Forward Link Performance of CDMA/FDM Systems with Truncated Adaptive Transmission

A hybrid multicarrier CDMA/FDM system with a truncated adaptive transmission scheme is analyzed in forward link, based on the feedback information from the mobile station. In the single cell environment, the proposed scheme outperforms the adaptive FH/DS system as well as the MC DS/CDMA system when orthogonal signature sequences are used. In the multiple cell environment also, the proposed scheme has better performance characteristics than the adaptive FH/DS system when orthogonal and random codes are used as spreading sequences.