Method for suppressing adjacent satellite interference in satellite communication system

A technology of satellite communication system and adjacent satellite, which is applied in the field of satellite communication, can solve the problems of system capacity reduction, difficult to achieve suppression of satellite communication system, and reduce the off-axis EIRP density of ground station antenna, so as to save channel resources and improve adjacent satellite interference , The effect of saving time-frequency channel resources

Inactive Publication Date: 2017-11-10
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The use of spread spectrum technology can effectively reduce the off-axis EIRP density of ground station antennas, however, the system capacity is also reduced
Therefore, in the existing method, it is difficult to achieve the effect of suppressing the adjacent satellite interference of the satellite communication system without making major adjustments to the existing MF-TDMA system and without sacrificing the system capacity too much

Method used

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  • Method for suppressing adjacent satellite interference in satellite communication system
  • Method for suppressing adjacent satellite interference in satellite communication system
  • Method for suppressing adjacent satellite interference in satellite communication system

Examples

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Comparison scheme
Effect test

Embodiment 1

[0051] In this embodiment, the antenna apertures of ground station 1 and ground station 2 are D 1 = 1.2m, D 2 =0.8m, the transmission rate of both parties is R 1 = R 2 =9.6Kbps, transmission time T=1.25s. System uplink frequency f u =14.2GHz, downlink frequency f d =11.9GHz, time slot length Δ=0.5ms;

[0052] Calculate the MCS order of both parties;

[0053] n 1 =2.00, η 2 =1.00

[0054] Therefore, when non-orthogonal multiple access is not introduced, the bandwidth occupied by both parties is

[0055]

[0056]

[0057] Utilize the method for suppressing adjacent star interference provided by the present invention, the steps are as follows figure 1 Shown; Calculate the spreading ratio of both sides as:

[0058] k 1 = 2,k 2 = 1

[0059] Calculate the bandwidth and time slot requirements of both parties, respectively:

[0060] w=9.6kHz, n=2500

[0061] In non-orthogonal multiple access, the bandwidth occupied by both parties is the same as the time slot requ...

Embodiment 2

[0064] In this embodiment, the antenna apertures of ground station 1 and ground station 2 are D 1 = 0.6m, D 2 =2.4m, the transmission rate is R 1 = 64Kbps, R 2 =512Kbps, transmission time T=23.5ms. System uplink frequency f u =14.2GHz, downlink frequency f d =11.9GHz, time slot length Δ=0.5ms;

[0065] Calculate the MCS order of both parties:

[0066] n 1 =0.67, η 2 =2.25

[0067] When non-orthogonal multiple access is not introduced, ground station 1 needs to double the spectrum in order to meet the ITU constraints, so the bandwidths occupied by both parties are:

[0068]

[0069] Utilize the method for suppressing adjacent star interference provided by the present invention, the steps are as follows figure 1 Shown; Calculate the spreading ratio of both sides as:

[0070] k 1 = 3,k 2 = 1

[0071] Calculate the bandwidth and time slot requirements of both parties as

[0072] w=288kHz, n=47

[0073] figure 2 It is a schematic diagram of saving channel reso...

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Abstract

The invention discloses a method for suppressing adjacent satellite interference in a satellite communication system. The method for suppressing adjacent satellite interference in the satellite communication system comprises the following steps: when ground stations communicating with each other exists in the communication network system, marking the two communication parties communicating with each other in the system as a ground station 1 and a ground station 2 respectively; forming the non-orthogonal multiple access through making the ground station 1 and the ground station 2 occupy the same time slot and frequency resource, and performing resource optimal distribution; wherein the resource optimal distribution comprises calculating and obtaining the modulation coding scheme order, the spread spectrum ratio, the communication bandwidth and the slot number respectively according to the transmission rate of the two communication parties, and allocating idle carriers and time slot resources to make the ground station 1 and the ground station 2 occupy the same carriers and time slot resources to send, so as to save the time frequency channel resource; and reducing the off-axis radiation intensity through the modulation coding scheme and the spread spectrum ratio selection method; therefore, the effects that the interference requirements of the adjacent satellite is met and the time and frequency resources are saved compared with direct spread spectrum are achieved.

Description

technical field [0001] The present invention relates to the technical field of satellite communication, in particular to a method for suppressing interference from adjacent satellites in a satellite communication system, and provides resource optimization allocation in an MF-TDMA (Multi-Frequency Time Division Multiple Access) system The method not only makes the adjacent satellite interference meet the specification requirements, but also achieves the purpose of saving channel resources. Background technique [0002] The multi-frequency time division multiple access (MF-TDMA) system is a multiple access method that combines the advantages of FDMA (Frequency Division Multiple Access, frequency division multiple access) and TDMA (Time Division Multiple Access, time division multiple access) technologies. Divide users in two-dimensional space in time domain and frequency domain, and assign time slots and carrier frequency points to each user. It has many advantages such as fle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185
CPCH04B7/18513
Inventor 朱锦华罗武马宇红周龙飞
Owner PEKING UNIV
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