Demodulation method for unifying binary modulation signal

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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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 crystals, and the crystal filter’s Once the center frequency is set, it cannot be adjusted. Not only is it poor in flexibility, it is easily affected by temperature and vibration, and it is difficult to integrate digitally. In particular, his so-called "zero group delay" theory is not perfect; at the same time, people (including Walker believes that traditional digital filters, whether it is a finite impulse response (FIR) filter or an infinite impulse response (IIR) filter structure, cannot be used for ultra-narrowband communication

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