HW1_1

Investigation of Next Generation IEEE 802.11n Wireless Local Area Networks (WLAN)

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. )

说明：  MATLAB7的关于遗传算法的所有源程序祥解(MATLAB7.1 genetic algorithm on all the source code Explained)

进行T-S模型的离线辨识程序，只需要有数据，直接代入就可以辨识出T-S模型的center以及后件参数，非常实用，并有误差曲线提供分析(offline T-S fuzzy model identification，a erorr map is provided for T-S model effectivity analysis.)

Plots the irradiation diagram of a 4 isotropic elements array

球面波干涉条纹在matlab中的计算与演示并且给出强度的三维立体图(Spherical wave interference fringes in MATLAB and gives the strength calculation and demonstration of three-dimensional map)

行程编码的matlab源程序，用于实现图像压缩(Travel matlab source coding for image compression)

高压直流输电仿真模型，基于晶闸管控制的12脉波MATLAB/SIMULINK仿真(The example in this section illustrates modeling of a high-voltage direct current (HVDC) transmission link using 12-pulse thyristor converters [1]. Perturbations are applied to examine the system performance. The objectives of this example are to demonstrate the use of SimPowerSystems blocks in combination with Simulink blocks in the simulation of a complete pole of a 12-pulse HVDC transmission system. The Discrete HVDC Controller block is a generic control available in the Discrete Control Blocks library of the SimPowerSystems Extras library. In the same library you can find the Discrete Gamma Measurement block used in the inverter control subsystem.)

this is a genetic algorithm source code

Hermite插值多项式拟合Matlab程序。运用Matlab软件依据理论可画出Hermite插值图像，并求出Hermite多项式，并应用到实际问题中。(Hermite interpolation polynomial fitting Matlab program。Using Matlab software can be drawn based on the theory Hermite interpolation image, and find Hermite polynomials, and applied to practical problems.)