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Blind equalization method and blind equalization system

A blind equalization algorithm and blind equalization technology, applied in baseband system components, transmitter/receiver shaping network, etc., can solve problems such as blind equalization is easy to fall into a local convergence state, and the initial value of recursive update parameters cannot be reasonably set

Inactive Publication Date: 2015-09-02
TSINGHUA UNIV
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Problems solved by technology

[0011] The present invention provides a blind equalization method and a blind equalization system to solve the technical problem that the blind equalization is more likely to fall into a local convergence state due to the nonlinear structure and the inability to reasonably set the initial value of the recursive update parameters in the TLFNN blind equalizer

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  • Blind equalization method and blind equalization system
  • Blind equalization method and blind equalization system

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Embodiment Construction

[0083] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0084] figure 1 is the basic algorithm model of blind equalization, X in the figure k =(x k,1 ,x k,2 ,...,x k,N ) T is the N-dimensional input signal vector, Φ k =(φ k,1 ,φ k,2 ,…,φ k,M ) T is the M-dimensional input transformed vector generated after the input signal undergoes input transformation, H k =(h k,1 , h k,2 ,..., h k,M ) ...

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Abstract

The invention provides a blind equalization method and a blind equalization system. The method comprises the following steps of performing input transformation on input signals and generating input vectors after transformation; acquiring output signals through a feedforward network by means of the input vectors after transformation and recursive updating parameters; when desired signals are uncertain, acquiring input decision information through input signals and acquiring output decision information through output signals; designing blind equalization algorithm by using both the input decision information and the output decision information to acquire a feedback error; and updating the recursive updating parameters through the feedback process through the feedback error and the input vectors after transformation. By additionally using the input decision information to assist the feedback process, the method can effectively prevent common local convergence problems generated during blind equalization due to the influence of the feedforward network structure and the recursive updating parameters. Robust convergence of blind equalization results is guaranteed. Meanwhile, the blind equalization performance is also ensured.

Description

technical field [0001] The invention relates to the field of wireless and digital communication, in particular to a blind equalization method and a blind equalization system. Background technique [0002] In remote sensing satellite communication, due to the influence of unideal factors such as channel, sending device and receiving device, the sending signal will be distorted or interfered with each other during transmission, that is, distortion will be generated, the most notable of which is linear distortion and nonlinear distortion. Linear distortion manifests as uneven amplitude-frequency characteristics and group delay distortion, which will cause symbol crosstalk (ISI, Intersymbol Interference) in the received signal; nonlinear distortion is generally caused by the power amplifier at the transmitting end, such as a traveling wave tube amplifier or a solid-state power amplifier. Amplifiers, caused by working in a near-saturated or saturated region, will distort the rec...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
Inventor 徐璐陈金树陆建华
Owner TSINGHUA UNIV
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