Turbo Receiver for OFDM Signals with Interchannel Interference

Alexander N. LOZHKIN  

IEICE TRANSACTIONS on Communications   Vol.E86-B   No.8   pp.2395-2413
Publication Date: 2003/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technology
OFDM,  DMT,  multicarrier system,  interchannel interference,  frequency offset,  

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With the growing demand for mobile communications, multicarrier (MC) schemes are receiving an increasing amount of attention, primarily because they handle frequency selective channels better than ordinary single-carrier schemes. However, despite offering several advantages, MC systems have certain weak points. One is a high sensitivity to interchannel interference (ICI). Using a Markov chain approach, we synthesized an optimal receiver for a situation where interference affects three adjacent subchannels. Simulation results showed that the proposed 'turbo scheme' provided better BER performance than a conventional receiver, especially at higher signal-to-noise ratios. The implementation of the turbo algorithm is independent of the transmitted signal, providing complete OFDM reception compatibility.