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Ternary notation frequency modulation key modulation method

A key modulation and ternary technology, applied in the direction of frequency modulation carrier system, etc., can solve the problems of low frequency band utilization, discontinuous change of MSK signal frequency, discontinuous phase of modulated signal, etc.

Inactive Publication Date: 2013-11-20
HARBIN ENG UNIV
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Problems solved by technology

[0003] However, the above three modulation methods have their own shortcomings. The MPSK modulation method is a multi-ary modulation method with high frequency band utilization, but the phase of the modulated signal is discontinuous, which broadens the power spectrum of the MPSK signal; the QAM modulation method is also The multi-ary modulation method, but with the increase of the modulation system, the energy required to ensure the communication performance will be very large; the MSK modulation method is a binary minimum frequency shift keying modulation method, which is a constant amplitude of the modulated signal. The phase continuous modulation method, but the frequency change of the MSK signal is discontinuous, which makes its power spectrum wider, and the binary system has lower frequency band utilization than the multi-ary system

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  • Ternary notation frequency modulation key modulation method
  • Ternary notation frequency modulation key modulation method
  • Ternary notation frequency modulation key modulation method

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Embodiment Construction

[0044] The present invention is described in more detail below in conjunction with accompanying drawing:

[0045] combine figure 1 . It can be seen that the frequency law of the TFMK modulated signal is: when the ternary symbol is "0", the frequency of the modulated signal remains unchanged; when the ternary symbol is "-1", the frequency of the modulated signal increases first After frequency reduction; when the ternary symbol is "1", the frequency of the modulated signal is reduced first and then increased.

[0046] combine figure 2 . It can be seen that the phase of the modulated signal is continuous and the frequency transition is smooth, which makes the smoothness of the modulated signal higher.

[0047] combine image 3 . image 3 is the power density spectrum curve of Rb from 0 to 10, and Rb is the ratio of frequency point f to TFMK modulation bandwidth B, that is It can be seen that the energy of the TFMK modulated signal is mainly concentrated near the carrier...

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Abstract

The invention provides a ternary notation frequency modulation key modulation method. A modulation parameter D is calculated according to a modulation bandwidth B and a code element period T; three modulated signal waveform samples s1(t) and s2(t) are generated according to a central frequency fc of a modulated signal, the code element period T and the modulation parameter D; phase variation Psi0, Psi1 and Psi2 of the three modulated signal waveform samples within a code element interval are respectively calculated; a binary information code element is converted into a ternary information code element; an initial phase PhiT of the modulated signal of a nth information code element is calculated; a modulated signal waveform sample is selected according to the ternary information code element, and the modulated signal for generating the ith information code element is converted an analog modulated signal through a digital-analog converter. The modulated signal generated by the modulation method has high energy concentration, and the digital communication with high frequency band utilization rate can be realized.

Description

technical field [0001] The invention is a digital communication modulation method, specifically a ternary frequency modulation keying modulation method. Background technique [0002] The main purpose of spectrally efficient modulation technology is to obtain the maximum bandwidth efficiency, and the requirements for digital transmission channel performance are getting higher and higher. Therefore, it is necessary to study spectrally efficient modulation technology to maximize bandwidth efficiency and solve the problem of spectrum congestion. Satellite systems with non-linear transponders require constant envelope modulation techniques, so MPSK, quadrature amplitude modulation QAM and minimum frequency shift keying MSK are widely used. [0003] However, the above three modulation methods have their own shortcomings. The MPSK modulation method is a multi-ary modulation method with high frequency band utilization, but the phase of the modulated signal is discontinuous, which br...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/12
Inventor 郭黎利周彬高飞孙志国
Owner HARBIN ENG UNIV
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