Impact of Antenna Correlation on the BER Performance of a Cognitive Radio Network with Alamouti STBC

摘要

This letter presents an average bit error-rate (BER) performance analysis for spectrum sharing in a cognitive radio network in which primary and secondary users employ Alamouti space-time block coding (STBC) under correlated antennas over Rayleigh fading channels. Closed-form expressions are derived for the cumulative density function (CDF) of the secondary user’s signal-to-noise-ratio (SNR) under correlated antennas. Then, closed-form expressions are derived for the average BER of the system with coherent modulation schemes as well as with noncoherent modulation techniques. Using numerical evaluation results from the derived expressions, verified by Monte Carlo simulations, the impacts of antenna correlation on the average BER of the system in different cases are evaluated.