Multi sub-channel parallel bit loading method for optimal power distribution in DMT system

Abstract

The invention belongs to a dispersed multi-audio frequency modulation system resource distribution technique, which is characterized in that: in initialization step, loading maximum speed byte on the system, according to target error code demand, sub-channel attenuation and noise interference, and limited by system maximum power density spectrum and maximum QAM constellation size; in the target speed byte distribution step, processing multiple sub-channel parallel loading on one effective byte distribution relative to initialization loading process, utilizing blind-multiple/single-byte and/or non-blind single byte parallel increase and delete to quickly retract to target byte rate according to the difference between the initialization byte rate and the target byte rate. The invention can avoid general greed loading method, while it can keep the validity of byte loading in the parallel loading process that tending to the target byte rate, and realize the byte loading in optimized power distribution, with minimum calculation and less complex.

Description

technical field [0001] The multi-sub-channel parallel bit loading method for optimal power allocation in a DMT system belongs to the resource allocation technology of a discrete multi-tone modulation communication system. Background technique [0002] With the development of the Internet and the increasing demand of users for multimedia broadband digital services, it is required that the next generation broadband communication system not only can reliably perform high-speed data transmission, but also can flexibly allocate system resources to meet the different needs of different types of services. [0003] Discrete Multitone Modulation (DMT) is a special form of multicarrier modulation technique. DMT divides the communication channel into a sufficient number of narrowband sub-channels, each sub-carrier is independently QAM modulated, and IDFT and DFT are used to modulate and demodulate the signal. It is especially suitable for high-speed data transmission in the channel en...

AI Technical Summary

Problems solved by technology

The same as other algorithms that have been proposed so far, this algorithm still needs to use the LC algorithm to converge to the target rate in the final stage. When the target rate is very low or close to the maximum rate limit of the system, the amount of calculation increases rapidly and the performance of the algorithm decreases.

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