Computer Science – Information Theory
Scientific paper
2006-07-06
Proceedings IEEE 60th Vehicular Technology Conference (VTC 2004-Fall) (2004) 2409-2413
Computer Science
Information Theory
Scientific paper
The paper deals with orthogonal space-time block coded MC-CDMA systems in outdoor realistic downlink scenarios with up to two transmit and receive antennas. Assuming no channel state information at the transmitter, we compare several linear single-user detection and spreading schemes, with or without channel coding, achieving a spectral efficiency of 1-2 bits/s/Hz. The different results obtained demonstrate that spatial diversity significantly improves the performance of MC-CDMA systems, and allows different chip-mapping without notably decreasing performance. Moreover, the global system exhibits a good trade-off between complexity at mobile stations and performance. Then, Alamouti's STBC MC-CDMA schemes derive full benefit from the frequency and spatial diversities and can be considered as a very realistic and promising candidate for the air interface downlink of the 4/sup th/ generation mobile radio systems.
Baudais Jean-Yves
Hélard Jean-François
Portier Fabrice
the Projet europeen IST-MATRICE Collaboration
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