FSK/GFSK Phase Demodulation with Average Phase Difference Removal
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Solution Overview
Problem
Existing phase domain demodulation technologies for FSK/GFSK signals have low performance due to the lack of phase matching filter groups and high complexity, which is not as effective as complex domain demodulation methods.
Innovation Solution
A method and device for FSK/GFSK demodulation that determines a digital information vector group and a corresponding phase matching vector group within a specific duration, calculates an average phase difference, and uses a phase matching degree measurement function to improve phase matching accuracy, thereby enhancing demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If phase domain demodulation is used to reduce system complexity, then complexity is reduced, but demodulation performance deteriorates
Solution Approach 1:
The patent segments the demodulation process into distinct functional modules: phase difference calculation unit, phase matching filter group, and phase matching degree calculation unit. This segmentation allows each module to perform a specific function efficiently, maintaining low complexity while improving overall performance through specialized processing stages.
Solution Approach 2:
The patent introduces a phase matching filter group as an intermediary between the received signal and the demodulation decision. This filter group acts as a mediator that enhances the matching between the received phase sequence and reference phase sequences, thereby improving demodulation performance without significantly increasing system complexity.
2Measurement precision
If phase matching accuracy is improved by removing average phase difference, then measurement precision is improved, but calculation complexity increases
Solution Approach 1:
The patent performs preliminary calculation of the average phase difference before the phase matching process. By calculating the average phase difference in advance and removing it from the phase sequences, the patent prepares the data for more accurate matching while organizing the calculation steps to minimize overall complexity.
Solution Approach 2:
The patent changes the parameter representation by removing the average phase difference component from the phase sequences. This parameter transformation simplifies the phase matching process by eliminating a systematic offset, thereby improving accuracy without requiring complex compensation mechanisms.
Data Source
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AI summary
The present invention relates to communication technologies and provides a method and a device for FSK/GFSK demodulation, the method comprises: determining a digital information vector group {Vl(i)} of a codeword a[k] to be demodulated and a corresponding phase matching vector group {θl(i)} within the duration of (2M+1)T; determining a received phase vector ϕ̃(i) of a received FSK/GFSK baseband signal ϕ(t,α); determining an average phase difference βl between ϕ̃(i) and θl(i); calculating the phase matching degree Ql between ϕ̃(i) and θl(i) after removing the impact of the average phase difference βl, and determining an l value corresponding to the phase matching degree Ql being the maximum; and determining the a[k], corresponding to the l value, in the digital information vector Vl(i) as a demodulation result. Because the impact of the average phase difference is removed during phase matching, the accuracy of phase matching is increased, and the performance of the phase domain demodulation technology is improved.