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	钻柱声传输信号多载波调制激励分析
	李成 ; 刘钊 ; 丁天怀 ; 樊尚春 ; LI Cheng ; LIU Zhao ; DING Tian-huai ; FAN Shang-chun
	2016-03-30 ; 2016-03-30
关键词	钻柱 声传输信号 多径信道 多载波激励 噪声抑制 drillstring acoustic transmission signal multipath channel multi-carrier modulation excitation noise suppression TE921
其他题名	Multi-carrier modulation excitation analysis for acoustic transmission signal in a drillstring
中文摘要	在随钻声遥测技术中,周期性钻柱结构产生的多重回波极易造成严重的码间干扰和较高误码率,为此,根据钻柱信道的多径传输特性,基于短钻杆条件下多载波传输的实验分析,建立了多节钻杆与管箍的周期性信道有限差分模型。考虑地面噪声和信道内多径回波干扰,利用最小均方自适应均衡,基于"4钻杆-3管箍"信道结构进行了多载波调制性能仿真分析。仿真结果表明,与单载波PSK(Phase-Shift-Keying)调制相比,OFDM(Orthogonal Frequency Division Multiplexing)多载波调制可使误码率平均降低约50%;在非周期性结构下其传输性能受信道变化敏感,但相同条件下仍优于PSK调制,且通过子载波相位补偿可有效改善误码率、提高传输性能。; The multiple echoes caused by periodic structure of a drillstring in acoustic telemetry during drilling tend to lead to the serious intersymbol interference and high bit error rate. According to the multipath transmission characteristics of a drillstring,based on the multi-carrier acoustic transmission test analysis along a short drill pipe,a finite difference model for a periodic channel composed of multiple drill pipes and tool joints was established. Considering the ground surface noises and multipath echo interferences in the channel,a least mean square adaptive equalization method was introduced. Then,the multi-carrier modulation performance was simulated by using a drillstring structure with four drill pipes and three tool joints. The simulation results showed that the orthogonal frequency division multiplexing( OFDM)-based multi-carrier modulation can obtain a bit error rate( BER) which is 50 % less than that of the phaseshift-keying( PSK) modulation; although its transmission charateristics is sensitive to a non-periodic channel structure,its BER is superior to that of PSK modulation and it can be effectively improved by use of sub-carrier phase compensation.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/144541]
专题	清华大学
推荐引用方式 GB/T 7714	李成,刘钊,丁天怀,等. 钻柱声传输信号多载波调制激励分析[J],2016, 2016.
APA	李成.,刘钊.,丁天怀.,樊尚春.,LI Cheng.,...&FAN Shang-chun.(2016).钻柱声传输信号多载波调制激励分析..
MLA	李成,et al."钻柱声传输信号多载波调制激励分析".(2016).

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