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Method and system for capturing multi-user burst spread spectrum signal of asynchronous communication system

A burst spread spectrum signal, asynchronous communication technology, applied in the direction of transmission system, electrical components, etc., can solve the problems of fast acquisition of burst signals, long acquisition time, etc., to achieve fast acquisition speed, improve cumulative signal noise the effect of

Active Publication Date: 2021-08-06
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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Problems solved by technology

This acquisition method adopts the method of code phase serial search, which has a simple structure, but it takes a long time to acquire and cannot meet the needs of rapid acquisition of burst signals.

Method used

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  • Method and system for capturing multi-user burst spread spectrum signal of asynchronous communication system
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  • Method and system for capturing multi-user burst spread spectrum signal of asynchronous communication system

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Embodiment Construction

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0051] like figure 1 As shown, this embodiment provides a multi-user burst spread spectrum signal acquisition method in an asynchronous communication system, including the following steps:

[0052] Step 1. Carrier / code dynamic cancellation

[0053] Compensate for the Doppler dynamics of the carrier and code of the received signal,

[0054] Step 2. Cache

[0055] The digital sign...

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Abstract

The invention provides a method for capturing a multi-user burst spread spectrum signal of an asynchronous communication system, and aims to reduce the overhead brought by capturing a synchronous head, and capture needs to be completed as short as possible at the beginning of a burst signal. Therefore, the system adopts a carrier-code full parallel correlation method to capture, and adopts a method of combining multi-bit coherent accumulation with multiple non-coherent accumulation to divide a carrier Doppler interval into a plurality of different subcarrier intervals in order to improve the accumulated signal-to-noise ratio, and parallel capture is carried out in each subcarrier interval, and a plurality of users with different code phases can be identified through duplicate removal.

Description

technical field [0001] The invention relates to the field of burst signal processing, in particular to a method and system for capturing multi-user burst spread spectrum signals in an asynchronous communication system. Background technique [0002] With the popularity of satellite applications, satellite IoT applications based on burst signals will gradually prevail. In order to effectively reduce interference and reduce the transmit power spectral density to the surface, the use of spread spectrum communication has gradually become one of the mainstream communication methods. At present, in most satellite communication networks, a synchronous communication method is adopted, that is, multiple users and satellites are in a synchronized state, and the system divides different time slots for different users, and each user transmits in its own independent time slot. Signals, so that there is no superposition of multiple user signals at the same time at the ground receiving end...

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Application Information

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IPC IPC(8): H04B1/7087H04B1/7093
CPCH04B1/7087H04B1/7093
Inventor 姚艳军赵宇峰顾何方王烁任伟龙黄蕾章明明张正宇王昕张霄
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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