This book emphasis on Efficient radio spectrum sensing and resource allocation in cognitive radio networks. In this regard a joint two level sensing and power allocation scheme is proposed for hybrid overlay/underlay non-cooperative cognitive radi...

This book emphasis on Efficient radio spectrum sensing and resource allocation in cognitive radio networks. In this regard a joint two level sensing and power allocation scheme is proposed for hybrid overlay/underlay non-cooperative cognitive radio networks. The proposed Fast-Optimale Xplorative (FOX) scheme splits the sensing and power allocation into three phases, fast sensing, optimal detection and explorative resource allocation. The first phase employs Energy Detector(ED) that performs high speed signal sensing for known channel noise levels. This process switches to phase two for optimal sensing for high channel noise. This phase performs accurate sensing using Maximum Eigen Detection(MED) under low signal to noise ratio (SNR) levels. Finally, explore phase implements resource allocation for both overlay/underlay operations based on sensing outcomes (channel free/occupied). Hence the sensing process switches between single phase and dual phase depending noise levels on the channel. The performance of ED is evaluated for Additive White Gaussian Noise (AWGN) and Rayleigh fading Channels. The performance measure involves probability of detection and BER (Bit Error Rate) for both AWGN and Rayleigh fading channels. The investigation and analysis on Energy Detection for the digital modulation techniques discussed above can be used for future reference of spectrum sensing in the cognitive radio networks over AWGN and Rayleigh fading channels.