decoding unit.

具体的，根据如下公式，得到第j个中继用户设备对第i个源用户设备的第二贡献的值；Specifically, according to the following formula, the second contribution of the j-th relay user equipment to the i-th source user equipment is obtained value;

${L L}_{MUD MUD}^{' ' S S} (({c c}_{i i}^{j j})) = = log log \frac{P P (({c c}_{i i}^{j j} = = 11 / / {r r}_{11}^{RD RD},, {r r}_{22}^{RD RD}))}{P P (({c c}_{i i}^{j j} = = 00 / / {r r}_{11}^{RD RD},, {r r}_{22}^{RD RD}))}$

$= = log log \frac{P P (({c c}_{j j}^{R R} &CirclePlus; &CirclePlus; (({c c}_{11}^{S S} &CirclePlus; &CirclePlus; {c c}_{22}^{S S} &CirclePlus; &CirclePlus; . . . . . . &CirclePlus; &CirclePlus; {c c}_{i i - - 11}^{S S} &CirclePlus; &CirclePlus; {c c}_{i i + + 11}^{S S} &CirclePlus; &CirclePlus; . . . . . . &CirclePlus; &CirclePlus; {c c}_{K K}^{S S})) = = 11 / / {r r}_{11}^{RD RD},, {r r}_{22}^{RD RD}))}{P P (({c c}_{j j}^{R R} &CirclePlus; &CirclePlus; (({c c}_{11}^{S S} &CirclePlus; &CirclePlus; {c c}_{22}^{S S} &CirclePlus; &CirclePlus; . . . . . . &CirclePlus; &CirclePlus; {c c}_{i i - - 11}^{S S} &CirclePlus; &CirclePlus; {c c}_{i i + + 11}^{S S} &CirclePlus; &CirclePlus; . . . . . . &CirclePlus; &CirclePlus; {c c}_{K K}^{S S})) = = 00 / / {r r}_{11}^{RD RD},, {r r}_{22}^{RD RD}))}$

$= = log log \frac{α α + + exp exp (({L L}_{MUD MUD} (({c c}_{j j}^{R R}))))}{11 + + α α * * exp exp (({L L}_{MUD MUD} (({c c}_{j j}^{R R}))))}$

其中，表示在第二时隙基站接收的来自源用户设备的第二畸变信号第二时隙基站接收的来自中继用户设备的畸变信号的条件下，等于1的概率；表示在第二时隙基站接收的来自源用户设备的第二畸变信号第二时隙基站接收的来自中继用户设备的畸变信号的条件下，等于0的概率。in, Indicates the second distorted signal from the source user equipment received by the base station in the second time slot The distorted signal from the relay user equipment received by the base station in the second time slot Under conditions, the probability of being equal to 1; Indicates the second distorted signal from the source user equipment received by the base station in the second time slot The distorted signal from the relay user equipment received by the base station in the second time slot Under conditions, is equal to 0 probability.

$α α = = \frac{ζ ζ}{11 - - ζ ζ}$

$= = \frac{P P ((\frac{11 - - {((- - 11))}^{{c c}_{11}^{S S} + + {c c}_{22}^{S S} + + . . . . . . + + {c c}_{i i - - 11}^{S S} + + {c c}_{i i + + 11}^{S S} + + . . . . . . + + {c c}_{K K}^{S S}}}{22} = = 11 / / {r r}_{22}^{SD SD}))}{P P ((\frac{11 - - {((- - 11))}^{{c c}_{11}^{S S} + + {c c}_{22}^{S S} + + . . . . . . + + {c c}_{i i - - 11}^{S S} + + {c c}_{i i + + 11}^{S S} + + . . . . . . + + {c c}_{K K}^{S S}}}{22} = = 00 / / {r r}_{22}^{SD SD}))}$

$= = \frac{\underset{l l &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq l l \leq \leq K K}{Σ Σ}} exp exp (({L L}_{MUD MUD}^{' '} (({c c}_{l l}^{S S})))) + + . . . . . . + + \underset{{l l}_{11} &NotEqual; &NotEqual; i i,, {l l}_{22} &NotEqual; &NotEqual; i i,, . . . . . .,, {l l}_{K K - - 11} &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq {l l}_{11} \leq \leq . . . . . . \leq \leq {l l}_{K K - - 11} \leq \leq K K}{Σ Σ}} exp exp (({Σ Σ}_{m m = = 11}^{K K - - 11} {L L}_{MUD MUD}^{' '} (({c c}_{{l l}_{m m}}^{S S}))))}{11 + + . . . . . . + + \underset{{l l}_{11} &NotEqual; &NotEqual; i i,, {l l}_{22} &NotEqual; &NotEqual; i i,, . . . . . .,, {l l}_{K K - - 22} &NotEqual; &NotEqual; i i}{\underset{11 \leq \leq {l l}_{11} \leq \leq . . . . . . \leq \leq {l l}_{K K - - 22} \leq \leq K K}{Σ Σ}} exp exp (({Σ Σ}_{m m = = 11}^{K K - - 22} {L L}_{MUD MUD}^{' '} (({c c}_{{l l}_{m m}}^{S S}))))},,$

需要说明的是，步骤404、405没有时序上的先后顺序，可以同时执行。It should be noted that steps 404 and 405 are not sequential in sequence and may be executed simultaneously.

406、基站将第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号、第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号、第一网络译码结果和第二网络译码结果求和，获得第i个源用户设备的外部对数似然比值 406. The base station deinterleaves the outer log likelihood ratio signal corresponding to the modulated signal sent by the i-th source user equipment in the first time slot, and the outer pair corresponding to the modulated signal sent by the i-th source user equipment in the second time slot. Summing the deinterleaved signal, the decoding result of the first network and the decoding result of the second network to obtain the external log-likelihood ratio of the i-th source user equipment

具体的，利用如下公式(3)，得到第i个源用户设备的外部对数似然比值：Specifically, the following formula (3) is used to obtain the external log likelihood ratio of the i-th source user equipment:

${L L}_{MUD MUD}^{NC NC} (({c c}_{i i}^{S S})) = = {L L}_{MUD MUD} (({c c}_{i i}^{S S})) + + {Σ Σ}_{j j = = 11}^{N N - - K K} {L L}_{MUD MUD}^{S S} (({c c}_{i i}^{j j})) + + {L L}^{' '}_{MUD MUD} (({c c}_{i i}^{S S})) + + {Σ Σ}_{j j = = 11}^{N N - - K K} {L L}_{MUD MUD}^{' ' S S} (({c c}_{i i}^{j j})),,$ $&ForAll; &ForAll; i i . . - - - - - - ((33))$

407、基站对第i个源用户设备的外部对数似然比值进行信道译码，得到第一信道译码结果，将第一信道译码结果与第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后信号的差值进行交织，得到第一交织结果将第一交织结果代入第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值计算公式中，直到达到迭代终止条件为止。407. External log-likelihood ratio of the base station to the i-th source user equipment Perform channel decoding to obtain the first channel decoding result, and the difference between the first channel decoding result and the external log-likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the first time slot after deinterleaving Perform interleaving to obtain the first interleaving result will first interleave the result Substitute into the external log-likelihood ratio calculation formula corresponding to the modulated signal sent by the i-th source user equipment in the first time slot, until the iteration termination condition is reached.

该步骤中进行信道译码的操作可以由基站中的第一信道译码单元执行。The channel decoding operation in this step may be performed by the first channel decoding unit in the base station.

