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提出了一种基于分布式空时码的非正交协作分集(DSTC-NOCD)系统.利用译码转发(DF)中继信道模型,推导了BPSK星座调制下系统误码率的理论值,并分析了协作用户上行信道和用户间信道质量对系统性能的影响.仿真结果表明:与直接传输系统相比,DSTC-NOCD系统能获得显著的性能增益,在用户间信道高信噪比条件下能获得完全分集增益;且在可接受的性能损失条件下能够获得比OCD系统更高的频谱效率.
A distributed non-orthogonal cooperative diversity (DSTC-NOCD) system based on distributed space-time code is proposed.The theoretical error rate of system under BPSK constellation modulation is deduced by using DF channel model The influence of channel quality between users on uplink and between users is analyzed.The simulation results show that compared with direct transmission system, DSTC-NOCD system can obtain significant performance gain, which can be used in high signal-to-noise ratio Achieve full diversity gain; and achieve higher spectral efficiency than OCD systems with acceptable loss of performance.