Signal transmission method applicable to satellite communication system

A technology of satellite communication system and signal transmission, which is applied in the field of signal transmission of satellite communication system, can solve problems such as incompatibility with ground wireless communication systems, and achieve the effect of improving design and implementation efficiency and good isolation

Inactive Publication Date: 2010-07-21
TSINGHUA UNIV
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Problems solved by technology

[0007] Today, the third-generation terrestrial wireless communication has begun to be widely put into operation, because of the difference in the communication syst...

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  • Signal transmission method applicable to satellite communication system
  • Signal transmission method applicable to satellite communication system
  • Signal transmission method applicable to satellite communication system

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Embodiment Construction

[0023] The following takes a satellite communication system compatible with TD-SCDMA system terminal equipment as an example to illustrate the different-frequency time-division signal transmission method proposed by the present invention. like figure 1 and image 3 As shown, the total length of the downlink frame of the system is 10 milliseconds, the number of user groups supported by the system is N=8, and the number of users included in each user group is 1.

[0024] When the user multiple access method adopts CDMA, combined with figure 1 and figure 2 , realizing the first embodiment of the method of the present invention comprises following concrete steps (wherein n=0,1,...,7):

[0025] 1) Initialize the system: set the downlink frequency from the satellite transponder to the user terminal as f1, and the uplink frequency from the user terminal to the satellite transponder as f2, which is different from f1; the satellite transponder uses time division multiplexing to dis...

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Abstract

The invention relates to a signal transmission method applicable to a satellite communication system, which belongs to the technical filed of mobile satellite communication. The invention is characterized in that the method comprises the following steps: setting the down frequency from a satellite transponder to a user terminal as f1, and setting the up frequency from the user terminal to the satellite transponder as f2 which is different from f1; adopting a time division multiplexing mode for distinguishing N different user groups by the satellite transponder, wherein each user group can contain a plurality of users; sequentially dividing a down link frame into N time slots to be distributed to users of corresponding user groups to use; setting the time intervals beyond the time slots ofthe down link frame occupied by the up link frame, and adopting a multiple access mode of CDMA or FDMA; after the up link frame to be transmitted to users positioned in f2 is received and processed by the satellite transponder, transmitting the up link frame to be transmitted to users to the user terminal in f1 at the corresponding time interval; and receiving the down link frame corresponding part positioned in f1 by the user terminal at the corresponding time interval. When in use, a time division switching switch realizes the switching between the receiving of the down link frame and the sending of the up link frame and the signal insulation.

Description

technical field [0001] The invention belongs to the technical field of mobile satellite communication, and relates to a signal transmission method suitable for a satellite communication system. Background technique [0002] The satellite mobile communication system, its biggest feature is to use the multiple address transmission mode of satellite communication to provide global users with large-span, large-scale, long-distance roaming and mobile and flexible mobile communication services. Extended, it has unique advantages in communication in remote areas, mountainous areas, islands, disaster-stricken areas, ocean-going ships and long-distance aircraft. It can cover the whole world, and can solve mobile communication services in sparsely populated and communication-underdeveloped areas, and is an important part of global personal communication. Due to these unique advantages of satellite communication, the development of satellite communication has extremely important strat...

Claims

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Application Information

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IPC IPC(8): H04B7/204
Inventor 赵明陈翔周世东王京何飞秦浩浩
Owner TSINGHUA UNIV
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