408、基站将第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行信道译码，得到第二信道译码结果；将第二信道译码结果与第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号的差值进行交织，得到第二交织结果并将第二交织结果代入第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值计算公式中，直到达到迭代终止条件为止。408. The base station deinterleaves the signal after deinterleaving the external log likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the second time slot Perform channel decoding to obtain a second channel decoding result; deinterleave the second channel decoding result with the outer log likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the second time slot difference Perform interleaving to obtain the second interleaving result And substituting the second interleaving result into the external logarithmic likelihood ratio calculation formula corresponding to the modulated signal sent by the i-th source user equipment in the second time slot, until the iteration termination condition is reached.

该步骤中进行信道译码的操作可以由基站中的第二信道译码单元执行。The channel decoding operation in this step may be performed by the second channel decoding unit in the base station.

409、基站将第二时隙协作所述第i个源用户设备通信的中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行信道译码，得到第三信道译码结果，将第三信道译码结果与第二时隙所述中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号的差值进行交织，得到第三交织结果将第三交织结果代入第二时隙中继用户设备发送的调制信号对应的外部对数似然比值计算公式中，直到达到迭代终止条件为止。409. The base station deinterleaves the signal corresponding to the external log likelihood ratio value corresponding to the modulated signal transmitted by the relay user equipment communicating with the i-th source user equipment in the second time slot Perform channel decoding to obtain a third channel decoding result, and the difference between the third channel decoding result and the deinterleaved signal of the external log likelihood ratio corresponding to the modulated signal sent by the relay user equipment in the second time slot value Perform interleaving to obtain the third interleaving result Substituting the third interleaving result into the external logarithmic likelihood ratio calculation formula corresponding to the modulated signal sent by the relay user equipment in the second time slot, until the iteration termination condition is reached.

需要说明的是，步骤407-409没有时序上的先后顺序，可以同时执行。It should be noted that steps 407-409 are not sequential in sequence and may be executed simultaneously.

该步骤中进行信道译码的操作可以由基站中的第三信道译码单元执行。The channel decoding operation in this step may be performed by a third channel decoding unit in the base station.

本发明实施例中基站在第一时隙接收来自源用户设备的第一畸变信号，在第二时隙接收来自源用户设备的第二畸变信号和来自中继用户设备的畸变信号，其中，第一畸变信号、第二畸变信号是源用户设备分别在第一时隙、第二时隙发送的同一调制信号在传输过程中发生畸变后的信号；来自中继用户设备的畸变信号是中继用户设备在第二时隙发送的调制信号在传输过程中发生畸变后的信号，基站利用两个时隙接收的信号就可以获取源用户设备调制前的信息位序列，节省了数据传输时间；同时多中继协作传输的方式，可以提高系统的灵敏度，获得更高的分集增益；进一步，可以在只有一个中继用户设备的情况下，为多个源用户设备完成中继传输，并获得明显的误码率改善。In the embodiment of the present invention, the base station receives the first distorted signal from the source user equipment in the first time slot, and receives the second distorted signal from the source user equipment and the distorted signal from the relay user equipment in the second time slot, wherein the first The first distorted signal and the second distorted signal are the distorted signals of the same modulated signal transmitted by the source user equipment in the first time slot and the second time slot respectively; the distorted signal from the relay user equipment is the The modulated signal sent by the device in the second time slot is a distorted signal during transmission. The base station can use the signal received by the two time slots to obtain the information bit sequence of the source user equipment before modulation, which saves data transmission time; The way of relay cooperative transmission can improve the sensitivity of the system and obtain higher diversity gain; further, in the case of only one relay user equipment, it can complete relay transmission for multiple source user equipment, and obtain obvious error Bit rate improvement.

由于中继用户设备的增加会增加整个系统的分集增益，并且随着中继用户设备的增加每个中继用户设备所协作的源用户设备的数量也可减少一些，即每个中继用户设备可以只需对M(M＜K)个源用户设备恢复出的信息序列进行网络编码合并；但是，中继用户设备的增加也会使整个系统的吞吐量下降，因此，每个中继用户设备网络编码时所协作的源用户设备数量需要视实际系统情况而定。Since the increase of relay user equipment will increase the diversity gain of the entire system, and with the increase of relay user equipment, the number of source user equipment that each relay user equipment cooperates can also be reduced, that is, each relay user equipment It is only necessary to perform network coding and merging on the information sequences recovered by M (M<K) source user equipments; however, the increase of relay user equipments will also decrease the throughput of the whole system. Therefore, each relay user equipment The number of source user equipments coordinated during network coding depends on the actual system conditions.

另外，一般情况下认为中继用户设备距离源用户设备的距离很近，信道环境较好，中继用户设备对源用户设备广播的调制信号进行解码的误码率低，接收性能较为理想。然而，由于源用户设备的移动性，中继用户设备距离源用户设备的距离可能较远，此时，如果强行对源用户设备广播的调制信号进行解码并进行网络编码的话，系统的性能可能会较差。因此，可以考虑到当中继用户设备无法良好地解码源用户设备广播的调制信号时，在第二时隙则不进行网络编码，而是在第二时隙之后的一个单独的时隙将第一时隙接收到的调制信号直接发送出去。In addition, it is generally believed that the distance between the relay user equipment and the source user equipment is very short, the channel environment is good, the bit error rate of the relay user equipment decoding the modulated signal broadcast by the source user equipment is low, and the receiving performance is relatively ideal. However, due to the mobility of the source user equipment, the relay user equipment may be far away from the source user equipment. At this time, if the modulated signal broadcast by the source user equipment is forcibly decoded and network coded, the performance of the system may decrease. poor. Therefore, it can be considered that when the relay user equipment cannot well decode the modulated signal broadcast by the source user equipment, network coding is not performed in the second time slot, but the first The modulated signal received by the time slot is sent out directly.

基于以上两个方面的考虑，本申请提出一种自适应多源多用户协作传输方法，该方法具体包括：Based on the above two considerations, this application proposes an adaptive multi-source multi-user cooperative transmission method, which specifically includes:

601、在系统初始运营时，选择一个网元作为中继用户设备，并设置该中继用户设备能进行网络编码，则此时能进行网络编码的中继用户设备数目K′＝1；直接转发数据的中继用户设备数目K″＝0。601. During the initial operation of the system, select a network element as the relay user equipment, and set the relay user equipment to be able to perform network coding, then the number of relay user equipment capable of network coding at this time is K′=1; direct forwarding The number of data relay user equipments K″=0.

602、新的中继用户设备判断自己的接收误码率是否小于阈值，如果是，执行603；如果否，执行607。602. The new relay user equipment judges whether its received bit error rate is smaller than the threshold, if yes, execute 603; if no, execute 607.

在系统初始运营时，所选择的一个中继用户设备即为所述新的中继用户设备。其中，接收误码率是指新的中继设备对源用户设备发送的调制信号解码的误码率。During the initial operation of the system, the selected relay user equipment is the new relay user equipment. Wherein, the receiving bit error rate refers to the bit error rate of decoding the modulated signal sent by the source user equipment by the new relay device.

603、新的中继用户设备向基站上报接收误码率，基站根据新的中继用户设备上报的接收误码率和该中继用户设备的位置，确定该新的中继用户设备所协作的源用户设备的个数，向该新的中继用户设备发送指示所述新的中继用户设备所协作的源用户设备的个数的指示信息。603. The new relay user equipment reports the receiving bit error rate to the base station, and the base station determines the location that the new relay user equipment cooperates with according to the receiving bit error rate reported by the new relay user equipment and the location of the relay user equipment The number of source user equipments, sending indication information indicating the number of source user equipments coordinated by the new relay user equipment to the new relay user equipment.

