中文摘要：

正交频分复用（OFDM）应用于卫星宽带通信,前提需建立适用的卫星信道模型,目前常用的卫星信道模型主要为窄带模型,因而宽带系统性能分析的基础,首先得建立卫星信道宽带模型。对已有陆地移动卫星（LMS）信道模型进行研究,提出了一种便于仿真实现的四状态宽带信道模型,以此仿真得到OFDM在LMS信道下的BER性能结果。结果表明,宽带状态和窄带状态下BER性能变化较大,在不同环境下的BER性能亦有不同,可将该模型应用于卫星宽带通信的研究分析。

英文摘要：

Using OFDM in satellite wideband communication needs a suitable wideband satellite channel model.At present commonly used models are narrowband ones.The performance analysis of wideband system is based on the correct design of a channel model.Research the existed LMS channel model,and propose a 4-state wideband channel model to get the BER performance of OFDM in LMS channel.The results from simulation demonstrate that BER performance of the wideband state differs from that of the narrowband state.The BER performance of different environments also differs from others＇.This model is suitable for studying satellite wideband communication.