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摘　要:根据HFC网络上行信道的特性,建立了信道模型 分析了上行信道中存在的各种噪声对QPSK 调制技术的影响。结果表明在C /N (传输信道载噪比)较低的情况下,采用QPSK调制方式,可以提高系 统的抗干扰能力。 关键词: QPSK 光纤同轴电缆混合网 上行信道 噪声(Abstract: HFC network in accordance with the characteristics of the uplink channel, the establishment of a channel model an analysis of the various uplink channel noise on the impact of QPSK modulation. The results show that the C/N (transmission channel carrier-to-noise ratio) lower, the use of QPSK modulation, can improve the system of anti-interference ability. Keywords: QPSK hybrid fiber coaxial cable network uplink channel noise)

说明：  经验模态分解(Empirical Mode Decomposition,EMD)法是黄锷(N. E. Huang)在美国国家宇航局与其他人于1998年创造性地提出的一种新型自适应信号时频处理方法，特别适用于非线性非平稳信号的分析处理。(Empirical Mode Decomposition)

关于用MATLAB语言来编写哈夫曼的编码器的程序(Program on the MATLAB language to write the Huffman encoder)

基于质心算法的无线传感器网络的研究，但是定位精度较低。(Wireless sensor networks based on the centroid algorithm research, but lower positioning accuracy.)

snake为从网上下载的程序包,该程序包内容较全，涉及了snake的很多改进形式，可以参考。(A good program bag of snake)

matlab 绘制偏微分方程的函数 对于绘制偏微分方程的函数和边界曲线非常有参考性(matlab draw a function of partial differential equations for the mapping function of partial differential equations and the boundary curve of a very good reference of)

matlab 中最方便的工具，simulink,本资料中搭建了BPSK，QPSK的simulink.(MATLAB SIMULINK)

卡尔曼滤波的labview模型，适用于system identification的labview程序中(kalman filter model of labview)

part1.m 1. Converts 14 image pairs of a video sequence to grayscale. 2. Computes the absolute difference between the pairs yielding 15 images. camshift.m 1. Implementation of the CAMSHIFT algorithm for tracking a hand in a video sequence. Executing this project from within Matlab At the command prompt enter: >>part1 >>camshift

代码为QPSK半分析方法计算误码率，下载后直接运行就行了(code for QPSK semi-analytic method BER, downloaded directly running on the line)