论文标题

在PA非线性下对MM波大量MIMO杂种杂交的全面性能分析

A Comprehensive Performance Analysis for mm-Wave Massive MIMO Hybrid Beamforming under PA Nonlinearities

论文作者

Salman, Murat Babek, Guvensen, Gokhan Muzaffer

论文摘要

在本文中,我们开发了一个框架,以研究针对功率放大器(PA)非线性损害的大量多重输入多重输出(MIMO)系统的不同混合波束形成架构的性能。在数字前(DPD)设计中采用了基于反馈后反馈的间接学习体系结构,以补偿由PA引起的非线性失真。此外,我们为基于广义的特征面积(GEB)方法的部分连接的结构提出了一种新型的模拟波束设计。在文献中,研究了非线性PA对带外辐射(OOB)辐射的影响,并实现了信噪比互联网加上噪声比率(SINR)。但是,这些研究限制了完全数字或部分连接的混合边界架构,同时以PA为基础部署Bussgang分解,而无需考虑性能分析中的阵列体系结构类型。在这项研究中,我们得出了基于矩阵形式的时空bussgang分解分解的分析比特率(BER)表达,并通过广义互信息(GMI)在PA非线性下通过普遍的共同信息(GMI)获得了不匹配的解码能力,用于不同的混合大型MIMO架构。分析结果表明,非线性失真会显着影响系统性能,而DPD可以将这些影响降低到某种程度上。最后,通过数值结果验证获得的分析BER表达。

In this paper, we develop a framework to investigate the performances of different hybrid beamforming architectures for massive multiple input multiple output (MIMO) systems impaired by power amplifier (PA) nonlinearities. Indirect learning architecture based on feedback after anti-beamforming is adopted in design of digital pre-distortion (DPD) in order to compensate the nonlinear distortion caused by PA. In addition, we propose a novel analog beamformer design for partially connected architecture based on generalized eigen-beamformer (GEB) approach. In literature, the effects of nonlinear PA's on the out-of-band (OOB) radiation and achieved signal-to-interfence-plus-noise ratio (SINR) are investigated. However, these studies are limitted to fully digital or partially connected hybrid beamforming architectures while deploying Bussgang decompostion on a PA basis without considering the array architecture type in performance analysis. In this study, we derived an analytical bit-error-rate (BER) expression based on spatio-temporal Bussgang decompostion in matrix form, and mismatched decoding capacity via Generalized Mutual Information (GMI) is obtained under PA nonlinearity for different hybrid Massive MIMO architectures. Analytical results show that the nonlinear distortion significantly affects the system performance, and DPD can reduce these effects to some extend. Finally, obtained analytical BER expression is verified via numerical results.

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