Energy-efficient design for combined relay selection and power allocation AF-relay network

2014 ◽  
Author(s):  
Muhammad I. Khalil ◽  
Stevan. M. Berber ◽  
Kevin W. Sowerby
Keyword(s):  
Power Allocation ◽  
Energy Efficient ◽  
Relay Selection ◽  
Relay Network ◽  
Efficient Design ◽  
Energy Efficient Design ◽  
Af Relay

Energy-Efficient Joint Power Allocation and Relay Selection in Bit Error Rate Constrained Two-Way Relay Network

2015 ◽  
Vol 7 (4) ◽  
pp. 1-14
Author(s):  
Rashi Mehrotra ◽  
Ranjan Bose
Keyword(s):  
Power Consumption ◽  
Power Allocation ◽  
Bit Error Rate ◽  
Error Rate ◽  
Energy Efficient ◽  
Relay Selection ◽  
Relay Network ◽  
Transmit Power ◽  
Selection Scheme ◽  
Simulation Results

In this paper, the authors have proposed energy efficient power allocation and relay selection scheme in a two-way amplify-and-forward (AF) relay under bit error rate (BER) constrained network. They have derived an expression for the overall BER for Rayleigh fading channel. Based on minimum power consumption in the network, the authors have addressed the problem of power allocation by converting geometric programming to a convex optimization problem. A closed form solution of power allocation is found, which aims at minimizing total transmit power for the overall BER constrained network. The authors have evaluated minimum total transmit power for two-way AF relay network. Based on minimum total transmit power, a novel relay selection scheme has been proposed. Simulation results demonstrate that the proposed two-way power allocation and relay selection scheme can significantly minimize power consumption under BER constrained network as compared to the existing relay transmission. The proposed power allocation scheme gives 3 dBW gain than one-way relay transmission. The proposed relay selection method also outperforms the random relay selection by 24 dBW. The simulation results are corroborated with the analytical result

scholarly journals Energy Efficient Design for Two-Way AF Relay Networks

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Yong Li ◽  
Zhengguang Zheng ◽  
Mingyue Zhao ◽  
Yunli Chen ◽  
Chuanyong Liu
Keyword(s):  
Power Allocation ◽  
Energy Efficient ◽  
Relay Node ◽  
Relay Networks ◽  
Efficient Design ◽  
Amplify And Forward ◽  
Iterative Search ◽  
Suboptimal Solution ◽  
Af Relay ◽  
Efficient Power

Conventional designs on two-way relay networks mainly focus on the spectral efficiency (SE) rather than energy efficiency (EE). In this paper, we consider a system where two source nodes communicate with each other via an amplify-and-forward (AF) relay node and study the power allocation schemes to maximize EE while ensuring a certain data rate. We propose an optimal energy-efficient power allocation algorithm based on iterative search technique. In addition, a closed-form suboptimal solution is derived with reduced complexity and negligible performance degradation. Numerical results show that the proposed schemes can achieve considerable EE improvement compared with conventional designs.

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