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Uplink signal timing synchronous prediction compensation method used for satellite mobile communication

A satellite mobile communication and signal timing technology, which is applied in the field of satellite communication, can solve problems such as large timing synchronization deviation, large round-trip transmission delay, and reduced system performance, so as to achieve good synchronization performance and improve performance.

Inactive Publication Date: 2011-11-02
PEKING UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the satellite mobile communication system, especially in the geostationary orbit satellite (GEO) system based on transparent forwarding, the round-trip transmission delay between the terminal and the gateway station is extremely long (about 600ms), so even if the traditional ground The synchronization technology achieves the synchronization between the satellite and the terminal, and the timing synchronization adjustment command periodically measured and sent by the satellite side will also produce a lag of about 600ms
When the terminal is in high-speed motion, the distance between it and the satellite will constantly change, so the round-trip transmission delay of the signal will also change constantly, resulting in a large timing synchronization deviation, which will greatly reduce the performance of the system

Method used

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  • Uplink signal timing synchronous prediction compensation method used for satellite mobile communication
  • Uplink signal timing synchronous prediction compensation method used for satellite mobile communication
  • Uplink signal timing synchronous prediction compensation method used for satellite mobile communication

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Embodiment Construction

[0022] The present invention will be further described below through specific examples.

[0023] Take the satellite mobile communication system compatible with the TD-SCDMA standard as an example: the signal rate is 80kbps, QPSK modulation is adopted, and the spreading factor is 16. According to the stipulations of the 3GPP TD-SCDMA standard, the minimum adjustment step size of the system uplink synchronization is consistent with the system timing synchronization accuracy, which is 1 / 8 of the chip width, that is, 97.65625ns. In order to simplify the calculation, the following approximation is taken as 100 ns, so in this method, the minimum step size of the satellite gateway station for each compensation adjustment is also 100 ns.

[0024] Assuming that the earth is a standard sphere, the propagation speed of electromagnetic waves C=3×10 8 m / s, the GEO satellite and the terminal user are at the same longitude, and the terminal moves at a constant speed from 39.92° north latitu...

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Abstract

The invention provides an uplink signal timing synchronous prediction compensation method used for satellite mobile communication. The uplink signal timing synchronous prediction compensation method used for the satellite mobile communication comprises the following steps of: sending an uplink signal to a satellite end by a ground terminal and forwarding the uplink signal to a gateway station through a satellite; detecting a timing synchronous offset value and selecting a reasonable prediction algorithm to predict additional timing synchronous offset occurred soon because the terminal moves in the next detection period according to the detection and history detection results, by the gateway station; calculating the compensation value accordingly and notifying the ground terminal through a downlink synchronous adjustment instruction; and carrying out relevant compensation adjustment on sending time of an uplink signal of the terminal per se by the terminal after receiving the adjustment instruction so that the timing synchronous offset can be controlled in a smaller threshold all the time to ensure synchronous performance of a system. The uplink signal timing synchronous prediction compensation method used for the satellite mobile communication can be used for the next generation of mobile satellite communication system compatible with 3G / B3G (3rd generation / beyond 3rd generation) standards, and a workable solution for the problem of timing synchronous offset caused by long delay in a satellite communication system is provided.

Description

technical field [0001] The invention relates to an uplink signal timing synchronization prediction and compensation method for satellite mobile communication, which belongs to the technical field of satellite communication. Background technique [0002] The satellite mobile communication system has many advantages such as wide coverage, not limited by geographical environment and climatic conditions, and has become a key field in the development of modern communication technology, and gradually complements the terrestrial cellular mobile communication system. important means. With the global application of the third-generation mobile communication system and the maturity of the fourth-generation mobile communication standard proposal, in recent years, countries such as the United States, Europe, and Japan have begun research on the next-generation satellite mobile communication system and technology, and focus on Put it on the integration of terrestrial cellular mobile comm...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04W84/06H04B7/185
Inventor 任术波马铭栾西程宇新吴建军
Owner PEKING UNIV
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