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A narrowband multi-channel satellite communication system

A satellite communication system and multi-channel technology, which is applied in the field of wireless communication, can solve problems such as spectrum leakage, influence, and unconsidered inter-carrier interference elimination processing, etc., and achieve the effects of smooth modulation envelope, faster attenuation speed, and improved spectrum utilization

Active Publication Date: 2020-05-15
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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  • A narrowband multi-channel satellite communication system
  • A narrowband multi-channel satellite communication system
  • A narrowband multi-channel satellite communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The present invention provides a multi-channel satellite communication system, which at least includes at least one narrowband satellite 1 and several ground stations 2 communicating with each other. For example, if figure 1 As shown, the multi-channel satellite communication system includes a narrowband satellite 1, a first ground station 2a and a second ground station 2b. The first ground station 2a can send the received data signal to the narrowband satellite 1, and then relay it to the second ground station 2b through the narrowband satellite 1. Similarly, the second ground station 2b can also relay the data signal it receives to the first ground station 2a through the narrowband satellite 1 . The first ground station 2a and the second ground station 2b may individually have their respective gateways, and all gateways may be communicatively coupled to each other through a common network.

[0044] preferred, such as figure 2 As shown, the ground station 2 include...

Embodiment 2

[0062] This embodiment is a further improvement on Embodiment 1, and repeated content will not be repeated here.

[0063] See you again figure 1 , the first ground station 2a can send the first signal to the narrowband satellite 1, and then relay the first signal to the second ground station 2b through the narrowband satellite 1. When the second ground station 2b transmits the second signal to the narrowband satellite, the second ground station 2b can simultaneously receive the echo of the second signal and the first signal as a combined signal. Similarly, the first ground station 2a can simultaneously receive the echo of the first signal and the second signal as a combined signal. The first ground station 2a and the second ground 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 will ...

Embodiment 3

[0072] This embodiment is a further improvement on the foregoing embodiments, and repeated content will not be repeated here.

[0073] preferred, such as Figure 8 As shown, the encoding module 201 is also configured to encode the signal in the following manner:

[0074] 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.

[0075] 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.

[0076] 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.

[0077] S2: The in...

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Abstract

Provided is a narrow-band multi-channel satellite communication system, a signal is transmitted to at least one narrow-band satellite through a ground station, the ground station at least comprises anencoding module and a first modulation module, and the ground station is configured to perform encoding processing on the signal to obtain an encoded signal; the first modulation module is configuredto perform serial-parallel conversion processing on the coded signal to generate a first branch code stream and a second branch code stream; wherein the first branch code stream executes delay processing to enable the first branch code stream and the second branch code stream to be spaced from each other by a set code element period; wherein the first branch code stream sequentially executes first-stage filtering processing and first-stage modulation processing to obtain a first modulation signal, and the second branch code stream sequentially executes first-stage filtering processing and second-stage modulation processing to obtain a second modulation signal; wherein the first modulation signal and the second modulation signal are jointly subjected to second-stage modulation processing to obtain a third modulation signal, and the third modulation signal is subjected to second-stage filtering processing to complete modulation processing.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a narrow-band multi-channel satellite channel system. Background technique [0002] Space spectrum resources are limited, and the increase in the data transmission rate of satellite communications is at the expense of information bandwidth, which continuously has a huge impact on spectrum resources. In order to avoid multiple transmitters transmitting signals in the same frequency band and causing the same frequency signals to interfere with each other, the receiver cannot adjust the correct information. In order to solve the existing problems, the spectrum fixed allocation mode is often adopted, that is, the right to use the fixed frequency band is assigned to a specific user and other users or services are prohibited from accessing the allocated spectrum. The fixed frequency band allocation model is very effective in solving the interference caused by radio use....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/185H04L25/03
Inventor 陈险峰杨峰任维佳杜志贵
Owner SPACETY CO LTD (CHANGSHA)
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