Adaptive modulation and power allocation for multicarrier DS/CDMA

To satisfy the request for high data rate and high frequency efficiency for new generation communication systems, an adaptive modulation method, subcarrier and power allocation is proposed for multicarrier DS/CDMA systems. With the downlink channel parameter acquired from the uplink channel feedback, an optimization algorithm is utilized to maximize frequency efficiency and minimize the required transmitting power for a given QoS and data throughput. Compared with non-adaptive OFDM system, the required transmitting power is greatly decreased and the convergence rate of this algorithm is very high which makes it very appropriate for engineering applications.