Maximum likelihood algorithms for joint estimation of synchronisation impairments and channel in multiple input multiple output-orthogonal frequency division multiplexing system

Jose, Renu and Hari, KVS (2013) Maximum likelihood algorithms for joint estimation of synchronisation impairments and channel in multiple input multiple output-orthogonal frequency division multiplexing system. In: IET COMMUNICATIONS, 7 (15). pp. 1567-1579.

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Abstract

Maximum likelihood (ML) algorithms, for the joint estimation of synchronisation impairments and channel in multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) system, are investigated in this work. A system model that takes into account the effects of carrier frequency offset, sampling frequency offset, symbol timing error and channel impulse response is formulated. Cramer-Rao lower bounds for the estimation of continuous parameters are derived, which show the coupling effect among different impairments and the significance of the joint estimation. The authors propose an ML algorithm for the estimation of synchronisation impairments and channel together, using the grid search method. To reduce the complexity of the joint grid search in the ML algorithm, a modified ML (MML) algorithm with multiple one-dimensional searches is also proposed. Further, a stage-wise ML (SML) algorithm using existing algorithms, which estimate less number of parameters, is also proposed. Performance of the estimation algorithms is studied through numerical simulations and it is found that the proposed ML and MML algorithms exhibit better performance than SML algorithm.

Item Type:	Journal Article
Publication:	IET COMMUNICATIONS
Publisher:	INST ENGINEERING TECHNOLOGY-IET
Additional Information:	copyright for this article belongs to INST ENGINEERING TECHNOLOGY-IET
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	26 Nov 2013 15:17
Last Modified:	26 Nov 2013 15:17
URI:	http://eprints.iisc.ac.in/id/eprint/47789

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