Distributed Precoding Design in Multi-cell Multi-user MIMO Network based on Leakage Zero Forcing Block Diagonalization
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摘要: 该文对多小区MU-MIMO中的预编码设计进行了研究。通过将单小区块对角化预编码进行扩展，将泄漏到邻小区的干扰纳入考虑范围，采用泄露干扰迫零的块对角化预编码，利用发送端提供的额外自由度直接将泄露干扰进行子空间迫零，消除泄露干扰，并且小区内用户之间也进行子空间迫零，消除用户间干扰；从而降低小区间干扰对多用户MIMO系统的不利影响。并且对本文所提算法复杂度进行了定量分析，表明该方案具有较低的计算复杂度。最后通过仿真全面分析了不同参数条件下的系统性能，结果显示该方法能够提高系统的传输速率。Abstract: This paper considers an optimal precoding design for multi-cell multi-user multiple input multiple output (MIMO) networks. It is proposed to expand block diagonalization method of single cell into multicell scenario. Considering the interference leakage to the out-of-cell users, it is proposed to use Leakage Zero Forcing Block Diagonalization method to design the precoding, in which using the extra space freedom degree offered by transmitting side, subspaces spanned by interference channels and other intra-cell users channels are zero-forced. The interference leakage can be suppressed proactively and the intra-cell users interference can be eliminated by the base station (BS), so that the negative factors of the inter-cell interference for the multi-user MIMO system can be decreased. Moreover, the proposed algorithm complexity quantitative analysis shows that the scheme has low computational complexity. Finally, Numerical and simulation results show that this method can greatly improve the transmission rate through a comprehensive simulation analysis of the system performance under different conditions.
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