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MMSE based joint Tomlinson-Harashima source and linear relay precoder design in non-regenerative MIMO relay system
Authors:LI Nan    CHEN Peng    HE Zhi-qiang    LIN Jia-ru
Affiliation:Key Lab of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China
Abstract:This paper proposes a joint nonlinear transceiver design scheme based on minimum mean square error(MMSE) criterion for non-regenerative multiple input multiple output(MIMO) relay system.The proposed scheme decomposes the error covariance matrix,reformulates the original joint design problem as two separate optimization problems,and then provides a closed-form solution with only local channel state information(CSI) available at the source and destination.Performance evaluation shows that the proposed scheme significantly outperforms linear schemes,and has a competitive performance compared with existing global CSI based nonlinear schemes,both iterative and non-iterative.
Keywords:MIMO   non-regenerative relay   joint transceiver design   Tomlinson-Harashima precoding (THP)   MMSE
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