Variable step length least mean square channel equilibrium method based on gradient vector

A gradient vector and channel equalization technology, applied in the field of signal processing, can solve problems such as higher requirements, slow convergence speed, and unsatisfactory convergence speed of LMS algorithm, and achieve enhanced robustness, fast convergence speed, and small steady-state error Effect

Active Publication Date: 2013-10-30
哈尔滨哈船导航技术有限公司
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Problems solved by technology

[0006] Aiming at the shortcomings of the slow convergence speed of the traditional LMS algorithm and the fact that the convergence speed of the current LMS algorithm cannot meet the higher requirements for adaptive equalization, the present invention provides a gradient vector-based variable step size minimum mean square channel equalization method

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  • Variable step length least mean square channel equilibrium method based on gradient vector
  • Variable step length least mean square channel equilibrium method based on gradient vector
  • Variable step length least mean square channel equilibrium method based on gradient vector

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] Before explaining the channel equalization method of the present invention, first explain the channel equalization principle: the signal obtained after the input signal passes through the channel is no longer an ideal delayed signal of the original input signal, but a signal after being interfered by environmental noise. In order to restore the original input signal, an equalizer is added to the communication channel. The purpose of the equalizer is to adjust the weight coefficient w of the equalizer to make the total transmission characteristic function of the entire communication equalization system H=Z -τ ,Z -τ represents the ideal delay, and τ represents the delay time, so that the output signal obtained by the input signal after passing through the channel and the adjusted equalizer is the ideal delay signal of the input signal, th...

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Abstract

The invention provides a variable step least mean square channel equilibrium method based on a gradient vector, comprising the following steps of: firstly, obtaining a parameter P according to a steady state error index required by a system; then calculating a smooth amount of the gradient vector according to an error signal; calculating and obtaining a variable time step length according to the parameter P and the smooth amount of the gradient vector; then calculating and obtaining an equalizer weight coefficient according to the error signal and the variable time step length; repeating the process until a training process ends up; and setting the finally obtained equalizer weight coefficient as a weight coefficient of a current equalizer. The variable step least mean square channel equilibrium method is easily realized, has higher convergence speed and less steady state rate, obtains the optimum weight coefficient of the equalizer quickly and ensures that the equalizer achieves the effect of quickly self-adapting equilibrium.

Description

technical field [0001] The invention relates to a signal processing method, in particular to a variable-step minimum mean square channel equalization method based on gradient vectors. Background technique [0002] In the fields of communications, radar, sonar, industrial control, seismic exploration and biomedicine, there are applications of digital baseband transmission systems. In the digital baseband transmission system, the waveform of each symbol of the digital baseband signal is distorted due to the unsatisfactory channel characteristics, so that the waveforms of the preceding and following symbols overlap each other, making it difficult for the receiving end to make sampling decisions. This phenomenon is called inter-symbol interference (Inter-Symbol Interference). Interference, referred to as ISI). In order to suppress inter-symbol interference, reduce signal distortion and ensure communication quality, in the actual digital transmission system, it is necessary to c...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
Inventor 李宁张勇刚刘利强周卫东高峰刘厂
Owner 哈尔滨哈船导航技术有限公司
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