基于AMBE-2000的OFDM水声语音通信平台研究

The Study on Underwater Acoustic Voice Communication Platform Based on AMBE-2000 and OFDM

作者: 专业:水声工程 导师:赵安邦 年度:2010 学位:硕士  院校: 哈尔滨工程大学

Keywords

AMBE-2000, underwater acoustic communication, TMS320VC5509A, OFDM

        随着人类开发利用海洋步伐的加快,水下语音通信技术的研究越来越受到人们的重视。但应用于陆地上的通信技术并不能够完全应用于水下通信领域,这主要是由于水声信道具有有限的通信带宽及其时变、空变等特性,因此需要采用一种适用于水声信道的通信方式进行语音通信。正交频分复用(OFDM,Orthogonal Frequency Division Multiplexing)技术是一种多载波调制技术,由于其具有良好的抗多径衰弱性能和频谱利用率高而成为近年来无线通信领域中的一个研究热点。其最大的特点是传输速率高,对码间干扰和信道选择性衰落具有很强的抵抗能力。成为近年来水声通信领域的研究重点,但是其用于水下通信目前则仍然处于起步阶段。本论文就是以此为背景,以AMBE-2000芯片和TMS320VC5509A芯片为主体设计的语音通信系统并在此基础上以OFDM的调制方式实现语音实时通信。硬件设计上主要对语音信号处理模块、通信信号处理模块、逻辑控制模块和电源模块四部分进行介绍。并给出系统的硬件总体框图,全面、具体的阐述本系统涉及到的硬件电路设计与逻辑接口问题。软件上主要包括在DSP中对AMBE-2000传输进来的数据进行提取并进行OFDM的调制解调算法实现和对TLC320AIC23B的寄存器初始化及配置、CPLD中对信号的传输以及处理、AMBE-2000的初始化及配置、进行Bootloader程序设计、发射和接收程序的设计等。最后经过联调实验,获得了令人满意的效果,并进一步证明了该语音通信系统的可行性。
    The research on underwater voice communication has been paid more and more attention with the human accelerated pace of development of the oceans. However, the communication technique used on the land can not be used in the underwater acoustic communication field, because of the limited bandwidth and the time-varying and space-variant nature of the underwater acoustic channel.Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier parallel transmission technology. It has become a research focus on the field of wireless communications in recent years, because of its excellent anti-multi-path performance and high spectrum efficiency. Its most notable feature is the high-speed transmission ability as well as the strong resistibility to the inter-symbol interference and selective fading channel. Therefore, the research and application on OFDM for the underwater acoustic communication have very high value in theory and practice.The underwater acoustic voice communication system based on AMBE-2000 and DSP (TMS320VC5509A) is designed in this paper. OFDM is used to achieve the speech real-time communication. The system consists of four parts: the voice signal processing module, communication signal processing module, logic control module and power module. The overall block diagram of the system is given and the issues on hardware circuit design and logic interface are described completely and specifically. On the software side, the data transformed by the AMBE-2000 is extracted in DSP and it is modulated and demodulated by OFDM. The register of TLV320AIC23B is initialized and configured by DSP. The signal is transformed and processed in CPLD and AMBE-2000 is initialized and configured. The Bootloader program and transmitting and receiving program are designed.After the testing, the results which the experiment is given are satisfactory and the feasibility of the underwater acoustic voice communication system is proved.
        

基于AMBE-2000的OFDM水声语音通信平台研究

摘要5-6
ABSTRACT6
第1章 绪论9-16
    1.1 引言9-10
    1.2 论文的研究背景和意义10
    1.3 国内外水声通信的研究及发展状况10-12
    1.4 水声通信的基本问题描述12-15
        1.4.1 水声信道特性12-14
        1.4.2 OFDM 在水声通信中的应用14-15
    1.5 论文主要研究内容15-16
第2章 水声语音通信中的关键技术16-30
    2.1 OFDM 的基本原理18-23
        2.1.2 保护间隔(Guard Interval)22-23
        2.1.3 循环前缀(Cyclic Prefix)23
    2.2 OFDM 的关键技术23-25
    2.3 OFDM 的优缺点25-26
    2.4 语音编码技术26-28
    2.5 本章小结28-30
第3章 系统的硬件设计30-51
    3.1 系统方案30-31
    3.2 语音信号处理模块31-37
        3.2.1 AMBE-2000 语音编解码芯片介绍31-33
        3.2.2 AMBE-2000 与DSP 的接口设计33-34
        3.2.3 AMBE-2000 与CODEC 的接口设计34-35
        3.2.4 CODEC 语音输入输出接口设计35-37
    3.3 通信信号处理模块37-47
        3.3.1 TMS320VC5509A 简介37-44
        3.3.2 复位电路设计44-45
        3.3.3 EEPROM 电路设计45-46
        3.3.4 DSP 与CODEC 的接口设计46-47
        3.3.5 仿真接口设计47
    3.4 逻辑控制模块47-48
    3.5 电源模块设计48-50
    3.6 本章小结50-51
第4章 试验系统调试的软件设计51-64
    4.1 I~2C 控制程序51-52
    4.2 CPLD 控制程序52-53
    4.3 系统工作示意53-54
    4.4 发射程序54-55
    4.5 接收程序55-57
        4.5.1 接收程序流程55-56
        4.5.2 同步检测56-57
    4.6 5509A Boot Loader 程序设计57-61
        4.6.1 Boot Loader 概述57-58
        4.6.2 SPI 引导模式设置58-59
        4.6.3 引导表的建立59-60
        4.6.4 Boot Loader 程序流程60-61
    4.7 联调实验61-63
    4.8 本章小结63-64
结论64-65
参考文献65-69
攻读硕士学位期间发表的论文和取得的科研成果69-70
致谢70-71
附录71
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