Adaptive bit swapping method and device for discrete multitone system

摘要

Adaptive bit swapping method and device are provided. The method includes the steps of (a) initializing the DMT system to transmit the data via the channel in a steady state; (b) selecting a frame having an inserted sync block from a frame structure of the transmitted data; (c) calculating the signal-to-noise ratios (SNRs) of respective sub-channels of the selected frame; (d) calculating first difference value between the present representative SNRs calculated in step (c) and the previous representative SNRs of each sub-channel; (e) selecting a maximum value and minimum value among the first difference values of the respective sub-channels; (f) obtaining the second difference value between the maximum value and the minimum value; (g) determining whether the second difference value is equal to or greater than the predetermined threshold value; and (h) correcting bit and power assigning tables of a transmitter and a receiver if the second difference value is greater than or equal to the threshold value. In addition, the bit and power assigning tables can be accurately corrected since bits and power are swapped using an actually measured SNR.