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003CDMA系统性能分析与仿真  论文
双击自动滚屏 文章来源:   发布者:jsjlw99   发布时间:2009/7/8 15:27:01   阅读:2907

CDMA数字蜂窝移动通信系统由于其具有良好的通信性能,已成为近年来国际上研究的热点之一。扩展频谱通信是具有广阔发展前景的通信方式之一,并广泛应用于军事通信和民用通信中。
码分多址接入CDMA(Code Division Multiple Access)方式以频谱利用率高、抗多经、抗干扰、软容量、低功率、软切换、宏分集、频率规划简单以及用户接入方便等其它多址技术不可比拟的优越性被认为是未来移动通信系统的理想接入技术之一。
能够提供大的系统容量是CDMA通信技术一个突出优点,CDMA系统的容量是干扰受限的,降低干扰可以直接增加其系统容量,这可以通过提高扩频增益实现。当然,通过一些其它技术如功率控制、语音激活、抗多径衰落等也可以增强其系统容量。
本文首先全面分析了CDMA通信技术的各项性能指标;然后研究了决定和影响其系统容量的各个参数,以及系统容量的各种增强技术;最后结合仿真图形加以分析说明,用实验结果论证了理论分析的正确性。
 
关键词: 移动通信,CDMA,系统容量
 
 
 
 
 
 
 
 
 

ABSTRCT

CDMA digital cellular mobile system has remarkable communication performance. It has been one of the hottest research topics in recent years. Spread Spectrum communication became one of the communication ways with wide developing prospect, and has being applied to military communication and civil communication extensively.
CDMA (Code Division Multiple Access ) is one of the promising technology for future mobile communication system because of its several feature with which other multiple access technology can not compare: higher efficiency of frequency allocation, robust ani-multipath effect, macro diversity mitigating interference, soft capacity low power, soft handoff simple frequency design, easy access, and so on.
One of the projecting advantage of CDMA is which can provide a large capacity of system. It’s capacity is limited by the interference of system. If we can reduce the interference by raise the multiple of spreading frequency band, there will be a rise of the capacity. Of course, there are still any other ways to increase the capacity, such as controlling efficiency, activating voice , decline interference of multiple channels.

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