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Narrow-band satellite communication system

A satellite communication system and narrow-band technology, applied in the field of narrow-band satellite channel systems, can solve the problems of spectrum leakage, ignorance of inter-carrier interference elimination processing, influence, etc., achieve smooth modulation envelope, improve spectrum utilization, and speed up attenuation speed. Effect

Active Publication Date: 2019-04-30
SPACETY CO LTD (CHANGSHA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the interference source is not located on a certain subcarrier frequency, spectrum leakage will occur, and narrowband interference will affect all adjacent subcarriers
And it does not consider the cancellation of inter-carrier interference

Method used

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  • Narrow-band satellite communication system
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  • Narrow-band satellite communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The present invention provides a narrowband satellite communication system, which at least includes at least one communication satellite 1 and several base stations 2 communicating with each other. For example, if figure 1 As shown, the narrowband satellite communication system includes a communication satellite 1, a first base station 2a and a second base station 2b. The first base station 2a can send the received data signal to the communication satellite 1, and then relay it to the second base station 2b through the communication satellite 1. Similarly, the second base station 2b can also relay the data signal it receives to the first base station 2a through the communication satellite 1 . The first base station 2a and the second base station 2b may separately have their respective gateways, and all gateways may be communicatively coupled to each other through a common network.

[0043] preferred, such as figure 2 As shown, the base station 2 includes at least an...

Embodiment 2

[0061] This embodiment is a further improvement on Embodiment 1, and repeated content will not be repeated here.

[0062] See you again figure 1 , the first base station 2a can send the first signal to the communication satellite 1, and then relay the first signal to the second base station 2b through the communication satellite 1. When the second base station 2b transmits the second signal to the communication satellite, the second base station 2b can simultaneously receive the echo of the second signal and the first signal as a combined signal. Similarly, the first base station 2a can simultaneously receive the echo of the first signal and the second signal as a combined signal. The first base station 2a and the second base station 2b can eliminate the interference caused by the echo through the echo cancellation method, and the demodulation of the first signal and the second signal can be facilitated by canceling the echo. The first signal and the second signal are subjec...

Embodiment 3

[0071] This embodiment is a further improvement on the foregoing embodiments, and repeated content will not be repeated here.

[0072] preferred, such as Figure 8 As shown, the encoding processor 201 is also configured to encode the signal in the following manner:

[0073] S1: The BCH code generated after the signal is encoded by BCH and the transmitted information frame form an information subframe with set bits. In the case where the bit length of the information subframe does not meet the set bit length, the 0 code is supplemented. way to complement it.

[0074] Specifically, the a-bit signal can be encoded by BCH (b, a) to obtain a b-bit BCH code output, and the b-bit BCH code and the transmitted information frame form a c-bit information subframe. For example, b can be set to 31 and c can be set to 223.

[0075] Preferably, the generator polynomial of the BCH code can pass the formula g(x)=x 10 +x 9 +x 8 +x 6 +x 5 +x 3 +1 for representing that.

[0076] S2: The...

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Abstract

The invention discloses a narrowband satellite communication system. The system at least comprises a communication satellite and a base station, The communication satellite is configured to at least carry out interference suppression processing on the signals in the signal relay process so as to realize transmission of the signals among a plurality of base stations. the base station converts the received signals into a plurality of different radio frequency output frequencies so as to establish multi-channel transmission with the communication satellite, and the communication satellite is configured to respectively establish a first complex sine curve and a second complex sine curve and determine the frequency components of the signals so as to separate the frequency contents of the interference signals; Obtain a first processing signal based on the first complex sine curve and first-stage multiplication processing of the signal, and introduce inter-carrier interference; Eliminate theinterference signal according to a subcarrier frequency zero setting mode to obtain a second processing signal; And under the condition that the second processing signal is subjected to fast Fourier inverse transformation processing, inter-carrier interference is eliminated based on the second complex sine curve and second-stage multiplication processing of the second processing signal.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a narrow-band satellite channel system. Background technique [0002] The large path loss and low receiving power of satellite communication make it susceptible to interference from high-power narrowband signals, which increases the interference level after demodulation, which in turn leads to a decrease in the performance of the satellite communication system. A narrowband signal refers to a signal whose source signal bandwidth is much smaller than the center frequency of the carrier. In order to improve the quality of satellite communication, a series of narrow-band interference suppression measures based on time domain or frequency domain have been proposed. The basic idea of ​​using the frequency domain anti-narrowband interference method is: the main information contained in the signal is retained in the phase spectrum of the spectrum, and the amplitude spect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/71H04B7/185H04L25/03
CPCH04B1/7102H04B7/1851H04L25/03006
Inventor 杨峰任维佳杜志贵陈险峰
Owner SPACETY CO LTD (CHANGSHA)
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