DocumentCode :
1637757
Title :
Improving performance of a space-time turbo code in a Rayleigh fading channel
Author :
Huang, Everest ; Gatherer, Alan ; Muharemovic, Tarik ; Hocevar, Dale
Author_Institution :
Wireless Commun. Branch DSPS R&D Center, Texas Instrum. Inc., Dallas, TX, USA
Volume :
1
fYear :
2001
fDate :
6/23/1905 12:00:00 AM
Firstpage :
3
Abstract :
Starting with an ordinary parallel concatenated turbo encoder in a block fading Rayleigh channel, we introduce bit-interleaving of the outputs, not for time diversity, but to increase the coding gain. We develop a guideline metric for designing QPSK space-time codes which reveals both the coding and diversity advantage of the systems as well as showing that it is unnecessary to guarantee full space diversity to achieve good performance in Rayleigh fading. Using channel a priori information in the MAP iterations for decoding, we achieve frame error rates within 1 dB of the outage probability with only modest increases in decoding complexity.
Keywords :
Rayleigh channels; channel coding; concatenated codes; error statistics; interleaved codes; iterative decoding; maximum likelihood decoding; mobile radio; multipath channels; probability; quadrature phase shift keying; turbo codes; MAP iterations; QPSK; Rayleigh fading channel; block fading channel; channel a priori information; coding gain; decoding; diversity; frame error rates; mobile telephone; multipath interference; outage probability; output bit-interleaving; parallel concatenated encoder; performance; space-time turbo code; wireless channel; Concatenated codes; Error analysis; Extraterrestrial measurements; Fading; Guidelines; Iterative decoding; Quadrature phase shift keying; Rayleigh channels; Space time codes; Turbo codes;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th
ISSN :
1090-3038
Print_ISBN :
0-7803-7005-8
Type :
conf
DOI :
10.1109/VTC.2001.956542
Filename :
956542
Link To Document :
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