In this article, we apply different adaptive transmission techniques to dual-hop multiple-input multiple-output\r\namplify-and-forward relay networks using orthogonal space-time block coding over independent Nakagami-m\r\nfading channels. The adaptive techniques investigated are optimal simultaneous power and rate (OSPR), optimal\r\nrate with constant power (ORCP), and truncated channel inversion with fixed rate (TCIFR). The expressions for the\r\nchannel capacity of OSPR, ORCP, and TCIFR, and the outage probability of OSPR, and TCIFR are derived based on\r\nthe characteristic function of the reciprocal of the instantaneous signal-to-noise ratio (SNR) at the destination. For\r\nsufficiently high SNR, the channel capacity of ORCP asymptotically converges to OSPR while OSPR and ORCP\r\nachieve higher channel capacity compared to TCIFR. Although TCIFR suffers from an increase in the outage\r\nprobability relative to OSPR, it provides the lowest implementation complexity among the considered schemes.\r\nAlong with analytical results, we further adopt Monte Carlo simulations to validate the theoretical analysis.
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