Frequency-time domain transmit power adaptation for a multicarrier system in fading channels

Abstract

A multicarrier system, which is under consideration for high data rate transmission in the future, offers robustness to multipath fading in a wireless channel. We develop the optimal transmit power adaptation method to maximize the channel capacity of a multicarrier system, considering both frequency and time domains. The optimal transmit power adaptation policy with average transmit power constraint is found to be "water-pouring" in the frequency-time domain. We also show that the channel capacity with the frequency-time domain transmit power adaptation is greater than that with only the frequency domain transmit power adaptation.