随钻声波信道中基于OFDM的信息传输分析  

Analysis of Information Transmission Based on OFDM in Acoustic Telemetry Channel While Drilling

作　　者：尚海燕[1] 周静[1] 谢海明[1] 

机构地区：[1]西安石油大学油气钻井技术国家工程实验室,陕西西安710065

出　　处：《西安石油大学学报（自然科学版）》2017年第2期76-80,85,共6页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：陕西省教育厅自然科学研究项目"随钻声波传输信道模拟与信息最佳传输研究"(编号:15JK1582);西安石油大学科技基金研究项目"OFDM技术在随钻声波遥传系统中的应用研究"

摘　　要：提出利用OFDM传输方案在随钻声波信道中进行数据传输的方法。首先分析了随钻声波钻杆信道的频谱资源和衰落特性,然后对OFDM的传输方案进行分析与实现,包括OFDM循环前缀的设计和OFDM系统参数的选择,最后对所设计的传输方案在随钻声波2个给定信道上进行了传输仿真。结果表明:在BPSK相位矫正的基础上,由100根钻杆级联信道上,绝大多数研究频点的传输误码率很低,信息传输是可靠的;由200根钻杆级联信道上,绝大多数研究频点的传输误码率都相当高,如果不采取特别的措施,可以认为此时信道不可用。A data transmission method in the acoustic telemetry channel while drilling using OFDM transmission scheme is proposed.Firstly,the spectrum resources and fading characteristics of the drill pipe acoustic telemetry channel while drilling are analyzed,and then the cyclic prefix scheme of OFDM is designed and implemented,including the realization of block diagram of the system and the analytical selection of OFDM system parameters. Finally,the transmission scheme is simulated on two given channels. The simulation results show that on the basis of BPSK phase correction,on the 100 drill pipe cascade channel,the transmission error rate is very low in most of the research frequency points,and the information transmission is reliable. But on 200 drill pipe cascade channel,the transmission error rate in most of the research frequency points is very high,and if special measures are not taken,it can be considered that the channel is not available at this time.

关 键 词：随钻声波信道 OFDM BPSK相位矫正 频率选择性慢衰落 

分 类 号：TE21[石油与天然气工程—油气井工程] P631.8[天文地球—地质矿产勘探]