CPFSK demodulation baseband implementation method

A technology of CPFSK and its implementation method, which is applied in the direction of modulated carrier system, phase-modulated carrier system, digital transmission system, etc., can solve the problem that the code rate cannot meet the requirements of high-speed PCM data transmission, and achieve low cost, strong anti-interference ability, Apply a wide range of effects

Pending Publication Date: 2020-11-10
北京融为科技有限公司
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AI Technical Summary

Problems solved by technology

With the actual needs of range telemetry, the 2Mbps code rate bottleneck can no longer meet the transmission requirements of high-speed PCM data

Method used

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  • CPFSK demodulation baseband implementation method
  • CPFSK demodulation baseband implementation method
  • CPFSK demodulation baseband implementation method

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Embodiment Construction

[0063] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

[0064] According to an embodiment of the present invention, a baseband implementation method for CPFSK demodulation is provided.

[0065] like Figure 1-Figure 3 Shown, according to the CPFSK demodulation baseband implementation method of the embodiment of the present invention, comprises the following steps:

[0066] Step S1, pre-obtaining the CPFSK signal as the intermediate frequency signal IF, determining to perform calculations on the length of N=2n+1 symbols, and determining the nth symb...

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Abstract

The invention discloses a CPFSK demodulation baseband implementation method, which relates to the technical field of communication modulation, and comprises the following steps: obtaining a CPFSK signal as an intermediate frequency signal IF, determining that operation is carried out on N = 2n + 1 symbol lengths, and judging the nth symbol in the middle; collecting CPFSK signals on N symbol lengths, calibrating the polarity of the first symbol, and obtaining the carrier initial phase of the ith symbol on the current length; performing integral operation on the obtained transmission symbol sequence A, and obtaining an intermediate symbol an + 1 to serve as judgment of a received waveform intermediate symbol; obtaining two paths of signals of a normalized signal and pass through a low-pass filter to obtain an in-phase component and a normal-phase component respectively. The method has high anti-interference capability for amplitude and phase distortion caused by multipath fading, is simple, low in cost and high in speed telemetry demodulation, can remarkably reduce the bit error rate and reduce the demodulation threshold, and is wide in application range.

Description

technical field [0001] The invention relates to the technical field of communication modulation, in particular to a method for realizing CPFSK demodulation baseband. Background technique [0002] Modulation plays an important role in communication systems. The function of modulation is to move the frequency spectrum of the modulation information from low frequency to high frequency, so as to be suitable for channel transmission. Correspondingly, the demodulation process is required at the receiving end to restore the modulated information, so demodulation is an important technology that affects the performance of the communication system. [0003] The demodulation method is divided into non-coherent demodulation and coherent demodulation according to the standard of whether carrier recovery is required. Coherent demodulation needs to extract and restore the carrier information through the phase-locked loop during demodulation, and demodulate the modulation information thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/22H04L27/20
CPCH04L27/22H04L27/2003
Inventor 不公告发明人
Owner 北京融为科技有限公司
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