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Satellite communication system link adaptive-step-size power controlling method

A satellite communication system and link adaptive technology, applied in the field of satellite communication, to overcome deep fading and fast fading, improve signal quality, and realize self-adaptive uplink power control

Active Publication Date: 2013-01-30
SPACETY CO LTD (CHANGSHA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Combining the above two formulas, it can be seen that the power control command of the ground station can only adjust the transmission power (or signal amplification factor) with a fixed step size (Δ) up and down

Method used

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  • Satellite communication system link adaptive-step-size power controlling method
  • Satellite communication system link adaptive-step-size power controlling method
  • Satellite communication system link adaptive-step-size power controlling method

Examples

Experimental program
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Embodiment Construction

[0079] For the convenience of description, we assume the following application examples, such as Figure 5 Shown: The system includes a satellite, an earth station and a ground control center. The earth station continuously sends signals to the satellite for a period of time, and the ground control center implements power control on the earth station.

[0080] The power control algorithm based on adaptive step size adjustment is used in the ground control center to update the power amplification factor of the earth station at the next moment. Before the system is running, first clear the flag position to 0, and set the initial power amplification factor to Δ. The specific steps after the system is running are:

[0081] Step 1. Kalman filter estimates channel fading to form control command TPC.

[0082] Step 2. Write the current flag to the power control command counter.

[0083] Step 3. Compare the flag bit at the previous moment with the current flag bit:

[0084] (1) The...

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Abstract

The invention discloses a satellite communication system link adaptive-step-size power controlling method. The power controlling is changed by regulating a step size which is regulated by estimating channel and power controlling history based on a Kalman filter, and influences which are brought by deep fading and fast fading in a channel are eliminated. According to the method, a ground control center is introduced in a satellite communication system, current channel fading is estimated by using the Kalman filter, power magnification of the next moment is calculated according to a history power controlling and regulating instruction, and interferences such as an ambient environment can be rapidly sensed, so that the aim of adaptively controlling power to resist the interferences is fulfilled. The satellite communication system at least comprises a geostationary satellite, an earth station and the ground control center, wherein a signal carrier is transmitted between the earth station and the geostationary satellite; and one ground control center manages a plurality of neighboring earth stations, and transmits a power controlling instruction to the earth stations, and the influences which are brought by satellite-ground link deep fading and fast fading in a satellite access network are eliminated.

Description

technical field [0001] The invention relates to a method for controlling the self-adaptive step-size power of a satellite communication network link, in particular to a control method for adjusting transmission power based on satellite link channel conditions, and belongs to the technical field of satellite communication. Background technique [0002] Satellite communication is the radio communication carried out by multiple earth stations (including land, water surface and atmosphere) on the earth using artificial communication satellites in the air as relay stations. The communication satellite consists of several transponders, several antennas, position and attitude control, telemetry and command, and power supply subsystems. Its main function is to transmit signals from various earth stations. [0003] A number of phenomena can cause signal loss when transmitting through the Earth's atmosphere. These phenomena include: atmospheric absorption (gas effect), cloud attenuat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/22H04W52/36H04W84/06
Inventor 叶晓国董菲菲孙力娟肖甫王汝传邹志强刘林峰李鹏
Owner SPACETY CO LTD (CHANGSHA)
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