CMA blind equalization variable step size optimization method for MPSK signals

An optimization method and a technology of blind equalization, which is applied in the shaping network, baseband system, digital transmission system, etc. The effect of precision

Inactive Publication Date: 2019-12-17
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0009] In order to solve the contradiction between the convergence speed and convergence accuracy of the traditional CMA algorithm, the present invention proposes a CMA blind equalization variable step size optimization method for MPSK signals

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  • CMA blind equalization variable step size optimization method for MPSK signals
  • CMA blind equalization variable step size optimization method for MPSK signals
  • CMA blind equalization variable step size optimization method for MPSK signals

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Embodiment Construction

[0030] In the attached picture, figure 1 Carry out the functional block diagram of blind equalization for the present invention, its specific implementation process uses figure 2 Flow chart representation. In order to further illustrate the content, effects and innovations of the invention, the technical details thereof are further elaborated below.

[0031] Firstly, the input signal of the blind equalizer in the present invention is the quasi-baseband signal after rough demodulation by the receiver, which is divided into two signals of I and Q. The order of the blind equalizer is N , the tap weight vector is W ( n ), the input signal is x ( n ), the output signal is y ( n ), where the input signal x ( n ) including multipath and noise. memoryless nonlinear estimator g (·) Blind equalizer output signal y ( n ) performs nonlinear transformation to obtain the estimated value of the signal at the sending end z ( n ). error signal e ( n ) through the optimized...

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Abstract

The invention discloses a CMA blind equalization variable step size optimization method for MPSK signals, and belongs to the field of digital communication signal processing. The method is characterized in that the convergence step length of a blind equalization algorithm is controlled through a blind equalization convergence error; the step length of the optimized CMA blind equalization algorithmis cooperatively controlled by an inverse proportional function and an exponential function, and the fractal property is utilized, so that the step length of the equalization algorithm is quickly reduced at the early stage of the algorithm, the convergence speed is increased, the step length of the algorithm changes slowly at the later stage of the algorithm, and residual errors are reduced. Compared with a traditional fixed-step-length CMA algorithm, the optimized CMA blind equalization algorithm has the advantages of being high in convergence speed, small in residual error and the like.

Description

technical field [0001] The invention is mainly optimized for the situation that the effect of the CMA blind equalization algorithm with fixed step length at the demodulation end of the digital communication system is not ideal. It involves the monotonic characteristic of exponential function, the monotonic characteristic of inverse proportional function, and the fractional property. It aims to improve the contradiction between convergence accuracy and convergence speed in the traditional CMA algorithm, so as to obtain better convergence performance, and belongs to the field of communication signal processing. Background technique [0002] In wireless communication systems, intersymbol interference caused by channel fading, time variation, nonlinearity and multipath propagation will lead to bit errors. In order to reduce the impact of intersymbol interference on communication demodulation performance, the channel must be properly corrected, that is, channel equalization. Th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/22
CPCH04L25/03006H04L25/03089H04L27/22H04L2025/03687
Inventor 江虹辜馨月伍春蒋亮亮杨浩
Owner SOUTHWEAT UNIV OF SCI & TECH
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