2ASK signal demodulation method based on stochastic resonance

A stochastic resonance and signal demodulation technology, applied in the direction of AM carrier system, etc., can solve the problems of coherent demodulation, such as high bit error rate, error, and useful signal weakening

Inactive Publication Date: 2019-11-05
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

This demodulation method will not only introduce errors in carrier frequency estimation, but also may cause useful signals to be attenuated due to improper filter design during low-pass filtering, especially at low signal-to-noise ratios, coherent demodulation will produce high BER

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  • 2ASK signal demodulation method based on stochastic resonance
  • 2ASK signal demodulation method based on stochastic resonance
  • 2ASK signal demodulation method based on stochastic resonance

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Embodiment Construction

[0015] In the drawings, the same parts are represented by the same symbols in different views, and the described elements are not necessarily drawn to scale. The present invention will be further described below in conjunction with the drawings and embodiments.

[0016] figure 1 is a block diagram of an instruction manual and a system block diagram of the entire demodulation method. After the receiver receives the 2ASK signal, it first undergoes signal preprocessing. The signal preprocessing includes carrier frequency estimation and stochastic resonance system, and then the military only judges the IOU for the output of the random working system.

[0017] figure 2 is a schematic diagram of the modified covariance algorithm for carrier estimation. The modified covariance algorithm is based on minimizing the forward and backward prediction errors. In this way, the calculation of its error power is performed on twice as many data points as compared to the covariance method, wh...

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Abstract

The invention discloses a 2ASK signal demodulation method based on stochastic resonance, and belongs to the field of digital communication signal processing. The method is characterized in that a bistable stochastic resonance system is adopted to preprocess a 2ASK signal with a low signal-to-noise ratio at a receiving end, and carrier estimation is carried out on the signal at the receiving end. According to the approximate adiabatic theory, stochastic resonance can carry out nonlinear filtering processing on signals, the signal-to-noise ratio of the signals is improved, the signals obtain energy from noise, the demodulation performance of a receiving end in a low signal-to-noise ratio environment is improved, the demodulation error rate of the receiving end is effectively reduced, and themethod can be effectively applied to a communication system taking 2ASK as a modulation mode.

Description

technical field [0001] The application background of the present invention is in a digital communication system with 2ASK signal as the main communication mode in a communication environment with low signal-to-noise ratio. The content of the invention relates to the non-linear preprocessing and demodulation of 2ASK signals at the receiving end of the communication system, the purpose of which is to improve the demodulation performance of the receiving end of the communication system and reduce the bit error rate of information, which belongs to the technical field of communication signal processing. Background technique [0002] In some communication environments, due to poor communication channels, receivers are required to have good demodulation performance for digital communication signals under low SNR to ensure the effectiveness and accuracy of the communication system. [0003] At present, the typical demodulation method of 2ASK signal is the coherent demodulation meth...

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Application Information

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IPC IPC(8): H04L27/06H04L27/02
CPCH04L27/02H04L27/06
Inventor 黄涛周金治
Owner SOUTHWEAT UNIV OF SCI & TECH
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