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Method and device for synchronously capturing pseudocode in real time

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

Inactive Publication Date: 2016-04-27
XIDIAN UNIV
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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 pseudocode in real time
  • Method and device for synchronously capturing pseudocode in real time

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Embodiment Construction

[0024] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] refer to figure 1 , to the synchronous capture pseudo code method of the present invention, carry out as follows:

[0026] Step 1, the sender generates a synchronization sequence and sends

[0027] The sender uses a period of N 1 The first pseudocode of P 1 Perform a frequency spread on the synchronization header information, using a period of N 2 The second pseudocode P 2 Carry out secondary spread spectrum on the synchronization header information, and the generated length is N 1 *N 2 The sending end synchronizes the sequence and sends it, the receiving end and the sending end use the same pseudo-code, respectively the first pseudo-code P 1 and the second pseudocode P 2 .

[0028] Step 2, the receiver receives the signal and uses the second pseudocode P 2 Perform a despreading:

[0029] 2.1) The receiving end inputs a receiv...

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

Claims

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Application Information

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Patent Type & Authority Patents(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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