codegen_digitizg

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：  小波分析的matlab程序，用于聚类分析，是一种不错的算法(The matlab program of wavelet analysis, used for clustering analysis, is a good algorithm)

LDPC码不同迭代次数对比。码长512，码率1/2，迭代次数分别为0，5，10，50，100.(The LDPC codes different number of iterations contrast. Long code 512, code rate 1/2, the number of iterations were 0,5,10,50,100.)

说明：  去除坏平均值的mrs预处理：在fid-a软件中从mrs数据阈值中去除坏平均信号，以获得更好的效果(mrs preprocessing for remove bad average : removes the bad average signal from mrs data threshhold in FID-A software for better result)

matlab语言写成的gps信号中ca码的互相关和自相关绘图(written in matlab gps ca code signal cross-correlation and autocorrelation plot)

GPS基线解算全过程,包括标准格式数据读取，基线解算及整周模糊度解算(GPS baseline solution the whole process, including the standard format data is read, and the whole week baseline solution Ambiguity Resolution)

adaptive_mimo_adaptive encoding and decoding depending on the channel SNR

对学习独立成分分析和人脸识别的会很有用，希望对大家有所帮助！(Learning independent component analysis and face recognition will be very useful, and they hope to be helpful to everyone!)

用卡尔曼滤波方法预测目标轨迹，能够估计目标下一时刻的位置信息(Prediction of Target Trajectory by Kalman Filter)

LDPC coded OFDM system for power line communication in the presence of both AWGN and Impulsive noise..