正交频分复用随钻无线传输系统及其SLM算法

doi:10.3969/j.issn.0372-2112.2015.10.007

电子学报 ›› 2015, Vol. 43 ›› Issue (10): 1924-1929.DOI: 10.3969/j.issn.0372-2112.2015.10.007

正交频分复用随钻无线传输系统及其SLM算法

罗仁泽¹, 党煜蒲², 李芮³, 杨娇³, 何国林⁴

1. 西南石油大学电气信息学院, 四川成都 610500;
2. 中海油服钻井技术服务部, 北京 101149;
3. 西南石油大学机电工程学院, 四川成都 610500;
4. 西南石油大学地球科学与技术学院, 四川成都 610500

收稿日期:2013-04-25 修回日期:2014-02-23 出版日期:2015-10-25
- 作者简介:
- 罗仁泽 男,1973年9月出生于四川省内江市,教授、博士、博导.四川省千人计划引进人材、四川省特聘专家.2005年3月获电子科技大学信号与信息处理工学博士学位.主要研究油气信号采集、传输、处理技术及仪器.发表学术论文100篇,其中Sci、EI检索47篇;独立出版学术专著1部.教材1部,作为第一发明人申报国家发明专列30余项,其中15项已授权.E-mail:lrzsmith@126.com;党煜蒲 女,1990年11出生,陕西渭南人.2013年获西南石油大学硕士学位.研究方向:OFDM系统降低PAPR技术.E-mail:ddyypp2006@126.com
- 基金资助:
- 国家自然科学基金 (No.61072073,No.61310306022); 四川省"千人计划"引进人才资金资助; 西南石油大学油气信号检测处理青年科研创新培育团队资金资助 (No.2013XJZT007); 四川省科技支撑项目

Orthogonal Frequency Division Multiplexing While-Drilling Wireless Transmission System and SLM Algorithm

LUO Ren-ze¹, DANG Yu-pu², LI Rui³, YANG Jiao³, HE Guo-lin⁴

1. School of Electrical Engineering and Information, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. COSL Drilling Technical Services Department, Beijing 101149, China;
3. School of Mechatronic Engineenring, Southwest Petrleum University, Chengdu, Silchuan 610500;
4. School of Geoscience and Technology, Southwest Petroleum University, Chendu Sichan 610500

Received:2013-04-25 Revised:2014-02-23 Online:2015-10-25 Published:2015-10-25

摘要/Abstract

摘要：

目前随钻测井信号无法实现高速传输,现有的井下泥浆脉冲传输技术传输速率较慢.本文提出了一种正交频分复用(OFDM)随钻无线传输系统可以实现高效的井下数据传输.但该系统存在其发射信号中固有的高峰均功率比(PAPR)问题.本文基于OFDM随钻无线传输系统,提出了一种分级的基-4 IFFT改进SLM算法降低其PAPR.该算法将N=4n点的基-4 IFFT运算分为前k级和后n-k级的蝶形运算,信号在两级IFFT之间乘以相位序列.理论分析表明:该法较传统SLM算法IFFT复杂度可降低近60%.

关键词: OFDM 随钻无线传输系统, 峰均比(PAPR), 选择性映射(SLM), 快速傅立叶逆变换(IFFT)

Abstract:

High-speed transmission of LWD signals is difficult to achieve by current technology.The existing downhole mud pulse transmission technology cannot meet the requirements due to its low transmission rate.To cope with this problem, this paper improves while-drilling wireless transmission system with orthogonal frequency division multiplexing (OFDM), which will result in more efficient data transmission.However, the high peak-to-average power ratio (PAPR) of the logging signals in the OFDM will gravely impact its performance.To further improve OFDM drilling wireless transmission system, we propose an SLM algorithm using radix-4 inverse fast Fourier transform (IFFT) to reduce PAPR.In this method, the radix-4-based IFFT performance at point N=4n is partitioned into two stages:transform before k and transform after n-k, between which the phase sequences are multiplied by an input signal.Theoretical analysis shows that, compared with the traditional SLM algorithm, the new SLM reduces the computational complexity almost by 60%.

Key words: OFDM while-drilling wireless transmission systems, peak-to-average power ratio (PAPR), selected mapping (SLM), inverse fast Fourier transform (IFFT).

中图分类号:

TN919.3

罗仁泽, 党煜蒲, 李芮, 杨娇, 何国林. 正交频分复用随钻无线传输系统及其SLM算法[J]. 电子学报, 2015, 43(10): 1924-1929.

LUO Ren-ze, DANG Yu-pu, LI Rui, YANG Jiao, HE Guo-lin. Orthogonal Frequency Division Multiplexing While-Drilling Wireless Transmission System and SLM Algorithm[J]. Acta Electronica Sinica, 2015, 43(10): 1924-1929.

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正交频分复用随钻无线传输系统及其SLM算法

Orthogonal Frequency Division Multiplexing While-Drilling Wireless Transmission System and SLM Algorithm

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