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Impact of Pilot Overhead and Channel Estimation on the Performance of Massive MIMO

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2021-12-01

Department

Department of Signal Processing and Acoustics

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Mcode

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Language

en

Pages

14

Series

IEEE Transactions on Communications, Volume 69, issue 12, pp. 8242-8255

Abstract

This paper studies the impact of additional pilot overhead for covariance matrix estimation in a time-division duplexed (TDD) massive multiple-input multiple-output (MIMO) system. We choose average uplink (UL) and downlink (DL) spectral efficiencies (SEs) as performance metrics for the massive MIMO system, and derive closed form expressions for them in terms of the additional pilot overhead. The expressions are derived by considering linear minimum mean squared error (LMMSE)-type and element-wise LMMSE-type channel estimates that represent LMMSE and element-wise LMMSE with estimated covariance matrices, respectively. Using these expressions, a detailed theoretical analysis of SE behavior as a function of pilot overhead for both LMMSE-type and element-wise LMMSE-type channel estimation are presented, followed by simulations, which also demonstrate and validate theoretical results.

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Keywords

Channel estimation, channel estimation, Coherence, Contamination, covariance estimation, Covariance matrices, Estimation, Massive MIMO, massive multiple-input multiple-output (MIMO), Measurement, pilot contamination, Spectral efficiency

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DOI

10.1109/TCOMM.2021.3112213

Citation

Kocharlakota, A K, Upadhya, K & Vorobyov, S A 2021, 'Impact of Pilot Overhead and Channel Estimation on the Performance of Massive MIMO', IEEE Transactions on Communications, vol. 69, no. 12, pp. 8242-8255. https://doi.org/10.1109/TCOMM.2021.3112213

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https://urn.fi/URN:NBN:fi:aalto-202201121170

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[article-cris] Sähkötekniikan korkeakoulu / ELEC

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