Performance Comparison of scheduled TAS/GSC with STBC/GSC in Underlay Cognitive Radios

In this paper, a multiuser cognitive radio (CR) system has been studied as well as analyzed by comparing two significant diversity schemes viz. Transmit antenna selection (TAS) with Space time block coding (STBC) at cognitive transmitter (CR-Tx). Each cognitive receiver (CR-Rx)is employing generalized selection combiner (GSC). The one best CR user is chosen out of all competing CR users on the context of highest instantaneous average signal to noise ratio (SNR) obtained at each CR-Rx. The improved average post processed SNR (APPSNR), Ergodic capacity $(C_{erg})$ and Average bit error rate (ABER) of both the proposed CR models i.e. scheduled TAS/GSC and scheduled STBC/GSC scenarios are functions of the best selected CR-Rx branches and the best CR user. The primary user (PU) outage constraint is satisfied by incorporating transmit power control policy which drives the CR-Tx to adjust its transmitted power. The analytical expressions are derived for all the above defined performance metrics. The achieved simulation outcomes validate the analytical counterpart.

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