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Information Technology Journal

Year: 2007 | Volume: 6 | Issue: 2 | Page No.: 207-211
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Authors

S. Elahmar

A. Djebbari

M. Bouziani

J.M. Rouvaen

Keywords

Research Article

New Results with Blind Time Domain Equalization for OFDM System

S. Elahmar, A. Djebbari, M. Bouziani and J.M. Rouvaen
The Multicarrier Equalization by Restoration of RedundancY (MERRY) algorithm has been shown to blindly and adaptively shorten a channel to the length of the guard interval in an OFDM system. Most published works on blind Time Domain Equalization (TEQ) convergence analysis are confined to Ts-spaced equalizers. The common belief is that analysis of fractionally-spaced TEQ (FSTEQ’s) is a straightforward extension with similar results. This belief is, in fact, untrue. In this study, we present a convergence analysis of MERRY fractionally-spaced TEQ’s that proves the important advantages provided by the FSTEQ structure. We show that the FSTEQ MERRY algorithm converges significantly faster than the non-fractional TEQ MERRY algorithm. The main reason is that a fractionally-spaced blind adaptive TEQ admits infinitely many realizations of perfect channel shortening for a specific delay whereas a non-fractionally-spaced TEQ admits only one realization. Computer simulation demonstrates the performance improvement provided by the blind adaptive fractionally-spaced TEQ using MERRY algorithm for OFDM system.
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