Feedback-error-resistant and reduced feedback-rate orthogonal space-time block coding scheme employing single transmit antenna selection

Abstract

A novel and generic transmit diversity scheme that employs combined single transmit antenna selection (TAS)/orthogonal space-time block coding (OSTBC) scheme with reduced feedback-rate and robust error performance in the presence of feedback errors (FEs) is introduced in this paper. Statistical expressions and performance metrics related to the post-processing signal-to-noise ratio of the proposed scheme are derived for Nakagami-m fading channels considering that the channel estimation process is error-free and the feedback information is delivered to the transmitter side with no delay. Exact expressions for outage probability and bit/symbol error rates of M-ary signals are presented to examine the system performance in the presence of FEs extensively. Also, the asymptotic analysis is provided to explore the asymptotic diversity order and the asymptotic coding gain of the proposed scheme that is compared with that of the conventional TAS/OSTBC scheme from different perspectives. The proposed scheme is shown to provide not only full-diversity order as the conventional scheme for perfect feedback case but also superior error performance in the presence of FEs. Moreover, the error performances of both schemes and the superiority of the modified scheme are examined by considering an error-correcting structure in the feedback link.