基于OFDM提高深海投弃式剖面仪传输性能的研究

发布时间：2018-06-07 07:31

本文选题：投弃式温盐深剖面仪 + 正交频分复用技术　；参考：《天津工业大学》2017年硕士论文

【摘要】：深海蕴藏着丰富的矿产、生物等自然资源,作为一个海洋大国,深海资源的开发以及深海水文数据的获取对我国未来的经济建设和海上军事强国战略都将具有重要的意义。深海投弃式温盐深剖面仪(Expendable Conductivity Temperature and Depth Profiling System)简称XCTD,是国外近年来研制的一种高性价比深海探测型设备,由于其具有走航、实时、大面积、低成本和高精度测量的特点,自问世以来就得到了海洋学家和研究学者的高度关注。考虑到仪器重量、成本以及复杂的海洋环境等原因,XCTD信道采用的是单根双股漆包线,信道呈现时变、低通窄带、低信噪比的特点。目前XCTD信道主要采用单载波ASK、DPSK传输方式,但传统单载波传输方式下提高信号的传输速率,信号的幅值将大大减小,在一定的传输频率下,随着探测深度的增大,信号的幅值衰减越大,因此受信道条件的限制,如何在充分利用有限带宽资源的同时进一步提高XCTD信道传输性能成为了研究的主要目的。本文首先对XCTD信道的电路模型进行了优化,接着针对XCTD信道的特点进行了分析,提出了 OFDM(Orthogonal Frequency Division Multiplexing)技术适用于XCTD信道传输的技术优势,然后在Simulink平台上搭建了 XCTD信道的仿真电路模型,在此基础上建立了 OFDM系统的仿真模型,详细对比了 OFDM与单载波传输方式ASK、DPSK的仿真结果,验证了 OFDM技术在保证XCTD信号传输准确性的同时提高了信号的传输速率。最后,利用RS编码和过采样技术对OFDM仿真系统进行了优化,通过仿真结果更进一步证明了 OFDM技术提高XCTD信道传输性能的可行性和有效性,对提高XCTD信道传输性能的研究提供了一种新的思路。
[Abstract]:Deep-sea is rich in mineral, biological and other natural resources. As a large marine country, the exploitation of deep-sea resources and the acquisition of deep-sea hydrological data will be of great significance to China's future economic construction and the strategy of maritime military power. Expendable Conductivity Temperature and Depth Profiling System) is a kind of high performance-price ratio deep-sea detection equipment developed in foreign countries in recent years. It has the characteristics of navigation, real-time, large area, low cost and high precision measurement. Since its inception, oceanographers and researchers have been highly concerned. Considering the weight, cost and complex marine environment, the XCTD channel adopts single double-strand enamelled wire, which is time-varying, low pass narrowband and low signal-to-noise ratio (SNR). At present, the XCTD channel mainly adopts the single carrier ASK DPSK transmission mode, but under the traditional single carrier transmission mode, increases the signal transmission rate, the signal amplitude will reduce greatly, under certain transmission frequency, with the detection depth increases, Due to the limitation of channel conditions, how to further improve the transmission performance of XCTD channel while making full use of limited bandwidth resources has become the main purpose of the research. This paper first optimizes the circuit model of XCTD channel, then analyzes the characteristics of XCTD channel, and puts forward the technical advantages of OFDM(Orthogonal Frequency Division Multiplexing) technology for XCTD channel transmission. Then the simulation circuit model of XCTD channel is built on Simulink platform, and then the simulation model of OFDM system is established. The simulation results of OFDM and ASK / DPSK are compared in detail. It is verified that OFDM technology not only ensures the accuracy of XCTD signal transmission, but also improves the transmission rate of XCTD signal. Finally, the OFDM simulation system is optimized by using RS coding and oversampling technology. The simulation results further prove the feasibility and effectiveness of OFDM technology to improve the transmission performance of XCTD channel. It provides a new way to improve the transmission performance of XCTD channel.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P716

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