Demodulation method for unifying binary modulation signal

A demodulation method and signal modulation technology, applied in the field of digital information transmission, can solve problems such as poor flexibility, difficult digital integration, susceptibility to temperature and vibration, etc., and achieve good noise removal, narrow bandwidth, and noise filtering capabilities strong effect

Inactive Publication Date: 2008-12-03
苏州东奇信息科技股份有限公司
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Problems solved by technology

[0003] Based on the idea of ​​zero group delay filter, Walker has achieved a spectral efficiency much higher than that of binary phase shift keying (BPSK) modulation and a power efficiency not inferior to that of BPSK. The analog band with high quality factor (Q value) invented by Walker pass filter ( figure 1 , see H.R.Walker: Ultra Narrow Band Modulation Textbook, 2006, http://www.vmsk.org/) Although the effect has recently been confirmed by Bell Laboratories in the United States, it is realized by using quartz crystal...

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  • Demodulation method for unifying binary modulation signal
  • Demodulation method for unifying binary modulation signal
  • Demodulation method for unifying binary modulation signal

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[0022] figure 2 The amplitude-frequency and phase-frequency curves of the zero group delay filter given by Walker, image 3 and Figure 4 They are the schematic diagrams of the amplitude-frequency and phase-frequency characteristic curves when the parallel and series resonances occur in the quartz crystal respectively. Obviously, when the series and parallel resonance points are very close, the combined amplitude-frequency and phase-frequency curves of the crystal are exactly the same as the amplitude of the filter given by Walker. The frequency and phase frequency curves match. If the digital realization of the crystal filter is considered, the series and parallel resonance points correspond to the zero and pole points of the digital filter respectively. We can complete the Walker by designing an IIR filter with very close zero points and conjugate poles. Digital implementation of crystal filters.

[0023] The present invention takes a pair of conjugate zero, the IIR filt...

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Abstract

The invention provides a method for demodulating uniform binary modulation signals, which includes a narrowband digital band pass filter and a threshold detector; the narrowband digital band pass filter is composed of one or more IIR digit filter basic links that are concatenated together, each basic link utilizes a pair of zero point and an extreme point that have very approximate resonant frequency to generate a zero group delay point on a phase-frequency characteristic curve, which can indicate the modulation characteristics of the signal while removing the noise; the threshold detector adjudicates the amplitude jump corresponding to the signal modulation characteristics at the output end of the narrowband digital band pass filter directly by a given or self-adjusted level value so as to demodulate the binary modulation information of the uniform binary modulation signals.

Description

technical field [0001] The invention relates to a digital demodulation method for unifying binary modulation signals, which belongs to the technical field of digital information transmission. Background technique [0002] Research on efficient communication technology at home and abroad is mostly limited by specific application backgrounds or domain goals, focusing on a certain actual system (such as third-generation mobile communication) or specific indicators (such as code rate), which has a recognized theoretical basis and has been obtained. New technologies such as orthogonal frequency division multiplexing (OFDM) modulation, ultra-wideband (UWB) transmission, multi-antenna (MIMO) space-time / space-time-frequency coding and other new technologies that have been tested in practice and therefore have very low risk are very hot and fruitful. . But for new concepts or potential technologies with higher risks that have not yet reached a consensus, little or no one cares about...

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Application Information

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IPC IPC(8): H04L27/00H04L25/49
Inventor 吴乐南冯熳马力
Owner 苏州东奇信息科技股份有限公司
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