604、新的中继用户设备根据指示其所协作的源用户设备的个数的指示信息，将第一时隙接收的相应个数的源用户设备发送的调制信号进行解码，恢复出信息位序列，并对恢复出的信息位序列进行网络编码、交织、调制处理，在第二时隙发送调制信号，执行607。604. The new relay user equipment decodes the modulated signals sent by the corresponding number of source user equipments received in the first time slot according to the indication information indicating the number of the source user equipments it cooperates with, and recovers the information bit sequence , and perform network coding, interleaving, and modulation processing on the recovered information bit sequence, and send the modulated signal in the second time slot, and go to step 607.

605、新的中继用户设备在第二时隙以后的一个时隙将相应个数的源用户设备发送的调制信号发送给基站。605. The new relay user equipment sends the modulated signals sent by the corresponding number of source user equipments to the base station in a time slot after the second time slot.

606、基站设置K′＝K′-1，K″＝K″+1。606. The base station sets K'=K'-1, K"=K"+1.

607、基站判断K′+K″是否小于或者等于K-1，如果是，执行608，如果否，结束本流程。607. The base station judges whether K'+K" is less than or equal to K-1. If yes, execute 608. If no, end this procedure.

608、基站判断基站的接收误码率是否小于预定的误码率，如果是，执行609，如果否，结束本流程。608. The base station judges whether the receiving bit error rate of the base station is less than a predetermined bit error rate, if yes, execute 609, and if no, end this process.

具体的，基站可以根据解码得到的源用户设备的信息位序列，确定接收误码率。Specifically, the base station may determine the reception bit error rate according to the decoded information bit sequence of the source user equipment.

可选的，该步骤也可以判断系统容量是否达到预定的数值，如果是，执行步骤609，其中，系统容量是指系统每秒每HZ传输的比特数。Optionally, this step may also determine whether the system capacity reaches a predetermined value, and if so, perform step 609, wherein the system capacity refers to the number of bits transmitted by the system per second per HZ.

609、基站通知系统中的非中继节点做为新的中继节点，并设置K′＝K′+1，返回执行步骤602。609. The base station notifies a non-relay node in the system as a new relay node, and sets K'=K'+1, and returns to step 602.

需要说明的是，如果基站不为新的中继用户设备确定其所协作的源用户设备的个数，则每个中继用户设备可以分别为个源用户设备协作通信，即，每个中继用户设备对恢复出的个源用户设备的信息位序列进行网络编码、交织、调制后发送调制信号。经过仿真，当中继用户设备总数量K′+K″等于源用户设备数量K时，即，每个中继用户设备只协作一个源用户设备通信时，误码率(bit error ratio，BER)性能较好。It should be noted that if the base station does not determine the number of source user equipments that it cooperates with for the new relay user equipment, each relay user equipment can be A source user equipment cooperates in communication, that is, each relay user equipment pairs the recovered The information bit sequence of each source user equipment is network coded, interleaved, and modulated, and then the modulated signal is sent. After simulation, when the total number of relay user equipment K'+K" is equal to the number of source user equipment K, that is, when each relay user equipment cooperates with only one source user equipment to communicate, the bit error rate (BER) performance better.

图7示出了网络编码协作通信机制(以4个源用户设备的场景(4SourceUser scenario)为例)与非协作机制的BER性能比较示意图，其假定4个源用户设备和1个中继用户设备，且重复码速率为1/16，其中，图7中的Conventional Non-co IDMA scheme表示传统非协作通信交织多址接入机制；Cooperation Scheme表示协作通信机制，Iteration n表示n次迭代，n＝1，2，3，4。中继用户设备的编码机制为从图7中可以看出，若BER为2.6×10^-3，则在4次迭代后，网络编码协作下的通信机制相对于非协作机制有8dbEb/N0的协作增益(Cooperation Gain)，从图7中还可以看出，在低Eb/N0区域，BER性能的增益可被忽略。因为在这片区域，网络编码器所获得的软信息是很低的。在较高的Eb/N0区域，随着Eb/N0的增加，BER性能有较高的增益，这是因为在这片区域，软信息给予网络解码更精确的值，从而获得明显的分集增益。Figure 7 shows a schematic diagram of the BER performance comparison between the network coding cooperative communication mechanism (taking the scenario of 4 source user equipments (4SourceUser scenario) as an example) and the non-cooperative mechanism, assuming 4 source user equipments and 1 relay user equipment , and the repetition rate is 1/16, where the Conventional Non-co IDMA scheme in Figure 7 represents the traditional non-cooperative communication interleaving multiple access mechanism; the Cooperation Scheme represents the cooperative communication mechanism, and Iteration n represents n iterations, n= 1, 2, 3, 4. The encoding mechanism of the relay user equipment is It can be seen from Figure 7 that if the BER is 2.6×10 ^-3 , then after 4 iterations, the communication mechanism under network coding cooperation has a cooperation gain (Cooperation Gain) of 8dbEb/N0 compared with the non-cooperative mechanism. 7, it can also be seen that in the low Eb/N0 region, the gain in BER performance is negligible. Because in this area, the soft information obtained by the network encoder is very low. In the higher Eb/N0 region, there is a higher gain in BER performance with the increase of Eb/N0, because in this region, soft information gives the network decoding more accurate values, thereby obtaining obvious diversity gain.

图8示出了基于不同源用户设备数目的网络编码协作通信机制(以1个中继用户设备的场景(1Relay User scenario)为例)的性能示意图，图8中的Non-cooperation IDMA scheme(4Source Users)表示4个源用户设备的非协作通信交织多址接入机制；Cooperation Scheme(k Source Users)表示k个源用户设备的协作通信机制。假定源用户设备数目为K＝4，6，8，1个中继用户设备，且重复码速率为1/16，从图8可以看出，随着源用户设备的增加，网络编码协作传输机制的BER性能在下降。因为中继用户设备需要对源用户设备的数据进行异或合并操作：j＝1，…，(N-K)，组合在一起并再次向前传输，组合信号越多，获得的用户协作分集越少，BER越高。Figure 8 shows a performance diagram of a network coding cooperative communication mechanism based on the number of different source user equipments (taking the scenario of 1 relay user equipment (1Relay User scenario) as an example), the Non-cooperation IDMA scheme (4Source Users) represents the non-cooperative communication interleaved multiple access mechanism of 4 source user equipments; Cooperation Scheme (k Source Users) represents the cooperative communication mechanism of k source user equipments. Assuming that the number of source user equipments is K=4, 6, 8, 1 relay user equipment, and the repetition code rate is 1/16, it can be seen from Figure 8 that with the increase of source user equipments, the network coding cooperative transmission mechanism The BER performance is degrading. Because the relay user equipment needs to XOR merge the data of the source user equipment: j=1,...,(NK), combined together and transmitted forward again, the more combined signals, the less user cooperation diversity is obtained, and the higher the BER.

