OFDMA, Orthogonal Frequency Division Multiple Access is a broad band communication method. Here channel estimation is more crucial. Based on the FFT size used for OFDM transmission method that many number of channel co-efficients are to be estimated

本文在研究IEEE802.16e协议和SIP协议的基础上，提出了利用 SIP解决IEEE802.16接入网络中端到端切换的新方案。该方案采用跨 层切换的设计思想，联合MAC层和应用层SIP协议，在底层链路切换 的同时，完成应用层会话的修改，加快了切换过程，减少了切换时延， 提高了切换成功率。本文基于NS2仿真平台，完成了相应的仿真平台 搭建过程，实现了SIP协议模块和WiMAX协议模块的融合，扩展了SIP 协议模块的部分消息，最终在基于SIP协议模块和WiMAX协议的统

Matlab simulation for drawing the BER plot of the WiMAX turbo code, using either the BCJR algorithm or the fully-parallel algorithm. Copyright (C) 2013 Robert G. Maunder The simulation can be started by running the main.m scr ipt. This can