On performance of cooperative spectrum sensing based on improved energy detector with multiple antennas in Hoyt fading channel

摘要

In this paper, the performance of cooperative spectrum sensing with multiple antennas at each cognitive radio (CR) has been assessed in both Hoyt faded and non-faded (additive white Gaussian noise) environments. The CRs which employ improved energy detector (IED) utilize selection combining (SC) of the decision statistics obtained by IEDs for making hard decisions about the presence or absence of a primary user (PU). We analytically derive expressions of probability of missed detection in both the environments. Several types of hard decision fusion rules such as OR rule, AND rule and MAJORITY rule are investigated at fusion center (FC) to obtain the final decision about PU. Comparison among the fusion rules has been carried out for a wide range of average signal-to-noise ratio (SNR) values in Hoyt fading environment. The performance has been assessed in terms of missed detection and false alarm probabilities in both the environments. The performance has also been investigated in terms of total error probability for different values of IED parameter (p), normalized detection threshold, different number of antennas and number of CRs in Hoyt fading environment. Impact of Hoyt fading parameter on detection performance is indicated.