Title :
Joint source and channel coding using trellis coded CPM: soft decoding
Author :
Lin, Zihuai ; Aulin, Tor
Author_Institution :
Dept. of Comput. Eng., Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
Joint source and channel (JSC) coding using combined trellis coded quantization (TCQ) and continuous phase modulation (CPM) is studied. The channel is assumed to be the additive white Gaussian noise (AWGN) channel. Optimal soft decoding for JSC coding using jointly designed TCQ/CPM is studied in this paper. The soft decoder is based on the a posteriori probability (APP) algorithm for trellis coded CPM. It is shown that the systems with soft decoding outperform the systems with hard decoding especially when the systems operate at low to medium signal-to-noise ratio (SNR). Furthermore, a TCQ design algorithm for the noisy channel is developed. It has been demonstrated that the combined TCQ/CPM systems are both power and bandwidth efficient compared with the combined TCQ/TCM/8PSK systems. The novelty of this work is the use of a soft decoder and the APP algorithm for combined TCQ/CPM systems.
Keywords :
AWGN channels; combined source-channel coding; continuous phase modulation; iterative decoding; probability; trellis coded modulation; APP algorithm; AWGN channel; SNR; TCQ/CPM; a posteriori probability; additive white Gaussian noise channel; bandwidth efficiency; continuous phase modulation; joint source channel coding; noisy channel; optimal soft decoding; power efficiency; signal-to-noise ratio; trellis coded CPM; trellis coded quantization; AWGN; Additive white noise; Algorithm design and analysis; Bandwidth; Channel coding; Continuous phase modulation; Decoding; Gaussian noise; Quantization; Signal to noise ratio;
Conference_Titel :
Data Compression Conference, 2005. Proceedings. DCC 2005
Print_ISBN :
0-7695-2309-9
DOI :
10.1109/DCC.2005.46
