sem4_ofdm_19th_jan

此代码实现matlab画图时添加两个纵向游标（可以拖动）来实现同一横坐标幅度的对比，里面有测试程序。(This code implements the MATLAB drawing added two vertical cursors to implement rate comparison)

LDPC码的经典的译码程序：BP译码算法(Classic LDPC code decoding procedure: BP decoding algorithm)

宽带信号方位估计的克拉美罗界，研究CRB与SNR及方位角的关系。(Wideband signal DOA estimation Cramer Rao Bound, Relationship CRB and SNR and azimuth.)

非刚性ICP 三维网格模型的配准计算,使用径向基函数计算局部变形(non rigid ICP)

基于chebyshev的水声信号分析，使用起来非常方便，单径或多径瑞利衰落信道仿真，最小二乘回归分析算法，有PMUSIC 校正前和校正后的比较，包括脚本文件和函数文件形式。( Based chebyshev underwater acoustic signal analysis, Very convenient to use, Single path or multipath Rayleigh fading channel simulation, Least-squares regression analysis algorithm, A relatively before correction and after correction PMUSIC, Including script files and function files in the form.)

说明：  采用牛顿法通过matlab编程求解多维非线性方程组(Solving a multidimensional nonlinear equation by the Newton-Raphson method by MATLAB coding.)

用于实现粒子群算法的matlab工具包，带有一些测试函数(particle swarm optimization toolbox for matlab)

对LFM雷达信号及其目标回波进行仿真，并对其干扰进行了仿真(On LFM radar signal and target echo simulation and a simulation of its interference)

各种雷达信号处理的代码，全部都能用，有助于对雷达信号的学习。(A variety of radar signal processing code, all of them with the help of radar signals learning.)

Construct the short length of QC LDPC codes without girth 4 and girth 6(The Program to construct the short length of QC LDPC codes without girth 4 and girth 6 Copyright (C) Yang XIAO, Jun FAN, BJTU, July 26, 2007, E-Mail: yxiao@bjtu.edu.cn. This program presents an approach [1] for constructing the short length of LDPC codes with girth 8. First, we design 3 submatrices with different shifting functions given by our schemes, then combine them into a matrix according to our approach, finally, expand the matrix into a desired parity-check matrix using identity matrices and cyclic shift matrices of the identity matrices. The simulation results in AWGN channels show that the codes which can be obtained by the generator matrix derived from this check matrix for encoding the random information bits are as good as random LDPC codes [1]. Ref: [1] J. Fan, Y. Xiao, “A design of LDPC codes with large girth based on the sub-matrix shifting”, IET International Conference on Wireless Mobile and Multimedia Networks Proceedings (ICWMMN 2006), (CP525), p. )