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CDMA(码分多址技术)是一项扩展频谱空中接口技术。与GSM使用不同的时隙和频率来分隔呼叫不同,CDMA使用不同的编码分隔每个呼叫,增加了可用话音信道的数量与整个无线通信系统的容量。CDMA被认为是未来的无线技术,因为它能支持一系列新业务,话音品质优异,而且适用于几种无线应用,包括蜂窝移动通信,PCS(个人通信)、无线本地回路(WLL)以及卫星通信。目前, CDMA技术正在城市管理,尤其是视频监控中得到规模化应用。
CDMA (Code Division Multiple Access) is a spread spectrum air interface technology. Unlike GSM, which separates calls using different time slots and frequencies, CDMA separates each call using a different code, increasing the number of available voice channels and the capacity of the overall wireless communication system. CDMA is considered the wireless technology of the future because it supports a range of new services with excellent voice quality and is suitable for several wireless applications including cellular mobile communications, PCS (personal communications), wireless local loop (WLL) and satellite communications . At present, CDMA technology is being applied in urban management, especially in video surveillance.