Impact filtering method for strengthening asymmetric binary modulating signal

A modulating signal and impact filtering technology, applied in electrical components, impedance networks, digital technology networks, etc., can solve problems such as insufficient steepness, and achieve the effects of effective transmit power, simplified structure, and increased communication distance.

Active Publication Date: 2009-12-09
苏州东奇信息科技股份有限公司
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Problems solved by technology

Although it can better maintain or even highlight the waveform characteristics of the ABSK modulation signal ( image 3 (b)), but the overall filter

Method used

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  • Impact filtering method for strengthening asymmetric binary modulating signal
  • Impact filtering method for strengthening asymmetric binary modulating signal
  • Impact filtering method for strengthening asymmetric binary modulating signal

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Embodiment Construction

[0037] Based on a single zero-pole pair, adding one or more poles can produce a more intense and obvious impact waveform at the information modulation of the ABSK signal than a single zero-single-pole IIR filter, and the filter bandwidth is significant. Narrowing, the output signal-to-noise ratio is greatly improved, and even when the signal is completely submerged by noise (signal-to-noise ratio SNR<0), the modulation information of the signal can be highlighted in the form of overshoot, so it can be called digital Impact filters (Impacting Filters) or ABSK signal digital enhancer. However, the following technical requirements must be observed:

[0038] 1. The zero and pole points are very close to present notch-frequency selection characteristics in a very narrow neighborhood of the center frequency of the filter, but the zero frequency cannot be between the pole frequencies. That is, if the zero frequency is at the low end of the filter frequency, it is below the frequenci...

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Abstract

The invention discloses an impact filtering method for strengthening an asymmetric binary modulating signal, belonging to the digital information reception technical field. The impact filtering method for strengthening the signal is based on a special infinite impulse response (IIR) narrowband digital band-pass filter, the filter is composed of simple zero and multiple poles, and extremely narrowtrapped wave-frequency selection characteristic can be presented at the center frequency of the filter, so that filtering output waveform adaptive to the asymmetric binary modulating signal produces obvious and intense parasitic amplitude modulation impact at information modulation position, output signal to noise ratio can be greatly improved, and modulation information of the signal even can behighlighted in overshooting form under the condition that the signal is completely submersed by the noise, thus transmission performance of the asymmetric binary modulating signal can be obviously improved and the structure of a receiver can be simplified.

Description

technical field [0001] The invention relates to a special impact filter method, which is used to enhance the signal-to-noise ratio of an asymmetric binary modulation signal, and belongs to the technical field of digital information reception. Background technique [0002] Keying the amplitude (2ASK), frequency (2FSK) or phase (2PSK) of the sinusoidal carrier within the symbol period T is the basic binary (binary) modulation mode for digital communication, radar, sonar and other information systems. If the modulation period τ<T, asymmetric binary shift keying (ABSK: Asymmetric Binary Shift Keying) modulation is obtained. In general, the binary modulation used in digital communication is symmetrically modulated by "0" and "1", for example, in the following unified binary amplitude / phase modulation expression: [0003] f 0 (t) = Asinω c t, 0≤t<T [0004] f 1 ( t ) = ...

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Application Information

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IPC IPC(8): H03H17/06
Inventor 吴乐南冯熳高鹏
Owner 苏州东奇信息科技股份有限公司
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