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.
QIAN Cheng* (钱成), ZHANG Meng (张萌), LUO Han-wen (罗汉文), LIU Wei (刘伟)
. Joint Tomlinson-Harashima Source and Linear Relay Precoder Design in Amplify-and-Forward Multiple-Input Multiple-Output Two-Way Relay Systems[J]. Journal of Shanghai Jiaotong University(Science), 2013
, 18(2)
: 180
-185
.
DOI: 10.1007/s12204-013-1381-6
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