基于准正交空时分组码的多中继协作方案

A Multi-relay Cooperation Scheme Based on QOSTBC

根据准正交空时分组码提出了一种基于选择中继协议的多中继协作方案。从两个方面讨论了该方案的空间分集性能,通过分析成对差错概率证明,若所有的中继都正确译码,该方案可以获得全分集增益;若某些中继不能正确译码,该方案仍可以获得部分分集增益。将所提方案与使用正交空时分组码的协作方案进行比较,仿真结果表明,在信噪比较高时,两个方案都可获得全分集增益,但所提方案具有更高的编码增益。而当信噪比变低时,所提方案具有更高的分集增益和编码增益。

A multi-relay cooperation scheme based on selection relaying （SR） protocol based on quasi-orthogo- nal space-time code （QOSTBC） is presented. The spatial diversity performance of the scheme is discussed from two aspects： pair wise error probability （PEP） analysis shows that if all the relays correctly decode the information, the scheme can achieve full diversity gains ; and if certain relays unsuccessfully decode the information, the scheme can only obtain partial diversity gains. A comparison between the proposed scheme and the cooperation scheme utilizing orthogonal Space-Time code （OSTBC） demonstrates that both schemes can achieve full diversity gains at high signal- to-noise ratio （SNR）, but the proposed scheme has higher coding gains. And when the SNR becomes lower, the proposed scheme has higher diversity and coding gains.