Title :
Comparison of optimum and sub-optimum turbo decoding schemes in 3rd generation cdma2000 mobile system
Author :
Luukkanen, Petteri ; Zhang, Ping
Author_Institution :
Nokia Res. Center, Irving, TX, USA
fDate :
6/21/1905 12:00:00 AM
Abstract :
The performance of optimum and sub-optimum turbo decoding schemes in the 3rd generation cdma2000 mobile system is evaluated in this paper. The turbo code is recommended as a channel coding scheme in cdma2000 for data rates higher than 14.4 kbps due to its superior performance over the conventional convolutional code. We compare the performance of turbo codes using optimum log-MAP decoder and sub-optimum max-log-MAP and SOVA decoding schemes in direct spread forward link (from BS to MS). Different multipath channel environments are studied with Monte-Carlo simulations. The effect of channel estimation is also addressed. The performance of turbo codes is compared to conventional convolutional coding. It is shown that in practical system the performance of sub-optimum max-log-MAP decoder is comparable to log-MAP
Keywords :
Monte Carlo methods; Rayleigh channels; Viterbi decoding; channel coding; code division multiple access; convolutional codes; digital simulation; land mobile radio; maximum likelihood decoding; multipath channels; multiuser channels; optimisation; parameter estimation; radio links; spread spectrum communication; turbo codes; 3rd generation cdma2000 mobile system; AWGN channel; BER; Monte-Carlo simulations; SOVA decoding; channel coding; channel estimation; convolutional code; data rates; direct spread forward link; frame error rate; multipath Rayleigh fading channel; multipath channel environments; optimum log-MAP decoder; optimum turbo decoding; performance; sub-optimum max-log-MAP decoder; sub-optimum turbo decoding; turbo code; AWGN; Channel coding; Channel estimation; Convolutional codes; Iterative decoding; Mobile communication; Multipath channels; Traffic control; Turbo codes; Viterbi algorithm;
Conference_Titel :
Wireless Communications and Networking Conference, 1999. WCNC. 1999 IEEE
Print_ISBN :
0-7803-5668-3
DOI :
10.1109/WCNC.1999.797863
