Title :
Transmission diversity in wideband CDMA
Author :
Raitola, Mika ; Hottinen, Ari ; Wichman, Risto
Author_Institution :
Nokia Telecommun., Finland
Abstract :
We study two transmission diversity techniques in wideband CDMA system. The studied techniques are time switched transmission diversity (TSTD) and selection transmission diversity (STD). In TSTD encoded bits are distributed between all transmission antennas. In STD encoded bits are transmitted through the best transmission antenna. STD requires that a mobile measures which is the best antenna and transmits this information to the base station. We have compared these two methods and a single antenna case and found that TSTD is over 2 dB better and STD 3 dB better than the single antenna case. We have also found that in WCDMA STD can tolerate relatively high amount of feedback signaling errors
Keywords :
broadband networks; cellular radio; code division multiple access; diversity reception; power control; radio networks; telecommunication control; telecommunication signalling; transmitting antennas; STD signaling; base station; encoded bits distribution; feedback signaling errors; mobile radio; selection transmission diversity; single antenna case; third generation cellular systems; time switched transmission diversity; transmission antennas; transmission diversity; transmission power control; wideband CDMA system; Base stations; Channel estimation; Diversity reception; Downlink; Feedback; Mobile antennas; Multiaccess communication; Sections; Transmitting antennas; Wideband;
Conference_Titel :
Vehicular Technology Conference, 1999 IEEE 49th
Conference_Location :
Houston, TX
Print_ISBN :
0-7803-5565-2
DOI :
10.1109/VETEC.1999.780606
