sm3

关于超宽带无线电基础的介绍以及相关代码，内容详细，通俗易懂，可供大家使用，互相学习。(On the introduction of ultra-wideband radio base and related code, detailed, easy to understand for everyone to use, learn from each other.)

OFDM simulation system use different modulation technique such as M-PSK M-QAM user can select that type . the program use image to be transmitted in QI mapped ,signal affected by AWGN and Fading on channel be for received

LDPC的矩阵生成，准循环码矩阵的生成，采用PEG算法生成，使用块矩阵方法(produce QC-LDPC matrix)

接收端采用的算法和程序流程与发送端发送的OFDM符号的帧结构有关系。具体的帧结构，以及定时估计，频偏估计，剩余误差跟踪的算法可参考算法说明文档。这里对程序的流程进行说明。 首先根据短训练字的特性进行相关运算，进行信号到达检测，当检测到相关值大于门限一定次数后，认为有信号到达。然后根据长训练字的特性，进行相关运算，进行OFDM符号FFT窗口起始位置的估计。估计出FFT窗口的位置后，先在时域进行小频偏的估计，将两个长训练字进行小频偏补偿后，进行FFT运算，根据FFT运算的结果进行整数倍频偏的估计。这些参数估计完成后，就可以进行数据解调了。先对数据部分进行完整的频偏补偿，然后根据估计的FFT窗口位置进行FFT运算得到频域的数据，进行解调。然后在对应于导频的子载波位置上提取出导频信息，根据导频信息估计出剩余定时误差以及剩余的信道响应误差，将误差量送入环路进行跟踪。当收到所有数据后，重新回到信号到达检测状态，进行下一次信号到达的检测和信号接收。 (good)

说明：  无线通信系统中经典的功率控制博弈论算法matlab实现。(The classical game theory algorithm of power control in wireless communication system is realized by MATLAB.)

说明：  实现了8PSK的调制，画出了时域及频域信号波形，以及8PSK的星座图。(The 8PSK modulation is realized, and the time domain and frequency domain signal waveforms, as well as the 8PSK constellation diagram are drawn.)

这个文件是讲大规模MIMO的scm模型的。代码容易看看懂(this document descpbe)

说明：  此工程用Visual Studio 2019 编写，目的是用来替换Thorlabs公司自己的GUI Kinesis来控制TDC001伺服电机控制器,方便用户自己控制。(This project is written in Visual Studio 2019. The purpose is to replace the GUI kinesis of thorlabs company to control the tdc001 servo motor controller, which is convenient for users to control by themselves.)

针对MIMO-OFDM系统中期望最大化(EM)信道估计算法在高信噪比(SNR)下带来的误差地板(EF)现象,且OFDM符号的数据传输效率随发射天线数的增加而明显降低,提出一种改进的高效EM信道估计算法。该算法首先引入一种准确的等效信号模型并推导出一种修正的EM算法,改善了EM算法在高SNR下的性能 在多个OFDM间利用相位正交导频序列来提高数据传输效率,同时进行联合信道估计以提高估计性能。仿真实验验证了所提算法具有更高的信道估计性能和更高的数据传输效率。(For multiple-input multiple-output with orthogonal frequency division multiplexing(MIMO-OFDM) systems,the error floor(EF) phenomenon at high signal noise rate(SNR) was induced by the expectation maximum(EM) channel estimation algorithm.In addition,the data transmission efficiency was declined obviously with the increasing number of transmit antennas.According to these problems,an improved and efficient EM channel estimation algorithm was pro-posed.Firstly,an accurate and equivalent signal model was introduc...)

说明：  用matlab编写的升余弦成形滤波器的产生及画图(Generation and drawing of raised cosine shaping filter)