Performance of Improved Channel Allocation for Multicarrier CDMA with Adaptive Frequency Hopping and Multiuser Detection

Subchannel allocation for the reverse link of multicarrier code-division multiplex-access MC-CDMA system with adaptive frequency hopping AFH is investigated. An efficient allocation method that can be employed with the matched filter MF receiver as well as with multiuser detectors MUDs by exploiting the appropriate signal to interference and noise ratio SINR analysis is described. It is demonstrated that combined improved subcarrier allocation and the linear decorrelating detector LDD are very efficient in mitigating multiple-access interference MAI, resulting in much larger system capacity than for a non-adaptive MC direct-sequence DS-CDMA system. This conclusion is confirmed for realistic fading channels with correlated subcarriers and imperfect channel state information CSI at the transmitter.