AF Relaying with Energy Harvesting Source and Relay

Chen, Yunfei; Shi, Rui; Feng, Wei; Ge, Ning

doi:10.1109/tvt.2016.2556639

Cited by 36 publications

(28 citation statements)

References 18 publications

(30 reference statements)

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“…Such devices, termed as relays, may adopt various cooperative strategies like regenerative (e.g., decode-and-forward (DF) [3]), and nonregenerative (e.g., amplify-and-forward (AF) [4]). In practice, non-regenerative relaying strategy is easy to implement with freedom to choose different transmit modulation schemes [5].…”

Section: Introductionmentioning

confidence: 99%

Sequential Resource Distribution Technique for Multi-User OFDM-SWIPT Based Cooperative Networks

Gautam

Lagunas

Chatzinotas

et al. 2018

2018 IEEE Global Communications Conference (GLOBECOM)

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In this paper, we investigate resource allocation and relay selection in a dual-hop orthogonal frequency division multiplexing (OFDM)-based multi-user network where amplifyand-forward (AF) enabled relays facilitate simultaneous wireless information and power transfer (SWIPT) to the end-users. In this context, we address an optimization problem to maximize the end-users' sum-rate subjected to transmit power and harvested energy constraints. Furthermore, the problem is formulated for both time-switching (TS) and power-splitting (PS) SWIPT schemes. We aim at optimizing the users' SWIPT splitting factors as well as sub-carrier-destination assignment, sub-carrier pairing, and relay-destination coupling metrics. This kind of joint evaluation is combinatorial in nature with non-linear structure involving mixed-integer programming. In this vein, we propose a sub-optimal low complex sequential resource distribution (SRD) method to solve the aforementioned problem. The performance of the proposed SRD technique is compared with a semi-random resource allocation and relay selection approach. Simulation results reveal the benefits of the proposed design under several parameter values with various operating conditions to illustrate the efficiency of SWIPT schemes for the proposed techniques.

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Section: Introductionmentioning

confidence: 99%

Sequential Resource Distribution Technique for Multi-User OFDM-SWIPT Based Cooperative Networks

Gautam

Lagunas

Chatzinotas

et al. 2018

2018 IEEE Global Communications Conference (GLOBECOM)

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“…Two schemes are further proposed in [11] coordinating the information processing (IP) and EH, which are time switching (TS) and power splitting (PS). In [12][13][14][15][16], a relaying network where an energy-constrained relay node using SWIPT and TS or PS schemes is considered. In particular, the outage probability expressions and the ergodic capacity are derived in [12,16], and effects of various system parameters are illustrated.…”

Section: Introductionmentioning

confidence: 99%

Outage Analysis and Power Allocation Optimization for Multiple Energy-Harvesting Relay System Using SWIPT

Liu

Zhu

Wang

2018

Mobile Information Systems

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Energy harvesting (EH) combined with cooperative relying plays a promising role in future wireless communication systems. We consider a wireless multiple EH relay system. All relays are assumed to be EH nodes with simultaneous wireless and information transfer (SWIPT) capabilities, which means the relays are wirelessly powered by harvesting energy from the received signal. Each EH node separates the input RF signal into two parts which are, respectively, for EH and information transmission using the power splitting (PS) protocol. In this paper, a closed-form outage probability expression is derived for the cooperative relaying system based on the characteristic function of the system’s probability density function (PDF) with only one relay. With the approximation of the outage probability expression, three optimization problems are built to minimize the outage probability under different constraints. We use the Lagrange method and Karush–Kuhn–Tucker (KKT) condition to solve the optimization problems to jointly optimize the relay’s PS factors and the transmit power. Numerical results show that our derived expression of the outage probability is accuracy and gives insights into the effect of various system parameters on the performance of protocols. Meanwhile, compared with the no optimal condition, our proposed optimization algorithms can all offer superior performance under different system constraints.

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“…Two widely adopted cooperative strategies in the wireless relay networks are regenerative (e.g., decode-and-forward (DF) [5]), and nonregenerative (e.g., amplify-and-forward (AF) [6]). Due to the independence of choosing modulation schemes at the source terminal and its easy implementation, a nonregenerative relaying strategy stands out as a promising alternative [7], [8], and is hence considered in this paper.…”

Section: Introductionmentioning

confidence: 99%

Relay selection strategies for SWIPT-enabled cooperative wireless systems

Gautam

Lagunas

Sharma

et al. 2017

2017 IEEE 28th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)

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Abstract-In this paper, we study a problem of relay selection in a two-hop relaying network where the destination is equipped with Simultaneous Wireless Information and Power Transmission (SWIPT) capabilities. In contrast to conventional cooperative networks, the destination node is considered to be capable of simultaneously decoding information and harvesting energy from both the source and the relay transmissions. In this context, we formulate two optimization problems for both time switching (TS) and power splitting (PS) based SWIPT schemes. The first problem is the maximization of the overall user data rate while ensuring a minimum harvested power. The second problem focuses on the maximization of the overall harvested power at the user under the constraint on the minimum achievable rate. Assuming an amplifyand-forward (AF) relay protocol, closed-form solutions are obtained for the selection of an optimal relay, relay amplification coefficient and the optimal time or power splitting factor. The performance of the proposed relay selection strategies with the aforementioned objectives is evaluated and compared with the case of random relay selection. Furthermore, the Rate-Energy (R-E) tradeoff performance of the scenario with both the direct and indirect relay-assisted links is compared to the case where only a relay-assisted link is available. Our simulation results demonstrate the significant benefits of combining direct and indirect links in SWIPT-enabled cooperative networks in terms of the R-E tradeoff.

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AF Relaying with Energy Harvesting Source and Relay

Cited by 36 publications

References 18 publications

Sequential Resource Distribution Technique for Multi-User OFDM-SWIPT Based Cooperative Networks

Sequential Resource Distribution Technique for Multi-User OFDM-SWIPT Based Cooperative Networks

Outage Analysis and Power Allocation Optimization for Multiple Energy-Harvesting Relay System Using SWIPT

Relay selection strategies for SWIPT-enabled cooperative wireless systems

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