Coding and decoding method of polarization channel in wireless measurement-while-drilling system based on gray code structure

Abstract

The invention discloses a polarization channel coding method of a wireless measurement-while-drilling system based on a Gray code structure. The method includes: constructing a polarization channel coding method according to the structure of the Gray code, and then using the coding method for wireless measurement-while-drilling In the channel coding module of the downhole instrument of the system; according to the channel coding method of the downhole instrument, a continuous elimination list (SCL) decoding algorithm is designed, and then the algorithm is applied to the decoding module of the ground instrument of the wireless measurement while drilling system to restore the downhole send data. The advantage of this method is that: since the constructed polar channel coding method has a Gray code structure, it has better bit error performance than ordinary polar codes, further stimulates the potential of polar codes, and effectively reduces the wireless measurement while drilling. The bit error rate of the system improves the reliability of the system.

Description

technical field [0001] The invention relates to the technical field of measurement-while-drilling of oil, natural gas, coal mines, etc., in particular to a polarization channel coding method of a wireless measurement-while-drilling system based on a Gray code structure. Background technique [0002] The data transmission methods of the wireless measurement-while-drilling system include mud pulse, electromagnetic wave and sound wave. The wireless measurement-while-drilling system is divided into two parts: downhole instruments and surface instruments. The downhole instruments mainly include sensor modules, channel coding, modulation modules and power amplifiers; the surface instruments mainly include signal conditioning modules, signal processing modules, demodulation modules and decoding modules. module. The system mainly transmits downhole engineering parameters and geological parameters. The amount of data sent downhole is small, and the code length of the sent data is us...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to adopt a wireless measurement-while-drilling system based on the Gray code structure in view of the technical defects that there are strong noise interference signals in the communication channel of the current wireless measurement-while-drilling system, and the ground instrument receiver is difficult to correctly restore downhole information. Polar channel coding method to solve the above problems

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