Abstract
This paper presents a performance analysis for adaptive transmission techniques in a spectrum sharing system in which a primary user (PU) and a secondary user (SU) employ an Alamouti orthogonal space-time block coding (OSTBC) system under correlated antennas over Rayleigh fading channels. The considered adaptive transmission techniques include practical rate-adaptive modulation techniques and classical adaptive transmission techniques, namely, optimal power and rate adaptation (opra), constant transmit power with optimal rate adaptation (ora), and channel inversion with fixed rate (cifr). Closed-form expressions are derived for the following performance metrics: the average spectral efficiency, the outage probability, the average channel capacity, and the average bit error rate (BER) of the system. Using numerical evaluation results, the impacts of antenna correlation on the performance of each adaptive technique in different cases and under various parameters are evaluated. These results provide comprehensive and useful insights about the performance of the considered system under various adaptive transmission techniques.
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