Joint Tomlinson-Harashima source and linear relay precoder design in amplify-and-forward multiple-input multiple-output two-way relay systems |
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Authors: | QIAN Cheng ZHANG Meng LUO Han-wen LIU Wei |
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Affiliation: | Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai 200240, China |
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Abstract: | Existing minimum-mean-squared-error (MMSE) transceiver designs in amplified-and-forward (AF) multiple-input multiple-output (MIMO) two-way relay systems all assume a linear precoder at the sources. Nonlinear source precoders in such a system have not been considered yet. In this paper, we study the joint design of source Tomlinson-Harashima precoders (THPs), relay linear precoder and MMSE receivers in two-way relay systems. This joint design problem is a highly nonconvex optimization problem. By dividing the original problem into three sub-problems, we propose an iterative algorithm to optimize precoders and receivers. The convergence of the algorithm is ensured since the updated solution is optimal to each sub-problem. Numerical simulation results show that the proposed iterative algorithm outperforms other algorithms in the high signal-to-noise ratio (SNR) region. |
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Keywords: | multiple-input multiple-output (MIMO) two-way relay Tomlinson-Harashima precoding minimum-mean-square-error (MMSE) |
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