OFDM水声通信在Android系统下实现初探

发布时间：2019-05-29 00:14

【摘要】：由于正交频分复用(Orthogonal Frequency-Division Multiplexing,OFDM)技术具有频谱利用率高、抗多径能力强、能够高速传输等优点,近年来被越来越多的水声研究者引入,使其逐渐成为高速水声通信中的研究重点和热点之一。现有的水声OFDM通信实现大多是在DSP芯片(Digital Signal Processor)上实现的,DSP芯片尽管拥有现成的快速傅里叶算法(FFT)库,运算速度较快,但是没有良好的通用性和人机交互功能。本文将水声OFDM通信技术和Android系统应用程序开发技术结合在一起,设计完成了一款基于Android系统的水声OFDM通信应用程序。本文主要完成的工作如下:1.对水声OFDM通信进行Matlab建模与仿真,分析OFDM技术在水声通信领域中的应用特点,为在Android系统上的实现提供理论基础。2.利用Android应用程序开发工具和JNI (Java Native Interface)实现方式,设计完成了能够被Android系统调用的水声OFDM通信调制与解调库。3.设计Android系统下水声OFDM通信程序实现的总体方案。根据软件模块化的设计思想构建出软件系统总体结构框图;对结构框图按照功能不同划分出不同的模块,分别是图形用户界面模块、OFDM调制与解调模块、音频发送模块和音频采集模块;设计接口,分别实现各个模块;利用多线程技术整合各个模块实现Android系统下的水声OFDM通信应用程序。4.通过软件调试以及水池实验验证了整个设计的正确性和Android系统下实现水声OFDM通信的可行性。
[Abstract]:Orthogonal Frequency Division Multiplexing (Orthogonal Frequency-Division Multiplexing,OFDM) technology has been introduced by more and more underwater acoustic researchers in recent years because of its high spectrum efficiency, strong anti-multi-path ability, high speed transmission and so on. It has gradually become one of the research priorities and hotspots in high-speed underwater acoustic communication. Most of the existing underwater acoustic OFDM communication implementation is implemented on DSP chip (Digital Signal Processor). Although DSP chip has a ready-made fast Fourier algorithm (FFT) library, the operation speed is fast, but it does not have good generality and human-computer interaction function. In this paper, the underwater acoustic OFDM communication technology is combined with the Android system application development technology, and a underwater acoustic OFDM communication application program based on Android system is designed and completed. The main work of this paper is as follows: 1. The Matlab modeling and simulation of underwater acoustic OFDM communication are carried out, and the application characteristics of OFDM technology in the field of underwater acoustic communication are analyzed, which provides a theoretical basis for the implementation of underwater acoustic communication system. 2. Using Android application development tool and JNI (Java Native Interface) implementation, the modulation and demodulation library of underwater acoustic OFDM communication which can be called by Android system is designed and completed. The overall scheme of underwater acoustic OFDM communication program in Android system is designed. According to the design idea of software modularization, the overall structure block diagram of the software system is constructed. The structure block diagram is divided into different modules according to different functions, which are graphical user interface module, OFDM modulation and demodulation module, audio transmission module and audio acquisition module, and the interface is designed to realize each module. Using multi-thread technology to integrate each module to realize the underwater acoustic OFDM communication application program in Android system. 4. The correctness of the whole design and the feasibility of realizing underwater acoustic OFDM communication under Android system are verified by software debugging and pool experiments.
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.3;TP311.52

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