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Wideband beamspace channel estimation for millimeter-wave MIMO systems relying on lens antenna arrays

Wideband beamspace channel estimation for millimeter-wave MIMO systems relying on lens antenna arrays
Wideband beamspace channel estimation for millimeter-wave MIMO systems relying on lens antenna arrays
Beamspace channel estimation is indispensable for millimeter-wave (mmWave) MIMO systems relying on lens antenna arrays for achieving substantially increased data rates, despite using a small number of radio-frequency (RF) chains. However, most of the existing beamspace channel estimation schemes have been designed for narrowband systems, while the rather scarce wideband solutions tend to assume that the sparse beamspace channel exhibits a common support in the frequency domain, which has a limited validity owing to the effect of beam squint caused by the wide bandwidth in practice. In this paper, we investigate the wideband beamspace channel estimation problem without the common support assumption. Specifically, by exploiting the effect of beam squint, we first prove that each path component of the wideband beamspace channel exhibits a unique frequency-dependent sparse structure. Inspired by this structure, we then propose a successive support detection (SSD)-based beamspace channel estimation scheme, which successively estimates all the sparse path components following the classical idea of successive interference cancellation (SIC). For each path component, its support at different frequencies is jointly estimated to improve the accuracy by utilizing the proved sparse structure, and its influence is removed to estimate the remaining path components. The performance analysis shows that the proposed SSD-based scheme can accurately estimate the wideband beamspace channel at a low complexity. Simulation results verify that the proposed SSD-based scheme enjoys a reduced pilot overhead, and yet achieves an improved channel estimation accuracy.
1053-587X
4809-4824
Gao, Xinyu
49d41125-a198-493e-b310-8513c9e31607
Dai, Linglong
a3b9a8e1-777f-4196-a388-969444c7239d
Zhou, Shidong
d5e0defe-258f-4d1a-982d-819c3ef59c02
Sayeed, Akbar M.
7562530e-b1e2-4afe-b801-2d8d865c9480
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Gao, Xinyu
49d41125-a198-493e-b310-8513c9e31607
Dai, Linglong
a3b9a8e1-777f-4196-a388-969444c7239d
Zhou, Shidong
d5e0defe-258f-4d1a-982d-819c3ef59c02
Sayeed, Akbar M.
7562530e-b1e2-4afe-b801-2d8d865c9480
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Gao, Xinyu, Dai, Linglong, Zhou, Shidong, Sayeed, Akbar M. and Hanzo, Lajos (2019) Wideband beamspace channel estimation for millimeter-wave MIMO systems relying on lens antenna arrays. IEEE Transactions on Signal Processing, 4809-4824. (doi:10.1109/TSP.2019.2931202).

Record type: Article

Abstract

Beamspace channel estimation is indispensable for millimeter-wave (mmWave) MIMO systems relying on lens antenna arrays for achieving substantially increased data rates, despite using a small number of radio-frequency (RF) chains. However, most of the existing beamspace channel estimation schemes have been designed for narrowband systems, while the rather scarce wideband solutions tend to assume that the sparse beamspace channel exhibits a common support in the frequency domain, which has a limited validity owing to the effect of beam squint caused by the wide bandwidth in practice. In this paper, we investigate the wideband beamspace channel estimation problem without the common support assumption. Specifically, by exploiting the effect of beam squint, we first prove that each path component of the wideband beamspace channel exhibits a unique frequency-dependent sparse structure. Inspired by this structure, we then propose a successive support detection (SSD)-based beamspace channel estimation scheme, which successively estimates all the sparse path components following the classical idea of successive interference cancellation (SIC). For each path component, its support at different frequencies is jointly estimated to improve the accuracy by utilizing the proved sparse structure, and its influence is removed to estimate the remaining path components. The performance analysis shows that the proposed SSD-based scheme can accurately estimate the wideband beamspace channel at a low complexity. Simulation results verify that the proposed SSD-based scheme enjoys a reduced pilot overhead, and yet achieves an improved channel estimation accuracy.

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wideband mmWave MIMO - Accepted Manuscript
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Accepted/In Press date: 5 July 2019
e-pub ahead of print date: 26 July 2019

Identifiers

Local EPrints ID: 432396
URI: http://eprints.soton.ac.uk/id/eprint/432396
ISSN: 1053-587X
PURE UUID: 99a3f022-5164-4586-ad54-9f29bdfd4737
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 12 Jul 2019 16:30
Last modified: 18 Mar 2024 05:14

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Contributors

Author: Xinyu Gao
Author: Linglong Dai
Author: Shidong Zhou
Author: Akbar M. Sayeed
Author: Lajos Hanzo ORCID iD

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