Title :
On performance of multiuser OFDM systems with transmit diversity
Author :
Tran, X.N. ; Fujino, Tadashi ; Karasawa, Yoshio
Author_Institution :
Dept. of Inf. & Commun. Eng., Univ. of Electro-Commun., Tokyo, Japan
Abstract :
Performance of multiuser orthogonal frequency division multiplexing (OFDM) systems with transmit diversity over the frequency selective fading channel is explored. We develop a signal model for the multiuser OFDM system using Alamouti´s transmit diversity scheme and apply the minimum mean square error (MMSE) method to detect the transmitted symbols of cochannel users. Performance analysis is carried out for a 2×4 multiple input multiple output (MIMO) system with different number of cochannel users. It is shown that performance of the OFDM with transmit diversity in a multiuser system depends significantly on the degree of freedom (DOF) available at the receive array.
Keywords :
MIMO systems; OFDM modulation; antenna arrays; diversity reception; fading channels; least mean squares methods; multipath channels; multiuser detection; receiving antennas; space-time codes; Alamoutis transmit diversity scheme; DOF; MIMO; MMSE; OFDM; cochannel symbol; degree of freedom; frequency selective fading channel; minimum mean square error method; multiple input multiple output system; multiuser orthogonal frequency division multiplexing system; receive array; space-time code; Block codes; Fading; Frequency diversity; Intersymbol interference; MIMO; Mean square error methods; OFDM; Performance analysis; Signal to noise ratio; Wireless LAN;
Conference_Titel :
Signal Processing and Information Technology, 2004. Proceedings of the Fourth IEEE International Symposium on
Print_ISBN :
0-7803-8689-2
DOI :
10.1109/ISSPIT.2004.1433808
