Title :
Multiuser space-time code for OFDM/SDMA systems [WLAN applications]
Author :
Xu, Bin ; Yang, Chenyang ; Shiyi Mao
Author_Institution :
Sch. of Electron. & Inf. Eng., Beihang Univ., Beijing, China
Abstract :
A combined OFDM/SDMA-DAU (double antenna users) system is investigated, where the base station is installed with multiple antennas and each user terminal is equipped with two antennas. A multiuser space-time code algorithm with channel state information at the transmitter is presented for the downlink of the OFDM/SDMA-DAU system, where the receivers can achieve multiuser interference suppression and diversity by a low-complexity and efficient decoding approach. Simulation results verify that the OFDM/SDMA-DAU system, benefitting from the advantages of OFDM, SDMA and space-time coding, outperforms the OFDM/SDMA-SAU (single antenna users) system with respect to not only the BER performance but also the transmitted power fluctuation.
Keywords :
OFDM modulation; diversity reception; error statistics; interference suppression; multipath channels; multiuser channels; space division multiple access; space-time codes; wireless LAN; BER; OFDM/SDMA-DAU; WLAN; base station multiple antennas; channel state information; double antenna users system; downlink; dual-antenna user terminals; multipath interference; multiuser interference suppression; multiuser space-time code; receiver diversity; single antenna users system; transmitted power fluctuation; Base stations; Channel state information; Decoding; Downlink; Interference suppression; Multiaccess communication; OFDM; Space time codes; Transmitters; Wireless LAN;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th
Print_ISBN :
0-7803-8255-2
DOI :
10.1109/VETECS.2004.1388945
