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Harmonic retrieval based baseband channel estimation for millimeter wave OFDM systems

Harmonic retrieval based baseband channel estimation for millimeter wave OFDM systems
Harmonic retrieval based baseband channel estimation for millimeter wave OFDM systems
For massive multi-input multi-output (MIMO) enhanced millimeter wave (mmWave) frequency-division multiplexing (OFDM) systems, channel estimation (CE) is challenging. in this paper, the baseband CE of mmWave based MIMO-OFDM systems after beam searching is formulated as a harmonic retrieval (HR) problem, where each path of the channel represents a harmonic with its frequency and strength to be estimated.We propose two methods, a windowed orthogonal matching pursuit (window-OMP) method and a windowed discrete Fourier transform (window-DFT) method, to approximately acquire the maximum likelihood (ML) estimate of the baseband CE. The window-OMP method is capable of approximating the ML estimator with high accuracy, while the window-DFT method has a lower complexity and is shown to acquire approximate ML estimate under the assumption that the frequencies of harmonics are sufficiently separated. Theoretical analysis is performed to derive a closed-form Cram´er–Rao lower bound as well as to investigate the effect of wrong paths to the estimation accuracy. A simulation study is conducted to investigate the performance of the proposed methods, and the results obtained verify that our methods outperform the existing estimation of signal parameters by rotational invariant techniques based HR method and the conventional interpolation method.
0018-9545
2668-2681
Sha, Ziyuan
5f4ce229-0c1e-44c0-b0e1-22a2c0b68cc7
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Sha, Ziyuan
5f4ce229-0c1e-44c0-b0e1-22a2c0b68cc7
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80

Sha, Ziyuan, Wang, Zhaocheng and Chen, Sheng (2019) Harmonic retrieval based baseband channel estimation for millimeter wave OFDM systems. IEEE Transactions on Vehicular Technology, 68 (3), 2668-2681. (doi:10.1109/TVT.2019.2895611).

Record type: Article

Abstract

For massive multi-input multi-output (MIMO) enhanced millimeter wave (mmWave) frequency-division multiplexing (OFDM) systems, channel estimation (CE) is challenging. in this paper, the baseband CE of mmWave based MIMO-OFDM systems after beam searching is formulated as a harmonic retrieval (HR) problem, where each path of the channel represents a harmonic with its frequency and strength to be estimated.We propose two methods, a windowed orthogonal matching pursuit (window-OMP) method and a windowed discrete Fourier transform (window-DFT) method, to approximately acquire the maximum likelihood (ML) estimate of the baseband CE. The window-OMP method is capable of approximating the ML estimator with high accuracy, while the window-DFT method has a lower complexity and is shown to acquire approximate ML estimate under the assumption that the frequencies of harmonics are sufficiently separated. Theoretical analysis is performed to derive a closed-form Cram´er–Rao lower bound as well as to investigate the effect of wrong paths to the estimation accuracy. A simulation study is conducted to investigate the performance of the proposed methods, and the results obtained verify that our methods outperform the existing estimation of signal parameters by rotational invariant techniques based HR method and the conventional interpolation method.

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Accepted/In Press date: 23 January 2019
e-pub ahead of print date: 28 January 2019
Published date: 14 March 2019

Identifiers

Local EPrints ID: 429260
URI: http://eprints.soton.ac.uk/id/eprint/429260
ISSN: 0018-9545
PURE UUID: f805b228-9cc2-40d1-9f08-5332cc2b7701

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Date deposited: 25 Mar 2019 17:30
Last modified: 16 Mar 2024 00:55

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Contributors

Author: Ziyuan Sha
Author: Zhaocheng Wang
Author: Sheng Chen

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