Analysis of diversity schemes employing antenna selection in the presence of channel estimation errors and feedback delay

Abstract

The main objective of this paper is to provide an extensive and complete examination on the effect of practical impairments such as channel estimation errors (CEEs) and feedback delay (FD) on the performance of diversity schemes over Nakagami-m fading channels. Under erroneous channel estimation and outdated feedback cases, statistical expressions and several performance metrics related to the post-processing signal-to-noise ratio (SNR) are derived for four different diversity schemes: transmit antenna selection (TAS)/orthogonal space-time block coding, TAS/maximal-ratio transmission (MRT), MRT/receive antenna selection (RAS), and joint transmit and RAS. Exact analytical expressions for outage probability and average error rates of M-ary modulations are derived in order to provide insightful perspectives on the capacity and error performance of diversity schemes that experience both CEE and FD. The asymptotic diversity order of the investigated diversity schemes are derived via a high-SNR approximation approach. In order to assess the real-world performance of the investigated diversity schemes and to observe their robustness or sensitivities in practical imperfections, various configurations are considered together with several performance comparisons. Also, Monte Carlo simulations are performed in order to validate the theoretical results. Copyright (c) 2014 John Wiley & Sons, Ltd.