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A hybrid spread spectrum communication method and device based on long and short codes

A hybrid spread spectrum, long and short code technology, applied in the field of satellite communications, can solve problems such as the inability to meet system requirements, and achieve the effects of avoiding aggravating multiple access interference, reducing the probability of conflict, and increasing confidentiality.

Active Publication Date: 2021-12-10
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the face of hundreds, thousands or even more important users of spacecraft and ground surface in the future, the current number of spread spectrum sequences can no longer meet the system requirements

Method used

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  • A hybrid spread spectrum communication method and device based on long and short codes
  • A hybrid spread spectrum communication method and device based on long and short codes
  • A hybrid spread spectrum communication method and device based on long and short codes

Examples

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Embodiment 1

[0038] In recent years, in the field of satellite communications, with the explosive growth of high-, medium-, and low-orbit spacecraft and important ground users, the network access of a large number of relay users has gradually become a technical problem that needs to be solved urgently in the field of relay satellite communications.

[0039] At present, the relay satellite communication system adopts the short message working system to transmit the user's access signaling information. In the face of hundreds, thousands or even more important relay users on the spacecraft and the surface in the future, the current number of spread spectrum sequences has exceeded It cannot meet the system requirements, and it is urgent to study a new spread spectrum system to solve the network access requirements of a large number of relay users. In addition, the low-orbit spacecraft needs full-time monitoring when it is in orbit. The low-orbit spacecraft periodically sends status short messag...

Embodiment 2

[0066] Corresponding to Embodiment 1 of the present invention, Embodiment 2 of the present invention also provides a hybrid spread spectrum communication device based on long and short codes, and the device includes:

[0067] The first spreading module is used for splicing link synchronization data and frame synchronization data into synchronization segment data, and performing spread spectrum processing on the synchronization segment data using a short code sequence;

[0068] The second spreading module is used for splicing frame header data, data field data and frame tail data into information segment data, and performing spread spectrum processing on the information segment data using a long code sequence;

[0069] The sending module is used for splicing the spread-spectrum synchronization segment data and the spread-spectrum information segment data before sending.

[0070] Applying the embodiment of the present invention, compared to the way in which the short code or the...

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Abstract

The embodiment of the present invention provides a hybrid spread spectrum communication method and device based on long and short codes. The method includes: splicing link synchronization data and frame synchronization data into synchronization segment data, and using short code sequences for the synchronization segment data Carry out spread spectrum processing; splicing frame header data, data field data and frame tail data into information segment data, and using long code sequences to perform spectrum spread processing on the information segment data; The information segment data is spliced ​​and sent. By applying the embodiment of the present invention, the user capacity of the system is effectively improved.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a hybrid spread spectrum communication method based on long and short codes. Background technique [0002] In a communication system, according to the Shannon formula, it can be seen that when the channel capacity is constant, the channel bandwidth and the SNR are interchangeable, that is, increasing the bandwidth can reduce the requirement for the SNR and make the useful signal The power is close to or even submerged under the noise power. Based on the above principles, spread spectrum communication is to exchange for a lower signal-to-noise ratio by increasing bandwidth. When the signal-to-noise ratio cannot be improved, the bandwidth can be increased to achieve the purpose of increasing the channel capacity. Spread spectrum is a broadband technology. Since spread spectrum occupies a wider frequency band, it seems to waste limited frequency resources. However,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7073H04B1/7103H04J13/00
CPCH04B1/7073H04B1/7103H04J13/0029H04J13/0077
Inventor 张霄姚艳军王烁章仁飞任伟龙贺超张靖胡树楷张正宇赵宇峰
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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