Cooperative spectrum sensing with censoring of cognitive radios with majority logic fusion in Hoyt fading

Abstract

In this paper, the performance of cooperative spectrum sensing (CSS) is assessed in the presence of Hoyt fading. A cognitive radio (CR) user, which senses the primary users (PUs) using an energy detector (ED) in sensing channel (S-channel), is censored on the basis of the quality of the reporting channel (R-channel). A threshold-based censoring scheme is used: CR users, whose estimated R-channel fading coefficients towards the fusion center (FC) exceed a predefined threshold (denoted as censoring threshold), are allowed to transmit. Majority logic fusion is considered at the FC to estimate the performance in terms of average missed detection and total error probabilities for various values of the censoring threshold, the number of CRs, the false alarm probability, the average S-channel and R-channel signal-to-noise ratios (SNRs), under both perfect and imperfect channel coefficient estimations. The impact of the Hoyt fading parameter on the average missed detection probability is highlighted. Furthermore, an analytical expression for the probability of selection of CRs, in terms of the censoring threshold, is derived and validated with simulations.