A Closed-Form Expression of Optimal Time for Two-Way Relay Using DF MABC Protocol

Shim, Yeonggyu; Park, Hyuncheol

doi:10.1109/lcomm.2014.022514.132755

Cited by 12 publications

(15 citation statements)

References 7 publications

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“…In addition, the studies focus on the achievable performance when the SWIPT methods are introduced to the TWR protocols [23], although the traditional TWR protocols without energy harvesting are studied in various aspects from performance analysis to the resource allocation [30][31][32][33]. To leverage the performance at the given resources, resource allocation methods are essential.…”

Section: Motivation and Contributionmentioning

confidence: 99%

“…In the BC phase, the relay transmits the network coded symbol vector x bc [30,33] of the decoded messagesŵ 1 andŵ 2 by consuming the energy harvested in the MAC phase. This paper does not take into account the energy consumption in the decoding process so that the transmit power of the relay is given by…”

Section: System Modelmentioning

confidence: 99%

“…The problem (28)- (31) has the linear objective function (28), linear constraints (29) and (31), and convex constraint (30). The convexity of (30) is guaranteed since the LHS is linear and the RHS is concave with the perspective of a concave function [35].…”

Section: Resource Allocation For the Ts-swiptmentioning

confidence: 99%

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Rate Optimization of Two-Way Relaying with Wireless Information and Power Transfer

2017

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Abstract:We consider the simultaneous wireless information and power transfer in two-phase decode-and-forward two-way relaying networks, where a relay harvests the energy from the signal to be relayed through either power splitting or time splitting. Here, we formulate the resource allocation problems optimizing the time-phase and signal splitting ratios to maximize the sum rate of the two communicating devices. The joint optimization problems are shown to be convex for both the power splitting and time splitting approaches after some transformation if required to be solvable with an existing solver. To lower the computational complexity, we also present the suboptimal methods optimizing the splitting ratio for the fixed time-phase and derive a closed-form solution for the suboptimal method based on the power splitting. The results demonstrate that the power splitting approaches outperform their time splitting counterparts and the suboptimal power splitting approach provides a performance close to the optimal one while reducing the complexity significantly.

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Section: Motivation and Contributionmentioning

confidence: 99%

Section: System Modelmentioning

confidence: 99%

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Rate Optimization of Two-Way Relaying with Wireless Information and Power Transfer

2017

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“…Cooperative communication has recently received much attention as a method to improve network performance [1][2][3][4][5][6][7][8][9][10][11]. In multi-hop cooperative communications, the source transmits signal to relays that forward signals to the destination or other relays.…”

Section: Introductionmentioning

confidence: 99%

Optimal Power Allocation with Hybrid Relaying Based on the Channel Condition

2018

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This paper considers a hybrid relay network consisting of the source, the amplify-and-forward (AF) relay, the decode-and-forward (DF) relay, and the destination. In hybrid three-hop relay systems, the transmitted signal from source can be received at the destination after processing the signals through two relays. If the first relay amplifies and forwards the received signal, and the second relay decodes and forwards the received signal, the system model is considered to be an AF-DF relay system. The reverse case is considered for the DF-AF relay system. The AF-DF and DF-AF relay systems have different error rates and achievable throughput with respect to the channel conditions between two nodes. We propose optimal power allocation schemes for two different relays in order to maximize the achievable rate under a sum relay power constraint for given channel gains and transmit power from the source. By solving the optimization problem to maximize the achievable rate for each relay network, the transmit power values in closed form are derived. When the channel gains are the same, the optimal power allocation scheme for the AF-DF relay network proves that greater power should be allocated at the first relay to maximize the achievable rate. In the case of the DF-AF relay network, we derive an optimal power allocation scheme for the four possible cases. Under the same signal-to-noise ratio (SNR) condition, at the first hop we show that the achievable rate of the AF-DF relay network is greater than that of the DF-AF relay network when the channel gain between two relays is greater than that between the second relay and destination. Simulation results show that the proposed power allocation schemes provide a higher achievable rate than the equal power allocation scheme and the grid search schemes.

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“…Cooperative comunication has recently attracted method to improve the performace [1][2][3][4][5][6][7]. In multi-hop cooperative communications, the source transmits signal to relays that forward signal to the destination or other relays.…”

Section: Introductionmentioning

confidence: 99%

The Optimal Power Allocation with Hybrid Relaying Based on Channel Condition

Jeon¹,

Shim²,

Park³

2018

Preprint

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This paper considers a hybrid relay network consisting of the source, the amplify-and-forward (AF) relay, the decode-and-forward (DF) relay, and the destination. We propose the optimal power allocation schemes between two different relays which maximize the achievable rate under a sum relay power constraint for given channel gains and transmit power from source. By solving the optimization problem to maximize the achievable rate for each relay network, the 5 transmit power values in closed-form are derived. When the channel gains are the same, the optimal power allocation scheme for AF-DF relay network proves that a more power should be allocated at the first relay to maximize the achievable rate. In case of the DF-AF relay network, we derive the optimal power allocation scheme for the possible four cases. Under the same SNR condition at the first hop, we show that the achievable rate of AF-DF relay network is greater than that of DF-AF relay 10 network when the channel gain between two relays is higher than that between the second relay and destination. Simulation results show that the proposed power allocation schemes provide a higher achievable rate than the equal power allocation schemes.

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A Closed-Form Expression of Optimal Time for Two-Way Relay Using DF MABC Protocol

Cited by 12 publications

References 7 publications

Rate Optimization of Two-Way Relaying with Wireless Information and Power Transfer

Rate Optimization of Two-Way Relaying with Wireless Information and Power Transfer

Optimal Power Allocation with Hybrid Relaying Based on the Channel Condition

The Optimal Power Allocation with Hybrid Relaying Based on Channel Condition

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