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Wireless signal enhancement demodulation method and system based on generation classification network

A wireless signal and classification network technology, applied in the field of signal demodulation, can solve the problem that the signal demodulation method does not have good demodulation performance, and achieve the effects of good demodulation performance, improved performance, and reduced model size

Active Publication Date: 2021-08-10
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a wireless signal enhanced demodulation method and system based on a generated classification network, so as to solve the problem that the signal demodulation method in the prior art does not have good performance on non-stationary channels. Technical issues with demodulation performance

Method used

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  • Wireless signal enhancement demodulation method and system based on generation classification network
  • Wireless signal enhancement demodulation method and system based on generation classification network
  • Wireless signal enhancement demodulation method and system based on generation classification network

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Embodiment 1

[0068] This embodiment provides a wireless signal enhanced demodulation method based on the generated classification network, the method includes the following steps:

[0069] Step 1, wireless signal modulation:

[0070] Determine the signal frequency band, modulation method, transmission symbol and symbol rate of the wireless signal, and determine the equipment model, bandwidth and sampling rate of the transmitting end and receiving end;

[0071] Step 2, communication system deployment:

[0072] Determine the outdoor deployment site, determine the topological structure between the transmitter and receiver, and perform distance measurement and system debugging for the outdoor deployment site;

[0073] Step 3, communication wireless signal collection:

[0074] According to the determined topology, start the communication system to collect wireless signals at different communication distances, and perform synchronous processing on the collected wireless signals;

[0075] Step...

Embodiment 2

[0105] This embodiment provides a wireless signal enhanced demodulation system based on a generated classification network, including a sending end and a receiving end, and the sending end and the receiving end are respectively connected to a PC;

[0106] Both the sending end and the receiving end include a universal software radio peripheral (ie USRP) and an antenna;

[0107] The sending end sends a 2FSK modulated signal;

[0108] The receiving end receives the modulated analog signal in the air, and converts the analog signal into a digital signal through a universal software radio peripheral (USRP) and stores it in the PC;

[0109] The PC includes a demodulation module, and the demodulation module adopts the wireless signal enhanced demodulation method based on the generated classification network according to any one of claims 1 to 7, and the demodulation module is used to demodulate the digital signal received on the PC.

Embodiment 3

[0111] This embodiment provides a wireless signal enhanced demodulation method based on the generated classification network, which uses the same method as the wireless signal enhanced demodulation method based on the generated classification network in Embodiment 1. Generally speaking, as figure 1 As shown in the flow chart of the implementation of this method, this method receives a 2FSK modulated signal, and after digitally sampling the signal at the receiving end, cuts it according to the symbol length, and uses the FFT method to perform fast Fourier transformation on the sampled data of each symbol. Transform to get the spectral characteristics of the interfered wireless signal |X(f)| i. Similarly, after digital sampling and clipping of the signal sent by the sending end, the FFT method is used to perform fast Fourier transform to obtain the spectral characteristics of the undisturbed wireless signal |R(f)| i . The symbol for each sample is B i . From this, the input ...

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Abstract

The invention provides a wireless signal enhancement demodulation method based on a generation classification network. The method comprises the following steps: 4, wireless signal feature selection of a wireless signal input by a demodulation network: selecting a wireless signal feature of an original wireless signal after direct current removal and fast Fourier transform as the wireless signal feature of the wireless signal input by the demodulation network. 5, wireless signal demodulation: employing a demodulation network to demodulate the wireless signals, wherein the demodulation network is a trained deep neural network which uses the symbol information of the signals and the wireless signals without interference as labels in a demodulation network training process at the same time, and training is carried out to obtain the trained deep neural network; the demodulation network comprises a generation network and a classification network, the generation network is adopted to perform wireless signal enhancement, the enhanced wireless signal is input into the classification network, and an information bit stream is output, so demodulation of the wireless signal is realized.

Description

technical field [0001] The invention belongs to the field of signal demodulation, relates to a wireless signal enhanced demodulation method, in particular to a wireless signal enhanced demodulation method and system based on a generation and classification network. Background technique [0002] Existing wireless communication has extremely low signal-to-noise ratio, echo delay, intersymbol interference (ISI), time propagation, Doppler effect, vibration fading, polarization and other effects, and traditional signal demodulation algorithms also show Weaknesses such as insufficient demodulation capability. The traditional demodulator usually adopts a specific demodulation algorithm, because it needs to be matched with the modulation end, resulting in poor general performance. When upgrading the modulation technology or replacing the physical layer technology solution, it usually requires a system-level redesign, which is of great importance to the technology. R&D and cost are ...

Claims

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Application Information

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IPC IPC(8): H04L27/14G06N3/08
CPCH04L27/14G06N3/08
Inventor 陈晓江寇欣刘彤李昊育房鼎益
Owner NORTHWEST UNIV
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