基于BICM-ID的编码协同在瑞利衰落信道下的性能研究  

Study on performance of BICM-ID based coded cooperative communication over Rayleigh fading channel

作　　者：高勇[1] 雷菁[1] 黄英[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410072

出　　处：《重庆邮电大学学报（自然科学版）》2011年第5期574-579,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

摘　　要：提出一种基于迭代译码的比特交织编码调制(bit interleaved coded modulation with iterative decoding,BICM-ID)的高效编码协同方案,推导了该方案在慢衰落信道和瑞利快衰落信道下的成对错误概率(pair wise error proba-bility,PEP)及误比特率(bit error rate,BER)性能。针对慢衰落信道下迭代译码错误传递问题,采用误帧率(frameerror rate,FER)进行性能分析。通过理论分析和对Gray,DRO,SP 3种映射的仿真得出:在慢衰落信道下,该方案可获得二阶分集增益。采用非迭代译码情况,Gray映射仍为协同通信中用户采用的最佳映射方案,协同状态较非协同状态在误帧率为10-3时,有约11 dB的增益;但当采用迭代译码时,高信噪比下,DRO映射较优,在较低信噪比下,SP映射较优,这2种映射方式较Gray映射有2～3 dB的增益。在瑞利快衰落信道下,没有分集增益,但DRO映射可获得最多的迭代增益。A high-efficient coded cooperative communication scheme based on iterative decoded bit interleaved coded mod- ulation （BICM-ID） is proposed. Derived the pair wise error probability （PEP） and bit error rate （BER） in the slow Ray- leigh fading channels and fast Rayleigh fading channels is derived. The deep fading frame in slow Rayleigh fading channel leads to error propagation in iterative decoding. The paper presents the method of analyzing performance through frame error rate （FER）. Through analysis and simulation on Gray DRO and SP constellation, we get the conclusion that in the slow Rayleigh fading channels full diversity order of two is achieved. When iterative decoding is not available, Gray constellation is still the best choice for cooperative communication, and the gain is about 11 dB compare to non-cooperated communica- tion at 10-3 FER, but when it is available, the better constellation is DRO in high SNR and SP in lower SNR, their gains is 2 -3 dB. In the fast Rayleigh fading channels, there＇s no diversity, but DRO constellation could get highest iterative gain.

关 键 词：比特交织编码调制 编码协同(CC) 映射 成对错误概率(PEP) 

分 类 号：TN925[电子电信—通信与信息系统]