信道的衰落问题是限制移动通信系统性能提高的一个主要因素，本文所分

析的分集技术正是抗衰落技术中的一种。

        本文首先对分集技术的产生背景，分集技术在工程和理论研究中的重要作用作了概要性的总结。 同时，文章也对已有的各种分集实现方法和分集支路处理方法进行了系统地总结和归纳，主要分析了它们的基本原理，并结合衰落信道的一般理论，对其中一些关键参数作了分析。这些分析的结论表明，分集技术能够有效的改善宽带移动通信系统的性能。最后，我也对RAKE接收机进行了简单仿真。

 

 

   

关键词：分集技术，宽带移动通信系统，衰落信道，分集实现形式

 

 

 

 

 

 

 

 

 

ABSTRACT

 

    One major factor that degrades the performance of mobile communications system is fading，the diversity technique studied here is one of the anti-fading technologies.

    This paper first reviews and summarizes the background of the diversity technique, its importance in practical and theoretical use. A systematical study of the methods used to realize diversity and process sub-channel fading signals is also made, Their basic principles are analyzed. Some key parameters are discussions are used to compare these methods. The results show that diversity can greatly improve the performance of the system, for which it wins wide use. Finally, I simulated the RAKE receiver simply.

 

 

KEY WORDS:  diversity technique, wide-band mobile communications system, fading channel, form of realizing diversity
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