The content of this dissertation are including : an implement solution of wireless data trans - receiving system brief introduction of usb 1 . 1 specifications the interfacing technology with pc through usb development procedure of an applied dsp system and its hardware and soft wares discussions on digital signal processing method and system reliability the system introduced in this dissertation has been authenticated and experts considered that it will have a promising future 内容涉及到无线数字通信系统的的发展现状及未来的发展方向；提出了系统的总体设计方案；介绍了usb1 . 1协议规范；给出了usb设备开发实例及相应的驱动程序设计；分析了dsp系统的开发流程及实例；介绍了上层应用程序设计；对数字通信中的信源编码、信道编码、直接序列扩频、数字调制方案以及系统的可靠性等方面进行了研究。
Abstract : this paper is mainly about my research work on source quantization and source coding ? the basic method is to optimize the system coding by use of combining the channel coding and source coding or parts of these two coding , and there presented a new approach of source quantization , combined source - channel quantization 本文主要介绍了作者在信源最优量化及编码方面所进行的一些研究工作。作者的出发点是将信道编码和信源编码相结合，或是将两者的部分功能相结合从而达到提高系统编码效率的目的。
Wavelets are becoming a key technique in the ongoing source compression standard jpeg - 2000 . the positive arguments for advocating dwt in image watermarking are : preventing watermark removal by jpeg - 2000 lossy compression , reusing previous studies on source coding regarding the visibility of image degradations , and offering the possibility of embedding in the compressed domain 在小波域嵌入水印的原因是：可以防止由于jpeg - 2000有损压缩而造成的水印消除；可以利用信源编码领域对图像失真的可见性研究成果控制水印的嵌入位置和强度；可以实现在压缩域直接嵌入水印。
