exam4_2_post

这是gsm解调模块的matlab仿真，提供给各位学习和参考。(This is a gsm modem module matlab simulation, provided you study and reference.)

we will be addressing the major concerns in telecommunication nowadays which are channel equalization and echo cancellation using different adaptive algorithms in order to identify the most efficient methodology. There are a number of conventional algorithms available in literature and every algorithm has its own properties, however the aim of every adaptive algorithm is to achieve minimum mean square error at a high rate of convergence and with less complexity. The experimental results prove that Normalized Least Mean Square algorithm (NLMS) is the best for channel equalization

MAC LAYER SIMULATION IN MATLAB

IIR设计及讲解，介绍了双线性变换法，巴特沃斯变换法及滤波器设计的程序和结果。(IIR design and explain, introduced bilinear transform, transform, and Butterworth filter design procedures and results.)

MATLAB5_X程序设计语言，从基础概念讲起，到深入的语法实例讲解，非常使用(MATLAB5_X programming language, from basic concept of talk, in-depth examples to explain grammar, very use)

function S = steeringv(M,x) define steering vector free space wavelength of 15cm at resonant freq of 2GHz lamda = 0.15 d = lamda/2 inter-element spacing K = 1:M x is DOA of the received signal S = exp((-2*pi*j*(K-1)*d*sin(x))/lamda)

emd和eemd可用于信号去噪，提取瞬时频率。(emd and can be used to signal de-noising eemd extracting instantaneous frequency.)

this code is about mlp 1 layer neural network with back propagation training algorithm by using geradient descence for nonlinear system. input data are random.

莱斯信道衰落仿真，用于观察信号的误码率，通过信道发生的变化(Rice fading channel simulation, the error rate for the observed signal, through the channel changes)

《Maltab在数学建模中的应用》卓金武等，源代码，北京航空航天大学出版社(Maltab mathematical modeling，Zhuojin Wu, source code, Beijing University of Aeronautics and Astronautics Press)