Matrix Unimodular Precoder Interpolation for MIMO-OFDM Wireless Communication Systems

Unitary precoding is an essential step in multiple-input multiple-output (MIMO) wireless systems. For wideband systems that employ OFDM, precoders are typically fed back for a few subcarriers and interpolated in the frequency domain. This does not scale well for wideband (5G/6G) systems since feedba...

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Bibliographic Details
Published in:IEEE communications letters Vol. 27; no. 11; pp. 3038 - 3042
Main Authors: Mehta, Parth, Appaiah, Kumar, Velmurugan, Rajbabu, Pal, Debasattam
Format: Journal Article
Language:English
Published: New York IEEE 01.11.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Broadband
Filter design (mathematics)
Interpolation
matrix all-pass
MIMO communication
Orthogonal Frequency Division Multiplexing
Precoding
Time-domain analysis
Transmitters
Wideband
Wireless communication
Wireless communication systems
ISSN:1089-7798, 1558-2558
Online Access:Get full text
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Summary:Unitary precoding is an essential step in multiple-input multiple-output (MIMO) wireless systems. For wideband systems that employ OFDM, precoders are typically fed back for a few subcarriers and interpolated in the frequency domain. This does not scale well for wideband (5G/6G) systems since feedback requirements become prohibitive for large bandwidths. Often, these systems possess dominant line-of-sight components with compact channel representations in the time-domain. In this letter, we propose Unimodular interpolation based filter design to compactly represent precoders as realisable matrix all-pass filters. Simulations confirm the effectiveness of the proposed approach over past approaches in terms of achievable rate.
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ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2023.3317450