图9示出了自适应多源多用户传输方法对网络编码协作通信机制(以4个源用户设备的场景(4Source User scenario)为例)的性能影响示意图，图9中的Conventional Non-co IDMA scheme表示传统非协作通信交织多址接入机制；Cooperation Scheme表示为协作通信机制，Adaptive CooperationScheme表示自适应协作通信机制；假定源用户设备数目为4，2个中继用户设备，且重复码速率为1/16，网络编码机制为一个中继用户对所有恢复得到的源用户设备的信息位序列进行网络编码传输，其操作为：另一个中继不进行译码，而是在第三个时隙直接将第一个时隙接收到的广播数据转发。从图9可以看出，在提高系统吞吐量的情况下，虽然另一个直接转发的中继用户设备独自多占用了一个时隙，因此，在这种自适应后的中继传输场景中，系统的BER性能仍是有一定的提升，尤其是高信道信噪比的情况下。Figure 9 shows a schematic diagram of the performance impact of the adaptive multi-source multi-user transmission method on the network coding cooperative communication mechanism (taking the scenario of 4 source user equipment (4Source User scenario) as an example), the Conventional Non-co IDMA in Figure 9 Scheme represents the traditional non-cooperative communication interleaving multiple access mechanism; Cooperation Scheme represents the cooperative communication mechanism, and Adaptive CooperationScheme represents the adaptive cooperative communication mechanism; assuming that the number of source user equipment is 4, there are 2 relay user equipment, and the repetition code rate is 1/16, the network coding mechanism is that a relay user performs network coding transmission on all recovered information bit sequences of the source user equipment, and its operation is: The other relay does not perform decoding, but directly forwards the broadcast data received in the first time slot in the third time slot. It can be seen from Fig. 9 that in the case of improving the system throughput, although another relay user equipment directly forwarding occupies one more time slot by itself, therefore, in this adaptive relay transmission scenario, the system There is still a certain improvement in the BER performance, especially in the case of high channel signal-to-noise ratio.

参阅图10，本发明实施例提供一种通信设备，该通信设备可以是基站，其包括：Referring to FIG. 10, an embodiment of the present invention provides a communication device, which may be a base station, which includes:

数据接收单元10，用于在第一时隙接收源用户设备发送的调制信号，在第二时隙接收所述源用户设备发送的所述调制信号和中继用户设备发送的调制信号；所述中继用户设备发送的调制信号是所述中继用户设备从所述源用户设备在第一时隙发送的调制信号中恢复出源用户设备的信息位序列，根据恢复出的信息位序列进行网络编码，并对网络编码后得到的数据进行调制得到的调制信号；The data receiving unit 10 is configured to receive the modulated signal sent by the source user equipment in the first time slot, and receive the modulated signal sent by the source user equipment and the modulated signal sent by the relay user equipment in the second time slot; the The modulated signal sent by the relay user equipment is the information bit sequence of the source user equipment recovered by the relay user equipment from the modulated signal sent by the source user equipment in the first time slot, and the network is performed according to the recovered information bit sequence Coding, and modulating the data obtained after network coding to obtain a modulated signal;

解码单元20，用于利用接收单元在第一时隙接收的调制信号和在第二时隙接收的调制信号，获取所述源用户设备发送的调制信号在调制前的信息位序列。The decoding unit 20 is configured to use the modulated signal received by the receiving unit in the first time slot and the modulated signal received in the second time slot to obtain an information bit sequence of the modulated signal sent by the source user equipment before modulation.

其中，如果考虑到无线信道对源用户设备、中继用户设备发送的调制信号的影响，数据接收单元10，用于在第一时隙接收来自源用户设备的第一畸变信号；在第二时隙接收来自所述源用户设备的第二畸变信号和来自所述中继用户设备的畸变信号；其中，第一畸变信号、第二畸变信号是所述源用户设备分别在第一时隙、第二时隙发送的同一调制信号在传输过程中发生畸变后的信号；来自所述中继用户设备的畸变信号是所述中继用户设备在第二时隙发送的调制信号在传输过程中发生畸变后的信号，其中，所述中继用户设备在第二时隙发送的调制信号是中继用户设备从源用户设备在第一时隙发送的所述调制信号中恢复出源用户设备的信息位序列，利用恢复出的信息位序列进行网络编码，并对网络编码后得到的数据进行调制得到的调制信号；解码单元20用于利用在第一时隙接收的畸变信号和在第二时隙接收的畸变信号，获取所述源用户设备发送的调制信号在调制前的信息位序列。Wherein, if the influence of the wireless channel on the modulated signal sent by the source user equipment and the relay user equipment is considered, the data receiving unit 10 is configured to receive the first distorted signal from the source user equipment in the first time slot; The second distorted signal from the source user equipment and the distorted signal from the relay user equipment are received in a time slot; wherein, the first distorted signal and the second distorted signal are obtained by the source user equipment in the first time slot and the second time slot respectively The same modulated signal transmitted in the second time slot is distorted during transmission; the distorted signal from the relay user equipment is the modulated signal transmitted by the relay user equipment in the second time slot and is distorted during transmission The following signal, wherein the modulated signal sent by the relay user equipment in the second time slot is the information bit of the source user equipment recovered by the relay user equipment from the modulated signal sent by the source user equipment in the first time slot Sequence, using the recovered information bit sequence to perform network coding, and modulate the data obtained after network coding to obtain a modulated signal; the decoding unit 20 is used to use the distorted signal received in the first time slot and receive in the second time slot the distorted signal, and obtain the information bit sequence of the modulated signal sent by the source user equipment before modulation.

其中，解码单元20包括：Wherein, the decoding unit 20 includes:

参阅图11，解码单元20包括：Referring to Figure 11, the decoding unit 20 includes:

多用户检测单元21，用于获得第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值、第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值和第二时隙协作所述第i个源用户设备通信的多个中继用户设备发送的调制信号对应的外部对数似然比值；具体的，多用户检测单元21包括：第一多用户检测单元，用于利用外部对数似然比值计算公式，获得第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值；第二多用户检测单元，用于利用外部对数似然比值计算公式，获得第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值；和第三多用户检测单元，用于外部对数似然比值计算公式，获得第二时隙协作所述第i个源用户设备通信的多个中继用户设备发送的调制信号对应的外部对数似然比值；The multi-user detection unit 21 is configured to obtain the external logarithmic likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the first time slot, and the external logarithmic likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the second time slot The logarithmic likelihood ratio and the external logarithmic likelihood ratio corresponding to the modulated signals sent by the plurality of relay user equipments communicating with the i-th source user equipment in cooperation with the second time slot; specifically, the multi-user detection unit 21 includes: the first A multi-user detection unit is used to use the external log-likelihood ratio calculation formula to obtain the external log-likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the first time slot; the second multi-user detection unit uses Obtaining the external log-likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the second time slot by using the external log-likelihood ratio calculation formula; and the third multi-user detection unit, used for the external log-likelihood The ratio calculation formula is used to obtain the external log likelihood ratio corresponding to the modulated signal sent by the plurality of relay user equipments communicating with the i-th source user equipment in cooperation with the second time slot;

解交织单元22，用于对第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值进行解交织；对第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值进行解交织；对第二时隙所述多个中继用户设备发送的调制信号对应的外部对数似然比值进行解交织；具体的，解交织单元22包括：第一解交织单元，用于对第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值进行解交织；第二解交织单元，用于对第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值进行解交织；和第三解交织单元，用于对第二时隙所述多个中继用户设备发送的调制信号对应的外部对数似然比值进行解交织；The deinterleaving unit 22 is configured to deinterleave the external log likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the first time slot; and correspond to the modulated signal sent by the i-th source user equipment in the second time slot Perform deinterleaving on the external log likelihood ratio values of the external log likelihood ratios; perform deinterleaving on the external log likelihood ratio values corresponding to the modulated signals sent by the plurality of relay user equipments in the second time slot; specifically, the deinterleaving unit 22 includes: A deinterleaving unit, used to deinterleave the external logarithmic likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the first time slot; performing deinterleaving on the outer logarithm likelihood ratio corresponding to the modulated signal sent by the source user equipment; and a third deinterleaving unit, configured to perform deinterleaving on the outer logarithm corresponding to the modulated signal sent by the plurality of relay user equipments in the second time slot Likelihood ratio for deinterleaving;

