华东师范大学学报(自然科学版) ›› 2005, Vol. 2005 ›› Issue (3): 37-43.

• 物理学 电子科学技术 • 上一篇    下一篇

衰落性AWGN 信道的OFDM 性能保护间隔的优化(英)

Bakir Mohammed,李外云，Belhachat Messaouda,刘锦高,朱守正   

  1. 华东师范大学 电子科学技术系，上海200062
  • 收稿日期:2003-12-23 修回日期:2004-04-09 出版日期:2005-08-25 发布日期:2005-08-25
  • 通讯作者: Bakir Mohammed

Guard Period Optimization of OFDM Performance over Fading and AWGN Channels(English)

Bakir Mohammed, LI Wai-yun, Belhachat Messaouda, LIU Jin-gao, ZHU Shou-zheng   

  1. Department of Electronic Science and Technology, East China Normal University,Shanghai 200062,China
  • Received:2003-12-23 Revised:2004-04-09 Online:2005-08-25 Published:2005-08-25
  • Contact: Bakir Mohammed

摘要： 阐述了OFDM系统的基本原理及保护间隔（GI）对系统的影响.首先就保护间隔（GI）参数在接收机干扰问题上起到的作用进行了讨论.然后计算了保护间隔参数的最佳值，结果表明它们对最大延迟有很强的依赖性.同时对多径衰落和加性高斯白噪声同时存在的QPSK调制情况进行了仿真，从而分别得出了GI、信噪比（SNR）、最大传播延迟和副载波数量与误码率的关系.

关键词: OFDM调制, 保护间隔, 多通道衰减, 最大传播延迟, 符号间干扰, OFDM调制, 保护间隔, 多通道衰减, 最大传播延迟, 符号间干扰

Abstract: In this paper, the principals of Orthogonal Frequency Division Multiplexing (OFDM) system was described and the effect of the Guard Interval (GI) on the system performance was studied. The role of the GI period to solve the problem of interferences that occur at the receiver was discussed. The optimum values of the GI parameter are determined, which were shown to have strong dependence on the maximum delay. A series of simulations have been carried out on Quadrature Phase Shift Keying (QPSK) modulation scheme over multi-path fading and Add White Gaussian Noise (AWGN).The relationship between Bit Error Rate (BER) performance and GI, Signal to Noise Ratio (SNR), the maximum delay spread and number of Sub-carrier was studied.

Key words: guard interval, multi-path fading, maximum delay spread, intersymbol interference, OFDM modulation, guard interval, multi-path fading, maximum delay spread, intersymbol interference

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