Future broadband wireless communication systems are expected to offer new and powerful services enabling fast transmission rates of several tens of Mbit/s. This is an ambitious challenge, especially for mobile communication systems, since these systems should be able to cope with several time dispersive channels associated with the signal multipath propagation. Moreover, these systems should have high spectral and power efficiencies as well as high capacity and flexibility. Spread spectrum techniques, particularly coded division multiple access (CDMA) techniques allow high capacity and...