Method and device for synchronously capturing pseudo codes in real time

A real-time synchronization and synchronous capture technology, applied in the field of pseudo-code capture, can solve the problem that the receiving end is difficult to capture in real time, and achieve the effect of increasing the capture success rate and reducing the probability of wrong capture and missed capture

Inactive Publication Date: 2014-09-24
XIDIAN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

However, under the current technical conditions, if a single pseudo-code with a long period is used for spreading, it is difficult for the receiving end to achieve real-time capture

Method used

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  • Method and device for synchronously capturing pseudo codes in real time
  • Method and device for synchronously capturing pseudo codes in real time

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Embodiment Construction

[0024] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0025] Reference figure 1 , The method of synchronous acquisition pseudo code of the present invention is carried out as follows:

[0026] Step 1. The sender generates a synchronization sequence and sends it

[0027] The sender adopts a period of N 1 The first pseudocode P 1 Spread the sync header information once, using a period of N 2 Second pseudocode P 2 Perform secondary spreading on the sync header information and generate a length of N 1 *N 2 The sender synchronizes the sequence and sends it. The pseudo code used by the receiver and the sender are the same, which are the first pseudo code P 1 And the second pseudocode P 2 .

[0028] Step 2. The receiving end receives the signal and uses the second pseudo code P 2 Perform a de-expansion:

[0029] 2.1) The receiving end inputs a received signal sample to a length of N 2 , And mark the signal sampl...

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Abstract

The invention discloses a method and a device for synchronously capturing pseudo codes in real time and mainly aims to solve the problem that real-time capture of long-period pseudo codes is difficult in the prior art. The method comprises the following steps: first, a synchronous head is spectrum-spread by adoption of a first pseudo code and a second pseudo code to generate a synchronization sequence, and the synchronization sequence is transmitted; second, a receiving end de-spreads a received signal to obtain segment correlation values and stores the segment correlation values; third, the segment correlation values are sequentially extracted and multiplied by the second pseudo code to obtain part of a correlation value sequence; fourth, modulo operation is performed on the sequence after FFT operation, the peak of the module value is selected and compared with a set threshold, the second pseudo code is successfully captured if the peak is greater than or equal to the threshold, or the method returns to the second step until the second pseudo code is synchronously captured; and fifth, the first half of a superposition value and the second half of the superposition value of the part of correlation value sequence are compared, synchronous capture succeeds if the two are approximately equal, or synchronous capture fails. The method and the device of the invention has the advantages of being capable of capturing long-period pseudo codes in real time, and can be used for real-time synchronous capture in burst communication.

Description

Technical field: [0001] The present invention belongs to the field of communication technology, and in particular relates to a pseudo-code acquisition method, which can be used for real-time synchronous acquisition of received signals by the receiving end in a spread spectrum communication system, so as to improve the success rate of synchronous acquisition of the system under low signal-to-noise ratio and reduce The probability of missed capture and wrong capture. Background technique: [0002] The so-called synchronization acquisition refers to the initial synchronization process of receiving system signals. For the DSSS system, the initial synchronization process includes two parts: pseudo code synchronization and carrier synchronization. The receiver can ensure the correct reception of data only after the synchronization sequence is correctly captured. [0003] Burst communication is a kind of covert communication. For burst communication, real-time capture is crucial, and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7075
Inventor 孙永军周茹贾翠园何家杰刘晓轩
Owner XIDIAN UNIV
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