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

Bing, Justin Lee; Rong, Yue; Gopal, Lenin; Chiong, Choo W. R.

doi:10.1109/access.2020.3032120

Cited by 8 publications

(18 citation statements)

References 41 publications

(81 reference statements)

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“…Similarly, the SWIPT MIMO AF relay system with single source, single relay, and single destination was also investigated in. 8 However, the authors in 8 proposed a hybrid EH protocol by combining the TS and PS strategies for EH at the relay. In, 16 the authors studied the SWIPT DF MIMO relay network in which one source, one relay and one EH node and one ID node.…”

Section: Related Workmentioning

confidence: 99%

“…However, using the different PS factors at different antennas can provide additional degrees of freedom for optimizing the overall performance of the EH enabled systems. 8 Denote W ¼ diagðw 1 , w 2 , …, w N R Þ as the PS factors at the relay antennas. The signal for ID is written as…”

Section: System Model and Problem Formulationmentioning

confidence: 99%

“…Especially, the performance of wireless devices is highly relied on the energy constraints. 8 Although the energy-constrained devices can replenish their energy from natural renewable resources as solar and wind, these natural resources are unreliable and unpredictable. 8 Alternatively, wireless energy harvesting (EH) technologies have received the extensive attention from the academia and industry since they can provide the higher EE and prolong the lifetime of the power-constrained wireless devices.…”

mentioning

confidence: 99%

“…8 Although the energy-constrained devices can replenish their energy from natural renewable resources as solar and wind, these natural resources are unreliable and unpredictable. 8 Alternatively, wireless energy harvesting (EH) technologies have received the extensive attention from the academia and industry since they can provide the higher EE and prolong the lifetime of the power-constrained wireless devices. 4,9 Practically, the EH techniques are especially suitable for the wireless sensor networks 5 and Internet of things (IoT).…”

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confidence: 99%

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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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Section: Related Workmentioning

confidence: 99%

Section: System Model and Problem Formulationmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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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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“…Among these works, a brief review of single-hop AF relaying approaches is given as follows. In [2], for the multipleinput multiple-output (MIMO) SWIPT-based AF-TWR systems with hybridized power-time splitting ratios and precoders are obtained via the maximization of convexified bounds on the sum rate. In [24], [25], transceivers and splitting ratios are designed via semi-definite relaxation (SDR) based convex optimization technique for finite constellation symbols.…”

Section: Introductionmentioning

confidence: 99%

Rate-Energy Balanced Precoding Design for SWIPT based Two-Way Relay Systems

Garg¹,

Zhang²,

Ratnarajah³

2021

Preprint

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Simultaneous wireless information and power transfer (SWIPT) technique is a popular strategy to convey both information and RF energy for harvesting at receivers. In this regard, we consider a relay employing SWIPT strategy, where splitting the received signal leads to a rate-energy trade-off. In literature, the works on transceiver design have been studied using computationally intensive and suboptimal convex relaxation based schemes. In this paper, we study the balanced precoder design using chordal distance (CD) decomposition to provide a better rate-energy trade-off, which incurs much lower complexity and flexible to dynamic energy requirements. It is analyzed that given a non-negative value of CD, the achieved harvested energy for the proposed balanced precoder is higher than that for the perfect interference alignment (IA) precoder, while verifying the analyzed loss in sum rates. Simulation results verify the analysis and add that the IA schemes based on mean-squared error are better suited for the SWIPT maximization than the subspace alignment-based methods.

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