Polarized channel coding method for measurement while drilling transmission system

A technology of transmission system and coding method, which is applied in the field of measurement while drilling, can solve the problems of transmission distance limitation, large influence of signal attenuation, low reliability of data transmission, etc., achieve excellent bit error rate performance and reduce bit error rate effect

Active Publication Date: 2019-02-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that, in view of the above-mentioned technical defects that the current measurement-while-drilling transmission system is greatly affected by signal attenuation, the transmissio

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  • Polarized channel coding method for measurement while drilling transmission system
  • Polarized channel coding method for measurement while drilling transmission system
  • Polarized channel coding method for measurement while drilling transmission system

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Embodiment Construction

[0051] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0052] A polarization channel coding method used in the measurement-while-drilling transmission system. When the CA-SCL decoding algorithm is used, the coding and decoding process of the Polar code is as follows figure 1 As shown, the components of the measurement-while-drilling transmission system are as follows: figure 2 As shown, the downhole instrument includes a sensor module, channel coding, modulation module and power amplifier; the ground instrument includes a signal conditioning module, a signal processing module, a demodulation module and a decoding module.

[0053] The measurement-while-drilling transmission system adopts the following methods to send and receive information:

[0054] Step 11, the sensor mo...

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Abstract

The invention discloses a polarized channel coding method for a measurement while drilling transmission system. The method comprises: a channel coding module of an underground instrument first calculates a cyclic redundancy check (CRC) code of transmitted data, adds the CRC code to a specific position of an information bit or a fixed bit, and then codes the transmitted data and the CRC code thereof by adopting a coding method for a Polar code; and a decoding module of a ground instrument performs coding by adopting a CRC-assisted successive cancellation List (CA-SCL) algorithm to restore the underground transmitted data. The method has the advantages that the specific CRC code position is selected by Gaussian approximation, the Polar code is constructed, and a certain coding gain can be obtained at a receiving end after CA-SCL decoding, so that the bit error rate of the measurement while transmitting transmission system is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of measurement-while-drilling in oil, natural gas, coal mines, etc., in particular to a polarization channel coding method for a measurement-while-drilling transmission system. Background technique [0002] According to different information transmission media, the data transmission methods of measurement while drilling mainly include mud pulse, electromagnetic wave, sound wave, and intelligent drill pipe. Among them, mud pulse and electromagnetic wave are the most widely used and relatively mature technologies. Due to the limitation of pulse diffusion and mud characteristics, the transmission rate of mud pulse is low, and it cannot be applied in foam or gas drilling. Compared with mud pulses, electromagnetic waves are not affected by drilling fluid, and can be applied to foam drilling and gas drilling. The transmission rate has been improved to a certain extent, but the transmission distance is limited due ...

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Application Information

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IPC IPC(8): H03M13/09H03M13/13
CPCH03M13/09H03M13/13
Inventor 叶敦范蒋哲栋王家豪卢春华
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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