Optimal power allocation in CDMA forward link using dependency between pilot and traffic channels

This paper shows a new method for minimizing the transmit power on CDMA forward link channels. Different from previous works, the proposed method uses the dependency that exists between the respective signal qualities of the pilot channel and traffic channels. Since present CDMA forward link exploits coherent demodulation with continuously transmitting pilot signals, the stronger the pilot channel is, the less traffic power may be required while the same transmission quality is maintained. With laboratory tests, the dependency is graphed. And then an optimal pilot signal quality is found, which minimizes the total transmit power. Considering various mobile environments, -10 dB is an outstanding choice for the pilot signal quality. This solution can be directly applied to maximize the capacity of CDMA cellular and PCS systems or improve the service quality at the cell edge.