Transmission schemes of cognitive radio system with power control over Rayleigh fading (ソフトウェア無線)

概要

論文の詳細を見る
This paper addresses the transmission schemes of cognitive radio system (CRS) with power control. An adaptive power control scheme in Rayleigh fading channel is proposed. The transmit power of a secondary user (SU) is adjusted in Rayleigh fading to maximize the constant output signal-to-noise ratio (SNR) at an SU receiver while keeping the interference to a primary user (PU) under given constraints. To calculate the maximum constant output SNR at the SU receiver under the interference constraints of the PUs, we develop an analytical model for the distribution of the interference to PUs while considering the detection performance at the SUs. The analytical model takes into account of the use of multiple antennas and includes a single antenna scenario as a special case. The CRS transmission with the proposed adaptive power control scheme is compared with the transmission using a straightforward fixed power control scheme for the CRS in terms of bit-error-rate (BER). Results show that the proposed adaptive power control scheme outperforms the fixed power control scheme. For example, when the BER is 10^<-3> the adaptive power control scheme with two transmit antennas and two receive antennas has a 3-dB improvement in SNR as compared with the fixed power control scheme.
社団法人電子情報通信学会の論文
2009-07-22