Abstract
Abstract In this paper, we present a comprehensive performance analysis of dual-hop multiple antenna channel state information (CSI) assisted amplify-and-forward (AF) relaying systems over Rayleigh fading channels employing arbitrary transmit antenna selection (TAS) and receiver maximum ratio combining (MRC) with feedback delay in the presence of co-channel interference (CCI) at both the relay and destination. Specifically, an upper bound on the cumulative distribution function (CDF) of the end-to-end signal-to-interference ratio (SIR) is proposed, based on which closed-form expressions for the outage probability and the average symbol error rate (SER) are derived. To gain further insights, simple and high informative expressions for the outage probability and the average SER are obtained at the high SIR regime, which readily enable us to characterize the achievable diversity order and coding gain of the system. Moreover, we present new analytical upper and lower bounds for the ergodic capacity of the system, which apply to the system with arbitrary number of antennas, CCI and feedback delay at any SIRs. Finally, to minimize the outage probability of the system, an optimum power allocation scheme is devised under the total transmission power constraint between the source and the relay. The findings suggest that the feedback delay limits the diversity order to one, while the CCI degrades the outage performance by affecting the coding gain of the system.
Highlights
Relaying transmission has been proposed as a promising technique to improve the coverage and throughput of wireless communication systems [1]
6 Conclusions In this paper, we have investigated the impact of number of antennas, co-channel interference (CCI), and feedback delay on the performance of interference-limited dual-hop multiple antenna CSIassisted AF relaying networks with arbitrary transmit antenna selection (TAS)/maximum ratio combining (MRC)
Simulation results illustrated that the derived approximations for the outage probability and the average symbol error rate (SER) achieved a good match with the exact results
Summary
Relaying transmission has been proposed as a promising technique to improve the coverage and throughput of wireless communication systems [1]. For a wide range of modulation schemes, the average SER is given by Corollary 2 With both the CCI and feedback delay, i.e., ρ < 1, the asymptotic outage probability of interferencelimited dual-hop multiple antenna CSI-assisted AF relaying systems is given by. With both the CCI and feedback delay, i.e., ρ < 1, the asymptotic average SER of the interference-limited dual-hop multiple antenna CSI-assisted AF relaying systems is given by. Two key challenges encountered in the analysis of ergodic capacity include obtaining the exact PDF of the end-to-end SIR and taking expectation of the nonlinear log (·) function To circumvent these challenges, we hereafter seek upper and lower bounds of the ergodic capacity of interference-limited dual-hop multiple antenna CSI-assisted AF relaying systems with feedback delay. The ergodic capacity of interference-limited dual-hop multiple antenna CSI-assisted AF relaying systems with feedback delay is upper bounded by
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