Title :
A burst-by-burst adaptive joint-detection based CDMA speech transceiver
Author :
How, H.T. ; Liew, T.H. ; Kuan, E.L. ; Hanzo, L.
Author_Institution :
Dept. of Electron. & Comput. Sci., Southampton Univ., UK
fDate :
6/23/1905 12:00:00 AM
Abstract :
A burst-by-burst adaptive speech transceiver is proposed, which can drop its source coding rate and speech quality under transceiver control in order to invoke a more error resilient modem mode amongst less favourable channel conditions. The novel, high-quality, adaptive multi-rate (AMR) speech codec (see GSM 06.90, version 7.0.0, 1998), operated at bit rates of 4.75 and 10.2 kbps and combined with source-sensitivity-matched redundant residue number systems (RRNS) based channel codes. Burst-by-burst adaptive joint-detection based code division multiple access (JD-CDMA) is used for transmitting the dual-rate bitstream generated by the AMR speech codec.
Keywords :
adaptive codes; code division multiple access; combined source-channel coding; demodulation; mobile radio; modems; phase shift keying; quadrature amplitude modulation; residue number systems; speech codecs; speech coding; time-varying channels; transceivers; 10.2 kbit/s; 4.75 kbit/s; BPSK/4QAM modem; CDMA; adaptive multi-rate speech codec; burst-by-burst adaptive speech transceiver; dual-rate bitstream; error resilient mode; joint detection; mobile channel; modem mode; redundant residue number systems; source coding rate; speech quality; time varying channel; Adaptive control; Error correction; GSM; Modems; Multiaccess communication; Programmable control; Source coding; Speech codecs; Speech coding; Transceivers;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th
Print_ISBN :
0-7803-7005-8
DOI :
10.1109/VTC.2001.956591
