Study on BCH Based Encoder and Decoder Approach for EM-MWD Communication System

Abstract

In practical applications of electromagnetic measurement while drilling (EM-MWD), the signal-to-noise ratio (SNR) of receiver cannot always meet the requirements of reliable communication conditions due to the earth-attenuation, interfering signal from well site, etc. Aimed to solve these problems, this paper presents a BCH encoder and decoder technology based on BPSK for EM-MWD. First, the paper studies the relationship between BCH encoding error performance and decoding method, source length and other factors through simulation; then, we obtain an optimal length of BCH code for EM-MWD through analyzing the bit error performance of hard-decision decoding and soft-decision decoding with different lengths of BCH code. The results show that the proposed algorithm can reduce the bit error rate at a lower SNR, achieving a reliable communication condition when the SNR of a received signal is reduced. It is demonstrated the effectiveness of the proposed BCH encoder and decoder algorithm based on BPSK for EM-MWD.