Performance of a Smart Antenna Equipped Cognitive Radio System in Rayleigh-Fading Channel

摘要

Conventional cognitive radios exploit the licensed spectrum by opportunistically seeking the underutilized radio resource in time, frequency and geographic domains. But using smart antennas, the angle (space) spectrum can be utilized and thus leading to multiplexing of multiple users in the same channel at the same time in the same geographical area whereby leading to efficient spectrum utilization in wireless communication networks. We investigate the performance of cognitive radios equipped with smart antennas in utilizing the spatial diversity in the angle dimension in Rayleigh fading channel. As proposed, the cognitive transmitter equipped with smart antenna should keep the interference to the primary receiver below a given threshold while at the same time ensuring high enough SINR at the cognitive receiver. For a given cognitive transmitter location, the region where cognitive receivers can be deployed is determined under Rayleigh fading channel and compared with a non-fading channel.