测井电缆高速遥测OFDM技术同步方案  

Wireline High Speed Telemetry Synchronization Scheme Based on OFDM Technology

作　　者：陆云峰 李会银 周扬 

机构地区：[1]中国石油大学地球科学与技术学院,山东青岛266580

出　　处：《测井技术》2015年第3期330-334,共5页Well Logging Technology

基　　金：国家重大科研装备研制项目深部资源探测核心装备研发(ZDYZ2012-1)-07子项目深部矿床测井系统-01课题井下仪器单元资助

摘　　要：OFDM调制解调技术可以提高测井电缆遥测速率。当使用高阶QAM调制OFDM所需要的信息时,系统的同步要求提高了,在测井电缆遥测上要进一步提高传输速率的信息,必须对系统的同步加以研究。提出适用于测井电缆遥测系统的符号同步误差的采样频偏联合估计同步方案;从SCA符号同步算法着手,分析符号定时同步误差的整数部分与小数部分所对应的关系,采用最小二乘法估计采样频偏,使用Matlab进行模拟仿真。模拟仿真的结果表明,采用联合同步方案确实能够提高系统性能。Based on OFDM modulation and demodulation technology, we can improve the rate of well logging cable telemetry. While using high-order QAM modulation OFDM information needed, we must improve the system＇s synchronization performance. To improve the transmission rate of the well logging cable telemetry, synchronization must be studied. We present a method suitable to well logging cable telemetry system of symbol synchronization error sampling frequency offset joint estimation of synchronization scheme based on 64QAM modulation, and make simulation using Matlab. According to SCA classic symbol synchronization algorithm, we analyse the correspondent relation between the integer part of symbol timing synchronization error and the fractional part of it. Then we estimate the sampling frequency offset using the least squares method. The final simulation results show that joint synchronization scheme can really improve the system performance.

关 键 词：测井仪器 测井遥测 MATLAB仿真 OFDM同步 SCA算法 采样频偏 

分 类 号：P631.83[天文地球—地质矿产勘探]