Fast Power Allocation In Wireless Multi Channel Systems

Inmulti-channel communications, Water-Filling (WF) is a fundamental power allocation mechanismfor capacity maximization under a given total transmit power.In this letter, we propose simple and fast WF algorithms forachieving agile power allocation, such that the system can bettermatch thedynamic nature of the wireless channels for a betterperformance. Our algorithms remove the need of water-levelsearching. Numerical results show that they can run multipletimes faster than the existing ones and can converge to theoptimal solution in a few linear calculations.