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Phase-Noise Compensation for OFDM Systems Exploiting Coherence Bandwidth Modeling Algorithms and Analysis

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Document pages: 15 pages

Abstract: Phase-noise (PN) estimation and compensation are crucial in millimeter-wave(mmWave) communication systems to achieve high reliability. The PN estimation,however, suffers from high computational complexity due to its fundamentalcharacteristics, such as spectral spreading and fast-varying fluctuations. Inthis paper, we propose a new framework for low-complexity PN compensation inorthogonal frequency-division multiplexing systems. The proposed framework alsoincludes a pilot allocation strategy to minimize its overhead. The key ideasare to exploit the coherence bandwidth of mmWave systems and to approximate theactual PN spectrum with its dominant components, resulting in a non-iterativesolution by using linear minimum mean squared-error estimation. The proposedmethod obtains a reduction of more than 2.5 times in total complexity, ascompared to the existing methods. Furthermore, we derive closed-formexpressions for normalized mean squared-errors (NMSEs) as a function ofcritical system parameters, which help in understanding the NMSE behavior inlow and high signal-to-noise ratio regimes.

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