METHOD FOR POWER REDUCTION IN INTER-SYMBOL INTERFERENCE LIMITED CHANNELS

摘要

Method of reducing transmission power across a loop (110) in a discrete multitone communication system (100). A first signal to noise ratio (SNR) is estimated (302) for a signal transmitted across the loop. A second SNR is estimated (304) for a signal across the loop, the second SNR signal being estimated exclusive of a predetermined portion of the first SNR. A power cutback scaling factor is determined (306) in accordance with the first SNR, the second SNR, and a predefined maximum SNR degradation amount. The transmission power is scaled (308) in accordance with said scaling factor for reducing said transmission power. In such a manner, fine gains are computed such that the transmit power is reduced without significantly affecting the achieved data rate.