摘要
正交频分复用(OFDM)是第四代移动通信的关键技术,以其为基础的地面数字电视传输技术也已经发展得比较成熟。它具有较高的频谱效率和抵抗多径的能力,这使其在无线通信中的应用也具有相当的优势,已成为目前解决高速数据传输的主流技术之一。本文介绍了OFDM的基本原理和主要结构,并以DVB—T标准的2K模式作为参考,使用MATLAB语言实现了OFDM系计算机仿真仿真。最后给出在不同的信道条件下,保护间隔对OFDM系统星座图、误码率的影响,得出了较理想的结论。
Orthogonal frequency division multiplexing（OFDM） is a key technique of the fourth generation mobile communication.The terrestrial digital television transmission technology based on the OFDM technique has be developed more mature.It has high efficiency and resists the multi-path fading.Thus its application in wireless communication has considerable advantage and has one of the current mainstream technologies to solve the high-speed data transmission.The basic principle and main structure of OFDM are introduced in the paper.Based on the 2k model of DVB-T standard as reference,computer simulation of OFDM system is realized by the MATLAB.Finally in the different channels,the influence of the guard interval on the constellation and error rate of the OFDM system is also given.The ideal conclusion is drawn.
出处
《中国传媒大学学报（自然科学版）》
2010年第2期45-49,共5页
Journal of Communication University of China：Science and Technology
