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A Constellation Scaling Approach to Vector Perturbation for Adaptive Modulation in MU-MIMO

机译:MU-MIMO中星座调制的矢量摄动自适应调制方法

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摘要

It is known that vector perturbation (VP) precoding does not apply to the case where users employ different modulations, while existing solutions for this scenario are suboptimal. In this letter, a joint vector perturbation precoding algorithm is proposed for multiuser MIMO (MU-MIMO) downlink system in the adaptive modulation scenario where different users apply different modulation types. Compared with conventional block diagonalized vector perturbation (BD-VP) and user grouping VP where the search dimension of the perturbation vector is reduced, the proposed algorithm keeps the search dimension unchanged by applying a simple transformation to the VP operation. Our analysis and results show that the proposed algorithm provides an applicable VP solution to the adaptive modulation scenario, with optimal VP performance.
机译:众所周知,矢量扰动(VP)预编码不适用于用户采用不同调制方式的情况,而针对这种情况的现有解决方案并不理想。在这封信中,针对不同用户应用不同调制类型的自适应调制场景中的多用户MIMO(MU-MIMO)下行链路系统,提出了一种联合矢量摄动预编码算法。与传统的块对角矢量扰动(BD-VP)和用户分组VP(其中扰动矢量的搜索维数减小了)相比,该算法通过对VP操作进行简单变换,使搜索维数保持不变。我们的分析和结果表明,所提出的算法为自适应调制方案提供了适用的VP解决方案,具有最佳的VP性能。

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