Extended binary phase shift keying modulation and demodulation method for frequency spectrum compression

Abstract

The invention discloses an extended binary phase shift keying modulation and demodulation method for frequency spectrum compression, which is an information modulation method used for digital communication. The method uses a binary information code element to directly change a continuous phase of a sinusoidal carrier to realize modulation, and uses a type of special simple-zero multi-pole narrowband digital filters with quite close resonance frequencies to realize demodulation so that a modulated signal f0(t) corresponding to the number '0' is sine wave of N carrier cycles, while a f1(t) corresponding to the number '1' is in the sine wave of N carrier cycles with an angular frequency of omega, and the phases and carrier frequencies of front K cycles synchronize and change continuously according to the sine rule. The method directly controls the continuous changed magnitude of the phases of the sinusoidal carrier and the time duty ratio thereof by using data bits, namely the method can change the signal bandwidth, transmission code rate and transmission performance respectively or simultaneously, and can realize high-speed data transmission of extremely narrow bandwidth.

Description

technical field [0001] The invention relates to an information modulation method for digital communication, in particular to a spectrum-compressed extended binary phase-shift keying modulation and demodulation method, which belongs to the technical field of digital information transmission. Background technique [0002] In a digital communication system, the process of moving the baseband signal representing binary data up to a given transmission frequency band is called modulation, and the opposite process is called demodulation. With the continuous broadbandization of information transmission systems, the radio frequencies in the air are becoming more and more crowded. The auction price of the 20-year use right of the 10MHz spectrum in Europe has reached as high as 4 billion euros. Therefore, like energy and water resources, spectrum is also an important strategic resource of the country and has become a bottleneck restricting the sustainable development of the country. H...

AI Technical Summary

Problems solved by technology

[0008] 1) The modulation waveform has a phase jump of θ angle at the beginning of the data "1", so its phase is discontinuous, and the time waveform is also discontinuous;

[0009] 2) Since the derivative of the phase with respect to time t is the frequency, and the phase of the waveform in formula (1) has a sudden jump, the instantaneous frequency change reaches ±∞

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