Title :
Transmit diversity by antenna selection in CDMA downlink
Author :
Hottinen, Ari ; Wichman, Risto
Author_Institution :
Nokia Res. Center, Espoo, Finland
Abstract :
We study transmit diversity concepts in DS/CDMA wireless networks with multiple transmit antennas. The previously proposed diversity techniques are reviewed and their performance is compared to a selective transmit diversity (STD) concept, proposed here for CDMA systems. In all the competing concepts the encoded bits are distributed to all transmit antennas, whereas in the proposed concept bit are transmitted only from the best antenna as indicated by a closed loop antenna selection (CL-AS) subchannel from the terminal to the base. We quantify the achievable gains for these transmit diversity concepts with Monte-Carlo simulations
Keywords :
Monte Carlo methods; dipole antennas; diversity reception; land mobile radio; radio links; radio networks; spread spectrum communication; transmitting antennas; CDMA downlink; DS/CDMA wireless networks; Monte-Carlo simulations; closed loop antenna selection subchannel; encoded bits; multiple transmit antennas; performance; selective transmit diversity; terminal; third generation system; transmit diversity; Bandwidth; Downlink; Finite impulse response filter; Frequency conversion; Intelligent networks; Multiaccess communication; Nonlinear filters; Receiving antennas; Space time codes; Transmitting antennas;
Conference_Titel :
Spread Spectrum Techniques and Applications, 1998. Proceedings., 1998 IEEE 5th International Symposium on
Conference_Location :
Sun City
Print_ISBN :
0-7803-4281-X
DOI :
10.1109/ISSSTA.1998.722481
