Relay and antenna selection in multi-antenna amplify-and-forward (AF) systems with partial channel state information

Design of Cooperative MIMO Wireless Sensor Networks With Partial Channel State Information

“…Besides the single-relay selection method described in Subsection III-B, referred to as "1-R Selection", and the joint antenna-and-relay selection scheme developed in Subsection III-C, referred to as "JAR Selection", we also report the performance of [26,CSI Assumptions I and II] in the case of single-antenna nodes (i.e., N = 1) and that of [31] for both single-and multiple-antennas nodes (i.e., N ∈ {2, 3}). As a reference lower bound, we additionally include in all the plots the ASEP curves of the F-CSI design proposed in [15], whose design relies on the additional knowledge of the ith second-hop channel matrix G G G i at the ith relay, for i ∈ {1, 2, .…”

“…It has been shown in [30] that P-CSI relay selection approaches for MIMO nodes, based only on the instantaneous knowledge of H H H, do not fully exploit the diversity arising from the presence of multiple relays. Besides instantaneous knowledge of H H H, statistical CSI of the second-hop matrix G G G is used in [14], [31] to perform relay/antenna selection for a MIMO AF cooperative network. However, the solutions developed in [14], [31] still exhibit a significant performance degradation compared to designs based on F-CSI.…”

“…Besides instantaneous knowledge of H H H, statistical CSI of the second-hop matrix G G G is used in [14], [31] to perform relay/antenna selection for a MIMO AF cooperative network. However, the solutions developed in [14], [31] still exhibit a significant performance degradation compared to designs based on F-CSI.…”

“…In this paper, we present new optimization methods for multiple-relay cooperative MIMO WSNs with P-CSI, i.e., knowledge of the instantaneous value of H H H and the statistical properties of G G G. Our design does not rely on F-CSI as in [7]- [13], [15]- [17], and needs the same amount of P-CSI exploited in [24]- [28], [31]. In this scenario, we consider a relaxed joint minimum-mean-square-error (MMSE) optimization of the source precoder F F F 0 , the AF relaying matrices in F F F, and the destination equalizer D D D, with a power constraint at the source [32] and a sum-power constraint at the relays [10].…”

“…2) We provide the proofs of the results reported in [14], by enlightening that single relay selection [14], [24]- [28] is suboptimal in the considered P-CSI scenario. 3) We develop a new joint antenna-and-relay selection algorithm, which is shown to significantly outperform the relay/antenna selection approaches [14], [26], [31] in terms of average symbol error probability (ASEP). The paper is organized as follows.…”