一种采用空时网络编码的多向中继通信方案

发布时间：2018-06-01 15:48

本文选题：多向中继通信 + 空时网络编码　；参考：《西安交通大学学报》2014年02期

【摘要】：针对多用户中继通信网络在单天线场景下多源信息交互效率较低的问题,提出了一种采用空时网络编码(STNC)的多向中继通信方案。由于STNC编码向量具备可识别条件,能够将多个用户的调制信号合并为一个高阶调制信号,且合并前后的信号一一对应,因此该方案可利用STNC编码向量和预均衡技术来区分N(N3)个用户的信息,能够保证用户在多周期传输方案中获得满分集增益。当系统结构对称时,该方案在系统总发射功率相等的情况下,可平均分配中继和用户之间的功率,使系统误符号率(SER)性能最优。此外,推导了该通信方案的平均吞吐量,指出其系统自由度是传统的单向中继(OWR)方案的N/(N-1)倍。实验结果表明:该方案能够获得满分集增益,与传统的双向中继方案相比显著提高了系统在衰落信道中的误码性能;当N为4和6时,在高信噪比条件下,该方案的平均吞吐量相对OWR方案分别提高了33%和20%。
[Abstract]:In order to solve the problem of low efficiency of multi-source information exchange in multi-user relaying networks with single antenna scenario, a multi-direction relay communication scheme using space-time network coding (STNC) is proposed. Because of the recognizable condition of the STNC coding vector, the modulated signals of multiple users can be combined into one high-order modulation signal, and the signals before and after the combination can be matched one-to-one. Therefore, the scheme can use STNC coding vector and pre-equalization technology to distinguish the information of NN3 users, and can guarantee the users gain full diversity in the multi-period transmission scheme. When the system structure is symmetrical, when the total transmission power of the system is equal, the power between the relay and the user can be equally allocated, so that the system error symbol rate (SERR) performance is optimized. In addition, the average throughput of the proposed scheme is derived, and it is pointed out that the degree of freedom of the system is more than that of the traditional one-way relay OWR scheme. The experimental results show that the proposed scheme can obtain full diversity gain, and compared with the traditional bidirectional relay scheme, the BER performance of the system in fading channel can be improved significantly, and when N is 4 and 6, the proposed scheme can improve the performance of the system under the condition of high signal-to-noise ratio (SNR). The average throughput of the scheme is 33% and 20% higher than that of the OWR scheme, respectively.
【作者单位】：西安交通大学电子与信息工程学院;
【基金】：国家自然科学基金资助项目(61102079,61102080) 陕西省科学技术研究发展计划资助项目(2012K06-35)
【分类号】：TN915.01

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