【摘要】：由于正交頻分復(fù)用(Orthogonal Frequency-Division Multiplexing,OFDM)技術(shù)具有頻譜利用率高、抗多徑能力強(qiáng)、能夠高速傳輸?shù)葍?yōu)點(diǎn),近年來(lái)被越來(lái)越多的水聲研究者引入,使其逐漸成為高速水聲通信中的研究重點(diǎn)和熱點(diǎn)之一�，F(xiàn)有的水聲OFDM通信實(shí)現(xiàn)大多是在DSP芯片(Digital Signal Processor)上實(shí)現(xiàn)的,DSP芯片盡管擁有現(xiàn)成的快速傅里葉算法(FFT)庫(kù),運(yùn)算速度較快,但是沒(méi)有良好的通用性和人機(jī)交互功能。本文將水聲OFDM通信技術(shù)和Android系統(tǒng)應(yīng)用程序開(kāi)發(fā)技術(shù)結(jié)合在一起,設(shè)計(jì)完成了一款基于Android系統(tǒng)的水聲OFDM通信應(yīng)用程序。本文主要完成的工作如下:1.對(duì)水聲OFDM通信進(jìn)行Matlab建模與仿真,分析OFDM技術(shù)在水聲通信領(lǐng)域中的應(yīng)用特點(diǎn),為在Android系統(tǒng)上的實(shí)現(xiàn)提供理論基礎(chǔ)。2.利用Android應(yīng)用程序開(kāi)發(fā)工具和JNI (Java Native Interface)實(shí)現(xiàn)方式,設(shè)計(jì)完成了能夠被Android系統(tǒng)調(diào)用的水聲OFDM通信調(diào)制與解調(diào)庫(kù)。3.設(shè)計(jì)Android系統(tǒng)下水聲OFDM通信程序?qū)崿F(xiàn)的總體方案。根據(jù)軟件模塊化的設(shè)計(jì)思想構(gòu)建出軟件系統(tǒng)總體結(jié)構(gòu)框圖;對(duì)結(jié)構(gòu)框圖按照功能不同劃分出不同的模塊,分別是圖形用戶(hù)界面模塊、OFDM調(diào)制與解調(diào)模塊、音頻發(fā)送模塊和音頻采集模塊;設(shè)計(jì)接口,分別實(shí)現(xiàn)各個(gè)模塊;利用多線程技術(shù)整合各個(gè)模塊實(shí)現(xiàn)Android系統(tǒng)下的水聲OFDM通信應(yīng)用程序。4.通過(guò)軟件調(diào)試以及水池實(shí)驗(yàn)驗(yàn)證了整個(gè)設(shè)計(jì)的正確性和Android系統(tǒng)下實(shí)現(xiàn)水聲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.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TN929.3;TP311.52

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