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OFDM channel estimation and signal detection method based on deep learning

A channel estimation and signal detection technology, which is applied in the field of OFDM channel estimation and signal detection based on deep learning, and can solve the problems of higher diversity of channel sample data and complex mechanism.

Active Publication Date: 2020-07-10
BEIHANG UNIV
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Problems solved by technology

However, for the UAV data link OFDM channel estimation and signal detection problems in complex environments, the mechanism of multipath effects is more complex than that of general scenarios, and the diversity of channel sample data is required to be higher

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  • OFDM channel estimation and signal detection method based on deep learning
  • OFDM channel estimation and signal detection method based on deep learning
  • OFDM channel estimation and signal detection method based on deep learning

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Embodiment Construction

[0055] The specific implementation method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0056] The present invention is an OFDM channel estimation and signal detection method based on deep learning, which uses a deep neural network to realize OFDM multipath channel estimation and original signal detection, and can quickly and accurately restore the original signal.

[0057] like figure 2 As shown, it specifically includes the following steps:

[0058] Step 1, generate a sample database of the OFDM multipath channel model matrix in a complex environment based on the existing Non-WSSUS channel model;

[0059] The present invention performs multi-path channel modeling in a complex environment based on a Non-Wide-Sense Stationary Uncorrelated Scattering (Non-WSSUS) channel model, and generates channel matrix sample data accordingly. The Non-WSSUS channel model is based on the time-frequency transformation function, w...

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Abstract

The invention discloses an OFDM channel estimation and signal detection method based on deep learning, and belongs to the field of unmanned aerial vehicle measurement and control communication. The method comprises the following steps: firstly, generating a sample database of an OFDM multipath channel model matrix in a complex environment based on an existing No-WSSUS channel model; then, constructing a neural network comprising a channel estimation sub-network and a signal detection sub-network, and training the neural network by utilizing the data sample of the multipath channel model matrix; finally, applying the trained neural network to the OFDM data link system of the unmanned aerial vehicle in a complex environment in an off-line mode, and detecting signals while a channel is estimated. According to the method, a large-data-volume channel sample set capable of reflecting OFDM channel characteristics in a complex environment is generated, so that the whole network can effectivelyreflect nonlinear characteristics of a wireless channel and a transmission signal.

Description

Technical field [0001] The invention belongs to the field of UAV measurement and control communications, and specifically refers to an OFDM channel estimation and signal detection method based on deep learning. Background technique [0002] The UAV data link is an important part of the UAV system and realizes functions such as remote control, telemetry and reconnaissance information return of the UAV platform. When UAVs perform tasks in complex geographical terrain environments, the data link system is often affected by the "Multipath Effect". That is, in addition to receiving direct waves from the transmitter, the data link receiver also receives Reflected waves with different amplitudes and phases (diffuse reflection or specular reflection) generated from different reflecting surfaces in the environment, thereby producing inter-symbol interference (Inter-Symbol-Interference, ISI), and the width expansion of the received signal caused by the multipath effect The phenomenon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03G06N3/04G06N3/08
CPCH04L25/0212H04L25/0242H04L25/03006G06N3/08G06N3/045
Inventor 刘春辉王美琳丁文锐
Owner BEIHANG UNIV
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