AN INNOVATIVE COOPERATIVE SPECTRUM SENSING ALGORITHM WITH NON-IDEAL FEEDBACK CHANNELS AND DELAY CONSIDERATIONS

Abstract

Key Words: Cognitive Radio 1; Spectrum Sensing 2; Energy Detection 3; Cooperative Sensing 4; Cooperation Delay 5 Summary: Cooperative Sensing (CS) was suggested to enhance the robustness of the SS decisions. CS has challenges of its own including the choice of the optimum fusion technique, the e ect of non-ideal feedback channels as well as the e ect of delay on the quality of the decisions. In this context, we first propose a simple CS algorithm, which combines the local decision at each CR along with a group decision received from a fusion center to produce a collective decision. The algorithm is shown to provide more robustness against reporting channel errors than the conventional hard decisions-based algorithm. Finally, the modified algorithm is shown to dramatically improve the performance in terms of probability of detection for di erent delay scenarios.