1.3万字 23页 摘 要 第四代移动通信系统计划以正交频分复用（Orthogonal Frequency Division Multiplexing，OFDM）为核心技术提供增值服务，它在宽带领域的应用具有很大的潜力。较之第三代移动通信系统，采用多种新技术的OFDM具有更高的频谱利用率和良好的抗多径干扰能力，它不仅仅可以增加系统容量，更重要的是它能更好地满足多媒体通信要求，将包括语音、数据、影像等大量信息的多媒体业务通过宽频信道高品质地传送出去。本文根据OFDM抗多径衰落模型的特性，分析了OFDM抗多径衰落的模型，对模型进行了一定的理论分析，并通过Matlab/Simulink软件对模型进行仿真，通过对无线衰落信道的模型分析得出，通信系统在传输过程中出现符号间干扰和信道间干扰，严重影响通信质量，然后给出了在两径和六径瑞利衰落信道以及系统中有无交织情况的仿真结果。仿真的过程及结果为实际中如何进一步优化系统参数来增强抗干扰能力提供一个依据，并缩短产品的开发周期。
关键词：正交频分复用（OFDM）；多径衰落；信道模型；多载波技术；通信仿真
Abstract
According to the OFDM anti- multi- diameters decline model characteristic, this article has analyzed the model of the OFDM anti-multi- diameters declines, has carried on a theoretic analysis of the model, and analyzes the model simulation through Matlab/Simulink software．By the wireless fading channel model analysis, the communications system appears inter- mark disturbance and the communication inter- channel jamming in the transmission process, it will affect the correspondence quality seriously, then comes about interweaves in two diameters and in six diameters Rayleigh fading channel as well as the system the situation simulation result．The simulation process and its result provide a basis of optimizing the system parameter further to strengthen the anti jamming ability in practice , and will reduce product development cycles．
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