An optimum rate/power allocation scheme for downlink in hybrid CDMA/TDMA cellular system

In Internet access, portables are expected to send low bit-rate requests via uplink and receive high bit-rate information via downlink. Hence, to provide a reasonable wireless Internet access, an efficient resource allocation scheme for the downlink is necessary. We propose a scheme that finds the optimum rate and power allocation based on the channel fading condition seen at the beginning of each time slot. This algorithm should be run for every time slot to continuously optimize the rate and power of the system. Our results show that a single user system can achieve an average throughput of 1.4 Mbps and 0.9 Mbps with the E _b/I₀ requirements of 3 dB and 5 dB respectively, in a downlink using 1.25 MHz bandwidth