Patent ID: 8320480
Filing Date: 2012-11-27
Classification: H04L,H04M

Abstract:
1. A method in a multi-tone based multi-line communication system for determining an optimal number of bits to be allocated for each line and each tone subject to a predefined power constraint per line and subject to a required bit error rate (BER), wherein each line passes through a pre-processor adapted to pre-process data carried by each line, the method comprising the steps of: (a) determining a first number of total bits to be allocated for each tone and each line before processing by the pre-processor; (b) estimating the transmit power required after the pre-processing for the first number of bits subject to the required BER; (c1) reducing the first number of bits to a second number of bits for a selected tone and line if the first number of bits is too high subject to an estimated required power after processing by the pre-processor compared to the predefined power constraints; (d1) estimating the transmit power required after the pre-processing for the second number of bits subject to the required BER; and (e1) repeating steps (c1)-(d1), wherein the second number of bits is set to the first number of bits, until the optimal number of bits to be allocated subject to the power constraint per line and subject to the required BER is achieved; wherein the tone and the line are selected such that changing from the first number of bits to the second number of bits provides the greatest power reduction compared with any reduction resulting from changing from the first number to the second number of bits on any other of the remaining lines and tones.