Performance of scheduled space–time block coding scheme in cognitive multiple‐input–single‐output networks with imperfect channel state information

In this study, the authors study a cognitive multiple‐input‐single‐output network, where the secondary base station (BS) communicates with a secondary destination scheduled from K candidate users. Assuming the scheduled space–time block coding scheme, they investigate the system performance and obtain the exact expressions for the outage probability (OP), symbol error rate (SER) and the achievable rates, taking into account the imperfect channel state information in the secondary BS to secondary receiver Rx link and secondary BS to primary Rx link. Furthermore, the asymptotic expressions for OP and SER in high sigal‐to‐noise ratio region are obtained, from which the coding and diversity gains are readily deduced. Finally, extensive performance evaluation results accompanied with equivalent ones obtained by simulations are provided to verify their analysis.