基于Alamouti编码的协作频谱检测性能分析

摘要

Aiming at the problem of spectrum detection in cognitive radio systems, this paper proposes a coordination communication reporting scheme combined with Alamouti coding and Time Division Multiple Access(TDMA), and does the detection performance analysis. The probability formulae of false alarm, missed detection and the minimum probability of false alarm are derived. Analysis results show that, as the quality of local user channel gets better, Symbol Error Rate(SER) of reporting channel decreases with a coding gain more than 3 dB, and the minimum probability of false alarm decreases obviously.%针对感知无线电系统的频谱检测问题,设计Alamouti空时编码与时分多址方式相结合的协作通信上报方案,并对其检测性能进行分析.推导系统误告警概率、漏告警概率和误告警概率下限的理论表达式.分析结果表明,该方案的上报误码率会随本地用户交互信道质量的改善而下降,编码增益可达3dB以上,系统误告警概率的下限降低.