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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.
Original language | English |
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Pages (from-to) | 8242-8255 |
Number of pages | 14 |
Journal | IEEE Transactions on Communications |
Volume | 69 |
Issue number | 12 |
Early online date | 2021 |
DOIs | |
Publication status | Published - 1 Dec 2021 |
MoE publication type | A1 Journal article-refereed |
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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Dive into the research topics of 'Impact of Pilot Overhead and Channel Estimation on the Performance of Massive MIMO'. Together they form a unique fingerprint.Projects
- 1 Finished
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MASSIVE AND SPARSE ANTENNA ARRAY PROCESSING FOR MILLIMETERWAVE COMMUNICATIONS
Vorobyov, S. (Principal investigator)
01/01/2019 → 31/12/2021
Project: Academy of Finland: Other research funding