Measurement while drilling channel estimation method based on deep learning
A channel estimation and measurement-while-drilling technology, applied in the field of communication, can solve problems such as strong noise, non-linear transmission channel, interference, etc., and achieve high-precision, high-quality channel estimation
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[0023] In the drilling fluid MWD system, the drilling fluid pulse signal x(t) generated by the downhole drilling fluid generator is sent to the ground through the drilling fluid channel, and is collected by the pressure sensor on the ground. The received signal on the ground is:
[0024] y(t)=x(t)*h(t)+z(t) (2-1)
[0025] In formula (2-1), y(t) represents the received signal; x(t) is the downhole transmission signal, that is, the pressure wave generated by the pulse generator; h(t) is the time-domain pulse response of the channel, that is, the response to the drilling pipeline Channel description; "*" is a convolution operator; z(t) is a noise signal; usually to complete channel estimation, it is necessary to insert a known training sequence into x(t) at the sending end, and use the training sequence sent at the receiving end The corresponding y(t) completes the channel estimation; according to the Fourier transform, the convolution of the signal in the time domain corresponds...
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