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

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Document pages: 30 pages

Abstract: In this paper, we develop a framework to investigate the performances ofdifferent hybrid beamforming architectures for massive multiple input multipleoutput (MIMO) systems impaired by power amplifier (PA) nonlinearities. Indirectlearning architecture based on feedback after anti-beamforming is adopted indesign of digital pre-distortion (DPD) in order to compensate the nonlineardistortion caused by PA. In addition, we propose a novel analog beamformerdesign for partially connected architecture based on generalizedeigen-beamformer (GEB) approach. In literature, the effects of nonlinear PA son the out-of-band (OOB) radiation and achieved signal-to-interfence-plus-noiseratio (SINR) are investigated. However, these studies are limitted to fullydigital or partially connected hybrid beamforming architectures while deployingBussgang decompostion on a PA basis without considering the array architecturetype in performance analysis. In this study, we derived an analyticalbit-error-rate (BER) expression based on spatio-temporal Bussgang decompostionin matrix form, and mismatched decoding capacity via Generalized MutualInformation (GMI) is obtained under PA nonlinearity for different hybridMassive MIMO architectures. Analytical results show that the nonlineardistortion significantly affects the system performance, and DPD can reducethese effects to some extend. Finally, obtained analytical BER expression isverified via numerical results.

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