upf_demos

語音信號是基於時間軸上的一維數位信號，在這裏主要是對語音信號進行頻域上的分析。在信號分析中，頻域往往包含了更多的資訊。對於頻域來說，大概有8種波形可以讓我們分析：矩形方波，鋸齒波，梯形波，臨界阻尼指數脈衝波形，三角波，餘旋波，余旋平方波，高斯波。對於各種波形，我們都可以用一種方法來分析，就是傅立葉變換：將時域的波形轉化到頻域來分析。(Voice signal is based on the timeline of one-dimensional digital signal, where mainly the speech signal in frequency domain analysis. In signal analysis, frequency domain often contains more information. For the frequency domain for about 8 allows us to analyze waveforms: rectangular square wave, sawtooth, trapezoidal wave, the critical damping index pulse, triangle wave, I spin wave, I spin square wave, Gaussian. For all waveforms, we can analyze in a way that is Fourier transform: the transformation of time domain waveform into the frequency domain to analyze)

Hadamard Transform for PAPR reduction in OFDM

说明：  matlab 的一个洗牌算法，调用固定区间的随机数生成，然后根据随机数序列交换位置，达到洗牌效果(Matlab call a random number generate function then exchange the numbers according to the random numbers)

说明：  伪随机码或称PN码，是扩频通信中不可缺少的一种序列。扩频通信，简单的说来就是通过一组相关性很强的伪随机序列，使原有的信号按照伪随机序列的特性出现。从波形上看，原有信号完全淹没于随机的噪声中，达到隐藏信号和抗干扰的目的。接受方只要有相同的伪随机序列，就可以通过伪随机序列很强的相关性将信号还原出来。而m序列，是扩频系统中最长用的伪随机序列。下面的代码就是基于matlab的生成m序列的代码，通过改变初始多项式的值，就可以生成不同阶数的m序列。(Pseudo-random code or PN code, spread spectrum communication is indispensable to a sequence. Spread spectrum communication, a simple to say that the adoption of a group of highly related to pseudo-random sequence, so that the original signal in accordance with the characteristics of pseudo-random sequence there. From the wave point of view, the original signal completely submerged in the random noise to hide the purpose of signal and interference. As long as the recipient has the same pseudo-random sequence, the pseudo-random sequence can be a strong correlation to restore the signal out. And m sequence spread spectrum system is the longest of the pseudo-random sequence used. The following code is generated based on m sequences of matlab code, by changing the value of the initial polynomial, we can generate a different order of the m sequence.)

说明：  OFDM完整仿真程序 包括QAM，qpsk调制仿真(OFDM Simulation Using Matlab,The perfect simulation of OFDM)

公交调度需要考虑公司和乘客的多方利益，因此要根据实际情况做出灵活有效的调度方案。(Bus Dispatch to consider a multi-stakeholder companies and passengers, so to make a flexible and effective scheduling scheme according to the actual situation.)

GrTheory - Graph Theory Toolbox. Functions: grBase - find all bases of digraph grCoBase - find all contrabases of digraph grCoCycleBasis - find all independent cut-sets for a connected graph grColEdge - solve the color problem for graph edges grColVer - solve the color problem for graph vertexes grComp - find all components of graph

在基带产生MSK信号 在基带产生MSK信号 在基带产生MSK信号(producing the equivalent baseband MSK signal )

leaach protocol necessary for clustering in wsn

A matlab fft implementation using matlab itself