Polar_code

针对OFDM系统，分成链路级仿真和系统级仿真两个部分。为了降低系统级仿真的复杂度，采用链路级仿真的部分结果。(It contains mainly two parts, i.e. link-level simulator and system-level simulator. Link-level simulator focus on a single-cell single-user scenario, where signal is transmitted from tx, and estimated at rx. Comparing the difference in tx/rx signal, the error rate can be found out. The output of the link-level simulator is the BLER/BER vs. SNR mapping table, that can be used for the system-level simulation. System-level simulator focus on a multi-cell multi-user scenario. For the sake of simplicity, it takes the mapping table aquired in the link-level simulation, measure the actural SNR, and finds the corresponding error rate. Link-level simulator support SISO, 1 by x MRC, 2 by 1 STBC/SFBC, 2 by 2 Alamouti, x by 1 Antenna selection, x by y antenna selection. System-level simulator, currently support only SISO and 1 by 2 MRC. To start with, go into the folder sys_link_simu, and excute the following commond from matlab: sys_link_simu_func(a,b) where a is the link ada)

对.prn文件的数据进行fft变换并显示出图形(Fft transform and shows graphical. Prn file data)

该程序求解水下声学定位中的加权平均声速计算(Solving weighted average sound velocity)

说明：  利用matlab编程求解瞬态问题，内容简单，利于入门(Using MATLAB programming to solve transient problems, the content is simple and easy to get started)

《MATLAB 7.X程序设计》-王建卫-源代码及习题答案，用以初学者(" MATLAB 7.X programming" - Wang Wei- the source code and problem sets for beginners)

Designs a linear phase FIR lowpass filter such that it: - minimizes the filter order - has a constraint on the maximum passband ripple - has a constraint on the maximum stopband attenuation (This is a quasiconvex problem and can be solved using a bisection. minimize filter order n s.t. 1/delta <= H(w) <= delta for w in the passband |H(w)| <= atten_level for w in the stopband where H is the frequency response function and variable is the filter impulse response h (and its order/length). Data is delta (max passband ripple) and atten_level (max stopband attenuation level). )

把轨道根数转移到对应的状态向量，在轨道中很常用。(The orbital elements are transferred to the state vector)

数字滤波器：数字信号处理及MATLAB实现(Digital Filter: Digital signal processing and MATLAB implementation)

matlab设计的FIR滤波器！包括矩形窗、Blackman窗、Hamming窗、Kaiser窗（带通）(Matlab design FIR filter! Including rectangular window, Blackman window, Hamming window, Kaiser window （Bandpass filter）)

这是IIR数字滤波器的设计及滤波程序，IIR滤波器用matlab实现，滤波数据用C生成，主程序实现数字滤波(This is the IIR digital filter design and filtering procedures, IIR filter using matlab, using C to generate filtered data, the main program to achieve digital filtering)