【作者】 闫俊；

【导师】 夏志忠；

【作者基本信息】 大连海事大学 ， 通信与信息系统， 2004， 硕士

【摘要】 近年来，无线通信作为通信领域中发展最快的分支，在社会的许多领域发挥着重要作用。随着数字信号处理芯片(DSP)的出现，无线通信得到了飞速的发展，其涉及的领域越来越广泛。本论文在短波通信的背景下，主要研究并实现了基于DSP数据调制系统。 在系统设计的过程中，我们根据短波信道的特点和系统的需要，分阶段的选择了调制方式和编码方式，并搭建了相应的硬件电路，最终实现了数据的调制和解调。在此过程中，设计的主要内容包括： 1)在VC++6.0环境下，编制上位机软件。实现人机交互和对原始数据的编码、交织。 2)利用计算机串行口和PCI总线两种方式，完成计算机与硬件电路的数据交换。 3)设计DSP的高速硬件电路，实现DSP的正常工作。 4)编制DSP程序，实现DSP与上位机软件通信及DSP对接收的数据进行调制。 本设计最终实现了DSP对上位机数据的调制及发射。论文的研究意义在于对适用于短波通信的几种常用调制方式加以探讨，并在相应的硬件电路上实现。设计中采用通用的数字信号处理芯片完成硬件电路与计算计的通信和对数据处理；利用直接数字合成(DDS)技术完成对数据的调制。更多还原

【Abstract】 Recently, wireless communication has shown its importance in most of areas in our society, as one of the most developing branches in communication fields. It is now developing fast especially with the appearance of Digital Signal Processing Chip (DSP). In the background of wireless communication, my thesis focuses on the system of data modulation based on DSP and realized it at last.During the process of designing system, we selected the suitable modulation and coding gradually, based on the characteristic of shortwave channel and the custom’s demand. At the same time, we made the hardware circuit successfully and realization the modulation and demodulation on it. Our design includes:1)In the circumstance of VC++6.0, we programmed the part of software to interface with persons, and performed the task of coding and interweave.2)By the way of the Serial Port or PCI of computer, we performed the data exchange between the computer and circuit board.3)We designed the high speed hardware circuit of DSP, and ensured the DSP working well.4)We programmed on the DSP and realized to functions: the data exchange between DSP and software in computer; the modulation of data received from computer.Our design realized the modulation and transmission of data on DSP finally. Meanwhile the significance of the thesis is that discussed the modulations common used in shortwave channel, and realized on the hardware board. We adopted the general DSP chip to achieve the modulation and data exchange. And while programmed on DSP, we modulated data by the way of Direct Digital Synthesizer (DDS).更多还原