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A channel coding method for wireless measurement-while-drilling transmission system

A wireless measurement-while-drilling and transmission system technology, which is applied in the direction of error correction/detection, coding, and coding components using linear codes, which can solve the problems of inability to obtain bit error rate performance and low complexity of hard-decision decoding.

Active Publication Date: 2021-09-14
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

If the channel coding of the wireless electromagnetic measurement while drilling transmission system adopts a linear block code scheme, it is necessary to use a soft-decision decoding algorithm because the hard-decision decoding has low complexity but cannot obtain better bit error rate performance.

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  • A channel coding method for wireless measurement-while-drilling transmission system
  • A channel coding method for wireless measurement-while-drilling transmission system
  • A channel coding method for wireless measurement-while-drilling transmission system

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Embodiment Construction

[0041] 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.

[0042] The flow of a channel coding method for a wireless measurement-while-drilling transmission system is as follows figure 1 As shown, the wireless measurement-while-drilling transmission system is divided into two parts: downhole instruments and surface instruments, and the following methods are used to receive and send information:

[0043] Step 11, the downhole instrument encodes the message M to be sent using the BCH code encoding method to obtain the sequence E;

[0044] Step 12, the downhole instrument sends out the coded sequence E after modulation and amplification;

[0045] Step 13, the ground instrument demodulates the received signal to obtain the received sequence r;

[0046] Step 14, decoding the recei...

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Abstract

The invention discloses a channel coding method for wireless measurement-while-drilling transmission system. Demodulate the data, use the Berlecamp iterative algorithm to optimize the hard decision algorithm of the BCH code, stimulate the potential of the BCH code through the exhaustive method, and restore the underground transmission information with the lowest possible bit error rate. The main advantages are: each set of exhaustive decoding results is instant, and at most only two sets of data of hard-decision decoding results need to be saved, which will not have a large impact on storage space; through soft-decision decoding, wireless random The measurement while drilling transmission system brings a coding gain of at least 2dB, which can reduce the bit error rate of the measurement while drilling transmission system, and achieve the goal of extending the transmission distance of the measurement while drilling system by reducing the signal-to-noise ratio under the premise of the same bit error rate.

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 channel coding method for a wireless measurement-while-drilling transmission system. Background technique [0002] According to different transmission media, the wireless measurement while drilling system is divided into three transmission modes: acoustic wave, mud pulse and electromagnetic wave. Among them, the acoustic transmission signal has large attenuation and is seriously disturbed by the environment; the mud pulse has high reliability and can be used for long-distance transmission and is easy to operate, but the signal transmission rate is low. 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 to the large influence of signal attenuation. [0003] ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/15
CPCH03M13/152
Inventor 王家豪董浩斌蒋哲栋蒋国盛卢春华
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)