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Research on Acoustic Transmission in the Logging While Drilling Based on Precoding NC-OFDM System

Abstract— The non-continuous orthogonal frequency division multiplexing (NC-OFDM) acoustics transmission system based on drill strings channel can achieve high-speed transmission for the logging data from the borehole. However, there are a series of problems in the system, such as high peak to average power ratio (PAPR) in the transmitter, and the transmission performance degraded by spectral nulls. Aiming for the problems above, a BPSK based on precoder is proposed in this paper. By this method the BPSK modulated data is translated from 1 to half of 0 and half of  2 . Then the PAPR is reduced and the robustness of spectral nulls is improved.

Index Terms— logging while drilling, high-speed transmission, PAPR; NC-OFDM, precoding, spectral nulls.

Si-Min Wu, Xiang Ling
School of Communication and Information, University of Electronic Science and Technology of China, CHINA
Wei Zhang, Yi-Bing Shi
School of Automation Engineering, University of Electronic Science and Technology of China, CHINA

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Cite: Si-Min Wu, Xiang Ling, Wei Zhang, Yi-Bing Shi, "Research on Acoustic Transmission in the Logging While Drilling Based on Precoding NC-OFDM System," Proceedings of 2018 the 8th International Workshop on Computer Science and Engineering, pp. 1-6, Bangkok, 28-30 June, 2018.