用TMS320C6201实现H.263编译码系统

介绍了用TMS320C6201实现视频压缩编码标准H.263的编译码系统,并以编码系统为例,给出其硬件设计及软件的优化处理方法.     

光纤码分多址技术在城域接入网中的应用

分析了光纤码分多址技术O -CDMA在城域接入网中的应用。回顾了O -CDMA技术的发展历史 ,详细地介绍了O -CDMA技术的特点 ,其具有的公平性、灵活性、网络控制管理、对服务区处理能力以及高的安全性使O -CDMA技术成为较好的城域接入网技术。阐述了目前在应用中O -CDMA存在的一些技术方面的问题     

Interference suppressing for cellular MIMO system based on turbo receiver

Space-Time Coding （STC）, which combines channel coding, modulation, and multiple transmit antennas, is a powerful scheme to achieve higher data rates and combat fading in wireless systems, in this paper, we propose a soil/cancellation turbo equalization scheme to suppress Co-Channel Interference （CCI） in STC systems. The simulation results show that the proposed method significantly improves the system＇s ability of interference suppression, while preserving the space-time structure.     

一种基于流水线的MQ编码器FPGA设计

提出了一种应用于JPEG2000标准的4级流水线MQ编码器设计方案.采用状态超前更新,前导0位超前检测和字节输出缓冲策略,解决了在上下文(CX)状态表更新、归一化及字节输出过程中的反馈和循环等问题,提高了编码效率.同时,对关键路径处算法进行优化,提高了系统工作的时钟频率.该设计使用VHDL语言在RTL级描述,并在FPGA上对其进行了仿真验证.实验表明,在Altera的StratixⅡ EP2S601020C4上,编码器的工作效率可以达到1CxD/cycle,最高工作时钟频率可达99.66 MHz.     

无线信元反向复用及动态容量调整技术研究

根据ATM无线链路组网需求,提出了适合无线链路反向复用的编码及动态容量调整技术。该技术适用于利用微波、散射和卫星等传输手段进行ATM/MPLS无线机动组网,编码纠错门限为2×10-3,当通信节点无线传输距离增大或信道传输质量变恶劣时,通过动态容量调整技术自动降低信号速率以提高业务传输质量,该项技术特别适合新一代宽带网络。     

高速光纤通信线路DmB1M码型初探

本文介绍分析一种适合超高速光传输线路码型——DmB1M码的构成及其功率谱特性;并试制了D10B1M码的编/解码器;认为该码型有其独特的优点并适于超高速光传输系统。     

Object-oriented analysis-synthesis coding based on moving two-dimensional objects

An object-oriented analysis-synthesis coder is presented which encodes arbitrarily shaped objects instead of rectangular blocks. The objects are described by three parameter sets defining their motion, shape and colour. Throughout this contribution, the colour parameters denote the luminance and chrominance values of the object surface. The parameter sets of each object are obtained by image analysis based on source models of moving 2D-objects and coded by an object-dependent parameter coding. Using the coded parameter sets an image can be reconstructed by model-based image synthesis. In order to cut down the generated bit-rate of the parameter coding, the colour updating of an object is suppressed if the modelling of the object by the source model is sufficiently exact, i.e., if only a relatively small colour update information would be needed for an errorless image synthesis. Omitting colour update information, small position errors of objects denoted as geometrical distortions are allowed for image synthesis instead of quantization error distortions. Tolerating geometrical distortions, the image area to be updated by colour coding can be decreased to 4% of the image size without introducing annoying distortions. As motion and shape parameters can efficiently be coded, about 1 bit per pel remains for colour updating in a 64 kbit/s coder compared to about 0.1 bit per pel in the standard reference coder (RM8) of the CCITT. Experimental results concerning the efficient coding of motion and shape parameters are given and discussed. The coding of the colour information will be dealt with in further research.     

一种在二值计算机上实现多值逻辑运算的方法

分析了在二值计算机上实现多值逻辑运算与多值逻辑表示方法的关系，在此基础上，给出一种特殊多值逻辑值的二进制编码，并提出一种在二值计算机上建立起完备的多值逻辑运算集的方法，从而实现了在二值计算机上有效地解决实际多值逻辑问题。     

PT2262/PT2272编解码IC在视频切换矩阵中的应用

提出了一种用PT2262/PT2272编解码IC制作的16×16视频切换矩阵的设计方案 ,给出了具体的电路图 ,同时在对其原理进行分析的基础上 ,指出了用该方案派生其它规格视频切换矩阵的基本思路。     

精密跟踪测量雷达用轴角编码器误差分析及控制

分析了精密跟踪测量雷达用轴角编码器产生测量误差的原因，并结合实际提出了控制测量误差的具体措施。