Frequency reuse method for multi-beam satellite mobile communication down link

A satellite mobile communication and downlink technology, which is applied in the field of downlink frequency multiplexing method design in multi-beam satellite mobile communication systems, and can solve problems such as inability to eliminate inter-beam interference

Inactive Publication Date: 2014-05-14
PEKING UNIV
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Problems solved by technology

[0008] Although the frequency reuse technology can reduce the inter-beam interference by increasing the frequency reuse factor, it can only treat the inter-beam interference as noise and cannot eliminate the inter-beam interference

Method used

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  • Frequency reuse method for multi-beam satellite mobile communication down link
  • Frequency reuse method for multi-beam satellite mobile communication down link
  • Frequency reuse method for multi-beam satellite mobile communication down link

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Embodiment Construction

[0025] Consider a satellite communication system with K beams, each beam has N users, resource scheduling is to divide all users (a total of K×N) into N groups, and each group contains K users from different beams. The basic idea of ​​the resource scheduling algorithm is to select one user from each of the K beams, group the K users into a group, repeat N times in total, and set the frequency point f i (i∈[1,N]) is assigned to the user merged for the ith time. If the number of users in a certain beam is less than that of other groups, if it is found that the users in this beam have been grouped during grouping, this beam will be skipped. If there are many users in a certain beam, the extra users use frequency points on the reserved frequency band to transmit downlink signals.

[0026] Denote the central beam as beam 1 and number the other beams in spiral order outward from the central beam. use Record the unassigned users in beam k before the ith merging process (k∈[1,K],...

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Abstract

The invention discloses a frequency reuse method for a multi-beam satellite mobile communication down link. The frequency reuse method for the multi-beam satellite mobile communication down link comprises the steps that (1) users in the down link of a multi-beam satellite mobile communication system are divided into N groups, each group comprises K users from different beams, and the users of the same group meet the requirement for the largest user separation distance, wherein K is the total number of the beams of the multi-beam satellite communication system; (2) different frequency points are distributed to all groups of users respectively, and each group of users send down link signals at the corresponding distributed frequency point; (3) a ground central station monitors the signal to interference and noise ratio of received signals of the users, and if the signal to interference and noise ratio of the received signals of one user is smaller than a threshold value, a reserved frequency point is distributed to the user so that the down link signals can be sent, and the user conducts pre-coding on the sent signals through the distributed frequency point and then sends the sent signals otherwise. By the adoption of the frequency reuse method for the multi-beam satellite mobile communication down link, the problem that the pre-coding interference elimination method is poor in adaptability in the satellite communication system is solved, and the frequency utilization rate and the system capacity of the satellite communication system can be effectively improved.

Description

technical field [0001] The invention relates to a multi-beam satellite communication system, in particular to a design of a downlink frequency multiplexing method in a multi-beam satellite mobile communication system, and belongs to the technical field of communication. Background technique [0002] In a mobile communication system, the system capacity is limited by limited spectrum resources [Lee W C Y. Overview of cellular CDMA [J]. Vehicular Technology, IEEE Transactions on, 1991, 40(2): 291-302.]. With the continuous development of satellite mobile communication, the demand for spectrum resources is also increasing. However, the S-band resources allocated to satellite mobile communication are only 1980MHz-2010MHz uplink and 2170MHz-2200MHz downlink. Spectrum resources have become tense. Therefore, it is necessary to study the frequency planning technology in the satellite mobile communication system. Due to the many differences between the satellite environment and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04H04W16/14H04B7/185H04L1/00H04B7/06
Inventor 赫祎诺吴建军郑玮任术波程宇新
Owner PEKING UNIV
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