Distributed MMSE Relay Strategies for Wireless Sensor Networks

Near-Optimal Nonlinear Forwarding Strategy for Two-Hop MIMO Relaying

“…The work in (7; 8) investigates linear relay processing for the MIMO relay channel. In this paper, in contrast to (6)(7)(8)(9), we study an uncoded system, and we propose a nonlinear relaying scheme which is superior to linear relaying and performs close to the theoretical bound. Our proposed scheme is based on constellation permutation (10; 11) at the relay over different streams obtained by channel orthogonalization.…”

MMSE-Based amplifying relay matrix for noncooperative AF wireless relay network under power constraints

“…In relation to this, various relay schemes, such as nonregenerative amplify-and-forward (AF), regenerative decode-and-forward (DF), selective decode-and-forward (SDF), and compress-and-forward (CF), have been studied in [1]- [6]. The nonregenerative AF relay scheme employed in this current paper is a more popular and realistic protocol due to no required signal processing at the relay nodes for decoding and compressing procedures compared to the other three relay schemes.…”

“…In addition, efficient amplifying relay matrices using different objective functions and power constraints have been sou- ght for a single-input-single-output AF network [6]- [8]. In [6], the authors presented the AF relay strategy under the received signal power constraint at the destination node for a onesource-one-destination pair and -relay node network.…”

“…In [6], the authors presented the AF relay strategy under the received signal power constraint at the destination node for a onesource-one-destination pair and -relay node network. The advantage of using the power constraint at the destination node instead of the source node or the relay nodes is to accomplish a better performance by maximizing the received signal component power.…”

“…The advantage of using the power constraint at the destination node instead of the source node or the relay nodes is to accomplish a better performance by maximizing the received signal component power. A solution of closed form in (82) of [6] can only be achieved with an assumption of low-noise relay nodes. And, under this assumption, multiple approximations were used in [6].…”