Title :
A ML rate detection algorithm for IS-95 CDMA
Author :
Gutierrez, Alberto ; Lee, Yuan Kang ; Mandyam, Giridhar
Author_Institution :
Nortel Wireless Networks, Richardson, TX, USA
Abstract :
A variable rate source code is often employed for coding of voice frames in CDMA communication systems followed by forward error correction coding. This paper derives a maximum likelihood detection algorithm for determination of the source rate prior to decoding of the forward error correction code. When the source rate is not known to the receiver a-priori, a rate detection algorithm can reduce the computational complexity with respect to decoding once for every possible source rate. The maximum likelihood rate detection algorithm is developed for rate set 1 and rate set 2 of the IS-95 standard, and the performance of the rate set 1 algorithm is characterized via simulation for AWGN and Rayleigh fading channels
Keywords :
AWGN channels; Rayleigh channels; cellular radio; channel coding; code division multiple access; computational complexity; error correction codes; forward error correction; maximum likelihood decoding; maximum likelihood detection; source coding; variable rate codes; AWGN channels; IS-95 CDMA; IS-95 standard; ML rate detection algorithm; Rayleigh fading channels; cellular radio; computational complexity; decoding; forward error correction coding; maximum likelihood detection algorithm; mobile radio; source rate; variable rate source code; voice frames coding; AWGN; Computational complexity; Computational modeling; Detection algorithms; Fading; Forward error correction; Maximum likelihood decoding; Maximum likelihood detection; Multiaccess communication; Standards development;
Conference_Titel :
Vehicular Technology Conference, 1999 IEEE 49th
Conference_Location :
Houston, TX
Print_ISBN :
0-7803-5565-2
DOI :
10.1109/VETEC.1999.778089
