MIMO frequency-selective channels with multiple frequency offsets: Estimation and detection techniques

S. Ahmed; S. Lambotharan; A. Jakobsson; J. A. Chambers

doi:10.1049/ip-com:20045224

MIMO frequency-selective channels with multiple frequency offsets: Estimation and detection techniques

S. Ahmed^*, S. Lambotharan, A. Jakobsson, J. A. Chambers

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

Channel gains and frequency offsets are estimated in a multiple input and multiple output (MIMO) scenario, allowing for more than one path between the transmit and the receive antennas, with each path possibly having a different frequency offset. Such a scenario may arise due to Doppler shift associated with various multipaths. Here, the general case is examined and an approximate maximum likelihood (AML) estimator is derived by exploiting the correlation property of the pilot signal. The AML estimator can be written as the sum of n_TL one-dimensional maximisations, where n_T is the number of transmit antennas and L is the total number of paths. The proposed estimator is validated by comparing the results with the Cramér-Rao lower bound (CRLB). Further, a minimum mean square error recursive (MMSER) equaliser is proposed for the considered scenario. Finally, the performance of the MMSER equaliser is compared with the equaliser not accounting for frequency offsets.

Original language	English (US)
Pages (from-to)	489-494
Number of pages	6
Journal	IEE Proceedings: Communications
Volume	152
Issue number	4
DOIs	https://doi.org/10.1049/ip-com:20045224
State	Published - Aug 2005
Externally published	Yes

ASJC Scopus subject areas

Electrical and Electronic Engineering

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10.1049/ip-com:20045224

Cite this

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abstract = "Channel gains and frequency offsets are estimated in a multiple input and multiple output (MIMO) scenario, allowing for more than one path between the transmit and the receive antennas, with each path possibly having a different frequency offset. Such a scenario may arise due to Doppler shift associated with various multipaths. Here, the general case is examined and an approximate maximum likelihood (AML) estimator is derived by exploiting the correlation property of the pilot signal. The AML estimator can be written as the sum of nTL one-dimensional maximisations, where nT is the number of transmit antennas and L is the total number of paths. The proposed estimator is validated by comparing the results with the Cram{\'e}r-Rao lower bound (CRLB). Further, a minimum mean square error recursive (MMSER) equaliser is proposed for the considered scenario. Finally, the performance of the MMSER equaliser is compared with the equaliser not accounting for frequency offsets.",

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AU - Ahmed, S.

AU - Lambotharan, S.

AU - Jakobsson, A.

AU - Chambers, J. A.

PY - 2005/8

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AB - Channel gains and frequency offsets are estimated in a multiple input and multiple output (MIMO) scenario, allowing for more than one path between the transmit and the receive antennas, with each path possibly having a different frequency offset. Such a scenario may arise due to Doppler shift associated with various multipaths. Here, the general case is examined and an approximate maximum likelihood (AML) estimator is derived by exploiting the correlation property of the pilot signal. The AML estimator can be written as the sum of nTL one-dimensional maximisations, where nT is the number of transmit antennas and L is the total number of paths. The proposed estimator is validated by comparing the results with the Cramér-Rao lower bound (CRLB). Further, a minimum mean square error recursive (MMSER) equaliser is proposed for the considered scenario. Finally, the performance of the MMSER equaliser is compared with the equaliser not accounting for frequency offsets.

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MIMO frequency-selective channels with multiple frequency offsets: Estimation and detection techniques

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