一种低复杂度的多用户MIMO THP排序算法

Abstract

Abstract:

The nonlinear Tomlinson-Harashima precoding(THP) algorithm is an effective solution for MIMO broadcast. However, the performance of the THP strongly depends on the ordering of precoding symbols. To compare different ordering THP algorithms effectively, an ordering gain factor is defined in this paper. And we propose a low complexity ordering THP algorithm based on the approximate equal-diagonal QR decomposition. The proposed algorithm obtains a triangle matrix with approximate equal diagonal elements by rearranging the order of the channel matrix's rows to maximize the ordering gain. Simulation results reveal that the proposed algorithm has a significant reduction of computational complexity at the expense of only slight performance degradation compared to the optimal ordering THP algorithm.

Key words: multiuser, multiple input multiple output, downlink, Tomlinson-Harashima precoding

CLC Number:

TN929.5

WANG Wei;HU Mei-xia;ZHANG Hai-lin. Low complexity ordering algorithm for multiuser MIMO Tomlinson-Harashima precoding[J].J4, 2009, 36(4): 596-601.

References

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Low complexity ordering algorithm for multiuser MIMO Tomlinson-Harashima precoding

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