Iterative Beamformer Design for Multi-Node MIMO Two-Way Relay Networks Using Duality

作者：Choi Won Chul^*; Park Dong Jo

来源：IEEE Transactions on Vehicular Technology, 2016, 65(8): 6742-6747.

DOI：10.1109/TVT.2015.2478846

• Amplify-and-forward two-way relay network
• beamformer design
• mean-square-error (MSE) duality
• multinode
• multiple-input multiple-output (MIMO)

In this paper, an iterative design method for beamformers is proposed for multiple-input multiple-output (MIMO) two-way relay networks with multiple pairs of source nodes. It is known that the joint beamformer design problem based on the minimum mean-square-error (MMSE) is known to be nonconvex, and it cannot be analytically solved. To manage this difficulty, a novel iterative algorithm is proposed, which uses duality relationships. First, the MSE duality for MIMO two-way relay networks with multiple pairs of nodes is presented. Moreover, the optimization problem is divided into three subproblems, which can be separately solved; then, the duality is applied to the proposed iterative algorithm, which provides closed-form solutions for all subproblems. The numerical results demonstrate that the proposed method improves network performance and can be applied to various communication systems that use the two-way relay network.

• 出版日期2016-8