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中继无线网络分布式空时码与相关合并技术比较性研究随着无线通信技术的发展，对传输距离及可靠性等方面要求与日俱增。如何抑制多径衰落，提高信号误码率，进行长距离传输成为一个受到高度关注的问题。中继无线网络通过中继节点实现信源与信宿之间的两跳传输，延长传输距离，因此得到广泛应用。33696
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论文主要研究应用于单向中继无线网络中的两个主要技术：
(1) 分布式空时分组码(Distributed Space-Time Block Coding, DSTBC)。DSTBC是应用于中继无线网络的空时分组码，可通过空间分集增益来提高信号误码率。研究多中继环境下正交DSTBC、准正交DSTBC及旋转准正交DSTBC的编码与解码准则，比较不同编码准则误符号率性能，仿真表明，在中继数为2，调制为 情况下，旋转准正交DSTBC的误码性能最佳。
(2) 为了充分挖掘中继协作网络的协作分集，提高误码性能，重点研究了四种相干合并技术：最大比合并(Maximal Ratio Combining, MRC)加DSTBC，接收信道相位抵消合并加DSTBC，基于波束成形的双向相位抵消算法以及MRC加匹配滤波(Matched Filter, MRC plus MF)算法。同时在中继端引入空间信道配对(Space Channel Pairing, SCP)算法，进一步提高误码性能。仿真表明，在合并算法中，引入SCP能显著提高误码性能，同时能在一定程度上改善速率性能。
关键词 分布空时分组码 误符号率 相关合并 空间信道配对
毕业论文设计说明书外文摘要
Title A Comparison Investigation of Distributed Space-Time Coding and Coherent Combining in Wireless Relay Networks
Abstract
With the rapid development of wireless communication, the demand on communication distance and reliability increases greatly. How to mitigate multi-path fading and improve symbol error rate in long distance transmission becomes a highly-focused issue. Wireless relay networks have been applied widely because they can achieve two-hop transmission from the source to destination so as to extend transmission distance.
The thesis focuses on two major techniques applied to wireless relay network:
(1) Distributed space-time block coding (STBC). Distributed STBC (DSTBC) applied to wireless relay networks can improve symbol error rate (SER) by exploiting spatial persity gains. In the thesis, we provide a detailed analysis of the coding and decoding protocol of orthogonal STBC, quasi-orthogonal STBC and rotated quasi-orthogonal STBC in multi-relay environment. The simulation results show that the rotated quasi-orthogonal DSTBC is optimal in the SER sense when the number of relays is two and quadrature phase shift keying is used.
(2) Coherent combining schemes. Four schemes of coherent combining and DSTBC are investigated, including channel phase information (CPI) plus DSTBC, maximal ratio combining (MRC) plus DSTBC, CPI plus CPI plus DSTBC and MRC plus matched filter (MF). We introduce a space channel pairing (SCP) to coherent combining scheme. And the simulation results show that the proposed SCP can enhance reliability greatly and improve the rate performance slightly.
Keywords DSTBC SER coherent combining SCP
目 次
1 绪论 1
1.1 研究背景 1
1.2 国内外研究现状 2
1.3 论文组织安排 3
2 中继无线网络分布式空时码的编解码技术 4
2.1 引言 4
2.2 系统模型 4
2.3 分布式空时分组码的编码 8
2.4 分布空时分组码解码 10