第一网络编码译码单元23，用于利用第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号和第二时隙协作所述第i个源用户设备通信的多个中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行网络译码，获得第一网络译码结果；The first network coding and decoding unit 23 is configured to use the external logarithmic likelihood ratio deinterleaved signal corresponding to the modulated signal sent by the ith source user equipment in the first time slot and cooperate with the ith in the second time slot Performing network decoding on the signal after the deinterleaved external log-likelihood ratio corresponding to the modulated signal sent by the multiple relay user equipments communicating with the source user equipment, to obtain a first network decoding result;

具体的，第一网络编码译码单元具体用于获取协作所述第i个源用户设备通信的各中继用户设备对第i个源用户设备的第一类贡献的和；其中，第一时隙中协作第i个源用户设备通信的中继用户设备对第i个源用户设备的第一类贡献利用如下公式获得：Specifically, the first network coding and decoding unit is specifically configured to obtain the sum of the first type contributions of each relay user equipment that cooperates with the i-th source user equipment to communicate with the i-th source user equipment; wherein, the first The first type of contribution of the relay user equipment that cooperates with the i-th source user equipment to communicate with the i-th source user equipment in the gap is obtained by the following formula:

第二网络编码译码单元24，用于利用第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号和第二时隙协作所述第i个源用户设备通信的多个中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行网络译码，获得第二网络译码结果；The second network coding and decoding unit 24 is configured to use the external logarithmic likelihood ratio deinterleaved signal corresponding to the modulated signal sent by the i-th source user equipment in the second time slot and cooperate with the i-th in the second time slot performing network decoding on the signal after the deinterleaved external log-likelihood ratio corresponding to the modulated signals sent by the multiple relay user equipments communicating with the source user equipment, to obtain a second network decoding result;

具体的，第二网络编码译码单元具体用于获得第二网络译码结果包括：获取协作所述第i个源用户设备通信的各中继用户设备对第i个源用户设备的第二类贡献的和；其中，第二时隙中协作第i个源用户设备通信的中继用户设备对第i个源用户设备的第二类贡献利用如下公式获得：Specifically, the second network coding and decoding unit is specifically configured to obtain the second network decoding result includes: obtaining the second type of the i-th source user equipment from each relay user equipment that cooperates with the i-th source user equipment to communicate. The sum of contributions; wherein, the second type of contribution of the i-th source user equipment to the i-th source user equipment by the relay user equipment that cooperates in the i-th source user equipment communication in the second time slot is obtained by the following formula:

求和单元25，用于计算第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号、第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号、第一网络译码结果、第二网络译码结果的和；A summation unit 25, configured to calculate the outer logarithmic likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the first time slot, the deinterleaved signal, and the modulated signal sent by the i-th source user equipment in the second time slot The sum of the corresponding external log-likelihood ratio deinterleaved signal, the decoding result of the first network, and the decoding result of the second network;

信道译码单元26，用于对所述求和单元计算的和进行信道译码，得到第一信道译码结果；将第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行信道译码，得到第二信道译码结果；将第二时隙协作所述第i个源用户设备通信的中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行信道译码，得到第三信道译码结果；具体的，信道译码单元包括：第一信道译码单元，用于对所述求和单元计算的和进行信道译码，得到第一信道译码结果；第二信道译码单元，用于将第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行信道译码，得到第二信道译码结果；和第三信道译码单元，用于将第二时隙协作所述第i个源用户设备通信的中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号进行信道译码，得到第三信道译码结果。The channel decoding unit 26 is configured to perform channel decoding on the sum calculated by the summation unit to obtain a first channel decoding result; the external logarithm corresponding to the modulated signal sent by the i-th source user equipment in the second time slot The likelihood ratio deinterleaved signal is subjected to channel decoding to obtain a second channel decoding result; the outer logarithm corresponding to the modulated signal sent by the relay user equipment communicating with the i-th source user equipment in cooperation with the second time slot The signal after the likelihood ratio deinterleaving is subjected to channel decoding to obtain a third channel decoding result; specifically, the channel decoding unit includes: a first channel decoding unit for performing channel decoding on the sum calculated by the summing unit Decoding to obtain the first channel decoding result; the second channel decoding unit is used to channel the signal after deinterleaving the external log-likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the second time slot Decoding, to obtain a second channel decoding result; and a third channel decoding unit, configured to coordinate the outer logarithm of the modulated signal sent by the relay user equipment communicating with the i-th source user equipment in the second time slot The signal after the likelihood ratio deinterleaving is subjected to channel decoding to obtain a third channel decoding result.

交织单元27，用于将第一信道译码结果与第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后信号的差值进行交织，得到第一交织结果；将第二信道译码结果与第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号的差值进行交织，得到第二交织结果；将第三信道译码结果与第二时隙所述中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号的差值进行交织，得到第三交织结果；将第一交织结果、第二交织结果和第三交织结果反馈到所述多用户检测单元，使所述多用户检测单元将所述第一交织结果代入第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值计算公式，将第二交织结果代入第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值计算公式，将第三交织结果代入第二时隙中继用户设备发送的调制信号对应的外部对数似然比值计算公式。具体的，交织单元包括：第一交织单元，用于将第一信道译码结果与第一时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后信号的差值进行交织，得到第一交织结果并反馈到第一多用户检测单元；第二交织单元，用于将第二信道译码结果与第二时隙第i个源用户设备发送的调制信号对应的外部对数似然比值解交织后的信号的差值进行交织，得到第二交织结果并反馈到第二多用户检测单元；和第三交织单元，用于将第三信道译码结果与第二时隙所述中继用户设备发送的调制信号对应的外部对数似然比值解交织后的信号的差值进行交织，得到第三交织结果并反馈到第三多用户检测单元。The interleaving unit 27 is configured to interleave the difference between the first channel decoding result and the outer log-likelihood ratio deinterleaved signal corresponding to the modulated signal sent by the i-th source user equipment in the first time slot, to obtain the first interleaved Result; interleaving the difference between the second channel decoding result and the deinterleaved signal corresponding to the external log-likelihood ratio of the modulated signal sent by the i-th source user equipment in the second time slot, to obtain a second interleaving result; The third channel decoding result is interleaved with the difference between the outer log-likelihood ratio deinterleaved signal corresponding to the modulated signal sent by the relay user equipment in the second time slot to obtain a third interleaving result; the first interleaving The result, the second interleaving result and the third interleaving result are fed back to the multi-user detection unit, so that the multi-user detection unit substitutes the first interleaving result into the modulated signal sent by the ith source user equipment in the first time slot corresponding to The external log-likelihood ratio calculation formula, the second interleaving result is substituted into the external log-likelihood ratio calculation formula corresponding to the modulated signal sent by the i-th source user equipment in the second time slot, and the third interleaving result is substituted into the second time slot The formula for calculating the external log-likelihood ratio corresponding to the modulated signal sent by the slot relay user equipment. Specifically, the interleaving unit includes: a first interleaving unit, configured to take the difference between the first channel decoding result and the outer log-likelihood ratio corresponding to the modulated signal sent by the i-th source user equipment in the first time slot after the deinterleaved signal The value is interleaved to obtain the first interleaving result and feed it back to the first multi-user detection unit; the second interleaving unit is used to correspond to the second channel decoding result and the modulated signal sent by the i-th source user equipment in the second time slot Interleaving the difference of the signal after deinterleaving by the external log-likelihood ratio to obtain a second interleaving result and feeding it back to the second multi-user detection unit; and a third interleaving unit for combining the third channel decoding result with the second Interleave the difference between the outer log-likelihood ratio deinterleaved signal corresponding to the modulated signal sent by the relay user equipment in the time slot to obtain a third interleaving result and feed it back to the third multi-user detection unit.

