Multiple Combinational Algorithm to Adaptively Track and Detect Measurement While Drilling Electromagnetic Wave Signal
Band-pass filter is frequently used in measurement while drilling(MWD)system of electromagnetic(EM)wave transmission,so as to remove out-of-band noise.However,such design will increase the error rate of decoding when dealing with non-stationary time varying signal and especially in-band signal.By studying features of EM-MWD transmission and channel noise jamming,a multiple combinational algorithm that can adaptively track and detect EM signal is proposed in this article.This algorithm is a combination of low-pass filtering,five-point triple smoothing,adaptive notch,adaptive cancellation and line enhancement,and it takes recursive least squares as its principle of adaptive tracking.As theoretical analysis and simulation show,such algorithm can effectively extract useful signal from noisecontaminated signal and reduce the bit error rate,which lays a good foundation for further decoding.
EM-MWD multiple combination algorithm adaptive track and detect recursive least squares bit error rate
Li Fukai Yang Zhiqiang Fan Yehuo Hao chun Zhu Guangdong Jin Yujian Fang Juan Li Tianlu
Seventh Research Department China Research Institute of Radiowave Propagation Xinxiang,China
国际会议
杭州
英文
1-5
2018-12-03（万方平台首次上网日期，不代表论文的发表时间）