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Satellite communication timing synchronization error detection method based on full-digital receiving

A technology of error detection and timing synchronization, which is applied in the field of space communication, can solve problems such as unfavorable synchronization loop locking, system self-noise, and the inability of the receiving end to accurately recover the transmitted signal, so as to reduce system self-noise and system resource consumption, Eliminate timing error deviation and facilitate the effect of locking

Active Publication Date: 2013-12-18
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in the mobile satellite channel, aiming at the multi-value and randomness of the sent QPSK signal amplitude, even if the signal is accurately sampled, the timing error output is not zero, so it is not conducive to the synchronous loop At the same time, the system will output serious self-noise, so that the receiving end cannot accurately recover the sending signal and other problems

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  • Satellite communication timing synchronization error detection method based on full-digital receiving
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  • Satellite communication timing synchronization error detection method based on full-digital receiving

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Embodiment Construction

[0021] When the polarity jump occurs between two adjacent symbols, in order to obtain accurate and effective timing error information, the sample value relationship between the two optimal sampling points and their intermediate points after cosine roll-off shaping and filtering of two adjacent symbols is firstly considered. The influence of adjacent symbols on the intermediate value is calculated according to the minimum mean square error (MMSE) criterion, and then the influence value is eliminated. When there is no polarity jump between two adjacent symbols, consider how to reduce the self-noise caused by the inability to obtain timing information. That is, under ideal conditions, if two adjacent symbols have the same polarity, the output of the error detector is zero, otherwise the timing error value is not zero. In the E-Gardner algorithm, the sign function sign(·) is used to solve this problem. The specific steps are:

[0022] 1. The continuous quadrature QPSK signal at t...

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Abstract

Disclosed is a satellite communication timing synchronization error detection method based on full-digital receiving. In view of wide application of a Gardner algorithm in a timing synchronization loop and the limitation of the Gardner algorithm to band-limited signals, when polarity jump happens to two adjacent symbols, after two adjacent code elements are utilized for cosine roll-off forming filtering, the relation between samples of two best sampling points and the sample of a middle point of the two best sampling points is utilized, the effect of different adjacent symbols to the middle value is firstly taken into consideration and the effect value is calculated according to the minimum mean-square error criterion, and is then eliminated; when polarity jump does not happen to the adjacent symbols, how to reduce self noise generated by the situation that timing information can not be acquired is taken into consideration. A sign function sign (.) in an E-Gardner algorithm is utilized to solve the problem. Under the satellite channel environment, the enhancing algorithm is simple in structure, under the condition of a small roll-off coefficient, the performance of QPSK modulating signal clock capturing and error detection is improved, and the satellite communication timing synchronization error detection method based on full-digital receiving can effectively eliminate self-noise and reduce system resource consumption.

Description

technical field [0001] The invention relates to space communication, in particular to the time synchronization technology of the receiving end in low-orbit satellite communication. Background technique [0002] Low-orbit satellite communication is one of the hotspots of current communication development. Due to its wide coverage, high reliability, simple network topology, convenience and flexibility, etc., it is widely used in digital video broadcasting satellite system (DVB-S) and Iridium system In the satellite communication system, the phase-shift keying (PSK) modulation method has been widely used, in order to improve the performance of the satellite modem, it is necessary to introduce synchronization technology. Symbol synchronization is one of the key technologies of the satellite communication system, and its accuracy will directly affect the performance of the whole system. With the development of computer and digital signal processing technology, the traditional di...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04B17/21
CPCH04L7/0029
Inventor 李云赵艳丽刘期烈刘剑锋封彬魏武
Owner CHONGQING UNIV OF POSTS & TELECOMM
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