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Sum rate maximization for multi-pair two-way relaying with single-antenna amplify and forward relays | IEEE Conference Publication | IEEE Xplore

Sum rate maximization for multi-pair two-way relaying with single-antenna amplify and forward relays


Abstract:

We consider a multi-pair two-way relay network with multiple single antenna amplify-and-forward relays. The sum rate maximization problem subject to a total transmit powe...Show More

Abstract:

We consider a multi-pair two-way relay network with multiple single antenna amplify-and-forward relays. The sum rate maximization problem subject to a total transmit power constraint is studied for such network. The optimization problem is non-convex. First, we show that the problem is a monotonic optimization problem and propose a polyblock approximation algorithm for obtaining the global optimum. However, this algorithm is only suitable for benchmarking because of its high computational complexity. After observing that the necessary optimality condition for our problem is similar to that of the generalized eigenvalue problem, we propose to use the generalized power iterative algorithm which can approach the global optimum recursively. Finally, we propose the total signal-to-interference-plus-noise ratio (SINR) eigen-beamformer which is a closed-form suboptimal solution that reduces the computational complexity significantly. Simulation results show that the proposed algorithms outperform the existing scheme. Moreover, the total SINR eigen-beamformer almost achieves the performance of the optimal solution.
Date of Conference: 25-30 March 2012
Date Added to IEEE Xplore: 30 August 2012
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ISSN Information:

Conference Location: Kyoto, Japan

1. INTRODUCTION

Relay networks are important for future mobile networks since they can improve the network performance by extending the coverage and increasing the network capacity. In contrast to one-way relaying, two-way relaying techniques can compensate the spectral efficiency loss due to the half-duplex constraint of the relay and, therefore, use the radio resources in a more efficient manner. The optimal beam-forming design for the sum rate maximization in two-way amplify and forward (AF) relay networks with one pair of users has been studied in [1] and [2]. Only a few references deal with multi-pair two-way AF relay networks, which include adaptive power allocation [3] and distributed beamforming [4]. Moreover, the optimum beamforming design for maximizing the sum rate of this system has not been studied prior to our work.

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