| Summary: | 碩士 === 國立中正大學 === 通訊工程研究所 === 100 === In multiuser multiple-input-multiple-output (MU-MIMO) downlink communications, precoder design plays an important role in eliminating the co-channel interference (CCI) among the mobile users. In this thesis, we focus on the technique of block-diagonalization (BD) and propose several new transceiver design approaches.
In the first part of the thesis, several new BD transceiver designs are investigated. The technique of BD is first applied to decouple the MU-MIMO system into multiple parallel point-to-point MIMO sub-systems.Each equivalent point-to-point MIMO sub-system is then designed by the minimum error rate criterion. Three different transceiver architectures have been considered in this thesis. They are the MU-MIMO BD zero-forcing linear precoding scheme, the MU-MIMO BD with decision feedback equalization, and MU-MIMO BD Tomlinson-Harashima precoding scheme.
In the second part of the thesis, we investigate a new transceiver design which applies the technique of lattice-reduction (LR) into the BD-GMD (block-diagonal geometric-mean-decomposition) transceiver design. In order to further reduce the computational complexity of LR, we also apply the recently proposed partial-lattice-reduction (PLR) into the transceiver design. We also propose three block selection schemes for PLR, which can attain different performance-complexity trade-off. The error rate performance of the proposed designs has been verified by extensive computer simulations.
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