Efficient cooperative spectrum sensing for three‐hop cognitive wireless relay networks
Quoc‐Tuan Vien, Brian G. Stewart, Huaglory Tianfield, Huan Xuan Nguyen · IET Communications · 2013
This study is concerned with cooperative spectrum sensing (CSS) mechanisms in three‐hop cognitive wireless relay networks (CWRNs). The data transmission from a source to a destination is realised with the aid of two layers of cognitive radio (CR) users which are in the transmission coverage of two primary users. The authors first propose a new CSS scheme for a layer of CR users to improve the spectrum‐sensing performance by exploiting both local decisions at the CR users and global decisions at the fusion centre. Particularly, the probabilities of missed detection and false alarm for a practical scenario where all sensing, reporting and backward channels suffer from Rayleigh fading are derived. The derived expressions not only show that the proposed CSS achieves a better sensing performance than the conventional scheme but also characterise the effects of the fading channels on the sensing reliability. Furthermore, the authors propose a CSS scheme for two CR layers in a three‐hop CWRN using binary operations to help reduce one phase of sensing for a higher system throughput.