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Adaptive MMSE-based Precoding in Multiuser MIMO Broadcasting with Application to Cognitive Radio

机译：多用户MIMO广播中基于MMSE的自适应预编码及其在认知无线电中的应用

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Since cognitive radio (CR) in conjunction with non-orthogonal multiple access is a candidate techniques for future mobile radio networks, realizing underlay spectrum sharing with high capacity gain is an important issue. In this paper, we propose an adaptive linear precoder design for a CR based multiuser MIMO broadcasting system. The proposed adaptive precoder employs regularized channel inversion based on the minimum mean square error criterion (MMSE). Unlike the conventional MMSE based precoder, the proposed adaptive MMSE based precoding approach develops a new kind of diversity, so-called "precoding diversity" which considerably improves the signal-to-interference-plus-noise (SINR) ratio at the receiver of each cognitive user (CU) while fulfilling the interference constraint at the primary user (PU). Simulation results illustrate that the proposed adaptive MMSE based precoder can achieve good SNR and spectral efficiency gains outperforming the state-of-the-art.
机译：由于认知无线电（CR）结合非正交多址访问是未来移动无线电网络的候选技术，因此，实现具有高容量增益的底层频谱共享是一个重要的问题。在本文中，我们提出了一种基于CR的多用户MIMO广播系统的自适应线性预编码器设计。所提出的自适应预编码器采用基于最小均方误差准则（MMSE）的正则化信道反演。与传统的基于MMSE的预编码器不同，所提出的基于自适应MMSE的预编码方法开发了一种新的分集，即所谓的“预编码分集”，该分集大大提高了每个接收器的信噪比（SINR）认知用户（CU），同时满足主要用户（PU）的干扰约束。仿真结果表明，所提出的基于自适应MMSE的预编码器可以实现良好的SNR，并且频谱效率增益优于最新技术。

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