Self-adaption blind equalization method in high-speed data transmission system

Abstract

The invention discloses a self-adaption blind equalization method in a high-speed data transmission system. A satellite communication channel is modeled and group time delay and a non-linear characteristic of the channel are simulated. In an initial working phase of an equalizer, a CMA algorithm irrelevant to decision correctness is employed. The algorithm is applicable to various constant modulus modulation signals and is applicable to various satellite communication environments. Most of ISI is eliminated by self-adaptively equalizing received signals in a very large application range. When a system is basically stable, namely when the CMA algorithm is converged stably and most of the ISI is eliminated, an error probability of passing through a decider by carrier synchronized signals is controlled within a certain range. A decision feedback loop is started at this moment. The intersymbol interference is furthered reduced by the equalizer through adoption of a DD-LMS algorithm with relatively few residual errors. The residual errors are greatly reduced, and the system performance is improved.

Description

Technical field [0001] The present invention belongs to the field of broadband satellite communication, and in particular relates to an adaptive blind equalization method in a high-speed data transmission system, and further relates to a high-speed parallel adaptive blind equalization method in a broadband satellite communication high-speed data transmission system. Background technique [0002] In recent years, high-speed data transmission technology has been highly valued in the fields of deep-space communications, aerospace measurement and control, remote sensing, and satellite communications, and has been rapidly developed and widely used. However, with the increase of high-speed data transmission rate, due to the limited channel bandwidth and multipath effects, the frequency response of the channel deviates from the ideal uniform amplitude and linear phase, causing serious inter-symbol interference and group time. Extension effect. In order to eliminate or reduce the impact...

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Problems solved by technology

[0005] Aiming at the problems of intersymbol interference and group delay faced in the satellite communication high-speed data transmission system, the present invention provides a high-speed parallel adaptive blind equalization method combining the CMA algorithm and the DD-LMS algorithm, drawing on the existing broadband satellite communication high-speed data transmission equalization method Thought and equalization algorithm, from the perspective of reducing or eliminating inter-symbol interference, real-time and accurate compensation of uncertain group delay in satellite communication system, without increasing the complexity of the algorithm, it provides high-speed data transmission in broadband satellite communication The system provides an equalization technology with better system optimization performance, which effectively improves the communication quality and reduces the bit error rate at the receiving end

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