Title :
Soft-combining for linear unequal error protection codes
Author :
Zepernick, Hans-Jürgen ; Rohani, Bijan
Author_Institution :
Australian Telecommun. Coop. Res. Centre, Perth, WA, Australia
Abstract :
Soft-combining techniques can be used to provide reliable communication over very noisy channels. This is achieved by repeating and then combining codewords until a desired reliability level has been obtained. The heart of the presented soft-combining approach for linear unequal error protection codes is a maximum a posteriori decoder. The decoding problem is mapped into a spectral domain with a greatly simplified computational structure. The decoder releases soft-output, which is used later on as a priori information for decoding of a retransmitted codeword. Numerical examples show that significant performance improvement can be obtained with soft-combining compared to simple soft decision decoding
Keywords :
error correction codes; linear codes; maximum likelihood decoding; spectral-domain analysis; MAP decoding; decoding problem; linear unequal error protection codes; maximum a posteriori decoder; reliable communication; retransmitted codeword; soft-combining technique; soft-output; spectral domain; very noisy channels; Australia; Automatic repeat request; Data communication; Error correction codes; Hamming distance; Heart; Iterative decoding; Maximum likelihood decoding; Protection; Speech;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.937217
