Title :
Performance of high rate turbo codes employing the soft-output Viterbi algorithm (SOVA)
Author :
Ghrayeb, Ali ; Ryan, William E.
Author_Institution :
Dept. of Electr. & Comput. Eng., Arizona Univ., Tucson, AZ, USA
Abstract :
We examine the performance of the iterative soft-output Viterbi algorithm (SOVA) for high rate turbo codes on an additive white Gaussian noise (AWGN) channel and compare its performance to that of the a posteriori probability (APP) algorithm. Code rates of the form k/sub 0//k/sub 0/+1 (k/sub 0/=4, 8, 16, 92, and 64) are considered. In our simulations, we show that the SOVA algorithm yields a bit error probability (P/sub b/) performance that is only about 0.7 dB inferior to the performance of the APP algorithm and about 1.7 dB from the capacity limit at P/sub b/=10/sup -5/. We also examine SOVA performance as a function of the number of iterations and a parameter we call the reliability depth.
Keywords :
AWGN channels; Viterbi decoding; channel coding; error statistics; iterative decoding; turbo codes; APP algorithm; AWGN channel; SOVA algorithm; a posteriori probability algorithm; additive white Gaussian noise channel; bit error probability; high rate turbo codes; iterative soft-output Viterbi algorithm; reliability depth; AWGN; Capacity planning; Code standards; Equations; Error probability; Gaussian noise; Iterative algorithms; Iterative decoding; Turbo codes; Viterbi algorithm;
Conference_Titel :
Signals, Systems, and Computers, 1999. Conference Record of the Thirty-Third Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-5700-0
DOI :
10.1109/ACSSC.1999.832030
