Research on Downhole Low-Frequency Electromagnetic Wave Wireless Transmission based on Differential Phase Shift Keying and Forward Error Correction Codes
DOI:
https://doi.org/10.54097/c90smw65Keywords:
Differential Phase Shift Keying (DPSK), Forward Error Correction Coding (FEC), Electromagnetic Wave Transmission, MATLAB SimulationAbstract
Due to the complex downhole environment in oil and gas wells, electromagnetic wave wireless transmission suffers from high attenuation, multipath interference, and low signal-to-noise ratio, making long-distance and reliable communication difficult. To address these challenges, a composite modulation method combining Differential Phase Shift Keying (DPSK) and Forward Error Correction (FEC) is proposed. A downhole channel model incorporating path loss, multipath effects, and noise interference was established, and a transmitting–receiving hardware system was designed. Signal transmission characteristics in different media were experimentally investigated to analyze electromagnetic signal propagation behavior. The encoding and decoding performance of the DPSK–FEC scheme was evaluated through MATLAB simulations, focusing on the phase disturbance resistance of DPSK and the error correction capability of FEC. The coding parameters were further optimized to match downhole channel characteristics. The non-coherent demodulation mechanism of DPSK provides robustness against phase noise and frequency drift, while FEC introduces redundancy to detect and correct transmission errors, significantly improving system reliability. Experimental results show that the proposed system can operate stably at a depth of 1000 m and an environmental temperature of 75°C, enabling reliable bidirectional transmission of downhole data over long distances.
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