OFDM信号保护间隔的设计方案  

The Design Scheme of OFDM Signal Guard Interval

作　　者：叶奕亮[1] 

机构地区：[1]南京邮电大学继续教育学院,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2006年第4期50-52,共3页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

摘　　要：在无线通信中,由于无线信道的多径衰落极大地恶化了通信质量。为了达到优良的误码率性能,考虑在传送通路上产生的多径衰落状态和符号同步的位置是重要的,合适的保护间隔(G I)设计是必须的。在OFDM通信方式中,把指数函数型延迟作为多径环境的模型,从传送效率和误码率特性的角度出发,研究了关于在发送端应附加的G I长度和接收端应去除的G I长度的设计方法,在考虑同步误差时,使OFDM具有能承受多径衰落的优良特性。In wireless telecommunications, since the communication quality will be dramatically deteriorated with the multipath-fading of wireless channel, it is important to consider the multipath-fading status and the position of symbol synchronization on the transmission path. Therefore appropriate design of guard interval（GI） is of necessity. Modeling the multipath environment in OFDM communication with the delay of exponential function type, this paper investigates the design scheme of the GI length which should be attached at the transmission end and detached at the receiving end to meet the requirements of transmission efficiency and bit error rate performance. In this way, OFDM will exhibit satisfactory characteristics to combat against multipath-fading in the existence of synchronization error.

关 键 词：保护间隔 多径衰落 正交频分复用 傅里叶变换 

分 类 号：TN911.7[电子电信—通信与信息系统]