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qgis 地图二次开发，为初学者尽快掌握地图开发。对大家有很大帮助(Two the development of QGIS map, for beginners to quickly master the map development. There is a great help to you)

说明：  生成复杂网络，便于下一步进行随机攻击和蓄意攻击使用(It can generate complex network for random attack and deliberate attack)

这是一个将语音信号通过DPCM编码传输的仿真测试程序，内有详细注释，希望对大家有用。(This is a voice signal transmission through the DPCM code simulation testing procedures, with detailed notes, We hope that the right useful.)

实现雷达的恒虚警检测，采用的是CA-CFAR，内有部分注释(The CFAR detection of radar is implemented by CA-CFAR.)

说明：  解析法计算变压器的漏磁场，对于变压器漏磁损耗及温度计算具有一定的参考价值(The analytical method to calculate the leakage magnetic field of transformer has a certain reference value for the calculation of magnetic leakage loss and temperature of transformer)

第一次作业_基于分类算法的雷达状态识别 对于本数据集中的雷达状态识别，数据降维前使用朴素贝叶斯、支持向量机、神经网络的分类算法对于识别的准确率无太大影响；数据降维后使用神经网络算法最优，支持向量机算法其次，朴素贝叶斯算法较差。此外，训练样本越多，分类准确率有小幅度提高。(First Operation Radar State Recognition Based on Classification Algorithms For radar state recognition in this data set, the classification algorithm of Naive Bayesian, Support Vector Machine and Neural Network before data dimension reduction has little effect on the accuracy of recognition; Neural Network algorithm is the best after data dimension reduction, Support Vector Machine algorithm is the second, Naive Bayesian algorithm is the worst. In addition, the more training samples, the smaller the classification accuracy.)

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)

QPSK定时同步代码，采用Gardner定时同步算法，Farrow插值算法(QPSK timing synchronization code, using Gardner timing synchronization algorithm, Farrow interpolation algorithm)

说明：  大规模MIMO中采用天线选择来降低系统复杂度和成本，其中包括最优天线选择和递减天线选择，快速天线选择和基于范数的天线选择算法。(Antenna selection is used in large-scale MIMO to reduce system complexity and cost, including optimal antenna selection and decreasing antenna selection, fast antenna selection and antenna selection algorithm based on norm.)

恒频恒压(CVCF)逆变电源的输出电压波形质量是衡量其性能的重要指标之一。文章采用一种重复控制和双闭环控制相结合的电压波形控制策略，以重复控制器提高逆变电源输出电压的稳态精度，减小总谐波畸变率；以双闭环控制器达到较快的动态响应速度。该方案在一台采用TMS320F240 DSP控制芯片的50 Hz三相PWM逆变器上得到验证。(Constant voltage constant frequency (CVCF) Inverter output voltage waveform quality is an important measure of its performance indicators. Paper using a repetitive control and the combination of double closed loop control voltage waveform control strategy to improve the repetitive controller output voltage inverter steady-state accuracy and reduce total harmonic distortion to achieve a faster dual-loop controller dynamic response speed. The program uses TMS320F240 DSP in a 50 Hz phase control chip PWM inverter has been to verify.)