为了实现自适应多源多中继协作通信机制，该通信设备还包括：In order to realize the adaptive multi-source multi-relay cooperative communication mechanism, the communication device also includes:

判断单元30，用于根据所获取的源用户设备调制前的信息位序列，判断通信设备的接收误码率是否小于预定的误码率，或者，判断系统容量是否达到预定的数值；The judging unit 30 is configured to judge whether the receiving bit error rate of the communication device is less than a predetermined bit error rate according to the acquired information bit sequence of the source user equipment before modulation, or judge whether the system capacity reaches a predetermined value;

信令发送单元40，用于在通信设备的接收误码率小于预定的误码率，或者系统容量达到预定的数值时，向当前系统中非中继用户设备发送指示所述非中继用户设备作为新的中继用户设备的指示信息。The signaling sending unit 40 is configured to send an instruction to the non-relay user equipment in the current system when the receiving bit error rate of the communication device is less than a predetermined bit error rate, or the system capacity reaches a predetermined value. As the indication information of the new relay user equipment.

所述基站还包括：The base station also includes:

信令接收单元50，用于接收所述新的中继用户设备发送的所述新的中继用户设备的接收误码率；A signaling receiving unit 50, configured to receive the reception bit error rate of the new relay user equipment sent by the new relay user equipment;

确定单元60，用于根据所述新的中继用户设备的接收误码率，确定所述中继用户设备所协作的源用户设备的个数；其中，所述新的中继用户设备的接收误码率是在所述新的中继用户设备确定所述自己的接收误码率达到预定要求之后发送的；The determining unit 60 is configured to determine the number of source user equipments that the relay user equipment cooperates with according to the reception bit error rate of the new relay user equipment; wherein, the reception of the new relay user equipment The bit error rate is sent after the new relay user equipment determines that its own receiving bit error rate meets a predetermined requirement;

所述信令发送单元30，还用于向所述新的中继用户设备发送指示所述新的中继用户设备所协作的源用户设备的个数的指示信息。The signaling sending unit 30 is further configured to send indication information indicating the number of source user equipments that the new relay user equipment cooperates with to the new relay user equipment.

本发明实施例的通信设备在第一时隙接收源用户设备发送的调制信号，在第二时隙接收所述源用户设备发送的所述调制信号和中继用户设备发送的调制信号，利用两个时隙接收的信号就可以获取源用户设备调制前的信息位序列，节省了数据传输时间；同时多中继协作传输的方式，可以提高系统的灵敏度，获得更高的分集增益；进一步，可以在只有一个中继用户设备的情况下，为多个源用户设备完成中继传输，并获得明显的误码率改善。The communication device in the embodiment of the present invention receives the modulated signal sent by the source user equipment in the first time slot, and receives the modulated signal sent by the source user equipment and the modulated signal sent by the relay user equipment in the second time slot. The signal received in a time slot can obtain the information bit sequence before modulation of the source user equipment, which saves data transmission time; at the same time, the way of multi-relay cooperative transmission can improve the sensitivity of the system and obtain higher diversity gain; further, it can In the case of only one relay user equipment, the relay transmission is completed for multiple source user equipments, and an obvious bit error rate improvement is obtained.

本发明实施例提供一种网络系统，其包括：上述通信设备、源用户设备和多个中继用户设备，其中，An embodiment of the present invention provides a network system, which includes: the above-mentioned communication device, a source user equipment, and multiple relay user equipments, wherein,

所述中继用户设备，用于从源用户设备在第一时隙发送的调制信号中恢复出源用户设备的信息位序列，利用恢复出的信息位序列进行网络编码，并对编码后数据进行调制，在第二时隙发送调制得到的调制信号。The relay user equipment is configured to recover the information bit sequence of the source user equipment from the modulated signal sent by the source user equipment in the first time slot, use the recovered information bit sequence to perform network coding, and perform network coding on the coded data modulation, sending the modulated modulated signal in the second time slot.

为了实现自适应多源多用户通信机制，所述通信设备还用于根据所获取的源用户设备调制前的信息位序列，判断基站的接收性能是否达到预置条件，如果是，向当前系统中非中继用户设备发送指示所述非中继用户设备作为新的中继用户设备的指示信息；In order to realize the self-adaptive multi-source multi-user communication mechanism, the communication device is further configured to judge whether the receiving performance of the base station meets the preset condition according to the acquired information bit sequence before modulation of the source user equipment, and if so, report to the current system The non-relay user equipment sends indication information indicating that the non-relay user equipment is used as a new relay user equipment;

所述新的中继用户设备，用于判断自己的接收误码率是否达到阈值，如果是，则从源用户设备在第一时隙发送的调制信号中恢复出源用户设备的信息位序列，利用恢复出的信息位序列进行网络编码，并对编码后数据进行调制，在第二时隙发送调制得到的调制信号；如果否，将源用户设备在第一时隙发送的调制信号中在第三时隙转发给基站。其中，第三时隙是在第二时隙之后的一个单独的时隙。The new relay user equipment is used to judge whether its receiving bit error rate reaches a threshold, and if so, restore the information bit sequence of the source user equipment from the modulated signal sent by the source user equipment in the first time slot, Use the recovered information bit sequence to perform network coding, and modulate the coded data, and send the modulated modulated signal in the second time slot; if not, use the modulated signal sent by the source user equipment in the first time slot in the first time slot Three timeslots are forwarded to the base station. Wherein, the third time slot is a separate time slot after the second time slot.

本发明实施例的通信设备在第一时隙接收源用户设备发送的调制信号，在第二时隙接收所述源用户设备发送的所述调制信号和中继用户设备发送的调制信号，利用两个时隙接收的信号就可以获取源用户设备调制前的信息位序列，节省了数据传输时间；同时多中继协作传输的方式，可以提高系统的灵敏度，获得更高的分集增益；进一步，可以在只有一个中继用户设备的情况下，为多个源用户设备完成中继传输，并获得明显的误码率改善。The communication device in the embodiment of the present invention receives the modulated signal sent by the source user equipment in the first time slot, and receives the modulated signal sent by the source user equipment and the modulated signal sent by the relay user equipment in the second time slot. The signal received in a time slot can obtain the information bit sequence of the source user equipment before modulation, which saves data transmission time; at the same time, the multi-relay cooperative transmission method can improve the sensitivity of the system and obtain higher diversity gain; further, it can In the case of only one relay user equipment, the relay transmission is completed for multiple source user equipments, and an obvious bit error rate improvement is obtained.

本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤是可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，例如只读存储器，磁盘或光盘等。Those of ordinary skill in the art can understand that all or part of the steps in the methods of the above embodiments can be implemented through a program to instruct related hardware, and the program can be stored in a computer-readable storage medium, such as a read-only memory, Disk or CD, etc.

以上对本发明实施例所提供的多源多中继协作通信方法、通信设备及网络系统进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。The multi-source and multi-relay cooperative communication method, communication equipment and network system provided by the embodiments of the present invention have been described above in detail. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments It is only used to help understand the method and core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, The contents of this specification should not be construed as limiting the present invention.

