电子科技大学学报2017，Vol.46Issue(1)：46-54,9.DOI:10.3969/j.issn.1001-0548.2017.01.008
基于钻柱声波信道的随钻数据V-OFDM传输方法研究
Research on the Logging While Drilling Data Transmission Method of V-OFDM Based on Drillstring Acoustic Channel
摘要
Abstract
Data transmission system of logging while drilling achieves real-time communication between ground and under well accurately and effectively by acoustic wave transmitting along the drillstring. A drillstring channel is periodically constructed by pipes and joints. By theoretical analysis and modeling simulation, the spectrum of drillstring channel is a comb-filtering-like transfer function composed of alternating passed bands and stop bands. A finite impulse response (FIR) filter is used to approximate the spectrum and to build a simulation platform of the channel. Vector orthogonal frequency division multiplexing technology (V-OFDM) can convert the multipath fading channel into a number of vector sub-channels. The number of error bits which are leaded by channel spectral nulls can be reduced and the robustness can be increased by diversity gain when eliminating symbol interference by adding right amount of cyclic prefix. Simulation and test results show that this technology can reduce data redundancy and increase transmission efficiency extremely when meeting the need of low bit error rate.关键词
声波传输/误码率/钻柱信道/FIR滤波器/V-OFDMKey words
acoustic wave transmission/bit error rate/drillstring channel/FIR filter/V-OFDM分类
信息技术与安全科学引用本文复制引用
马东,师奕兵,张伟,柳国振..基于钻柱声波信道的随钻数据V-OFDM传输方法研究[J].电子科技大学学报,2017,46(1):46-54,9.基金项目
国家自然科学基金(61201131)；“十二五”国家科技重大专项(2011ZX05020-005) （61201131）
