| 正交频分复用随钻无线传输系统及其SLM算法 |
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| 引用本文： | 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. |
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| 作者姓名： | 罗仁泽 党煜蒲 李芮 杨娇 何国林 |
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| 作者单位： | 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 |
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| 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%.
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| 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) |
| 收稿时间： | 2013-04-25 |
Orthogonal Frequency Division Multiplexing While-Drilling Wireless Transmission System and SLM Algorithm |
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| 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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| Authors: | LUO Ren-ze DANG Yu-pu LI Rui YANG Jiao HE Guo-lin |
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| Affiliation: | 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 |
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| 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%. |
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| Keywords: | OFDM while-drilling wireless transmission systems peak-to-average power ratio (PAPR) selected mapping (SLM) inverse fast Fourier transform (IFFT) |
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