cs

说明：  matlab实现STBC的MIMO-OFDM的系统级仿真(Simulation of STBC MIMO-OFDM System with MATLAB)

GMSK和MSK调制解调系统的眼图，误码率图，很好(GMSK and MSK modulation and demodulation system eye diagram, bit error rate figure, very good)

说明：  用于通信方向中的信道估计，使用的语言是matlab(Used for channel estimation in the communication direction, the language used is matlab)

MIMO指多输入多输出，MIMO技术大致可以分为两类：发射/接收分集和空间复用。传统的多天线被用来增加分集度从而克服信道衰落，具有相同信息的信号通过不同的路径被发送出去，在接收机端可以获得数据符号多个独立衰落的复制品，从而获得更高的接收可靠性。这种技术往往要结合多天线技术，而多天线技术在移动通信中得到了广泛的研究。(MIMO refers to Multiple Input Multiple Output, MIMO technology can be broadly classified into two categories: transmit/receive diversity and spatial multiplexing. Traditional multi-antenna was used to increase the degree of diversity to overcome channel fading, the signal with the same information through different paths have been sent in the receiver-side data symbols can be multiple independent copies of the decline, which was higher reception reliability. This technology often have to combine multi-antenna technology, and multi-antenna technology in mobile communication has been widely studied.)

说明：  基于matlab实现的循环谱估计算法，可以对具有循环平稳特点的信号进行参数估计，如直扩信号和周期调制信号(The cyclic spectrum estimation algorithm based on Matlab can estimate the parameters of signals with cyclostationary characteristics, such as DS-SS signals and periodic modulated signals)

变步长的LMS滤波器设计，一种新的变步长LMS自适应滤波算法(Design of variable step size LMS filter, a new variable step size LMS adaptive filtering algorithm )

costas环matlab仿真，已经通过验证可行(Costas ring matlab simulation, has been verified feasible)

国家环保总局污染源在线通讯协议的简化版，主要用于环保污染监测设备的数据上传(Sources of the State Environmental Protection Administration of the simplified version of online communication protocols, mainly for environmental pollution monitoring equipment, data upload)

基于matlab软件的窄带干扰抑制及信号去噪代码(Based on the matlab software narrowband interference suppression and signal denoising code)

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)