OFDM在衰减信道内的仿真(英文)(Matlab).pdf

CSM Simulation Report NING LI OFDM In Fading Channels Communication System Modelling Simulating OFDM Communication Systems in Fading Channels Department of Electronic and Electrical Engineering MSc in Wireless and Optical Communications Author : NING LI Student NO. Date : 21/01/2015 1 CSM Simulation Report NING LI OFDM In Fading Channels 1. Introduction Multipath Fading and Simulation of Rayleigh Fading Channels In wireless communications, multipath fading is a propagation phenomenon that signals transmitted from a source arrive at the receiver antenna in two or more paths, resulting in constructive and destructive interference between signals arising from multiple paths [1]. Rayleigh fading is one of the models that are used to describe the form of fading that occurs when multipath propagation happens. When there are a large number of paths, the central limit theorem can be applied to model the time-variant impulse response of the channel as a complex-valued Gaussian random process [2]. A snapshot of the Rayleigh channel response is showed as follow: Figure 1.1: A snapshot of the Rayleigh Flat Fading [3]. The objective of the first part of this report is to build a signal model for ISI channels. In this work, L-ray Rayleigh fading channels will be simulated as the ISI channels. In the channel, power is normalized to be equal and the time delay between each ray is