Title :
Multicode CDMA downlink in shadowed multipath fading
Author :
Bircan, Anil ; Sunay, M.O. ; Akansu, Ali N.
Author_Institution :
Dept. of Electr. & Comput. Eng., New Jersey Inst. of Technol., Newark, NJ, USA
Abstract :
The performance characteristics of a multicode CDMA downlink with systematic convolutional (turbo) coding are obtained under a shadowed multipath fading mobile channel. Two different iterative decoding methods are compared in two different synchronous downlink schemes operating under given channel conditions with the same transmission bandwidth as in IS-95. Multicode CDMA with logMAP decoding is observed to provide better QoS with lower bit and frame error rates, reasonable complexity and shorter decoding delay compared to DS-CDMA downlink with single code pair assigned to each user
Keywords :
code division multiple access; convolutional codes; delays; error statistics; fading channels; iterative decoding; land mobile radio; multipath channels; multiuser channels; quality of service; radio links; spread spectrum communication; turbo codes; BER; DS-CDMA; DS-CDMA downlink; IS-95; QoS; bit error rate; channel conditions; decoding delay; frame error rate; iterative decoding methods; logMAP decoding; multicode CDMA downlink; performance characteristics; shadowed multipath fading mobile channel; single code pair; spread spectrum radio interface; synchronous downlink; systematic convolutional coding; transmission bandwidth; turbo coding; Bandwidth; Convolutional codes; Digital modulation; Downlink; Fading; Frequency; Iterative decoding; Modulation coding; Multiaccess communication; Transmitters;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.936983
