用于测井电缆数据传输的低复杂度时域均衡器设计  

Design of Time-Domain Equalizer with Low Complexity for Logging Cable Data Transmission

作　　者：王春林 王建民 丁希金 苏楠 杨陆 WANG Chunlin;WANG Jianmin;DING Xijin;SU Nan;YANG Lu(Daqing Branch,China Petroleum Logging CO.LTD.,Daqing,Heilongjiang 163412,China;Technology Center,China Petroleum Logging CO.LTD.,Xi’an,Shaanxi 710077,China)

机构地区：[1]中国石油集团测井有限公司大庆分公司,黑龙江大庆163412 [2]中国石油集团测井有限公司技术中心,陕西西安710077

出　　处：《测井技术》2020年第4期347-352,共6页Well Logging Technology

基　　金：中国石油集团测井有限公司科研项目“存储式测井仪器优化集成与应用”(CPL2018-A07);大庆油田有限责任公司重大科技专项“过钻杆测井技术研究”(dq-2012-cs-ky-003)。

摘　　要：测井电缆作为测井数据传输系统的物理媒介,其较长的冲激响应特性使传输信号产生严重的畸变,使接收端信号产生严重的拖尾和码间干扰,导致通信系统性能恶化。在基于正交频分复用技术的测井电缆通信系统中,缩短这种信号拖尾的有效方法是时域均衡技术,利用时域均衡器缩短电缆信道冲激响应,使均衡后的信号拖尾长度小于正交频分复用码元的循环前缀长度,从而消除码间干扰。提出一种低复杂度的时域均衡器设计方法,能够快速实现时域均衡器设计中的信道估计和时延优化算法。在7000 m测井电缆条件下测试结果表明,该方法设计的时域均衡器能够有效改善测井电缆传输系统在循环前缀长度不足时的系统性能。Logging cable is the physical medium that is used in logging data transmission system.Its inherent character of long impulse responses causes serious distortion of the transmission signal,serious tailing and intersymbol interference of the receiver signal,and worsen the performance of the communication system.In the well logging cable communication system based on orthogonal frequency division multiplexing(OFDM)technology,an effective way to shorten the signal trail is time-domain equalization technology.The time-domain equalizer is used to shorten the impulse response of the cable channel,so that the trail length of the balanced signal is less than the cyclic prefix length of orthogonal frequency division multiplexing symbols,so as to eliminate the intersymbol interference.This study presents a low complexity design method of the time-domain equalizer which achieves algorithm of channel estimation and time delay optimization rapidly.The test results under the condition of 7000 m logging cable show that the time-domain equalizer designed by this method can effectively improve the performance of logging cable transmission system when the length of cyclic prefix is insufficient.

关 键 词：测井电缆 数据传输 正交频分复用 系统同步 信道估计 时域均衡 最小均方误差 

分 类 号：P63184文献标识码:A[天文地球—地质矿产勘探]