Phase-impairment effects and compensation algorithms for OFDM systems

Nikitopoulos, K and Polydoros, A (2005) Phase-impairment effects and compensation algorithms for OFDM systems IEEE Transactions on Communications, 53 (4). pp. 698-707.

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Abstract

The simultaneous perturbation of an orthogonal frequency-division multiplexing receiver by phase noise plus a residual frequency offset (due to synchronization errors) is modeled here as a combined phase impairment, whose effect is evaluated analytically for the case of a frequency-selective fading channel. A nonpilot-aided (decision-directed) scheme is proposed, which compensates for the common (over all the subcarriers) phase-impairment effect. By representing the resulting intercarrier interference as an uncorrelated, unequal-variance process in the frequency domain, maximum-likelihood (ML) and approximate ML estimators of the complex-vector and phase-only types are derived and analytically evaluated. The present schemes are also compared with other current methods based on individual phase trackers, one per subcarrier. Finally, two suggestions are introduced for increasing the robustness of the algorithms to tentative-decision errors. It is demonstrated through simulations that the analysis is accurate, and that the proposed schemes achieve error-rate performance close to that of ideal compensation. © 2005 IEEE.

Item Type:	Article
Authors :	Name Email ORCID Nikitopoulos, K k.nikitopoulos@surrey.ac.uk Polydoros, A
Date :	1 April 2005
Identification Number :	10.1109/TCOMM.2005.843424
Depositing User :	Symplectic Elements
Date Deposited :	17 May 2017 13:34
Last Modified :	17 May 2017 15:11
URI:	http://epubs.surrey.ac.uk/id/eprint/839706

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