Title :
Space-time coding over a code division multiple access system
Author :
Tehrani, Ardavan Maleki ; Negi, Rohit ; Cioffi, John
Author_Institution :
Dept. of Electr. Eng., Stanford Univ., CA, USA
Abstract :
We discuss the usage of space-time coding with multi-antenna transmission for a DS/CDMA system. We have considered an L-multipath, M-mobile antenna system in which the base station has a phased N-antenna array (i.e. fading at the base station antennas is completely correlated). We have shown that for the considered DS/CDMA system, for the channel with no ISI, adaptive antennas, with optimized transmit vector, can be combined with space-time coding (e.g. delay-diversity coding) to achieve a diversity gain of ML and a large coding gain whenever N⩾L
Keywords :
MIMO systems; adaptive antenna arrays; array signal processing; channel coding; code division multiple access; delays; diversity reception; fading channels; land mobile radio; mobile antennas; multipath channels; multiuser channels; spread spectrum communication; DS/CDMA system; MIMO CDMA system; base station; base station antennas; code division multiple access system; coding gain; correlated fading; delay-diversity coding; diversity gain; downlink system model; mobile antenna system; multi-antenna transmission; optimized transmit vector; optimum transmit filter; phased antenna array; receiver structure; space-time coding; transmit optimization problem; transmitter structure; Adaptive arrays; Antenna arrays; Base stations; Delay; Diversity methods; Fading; Intersymbol interference; Multiaccess communication; Phased arrays; Transmitting antennas;
Conference_Titel :
Wireless Communications and Networking Conference, 1999. WCNC. 1999 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-5668-3
DOI :
10.1109/WCNC.1999.797801
