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A Gold Code Multiphase Parallel Generation Method

A multi-phase and phase technology, applied in the field of spread spectrum code synchronization, can solve the problems of long search time and achieve the effect of shortening the search time

Active Publication Date: 2020-05-12
XIAN INSTITUE OF SPACE RADIO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the code length of the C / A code of the GPS satellite is 1023. In the worst case, it needs to search 1023 times to find the correct code phase, which will inevitably require a long search time.

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  • A Gold Code Multiphase Parallel Generation Method
  • A Gold Code Multiphase Parallel Generation Method
  • A Gold Code Multiphase Parallel Generation Method

Examples

Experimental program
Comparison scheme
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Embodiment

[0052] Let the Gold code be the C / A code of the GPS signal, and the code length n is 1023. During the spread spectrum signal synchronization process, in order to speed up the C / A code phase search speed, the C / A code generator can be used to output 8 phases in parallel, under the premise that the phase delays of two adjacent channels are the same or similar (that is, to ensure Each search interval is evenly distributed), and the length of each search interval is determined to be 128 phases (128=1024 / 8), that is, the phase delay between two adjacent paths is 128. Therefore, the phase delays of each of the 8 parallel outputs of the C / A code relative to the initial moment are 0, 128, 256, 384, 512, 640, 768, and 896, respectively.

[0053] The generator polynomials of the two m-sequences of the Gold code are G 1 (x)=1+x 3 +x 10 , G 2 (y)=1+y 2 +y 3 +y 6 +y 8 +y 9 +y 10 . Therefore the two shift registers G 1 and G 2 The corresponding one-step state transition matrice...

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Abstract

The invention discloses a Gold code multi-phase parallel generation method. Firstly, according to the Gold code length and the number N of paths to be generated in parallel, the phase delay of each path relative to the initial time is determined, the one-step state transition matrix of the initial time of two shift registers of the Gold code is determined first. According to that phase delay i, the n-th row vector of the i-step state transition matrix of the two shift register of the Gold code is determined.The n-th line vector is multiplied by the contents of the initial time of the shift register to obtain the shift register phase output, and the Gold code after the phase delay i is obtained. The invention can simultaneously output the phases with different delays in parallel, so that the signal synchronization circuit can search the phase of the Gold code in section and in parallel, and the searching time of the phase of the Gold code is greatly shortened.

Description

technical field [0001] The invention relates to a spread spectrum code synchronization technology, in particular to a multi-phase parallel generation method of a Gold code. Background technique [0002] As a pseudo-random code, Gold code has the characteristics of low correlation, large number and good balance. It has been widely used in the field of mobile communication and satellite communication, and provides good spreading gain and multiple access characteristics for wireless signals. . [0003] At present, the Gold code is generally generated serially. In the synchronization of the spread spectrum signal using the Gold code, the signal synchronization circuit performs a serial search on the phase of the Gold code. When the Gold code length is longer, the code phase search time increases accordingly. For example, the code length of the C / A code of the GPS satellite is 1023. In the worst case, it needs to search 1023 times to find the correct code phase, which will inev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/00H04J13/10
CPCH04J13/0029H04J13/10
Inventor 聂少军勾潇薇吉欣张展骞尧解宁
Owner XIAN INSTITUE OF SPACE RADIO TECH