Article ID Journal Published Year Pages File Type
564541 Signal Processing 2009 12 Pages PDF
Abstract

Adaptive interference cancellation is addressed in an asynchronous orthogonal frequency-division multiplexing (OFDM) system with a frame containing a number of temporally distributed pilot symbols, e.g., as in the IEEE 802.16-2004 standard. Non-stationary symbol-by-symbol switching technique is proposed that is based on banks of the second-order statistics semi-blind solutions with on-line algorithm selection using a higher-order statistics criterion. Three banks of algorithms are formulated and analyzed by means of comparison to the conventional stationary pilot-based solution and to the non-asymptotic maximum-likelihood benchmark especially developed for assessment of the proposed interference cancellation algorithms. Their efficiency is compared to the conventional stationary solutions by means of simulations in a WiMAX (worldwide interoperability for microwave access) environment.

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Physical Sciences and Engineering Computer Science Signal Processing
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