Equalização Turbo para Canais Desconhecidos: Uma Abordagem Semi-Cega (Turbo Equalization for Unknown Channels: A Semi-Blind Approach)

Richard Demo Souza (richard@cpgei.cefetpr.br)1, Javier Garcia-Frias (jgarcia@ece.udel.edu)2, Bartolomeu F. Uchôa-Filho (uchoa@eel.ufsc.br)3


1Graduate School in Electrical Engineering and Industrial Computer Science (CPGEI), Federal Center of Technological Education (CEFET-PR), Curitiba-PR, Brazil
2Electrical and Computer Engineering Department, University of Delaware, Newark-DE, EUA
3Communications Research Group (GPqCom), Electrical Engineering Department, Federal University of Santa Catarina (UFSC), Florianópolis-SC, Brazil

This paper appears in: Revista IEEE América Latina

Publication Date: June 2004
Volume: 2,   Issue: 2 
ISSN: 1548-0992


Abstract:
We present a semi-blind approach to combined detection and turbo decoding for unknown ISI channels. The proposed method utilizes very few training symbols and minimizes the probability of ill-convergence characteristic of full-blind approaches, even for long ISI channels. Furthermore, the semi-blind approach leads to an improved bit error rate performance and a decrease in the overall computational burden when compared with full blind schemes. The reduction in computational complexity increases with the ISI channel length.

Index Terms:
turbo equalization, Baum-Welch algorithm, semi-blind estimation, turbo codes, ISI channels   


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