A Novel Scheme for Multi-Way Relaying Using Space-Time Network Coding

doi:10.7652/xjtuxb201402014

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A Novel Scheme for Multi-Way Relaying Using Space-Time Network Coding

更新时间：2025-07-09

- A Novel Scheme for Multi-Way Relaying Using Space-Time Network Coding
- Vol. 48, Issue 2, Pages: 80-85(2014)
- 作者机构：
  
  西安交通大学电子与信息工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201402014
  CLC： TN914.42
- Online First：10 February 2014，
  
  Published：2014
- 稿件说明：
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A Novel Scheme for Multi-Way Relaying Using Space-Time Network Coding[J]. 2014, 48(2): 80-85.
DOI：

A Novel Scheme for Multi-Way Relaying Using Space-Time Network Coding[J]. 2014, 48(2): 80-85. DOI： 10.7652/xjtuxb201402014.

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(N>3)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

Since the multiuser relay network in the single-antenna scenario has a low efficiency on full information exchange

a novel wireless multi-way relay communication scheme is proposed by using space time network coding(STNC). The STNC vectors have the following identifiability condition

that is

the modulated signal of multiple users can be combined into one high-order modulated signal via STNC vectors

and the combined signals and the original signals have the one-to-one correspondence. The proposed scheme makes full use of STNC vectors and pre-equalization technique to distinguish information from N(N>3)users

and guarantees a full diversity gain in a multi-period transmission protocol. Moreover

when the system is symmetrical and the total transmission power is a constant

powers are equally allocated among the users and the relay that leads to the minimal symbol error ratio(SER). Furthermore

the achievable average throughput of the proposed scheme is analyzed

and it is shown that its degree of freedom is N/(N-1)times larger than that of the conventional one-way relay(OWR)communication scheme. The SER experimental results show that the proposed scheme acquires full diversity gain and improves the SER performance in fading channels. The throughput simulation results and comparisons with the OWR scheme show that the proposed scheme improves the average throughput in high SNR by 33% and 20% when N=4 and N=6

respectively.

关键词

Keywords

references

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