Claims

1. A multi-source multi-relay cooperative communication method is characterized by comprising the following steps:

the communication equipment receives a modulation signal transmitted by source user equipment in a first time slot;

the communication equipment receives the modulation signal sent by the source user equipment and the modulation signal sent by the relay user equipment in a second time slot; the modulation signal sent by the relay user equipment is a modulation signal obtained by recovering an information bit sequence of the source user equipment from the modulation signal sent by the source user equipment in a first time slot, carrying out network coding according to the recovered information bit sequence and modulating data obtained after the network coding;

the communication equipment acquires an information bit sequence of the modulation signal sent by the source user equipment before modulation by using the modulation signal received at the first time slot and the modulation signal received at the second time slot;

the communication device acquires the information bit sequence of the modulation signal sent by the source user equipment before modulation by using the signal received in the first time slot and the signal received in the second time slot, and the information bit sequence comprises:

A. the communication equipment obtains a de-interleaved signal of an external log-likelihood ratio corresponding to a modulation signal sent by ith source user equipment of a first time slot, a de-interleaved signal of an external log-likelihood ratio corresponding to a modulation signal sent by ith source user equipment of a second time slot and a de-interleaved signal of an external log-likelihood ratio corresponding to a modulation signal sent by a plurality of relay user equipment which is communicated with ith source user equipment and is cooperated with the ith source user equipment of the second time slot;

B. the communication equipment performs network decoding on a signal subjected to de-interleaving by using an external log-likelihood ratio corresponding to a modulation signal sent by ith source user equipment in a first time slot and a signal subjected to de-interleaving by using an external log-likelihood ratio corresponding to a modulation signal sent by a plurality of relay user equipment in cooperation with the ith source user equipment in a second time slot to obtain a first network decoding result; network decoding is carried out on a signal subjected to de-interleaving by utilizing the external log-likelihood ratio corresponding to the modulation signal sent by the ith source user equipment in the second time slot and a signal subjected to de-interleaving by utilizing the external log-likelihood ratio corresponding to the modulation signal sent by a plurality of relay user equipment which is communicated by the ith source user equipment in cooperation with the second time slot, so as to obtain a second network decoding result;

C. the communication equipment calculates the sum of the de-interleaved signal of the external log-likelihood ratio corresponding to the modulated signal sent by the ith source user equipment of the first time slot, the de-interleaved signal of the external log-likelihood ratio corresponding to the modulated signal sent by the ith source user equipment of the second time slot, the first network decoding result and the second network decoding result, and performs channel decoding on the sum to obtain a first channel decoding result.

2. The method of claim 1,

obtaining the first network decoding result comprises:

acquiring the sum of first type contributions of each relay user equipment for cooperating the communication of the ith source user equipment to the ith source user equipment;

wherein, the first contribution of the relay user equipment cooperating with the ith source user equipment to the ith source user equipment in the first time slot is obtained by using the following formula:

wherein,carrying out forward error correction coding on the recovered information bit sequence of the ith source user equipment for the jth relay user equipment to obtain a signal;indicating a modulated signal transmitted by a source user equipment received at a first time slot communication deviceThe second time slot communication equipment receives the modulation signal transmitted by the relay user equipmentUnder the conditions of (a) under (b),a probability equal to 1;indicating a modulated signal transmitted by a source user equipment received at a first time slot communication deviceThe second time slot communication equipment receives the modulation signal transmitted by the relay user equipmentUnder the conditions of (a) under (b),a probability equal to 0.

3. The method of claim 1,

obtaining the second network decoding result comprises:

acquiring the sum of second contributions of each relay user equipment for cooperating the communication of the ith source user equipment to the ith source user equipment;

wherein the second type of contribution of the relay user equipment cooperating with the ith source user equipment to the ith source user equipment in the second time slot is obtained by using the following formula:

wherein,carrying out forward error correction coding on the recovered information bit sequence of the ith source user equipment for the jth relay user equipment to obtain a signal;indicating a modulated signal transmitted by a source user equipment received at a second time slot communication deviceThe second time slot communication equipment receives the modulation signal transmitted by the relay user equipmentUnder the conditions of (a) under (b),a probability equal to 1;indicating a modulated signal transmitted by a source user equipment received at a second time slot communication deviceThe second time slot communication equipment receives the modulation signal transmitted by the relay user equipmentUnder the conditions of (a) under (b),a probability equal to 0.

4. The method of claim 1, further comprising:

D. the communication equipment interweaves the first channel decoding result and the difference value of the signal after the de-interweaving of the external log likelihood ratio value corresponding to the modulation signal sent by the ith source user equipment of the first time slot to obtain a first interweaving result, and substitutes the first interweaving result into the external log likelihood ratio value calculation formula corresponding to the modulation signal sent by the ith source user equipment of the first time slot; decoding the signal after deinterleaving the external log-likelihood ratio value corresponding to the modulation signal sent by the ith source user equipment in the second time slot to obtain a second channel decoding result; interleaving the second channel decoding result with a difference value of a signal after de-interleaving of an external log-likelihood ratio corresponding to a modulation signal sent by ith source user equipment in a second time slot to obtain a second interleaving result, and substituting the second interleaving result into an external log-likelihood ratio calculation formula corresponding to the modulation signal sent by the ith source user equipment in the second time slot; and performing channel decoding on a signal subjected to de-interleaving by an external log-likelihood ratio corresponding to a modulation signal sent by relay user equipment for the communication of the ith source user equipment in cooperation with the second time slot to obtain a third channel decoding result, interleaving the third channel decoding result with a difference value of the signal subjected to de-interleaving by the external log-likelihood ratio corresponding to the modulation signal sent by the relay user equipment in the second time slot to obtain a third interleaving result, substituting the third interleaving result into an external log-likelihood ratio operation formula corresponding to the modulation signal sent by the relay user equipment in the second time slot, and returning to the step A, B, C until an iteration termination condition is met.

5. The method of claim 1, further comprising:

when the communication equipment judges that the receiving error rate of the communication equipment is smaller than the preset error rate according to the obtained information bit sequence before the modulation of the source user equipment, and when the number of the relay user equipment in the cooperative communication system is smaller than that of the source user equipment, the communication equipment sends indication information indicating that the non-relay user equipment is used as new relay user equipment to the non-relay user equipment in the cooperative communication system;

or,

when the system capacity of the cooperative communication system reaches a preset value and the number of the relay user equipment in the cooperative communication system is smaller than that of the source user equipment, the communication equipment sends indication information indicating that the non-relay user equipment is used as new relay user equipment to the non-relay user equipment in the cooperative communication system.

6. The method of claim 5, further comprising:

the communication equipment receives the receiving error rate of the new relay user equipment sent by the new relay user equipment; determining the number of source user equipment cooperated by the new relay user equipment according to the receiving error rate of the new relay user equipment; wherein the reception error rate of the new relay user equipment is sent to the communication equipment when the reception error rate of the new relay user equipment is less than a threshold;

and the communication equipment sends indication information indicating the number of the user equipment of the cooperation source of the new relay user equipment to the new relay user equipment.

