keepexcellent

现在谱分析的发展，详细介绍了谱分析的发展情况，建议学习谱分析的相关人士阅读(Now the development of spectral analysis, spectral analysis described in detail the development of the proposed study and spectral analysis of the relevant people to read)

可以实现向量场的绘制，简单导入即可实现结果(vector field)

本程序仿真了AWGN信道下，采用DS扩频对bpsk信号的影响，扩频码采用walsh码，扩频因子16； 接收端进行rake接收，然后分集合并，比较了三种分集方式对误码率的影响 从图像可以看出在扩频因子较高的情况下，最大比值合并与等增益合并性能相近(This program simulates the AWGN channel, using DS spread spectrum signal for bpsk influence spreading code using walsh code spreading factor 16 Rake receiver receiving end, and diversity combining, diversity compares three methods on the bit error rate of As can be seen from the image in the case of higher spreading factor, the maximum ratio combining and equal gain combining similar performance)

6LoWPAN入门教程_ArchRock 详细实现了6LoWPAN(6 lowpan introductory tutorial _ArchRock detailed implementation for 6 lowpan)

compressed matlab related book

Estimation of direction in degree for doa study

power_triphaseline.rar,功率电子领域matlab仿真文件，已经验证过，程序运行正常(power_triphaseline.rar, Power electronics field matlab simulation file, has already been verified, the normal operating procedures)

法国中央科学研究院和美国RICE大学共同开发了时频分析工具箱（matlab emd） 是一款非常好用的时频分析计算工具，它是分析时变非平稳信号的有力工具，matlab 时频分析工具箱提供了时间域与频率域的联合分布信息，清楚地描述了信号频率随时间变化的关系。 其中主要含有四种函数： 信号产生函数，可以产生不停类型的信号，如Chirp信号，bpsk信号等。 时频分析函数，可以计算线性、Cohen类、仿射类非线性分析值函数，例如短时傅里叶变换（STFT），Gabor变换，谱图，Wigner-Ville（WVD）等。 分析处理函数 图形显示函数，如等高线、三维图等。(Time-frequency analysis toolbox)

这里面有两个程序，两个都是采用4QAM调制。不过个人觉得第一个更容易懂，因为写的很有条理。我改的那个程序就是根据这个来的。 不过在这里面有个问题就是信道系数只能是由高到低，大家可以试试，改成[0.227 0.46 0.688 0.46 0.227]这个是老师给我的仿真中常用的信道系数，这个成为归一化信道，就是系数平方和为1. 第二个程序没有涉及到信道系数，但是这个程序当中，在128个子载波中，前后有32个空载波，这个在OFDM中也是经常用的，这样可以降低误码率。 (And there are two programs, two are based on 4QAM modulation. But personally feel that the first is easier, because the writing is organized. I changed that procedure is based on the past. However, there is a problem in that there is only channel coefficients from high to low, we can try and change into [0.227 0.46 0.688 0.46 0.227] This is the teacher gave me the simulation channel coefficient commonly used, this became normalized channel, is coefficient of the square and is 1. The second program is not related to channel coefficients, but this program which, in the 128 sub-carriers, the before and after the 32 air carriers, the in OFDM is also often used, which can reduce the error rate.)

可以仿真出2PSK的误码性能，并以此为基础可以仿真出MPSK的误码性能(2PSK can simulate the error performance, and on this basis can be simulated BER performance of MPSK)