基于解码转发的协作频谱感知技术

Spectrum Sensing based on Decode and Forward Retransmission

频谱感知技术中的单点检测设计复杂度低,采用技术成熟,易于实现,但是由于自身的局限性,面临着隐藏终端,感知灵敏度底等问题,而协作分集技术可以克服这些问题。基于解码转发(DF,DecodeAnd Forward)的协作频谱感知技术,利用了分集增益原理,提高了认知用户的单点检测概率,从而改善了整个无线电系统的性能。在瑞利衰落环境下对该检测方案进行分析,并通过与非协作检测的性能比较,说明了协作检测的优势。

The single point detection in spectrum sensing,for its low complexity and mature technology,could be easily implemented.However for its own limitations,it is also confronted with some problems such as hidden terminals,low perception sensitivity,etc.Two shcmes of novel cooperative spectrum sensing based on DF（Decode and Forward） protocols——known as DF-CSS respectively,are proposed,thus to achieve spatial diversity gains and raise he user＇s single point detection in cognitive radio networks.This paper tells of the retransmission spectrum sensing,analyzes the detection scheme in Rayleigh fading environment,and through the comparison with non-cooperative scheme,gives the technical advantages of cooperative detection.