7. A communication device, comprising:

a data receiving unit, configured to receive, in a first time slot, a modulated signal sent by a source user equipment, and receive, in a second time slot, the modulated signal sent by the source user equipment and a modulated signal sent by a relay user equipment; the modulation signal sent by the relay user equipment is a modulation signal obtained by recovering an information bit sequence of the source user equipment from the modulation signal sent by the source user equipment in a first time slot, carrying out network coding according to the recovered information bit sequence and modulating data obtained after the network coding;

a decoding unit, configured to obtain an information bit sequence of the modulation signal sent by the source user equipment before modulation by using the modulation signal received by the receiving unit in the first time slot and the modulation signal received by the receiving unit in the second time slot;

wherein the decoding unit includes:

a multi-user detection unit, configured to obtain an external log-likelihood ratio corresponding to a modulation signal sent by an ith source user equipment in a first time slot, an external log-likelihood ratio corresponding to a modulation signal sent by an ith source user equipment in a second time slot, and an external log-likelihood ratio corresponding to a modulation signal sent by a plurality of relay user equipments in communication with the ith source user equipment in cooperation with the second time slot;

the deinterleaving unit is used for deinterleaving the external log-likelihood ratio value corresponding to the modulation signal sent by the ith source user equipment in the first time slot; de-interleaving external log-likelihood ratios corresponding to modulation signals sent by ith source user equipment in a second time slot; de-interleaving external log-likelihood ratios corresponding to modulation signals sent by the plurality of relay user equipment in a second time slot;

a first network coding and decoding unit, configured to perform network decoding on a deinterleaved signal with an external log-likelihood ratio corresponding to a modulation signal sent by an ith source user equipment in a first time slot and a deinterleaved signal with an external log-likelihood ratio corresponding to a modulation signal sent by a plurality of relay user equipments in cooperation with the ith source user equipment in a second time slot to obtain a first network decoding result;

a second network coding and decoding unit, configured to perform network decoding on a deinterleaved signal with an external log-likelihood ratio corresponding to a modulation signal sent by an ith source user equipment in a second time slot and a deinterleaved signal with an external log-likelihood ratio corresponding to a modulation signal sent by a plurality of relay user equipments in cooperation with the ith source user equipment in the second time slot to obtain a second network decoding result;

the summation unit is used for calculating the sum of a signal after de-interleaving by an external log-likelihood ratio corresponding to a modulation signal sent by the ith source user equipment of the first time slot, a signal after de-interleaving by an external log-likelihood ratio corresponding to a modulation signal sent by the ith source user equipment of the second time slot, a first network decoding result and a second network decoding result;

and the channel decoding unit is used for carrying out channel decoding on the sum calculated by the summation unit to obtain a first channel decoding result.

8. The communication device of claim 7,

a first network coding and decoding unit, configured to obtain a sum of first type contributions, to an ith source user equipment, of each relay user equipment that cooperates with the ith source user equipment for communication;

9. The communication device of claim 8,

a second network coding and decoding unit, configured to obtain a sum of second type contributions of relay user equipments cooperating with the ith source user equipment to the ith source user equipment;

10. The communication device of claim 8,

the channel decoding unit is also used for carrying out channel decoding on the signal after de-interleaving of the external log-likelihood ratio value corresponding to the modulation signal sent by the ith source user equipment in the second time slot to obtain a second channel decoding result; performing channel decoding on a signal subjected to de-interleaving by an external log-likelihood ratio value corresponding to a modulation signal sent by relay user equipment for communication of the ith source user equipment in cooperation with a second time slot to obtain a third channel decoding result;

the decoding unit further includes:

the interleaving unit is used for interleaving the first channel decoding result with a difference value of a signal after de-interleaving of an external log-likelihood ratio value corresponding to a modulation signal sent by ith source user equipment in the first time slot to obtain a first interleaving result; interleaving the second channel decoding result with a difference value of a signal after de-interleaving of an external log-likelihood ratio value corresponding to a modulation signal sent by ith source user equipment of a second time slot to obtain a second interleaving result; interleaving a third channel decoding result with a difference value of a signal after de-interleaving of an external log-likelihood ratio corresponding to a modulation signal sent by the relay user equipment in a second time slot to obtain a third interleaving result; and feeding back a first interleaving result, a second interleaving result and a third interleaving result to the multi-user detection unit, so that the multi-user detection unit substitutes the first interleaving result into an external log-likelihood ratio calculation formula corresponding to a modulation signal sent by the ith source user equipment in the first time slot, substitutes the second interleaving result into an external log-likelihood ratio calculation formula corresponding to a modulation signal sent by the ith source user equipment in the second time slot, and substitutes the third interleaving result into an external log-likelihood ratio calculation formula corresponding to a modulation signal sent by the relay user equipment in the second time slot.

11. The communication device of claim 7, further comprising:

the judging unit is used for judging whether the receiving error rate of the communication equipment is smaller than the preset error rate according to the obtained information bit sequence before the source user equipment is modulated; wherein the communication device is located in a cooperative communication system;

a signaling sending unit, configured to send, when the determination result of the determining unit is yes and the number of the relay user equipments in the cooperative communication system is smaller than the number of the source user equipment, indication information indicating that the non-relay user equipment is used as a new relay user equipment to the non-relay user equipment in the cooperative communication system;

or,

a judging unit configured to judge whether or not a system capacity of the cooperative communication system reaches a predetermined value;

and a signaling sending unit, configured to send, when the determination result of the determining unit is yes and the number of the relay user equipments in the cooperative communication system is smaller than the number of the source user equipment, indication information indicating that the non-relay user equipment is used as a new relay user equipment to the non-relay user equipment in the cooperative communication system.

12. The communication device of claim 11,

the communication device further includes:

a signaling receiving unit, configured to receive a reception error rate of the new relay user equipment sent by the new relay user equipment;

a determining unit, configured to determine, according to the reception error rate of the new relay user equipment, the number of source user equipments with which the relay user equipment cooperates; wherein the reception error rate of the new relay user equipment is sent to the communication equipment when the reception error rate of the new relay user equipment is less than a threshold;

the signaling sending unit is further configured to send, to the new relay user equipment, indication information indicating the number of source user equipments with which the new relay user equipment cooperates.

13. A cooperative communication system, comprising: the communication device, the source user device, and the plurality of relay user devices of any of claims 7-12,

the source user equipment is used for transmitting a modulation signal in a first time slot and transmitting the modulation signal in a second time slot;

the relay user equipment is used for recovering an information bit sequence of the source user equipment from a modulation signal sent by the source user equipment in a first time slot, performing network coding by using the recovered information bit sequence, modulating data obtained after the network coding, and sending the modulation signal obtained by modulation in a second time slot.

14. The cooperative communication system as recited in claim 13,

the communication device is further configured to send indication information indicating that the non-relay user equipment serves as new relay user equipment to the non-relay user equipment in the cooperative communication system when the received bit error rate of the communication device is judged to be smaller than the predetermined bit error rate according to the obtained information bit sequence before modulation of the source user equipment and when the number of the relay user equipment in the cooperative communication system is smaller than the number of the source user equipment;

or,

the communication device is further configured to send, to a non-relay user device in the cooperative communication system, indication information indicating that the non-relay user device is a new relay user device when the system capacity of the cooperative communication system reaches a predetermined value and the number of relay user devices in the cooperative communication system is smaller than the number of source user devices.

15. The cooperative communication system as recited in claim 14, further comprising:

the new relay user equipment is used for judging whether the receiving error rate of the new relay user equipment reaches a threshold value, if so, recovering an information bit sequence of the source user equipment from a modulation signal sent by the source user equipment in a first time slot, carrying out network coding by using the recovered information bit sequence, modulating data obtained after the network coding, and sending a modulation signal obtained by modulation in a second time slot; and if not, transmitting the modulation signal transmitted by the source user equipment in the first time slot to the communication equipment in the third time slot.