混合译码放大转发的增强选择策略及性能分析

Incremental selection strategy of hybrid decode-amplify forward with performance analysis

为了解决无线协作通信中放大转发方案的噪声放大和译码转发方案的错误传播问题,在现有混合译码放大转发方案基础上,提出一种增强选择的混合译码放大转发策略。研究结果表明:该策略不仅提高了混合译码放大转发系统的频谱效率,而且其误比特率和中断性能也比增强选择放大转发方案有较大改善:当平均误比特率为10-5时,其性能比增强选择放大转发方案提高了约1 d B;当中断概率为10-2时,其性能比混合译码放大转发及增强选择放大转发方案分别提高了约1.2 d B和0.7 d B。

In order to solve the problems of the noise amplification in amplify-and-forward scheme and the error propagation in decode-and-forward scheme, in the wireless cooperative communication systems, an incremental selection hybrid decode-amplify forward strategy was proposed based on current hybrid decode-amplify forward method. The results show that the proposed method can improve the spectrum efficiency of the hybrid decode-amplify forward system. In addition, the bit error rate（BER） and outage performance of the proposed scheme quite outperform that of the current incremental selection amplify forward scheme as follows. At an average BER of 10-5, it obtains about 1 d B performance gain than incremental selection amplify forward scheme. And the outage performance improves about 1.2 d B and 0.7 d B at outage probability of 10^-2, compared with the current hybrid decode-amplify forward scheme and incremental selection amplify forward scheme, respectively.