OCR

am mod used to modulate an am signal

说明：  5. 在三条径的瑞利信道中，对于直接序列扩频： (1) 请设计DS-CDMA一种具体的码分导引辅助的信道估计方法，接收机分别采用等均益合并、最大比合并。用Simulink进行仿真，测量BPSK的误码率性能，画出比特信噪比与信道估计均方误差的关系曲线，画出比特信噪比与误码率的关系曲线，请解释在误码率为0.01时，两种合并方式所表现的不同的物理意义。 (2) 设频率已经同步，请设计DS-CDMA一种具体的单停顿滑动相关时间同步方法，用Simulink进行仿真(自己编写代码S-Function方式)，分析所设计方案的时间同步精度，画出比特信噪比与捕获概率的关系曲线。 (3) 设时间已经同步，请设计DS-CDMA一种具体的频率同步方法，用Simulink进行仿真(自己编写代码S-Function方式)，画出比特信噪比与频率同步误差的关系曲线。 (5 In the three path Rayleigh channel, for direct sequence spread spectrum: (1) Please design a specific DS-CDMA code division guide-assisted channel estimation, receiver, etc were used to benefit the merger, the maximum ratio combining. With the Simulink simulation, BPSK BER performance measure, draw-bit signal to noise ratio and channel estimation mean square error of the curve, draw the signal to noise ratio and bit error rate curve, please explain in bit error rate 0.01, the two methods are combined performance of the different physical meaning. (2) frequency has been set up synchronization, a specific design of DS-CDMA single-stop sliding correlation method of time synchronization, simulation with Simulink (S-Function code their own way), analyze the design of time synchronization accuracy, draw bit signal to noise ratio and capture probability curve. (3) set time has been synchronized, a specific design of DS-CDMA frequency synchronization method, simulation using Simulink ()

自编的龙格库塔算法，方便学习数值分析的同学自学本算法，没有调用MATLAB自带的库函数。(the algorithm of numerical analysis, not the library function call MATLAB)

Azimuth dependence of Doppler spectra of sea clutter at low grazing angle

说明：  基音检测,检测出语音的基音频率，采用了小波和经典方法(base tone)

模糊聚类处理过程中计算传递闭包的程序。指定行列后，自动读取Excel中数据。(fuzzy clustering)

FEM solution for microstrip

用拖布列兹MUSIC估计来波方向，及对数据协方差矩阵斜对角线上的元素进行平均再DOA估计(Using drag Boulez the MUSIC estimated to wave direction, and the average re-DOA estimated data covariance matrix oblique diagonal elements)

利用和声搜索算法对IEEE33节点进行无功优化，采用前推回代潮流计算方法(Harmony search algorithm on IEEE33 node reactive power optimization, flow calculation method using forward and backward substitution)

将矩阵中的元素替换写成function后，带入主程序运行的Matlab源码(Will replace the matrix elements after written function, into the main program running Matlab source)