Design of unpunctured turbo trellis-coded modulation |
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Authors: | Abdesselam Bassou Ali Djebbari Mohamed Benaissa |
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Affiliation: | 1. Telecommunication and Digital Signal Processing Laboratory, Djillali Liabes University, Sidi Bel Abbes 22000, Algeria;2. Department of Technology, University of Bechar, Bechar 08000, Algeria |
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Abstract: | In this paper, the design of newly introduced turbo encoding scheme called ‘Unpunctured Turbo Trellis-Coded Modulation’ (UTTCM) is exposed. The performance improvement of this encoding scheme is obtained by setting a design criterion for each of its components namely: the search rules of best constituent encoders’ generator polynomials, the constellation and the associated mapping. Simulation results show that the optimized UTTCM outperforms TTCM and PCTCM for all considered spectral efficiencies, and presents competitive error floors. As examples, for a spectral efficiency of 3 bits/symbol (bps), UTTCM with 8 decoding iterations outperforms TTCM by 0.05 dB at BER = 10?4; and for a spectral efficiency of 4 bps and 6 decoding iterations, UTTCM outperforms Fragouli's PCTCM by 0.07 dB at BER = 10?5. |
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