An adaptive modulation algorithm for multicarrier DS/CDMA systems

An adaptive modulation algorithm is proposed in this paper to improve the performance of the multicarrier DS/CDMA system where no frequency diversity is available and no bandwidth efficiency loss meanwhile. In our algorithm only repetitive comparison operation is need to accomplish the allocation work, and no repetitive division operation needed; this feature makes it very appropriate for engineering implementation. Simulation results demonstrate that great performance improvement can be achieved in this adaptive modulated system.