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1 CDMA技术提出的背景 1989年,CDMA发源于美国,最初的设计构想是为美国蜂窝电话运营商提供大容量和高质量的无线通信方案,由于其新颖的特点、优异的性能,CDMA一出世马上就受到通信、科研、工业、运营等方面专家的注意,目前,该技术是最先进的数字通信技术之一。 目前,在移动通信系统中应用的多址技术有三类,它们是频分多址(FDMA)、时分多址(TDMA)和码分多址(CDMA)。其中,CDMA技术已经被公认为是性能最优越、最具有发展潜力的
1 Background of CDMA Technologies Originally originated in the United States in 1989, CDMA was originally conceived to provide high-quality and high-quality wireless communications solutions for U.S. cellular phone operators. Due to its novel features and excellent performance, CDMA was launched immediately By the communications, research, industry, operations and other experts attention, at present, the technology is one of the most advanced digital communications technology. Currently, there are three types of multiple access technologies used in mobile communication systems: Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA) and Code Division Multiple Access (CDMA). Among them, CDMA technology has been recognized as the most superior performance, the most development potential