Equalizer and equalizing method of tapping-preset and LMS (Learning Management System) united-confrontation dynamic channel

Abstract

The invention provides an equalizing method and an equalizer of a tapping-preset and LMS (Learning Management System) united-confrontation dynamic channel, . Thewherein the method comprises the following steps of: estimating the shock response of the channel by adopting an LMS algorithm to acquire the estimated value of the channel; when detecting that a main path of the communication channel is switched, acquiring and presetting the tapping coefficient of the equalizer according to the estimated value of the channel to accomplish the initialization of the tapping coefficient of the equalizer, and then carrying out self-adaptation updating on the tapping coefficient on the basis of the LMS algorithm; and equalizing the communication channel by using the equalizer to eliminate a front-path channel in a stepwise counteracting mode and directly eliminate a back-path channel. The equalizing method realizes that the equalizer carries out rapid convergence on the basis of an ideal initial state by the LMS algorithm to realize the self-adaptation updating of the tapping coefficient of the equalizer, thereby rapidly tracking the changing channel to realize the equalization on the channel.

Description

technical field [0001] The present invention relates to a channel equalization technology of a communication system, in particular to an equalizer and an equalization method in which a communication system tap preset and a least mean square (Least mean square, LMS) algorithm jointly combat dynamic channels. Background technique [0002] During signal transmission, due to the existence of multi-path channels, it will bring Inter-Symbol Interference (ISI), and Inter-Symbol Interference is an important cause of signal errors. To solve the problem of Inter-Symbol Interference, usually adopt The equalizer compensates the intersymbol interference caused by the multipath channel from the time domain and the frequency domain respectively. [0003] Generally speaking, a single-carrier system adopts a time-domain equalization method, while a multi-carrier system adopts a frequency-domain equalization method. Theoretically, the equalization performance of a single-carrier system is th...

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Problems solved by technology

Theoretically, the equalization performance of a single-carrier system is the same as that of a multi-carrier system, but due to the limitation of hardware resources, the commonly used time-domain equalizers for single-carrier systems cannot achieve the best performance

The complexity of traditional time-domain equalizers is proportional to the maximum multipath delay, and time-domain equalizers have become the "bottleneck" that restricts the performance improvement of single-carrier systems

In the ATSC-8VSB system in the United States, the tap order of the time domain equalizer of the receiver has reached hundreds of orders, but it still cannot effectively deal with the rapidly changing dynamic channel

[0004] Facts have proved that it is difficult to overcome the fast-changing dynamic channel by simply relying on the adaptive update tap coefficient of the time-domain equalizer.

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