Transceiver Optimization for DF MIMO Relay Systems With a Wireless Powered Relay Node

Li, Bin; Cao, Hanyu; Rong, Yue; Su, Tonghua; Yang, Gang; He, Zhiqiang

doi:10.1109/access.2019.2914020

Cited by 13 publications

(41 citation statements)

References 42 publications

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“…The optimization problem for SWIPT MIMO relay communication systems with TS-based relaying scheme is investigated in [22] for non-regenerative relays. In [23], the works of [21] and [22] are extended to regenerative relaying scheme. In [24], a SWIPT MIMO AF relay communication system is investigated by designing the optimal source matrix and relay matrix to characterize the R-E region defined by the achievable rate of the system and harvested energy at the relay node for the ideal EH scheme, the PS relaying scheme, and the TS relaying scheme.…”

Section: Introductionmentioning

confidence: 99%

Transceiver Design for SWIPT MIMO Relay Systems With Hybridized Power-Time Splitting-Based Relaying Protocol

et al. 2020

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In this paper, we investigate a dual-hop simultaneous wireless information and power transfer (SWIPT) based amplifying-and-forward (AF) multiple-input multiple-output (MIMO) relay communication system where the relay node harvests energy based on radio frequency (RF) signals transmitted from the source node through the hybridized power-time splitting-based relaying (HPTSR) protocol to forward information to the destination node. The joint optimization of the time-switching (TS) factor, source and relay precoding matrices, and the power-splitting (PS) ratio vector is proposed to maximize the mutual information (MI) between the source and destination nodes. We derive the optimal structure for the source and relay precoding matrices to simplify the transceiver optimization problem. Two algorithms based on the upper bound and lower bound of the objective function are proposed to efficiently solve the optimization problem with low computational complexity. Numerical examples demonstrate that the proposed algorithms provide a better MI performance compared with TS based and PS based energy harvesting (EH) relay systems. INDEX TERMS Amplify-and-forward (AF) relay, energy harvesting, hybridized power-time switching relaying (HPTSR), multiple-input multiple-output (MIMO) relay, simultaneous wireless information and power transfer (SWIPT)

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Section: Introductionmentioning

confidence: 99%

Transceiver Design for SWIPT MIMO Relay Systems With Hybridized Power-Time Splitting-Based Relaying Protocol

et al. 2020

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“…Considering this, multiple‐antennas in MIMO configuration can be very useful to increase the data rates significantly using spatial multiplexing and also to achieve higher power transfer efficiency for the SWIPT schemes. Inspired by this, several researchers have proposed and analyzed the MIMO relay networks with SWIPT schemes 12‐21 …”

Section: Introductionmentioning

confidence: 99%

“…In contrary to this, decode‐and‐forward (DF) protocol is regenerative in nature implying that noise is not propagated in DF relay networks. Therefore, DF based MIMO relay networks have been considered in this article following the works of References 17‐21. In Reference 17 distributed precoding is studied in order to improve performance of SWIPT considering separate EH and ID receivers at the destination.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is noteworthy that EH has not been considered at relay in References 17,18. Precoding matrices at both source and relay have been optimized in order to maximize the overall achievable transmission rate for energy‐constrained DF‐based MIMO relay networks in References 19‐21. In Reference 19, the optimal structures for the precoding matrices are presented considering TS and PS schemes at the relay.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, two suboptimal antenna assignment algorithms have been proposed in Reference 20. Similarly, the optimal covariance matrices have been derived in Reference 21 considering both TS and PS schemes for the DF MIMO relay networks.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the ergodic capacities of decode‐and‐forward MIMO relay network with simultaneous wireless information and power transfer

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Trans Emerging Tel Tech

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In this article, simultaneous wireless information and power transfer (SWIPT) has been studied for point‐to‐point decode‐and‐forward (DF) based multiple‐input‐multiple‐output (MIMO) relay network with an energy‐constrained relay. This relay is capable of harvesting energy from the wireless signals received from the source terminal. In particular, three different SWIPT schemes, that is, time switching, power splitting, and antenna switching are considered for EH at relay. New closed‐form approximations for the sum ergodic capacity of a DF MIMO relay network have been derived with spatial multiplexing at source, zero‐forcing receivers at relay and destination. Based on the sum capacity approximations, optimal splitting coefficients for aforementioned SWIPT schemes that maximize the sum capacity are presented. Moreover, the impact of system parameters on these optimal coefficients has been studied. In addition to this, first optimization problems for the number of antennas at relay have been formulated and then these problems are transformed into concave form by relaxing constraints to be defined over positive real numbers instead of taking only discrete values. New closed‐form solutions for the optimum number of antennas at relay have been derived. Furthermore, new closed‐form approximations for the ergodic capacities in the presence of an external co‐channel interference are also presented. Numerical results show that approximations for the sum capacity match well with the exact ones obtained through Monte‐Carlo simulations, particularly when the channel hardening effect kicks in, that is, for large degrees of freedom. Finally, the solutions for the optimization problems have also been validated by the numerical examples.

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Optimal precoders and power splitting factors in multiuser multiple‐input multiple‐output cognitive decode‐and‐forward relay systems with wireless energy harvesting

Kha

2021

Int J Communication

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This paper considers an underlay cognitive radio (CR) wireless network with the assistance of a two-hop decode-and-forward (DF) relay node. Different from the conventional CR relay networks, in this paper, the relay node using power-splitting (PS) techniques harvests wireless energy transmitted from the secondary base station (SBS) and, then, uses its harvested energy to forward the received signals to multiple secondary receive users (SRUs). Due to the highly mutual dependence of the transmission strategies at nodes on the system performance, the optimal design of signal processing at transceivers to efficiently handle the interference and energy constraints is crucial. This paper studies the jointly optimal design of the precoders, PS factors to maximize the minimum user rate under the transmit power, harvested energy, and interference power constraints. Owing to the nonlinearly and mutually coupled design matrix variables in both objective function and constraints, the joint design of the precoders and PS factors for the concerned problem is mathematically challenging. To tackle these difficulties, we devise the appropriate surrogate functions to recast the nonconvex optimization problem into the convex one.By using the minorization-maximization framework, an efficient iterative algorithm with provable convergence is developed by solving the convex optimization problem in each iteration. Numerical results are provided to evaluate the achievable user rate performance of the considered system and investigate the effects of the interference power thresholds at the primary receive users and the number of antennas at the SBS and the relay on the minimum achievable user rate. K E Y W O R D S cognitive radio, MIMO users, relay networks, simultaneously wireless information and power transfer (SWIPT) 1 | INTRODUCTION Cognitive radio (CR) has been recognized as an effective means to deal with the spectrum scarcity for the next generation of wireless communications. In underlay CR approaches, secondary users (SUs) can communicate at the same time

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Transceiver Optimization for DF MIMO Relay Systems With a Wireless Powered Relay Node

Cited by 13 publications

References 42 publications

Transceiver Design for SWIPT MIMO Relay Systems With Hybridized Power-Time Splitting-Based Relaying Protocol

Transceiver Design for SWIPT MIMO Relay Systems With Hybridized Power-Time Splitting-Based Relaying Protocol

On the ergodic capacities of decode‐and‐forward MIMO relay network with simultaneous wireless information and power transfer

Optimal precoders and power splitting factors in multiuser multiple‐input multiple‐output cognitive decode‐and‐forward relay systems with wireless energy harvesting

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