Weighted cooperative sensing with plural antenna elements

Abstract

This paper investigates a cooperative spectrum sensing to implement the spectrum sharing system. In the cooperative sensing, observations of multiple secondary users (SUs) are used to detect presence of PS. There are two approaches in cooperative sensing. The first approach is non-weighted cooperative sensing (NWCS). The second approach is a weighted cooperative sensing (WCS) where the weight is used to enhance the sensing performance. In this paper, we study a WCS, where the weight is designed based on a PS signal energy and the noise power. To estimate the PS signal energy, an estimation method is employed. In addition, our WCS implements plural antenna elements to suppress the effect of Rayleigh fading. Computer simulations show that the proposed WCS can outperform the conventional NWCS under shadow and Rayleigh fading environment.