Ergodic capacity for MUD/SD cognitive radio system
基于MUD/SD的认知无线电系统遍历容量研究

This paper proposed a new multi-user diversity spectrum-sharing cognitive radio system model based on multiple antennas switch diversity receiver. Compared with traditional multi-user diversity spectrum-sharing system model, this model improved cognitive user system channel ergodic capacity because of valid multiple antennas switch diversity gain in cognitive receiver. Utilizing the derived cumulative distribution function and probability density function of the cognitive received signal-to-noise ratioSNR, it investigated the channel ergodic capacity of cognitive users system. For the case of unlimited cognitive user transmit power, it also derived the closed-form expression for the ergodic capacity.