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Spreading code frequency and data rate non-coherence bit alignment method

A spread spectrum code frequency and bit synchronization technology, applied in the field of bit synchronization, can solve problems such as phase instability

Active Publication Date: 2016-01-27
BEIJING AEROSPACE AUTOMATIC CONTROL RES INST +1
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Problems solved by technology

At present, the frequency of the spreading code is coherent with the data rate (the frequency of the spreading code is an integer multiple of the data rate, and the edge of each data code bit coincides with the edge of the first chip of the spreading code) bit synchronization method It is mature. When the two are not coherent, the existing coherent bit synchronization method cannot adapt to this situation because the phase of the two is not fixed.

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  • Spreading code frequency and data rate non-coherence bit alignment method
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  • Spreading code frequency and data rate non-coherence bit alignment method

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Embodiment Construction

[0036] Such as figure 1 As shown, it is a flow chart of the bit synchronization method that the spread spectrum code frequency and the data rate are disjoint realized by the present invention, and all need to be called at each point in time when bit synchronization is required. figure 1 process shown. Here we choose a bit synchronization verification system in which the frequency of a spreading code and the data are not coherent, and implement it in hardware DSP as an example to illustrate.

[0037] (1) Determine the data sampling period T according to the characteristics of the signal spreading code, and at the same time determine the number of sampling periods N in a data bit length, construct a data buffer area with a size of 2N and initialize it to 0.

[0038] Considering that the signal can communicate normally only when the signal-to-noise ratio is above 10dB, and considering the amount of calculation comprehensively, the value range of N is calculated as follows: 4≤N≤8...

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Abstract

Provided is a spreading code frequency and data rate non-coherence bit alignment method which can determine the overturning and jumping position of a data bit based on the I phase integral accumulated values in the data bit. The method calculates the I-phase accumulated values in a plurality of continuous sampling periods after the signal demodulation and dispreading, constructs four groups of observed quantities by means of the accumulated value result, and determines the overturning and jumping position of the data bit based on the positivity and negativity and the amplitude relation of the observed quantities. The method is simple and convenient in calculation, and is a rapid bit alignment method for signals with non-coherent spreading code frequency and data rate.

Description

technical field [0001] The invention relates to a bit synchronization method in which frequency of spreading code and data rate are not correlated. Background technique [0002] In the spread spectrum communication system, after the signal is captured and tracked, it needs to undergo bit synchronization processing to correctly extract the data bit information, so the bit synchronization technology is the key technology of spread spectrum communication. At present, the frequency of the spreading code is coherent with the data rate (the frequency of the spreading code is an integer multiple of the data rate, and the edge of each data code bit coincides with the edge of the first chip of the spreading code) bit synchronization method It has matured. When the two are not coherent, the existing coherent bit synchronization method cannot adapt to this situation because the phase of the two is not fixed. To solve this type of problem, a bit synchronization method in which the freq...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7073H04L12/861
Inventor 崔莹莹陈怡韩琦贾为民葛飞刘昌杰
Owner BEIJING AEROSPACE AUTOMATIC CONTROL RES INST