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Satellite channel multi-mode blind equalization algorithm

A multi-mode blind equalization, satellite channel technology, applied in radio transmission systems, shaping networks in transmitter/receiver, electrical components, etc., can solve problems such as high judgment error rate and algorithm failure to converge

Inactive Publication Date: 2017-06-20
NANJING UNIV
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Problems solved by technology

However, if the channel changes a lot, it will lead to a high decision error rate, which will make the algorithm unable to converge. Therefore, the decision-making algorithm is often applied to the balanced signal that has tended to converge.

Method used

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  • Satellite channel multi-mode blind equalization algorithm

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Embodiment Construction

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0037] Such as figure 1 , figure 2 A satellite channel multi-mode blind equalization algorithm shown includes:

[0038] S1, the satellite signal y(n) is equalized to generate a discrete time signal z(n), and the absolute value of the decision error |d(n)| is calculated for the discrete time signal. The steps are as follows:

[0039] Such as figure 2 As shown, in the blind equalization system, x(n) is the sending sequence, h(n) is the impulse response of ...

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Abstract

The invention discloses a satellite channel multi-mode blind equalization algorithm, and the algorithm comprises the steps: firstly carrying out the equalization of a satellite signal, generating a discrete time signal, and calculating a judgment error absolute value of the discrete time signal; secondly processing the judgment error absolute value through employing a VS-CMA algorithm when the judgment error absolute value is greater than a preset maximum judgment error threshold value; thirdly carrying out the processing of the judgment error absolute value through employing a DD-LMS algorithm when the judgment error absolute value is less than a preset minimum judgment error threshold value; finally carrying out the processing of the judgment error absolute value through employing the VS-CMA algorithm and the DD-LMS algorithm when the judgment error absolute value is greater than the preset minimum judgment error threshold value and less than the preset maximum judgment error threshold value. The method introduces a nonlinear residual error function to control the step of the CMA algorithm, so as to achieve the variable-step CMA algorithm. The method provided by the invention is smaller in residual error, is higher in convergence speed, enables intersymbol interference to be smaller, and is strong in tracking capability of time-variable channel.

Description

technical field [0001] The invention relates to satellite channel equalization technology, in particular to a satellite channel multi-mode blind equalization algorithm. Background technique [0002] Satellite communication has a long transmission distance, is not restricted by any complicated geographical conditions between two points of communication, and is not affected by any natural disasters and man-made events between two points. It is widely used in military communications, satellite TV broadcasting, etc. However, in the relay satellite communication system, the frequency selective fading is large, the channel propagation delay is long, and the Doppler frequency shift is serious. These shortcomings affect the signal transmission quality to a large extent and make the intersymbol interference very serious. Even affect the normal work of the system. In order to obtain the ideal communication effect, it is necessary to improve the transmission characteristics and reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04B7/185
CPCH04B7/18513H04L25/03089H04L25/03878
Inventor 叶芝慧周鑫张婧
Owner NANJING UNIV
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