Title :
A low-complexity toll-quality variable bit rate coder for CDMA cellular systems
Author :
Kroon, Peter ; Recchione, Michael
Author_Institution :
AT&T Bell Labs., Murray Hill, NJ, USA
Abstract :
With the deployment of digital cellular systems such as 13 kb/s GSM RPE-LTP, 8 kb/s fixed rate IS54 VSELP and 8 kb/s variable rate IS96 QCELP it is becoming clear that these coders are not as robust as originally expected. As a result there has been renewed interest in higher bit rate coders that provide toll quality performance with regard to various input signals and multiple encoding. This paper describes the implementation of a toll quality 13 kb/s CELP coder. This coder can also operate at a variable bit rate mode (13, 6.5 and 0.8 kb/s), and has potential applications for a revised CDMA cellular system and PCS systems based on GSM
Keywords :
cellular radio; code division multiple access; digital radio; land mobile radio; linear predictive coding; personal communication networks; speech coding; variable rate codes; vocoders; 0.8 kbit/s; 13 kbit/s; 6.5 kbit/s; 8 kbit/s; CDMA cellular systems; CELP coder; GSM; GSM RPE-LTP; PCS systems; digital cellular systems; fixed rate IS54 VSELP; input signals; low-complexity toll-quality coder; multiple encoding; toll quality performance; variable bit rate coder; variable rate IS96 QCELP; Background noise; Bit rate; Decoding; Delay estimation; Encoding; GSM; Linear predictive coding; Multiaccess communication; Personal communication networks; Robustness; Speech analysis;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1995. ICASSP-95., 1995 International Conference on
Conference_Location :
Detroit, MI
Print_ISBN :
0-7803-2431-5
DOI :
10.1109/ICASSP.1995.479260
