改进的空时协作分集方案及性能分析

Improved cooperative scheme based on space-time code and performance analysis

针对现有基于分布式空时码的放大转发协作协议(AF-DSTC)频谱效率较低的问题,提出了一种新的基于分布式空时码的高效选择性放大转发协作协议(SAF-DSTC)。该方案将协作过程从原来的4个时隙缩短至3个时隙,频谱效率提高了33.3%。理论分析及仿真结果表明:在保持相同频谱效率的情况下,SAF-DSTC在各方面都优于AF-DSTC,系统所耗功率、中断概率和误比特率都大大降低。

To improve the spectral efficiency of current Amplify-and-Forward protocol based on the Distributed Space-Time Code （ AF-DSTC） ,we proposed an improved Selection Amplify-and-Forward protocol based on the Distributed Space-Time Code （ SAF-DSTC） . This improved protocol shortens the cooperative period from four time slots to three slots,that saves 33. 3% of the symbol transmission bandwidth. Theoretical analysis and simulation results show that,at the same spectral efficiency,the proposed SAF-DSTC protocol significantly outperforms the AF-DSTC protocol in terms of the consumed power,outage probability and bit error rate.