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Timing synchronization method in low-orbit satellite communication system

A satellite communication system and timing synchronization technology, applied in the field of low-orbit satellite communication systems, can solve problems such as timing ambiguity

Active Publication Date: 2017-03-22
SHANGHAI ENG CENT FOR MICROSATELLITES
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

In this regard, H.Minn proposed a kind of The improvement scheme eliminates the platform effect, but its timing measurement contains side lobes. When the signal-to-noise ratio is low, the side lobes may exceed the main lobe and cause timing ambiguity.

Method used

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  • Timing synchronization method in low-orbit satellite communication system
  • Timing synchronization method in low-orbit satellite communication system
  • Timing synchronization method in low-orbit satellite communication system

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Embodiment Construction

[0026] The specific implementation of the timing synchronization method in the low-orbit satellite communication system provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] The purpose of the present invention is to provide a new design scheme of LEO satellite OFDM system timing synchronization, which uses another method to restructure the training symbols on the basis of the original H.Minn scheme, so as to propose a The new structure aims to eliminate the correlation peak of the timing position when performing the timing measurement of symbol synchronization, so as to solve the problem of timing ambiguity in the H.Minn scheme.

[0028] In the specific embodiment of the present invention, the new construction method adopted to the training symbols includes the following steps:

[0029] Step 1: Select an appropriate PN sequence (pseudo-random noise sequence) to construct training symbols. In this embodimen...

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Abstract

The invention provides a timing synchronization method in a low-orbit satellite communication system. The timing synchronization method is characterized by comprising the following steps: selecting longest linear feedback shift register sequences to construct a training symbol, wherein the training symbol has two front and back reverse parts, the total length is N, the front half part N / 2 is reverse to the back half part N / 2, and meanwhile two parts N / 4 in each N / 2 part form conjugate antisymmetry; further improving a time domain structure of the training symbol, so that the time domain structure becomes a dual conjugate antisymmetry structure; and calculating the improved training symbol according to a timing synchronization measurement function to obtain a time domain measurement result. By adoption of the method, related peak values of timing positions can be eliminated, no platform effect is generated, and meanwhile the sidelobe phenomenon is also well inhibited.

Description

technical field [0001] The invention relates to the technical field of low-orbit satellite communication systems, in particular to a timing synchronization method in the low-orbit satellite communication system. Background technique [0002] Satellite communication refers to the communication between two or more earth stations using artificial earth satellites as relay stations to forward or transmit radio waves between radio communication stations set up on the earth (including the ground, water surface and lower atmosphere). Satellite communication is a kind of space radio communication. Compared with other communication methods, satellite communication has the advantages of wide coverage, large communication capacity, long distance, not limited by geographical conditions, and stable and reliable performance. It is also compatible with optical fiber communication, digital microwave Together, communication has become the backbone of modern long-distance communication and ha...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2656H04L27/2662H04L27/2665
Inventor 马天鸣李世举姜泉江李光
Owner SHANGHAI ENG CENT FOR MICROSATELLITES
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