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。
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.