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System for coexistence of multiple satellite mobile communication systems

A satellite mobile communication, multi-system technology, applied in the field of satellite mobile communication multi-system coexistence systems, can solve problems such as low probability of design capacity and uneven business, and achieve the effect of solving key problems

Inactive Publication Date: 2017-05-03
BEIJING XINWEI TELECOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in different satellite mobile communication systems, there is a phenomenon that the service is uneven and the probability of reaching the design capacity is relatively low, which creates conditions for the use of spectrum sensing technology to find frequency usage holes in real time and dynamically

Method used

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  • System for coexistence of multiple satellite mobile communication systems
  • System for coexistence of multiple satellite mobile communication systems
  • System for coexistence of multiple satellite mobile communication systems

Examples

Experimental program
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Embodiment 1

[0036] At present, the existing satellite mobile communication system has more than GMR-1 or GMR-2 protocol system. This protocol adopts FDMA / TDMA multiple access mode, and its C / N requirement is generally higher than 5dB. Let the existing satellite mobile communication system be system A, and let the new system that needs to coexist with system A be system B. The spectrum of System A is as figure 1 shown. In this embodiment, a broadband spread spectrum method is adopted to superimpose a signaling signal of System B (indicated by a dotted line) transmitted in a spread spectrum mode with a low power spectral density on the spectrum of System A, and the spectrum after the superimposition of the two signals figure 2 shown.

[0037] According to the radio regulations formulated by the ITU, as long as the superimposed signal power does not exceed 6% of the thermal noise, it is regarded as the allowable signal power that does not cause interference to the original system A. That...

Embodiment 2

[0042] The largest satellite mobile communication system currently covering the world is Inmarsat. According to the ITU radio regulations, the frequency bands that can be used are: ground to satellite 1626.5-1660.5MHz, satellite to ground: 1525-1559MHz; In addition, Inmarsat newly expanded in WRC-03 The ground-to-satellite 1668-1675MHz, and the satellite-to-ground 1518-1525MHz frequency bands have also launched satellites. In this case, the new satellite mobile communication system faces the dilemma of no frequency resources available to achieve global coverage. Taking the downlink design from the satellite to the ground as an example, the actual available frequency resources are 1518-1559MHz, with a total bandwidth of 41MHz.

[0043] Let the Inmarsat satellite mobile communication system be A, and the satellite mobile communication system that intends to coexist with Inmarsat in the same frequency band be B.

[0044] The signaling of system B adopts 512-fold spread spectrum....

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Abstract

The present invention provides a system for coexistence of multiple satellite mobile communication systems. A satellite mobile communication system B is set at the same band of a satellite mobile communication system A. The method comprises the steps that the satellite mobile communication system B builds a transmission channel by using a broadband spread spectrum technology; a communication signal between a satellite and a ground terminal and spectrum sensing results of a forward channel and a reverse channel are transmitted by using the transmission channel; and spectrum resources are configured or adjusted in real time by using the communication signal according to the spectrum sensing results. Through adoption of the method, the newly built satellite mobile communication system and an existing satellite mobile communication system can coexist under the condition of no harmful interference, so that a major problem of building of the new system is solved.

Description

technical field [0001] The invention relates to the field of satellite mobile communication, in particular to a system in which multiple satellite mobile communication systems coexist. Background technique [0002] Spectrum resources suitable for global satellite mobile communications are very limited. With the increase in demand for satellite mobile communications, the contradiction of spectrum resource shortage has become increasingly prominent, and has even become the main bottleneck restricting the development of satellite mobile communications. Most of the existing satellite mobile communication system designs adopt the on-board radio frequency forwarding mode. Although this method simplifies the design of the space segment, due to the single signal processing method, the satellite mobile communication system can only be deployed in the way of monopolizing frequency resources. . Iridium is the only low-orbit mobile communication constellation system that uses on-board ...

Claims

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Application Information

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IPC IPC(8): H04B7/185
CPCH04B7/1853H04B7/18539
Inventor 蒋伯峰郑磊李自闯周雅新
Owner BEIJING XINWEI TELECOM TECH