Equalização Turbo para Canais Desconhecidos: Uma Abordagem Semi-Cega
(Turbo Equalization for Unknown Channels: A Semi-Blind Approach)
Richard Demo Souza (firstname.lastname@example.org)1, Javier Garcia-Frias (email@example.com)2, Bartolomeu F. Uchôa-Filho (firstname.lastname@example.org)3
1Graduate School in Electrical Engineering and Industrial Computer Science (CPGEI), Federal Center of Technological Education (CEFET-PR), Curitiba-PR, Brazil2Electrical and Computer Engineering Department, University of Delaware, Newark-DE, EUA3Communications 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
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.
turbo equalization, Baum-Welch algorithm, semi-blind estimation, turbo codes, ISI channels
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