Title :
Joint source-channel and multiuser decoding for Rayleigh fading CDMA channels
Author :
Ottosson, Tony ; Skoglund, Mikael
Author_Institution :
Dept. of Signals & Syst., Chalmers Univ. of Technol., Goteborg, Sweden
fDate :
1/1/2000 12:00:00 AM
Abstract :
We consider joint source-channel and multiuser decoding for frequency selective Rayleigh fading code-division multiple-access channels. The block source-channel encoder is defined by a vector quantizer. We investigate optimal (minimum mean-square error) decoding and “user-separated” decoding of lower complexity. The studied decoders are soft in the sense that they utilize all soft information available at the receiver. Simulations indicate significant performance gains of the introduced decoders compared with a tandem approach that uses maximum-likelihood multiuser detection plus table-lookup decoding
Keywords :
Rayleigh channels; code division multiple access; combined source-channel coding; decoding; land mobile radio; multiuser channels; radio links; vector quantisation; Hadamard based multiuser decoder; MMSE decoding; Rayleigh fading CDMA channels; block source-channel encoder; code-division multiple-access; downlink transmission; frequency selective Rayleigh fading; joint source-channel decoding; maximum-likelihood multiuser detection; minimum mean-square error; mobile radio; optimal decoding; simulations; soft decoders; synchronized uplink; table-lookup decoding; tandem approach; user-separated decoding; vector quantizer; AWGN; Delay lines; Entropy; Frequency; Maximum likelihood decoding; Maximum likelihood detection; Multiaccess communication; Multiuser detection; Performance gain; Rayleigh channels;
Journal_Title :
Communications, IEEE Transactions on
