mlmethod

Simulation of OFDM PAPR

封装了windows操作串口的几个API（CreateFile， ReadFile，WriteFile，SetComState）。串口的读写设置这几个操作都可以简单地只用关键一两个参数就能实现操作。也是一个很好的例子，我写这个之前查了不少资料，感觉非常麻烦，索性发出来给新手们作个样例(Windows serial COM port access class，it includes CreateFile, SetComState，ReadFile，WriteFile，CloseFile)

在CBuilder中如何控制游戏手柄，对手柄编程(How to control the game in the CBuilder handle, to handle programming)

costas环解调程序，需要的可以参考一下。costas环解调.m(It is a matlab code for demodulation as costas ring .if you are interested in it, you can refer to it.)

说明：  polar码的SC译码，里面有详细的代码介功能绍pdf，非常细致(SC decoding of polar code, which has detailed code introduction function PDF)

基于接收信号强度的KNN室内定位算法，还有测试数据。适合初学者参考(KNN indoor positioning algorithm based on the received signal strength, as well as test data. For beginners)

基于802.16e 协议标准的LDPC码编码解码方法，采用C语言，码率，迭代次数可变(Protocol standard based on 802.16e LDPC code encoding and decoding method using C language, bit rate, variable number of iterations)

说明：  ：载波频率偏移是OFDM系统实现的关键问题之一。分析了OFDM 系统载频偏移估计的2 种算法，即利用循环前缀和训练序列方法。它们均为最大似然估计方法。分别讨论了它们的基本 思想、实现方法和仿真结果。可以看出基于循环前缀算法复杂度较小，精度不高，而基于训练序列 的算法有较高的估计精度，但降纸了系统传输效率。(Abstract：Carrier frequency ofset is one of the key problems in OFDM system．Two foundational methods 。cycling prefix—based and training sequence—based algorithms。to estimate OFDM carriers~equency ofset are analyzed．Then it discusses their basic thoughts。implementing methods and simulation resuits． Finally。merits and demerits of every algorithm are supposed．It concludes that the cycling prefix— based algorithm has less complexity and less precision。and that the training sequence—based algorithm has better estimation performance at the cost of transmission efficiency．)

matlab实现的fft程序，可酌情作为参考(Matlab implementation of the FFT program, as appropriate, as a reference)

将压缩感知应用于基于训练序列的信道估计中，代码展示了压缩和估计过程。(Will be used in compressed sensing training sequence based channel estimation, the code shows the compression and estimation process.)