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第三代移动通信标准的开发始于1993年,当时美国电信行业协会(TIA)正在运行 IS-95 CDMA 技术的标准化工作。作为第二代数字移动通信标准中的后起之秀,CDMA 以 TDMA 和 GSM 无可比拟的优势,赢得了业界的钟爱,被指定为第三代移动通信标准的平台。目前,CDMA 正在全球掀起层层应用波浪,其最大的问题是解决标准的统一以及与 TDMA 和 GSM 的兼容问题。与 TDMA 和 GSM 不同,CDMA 使用的空中接口技术能够使用户通过同一频率交谈。通过软件,CDMA 将每一来话
The third generation of mobile communication standard was developed in 1993, when the American Telecommunications Industry Association (TIA) was running the standardization of IS-95 CDMA technology. As a rising star in the second generation of digital mobile communications standards, CDMA has won the industry’s love with its incomparable advantages of TDMA and GSM and was designated as the platform of the third generation mobile communications standard. At present, CDMA is laying the wave of layers of application in the whole world, its biggest problem is to solve the standard unification and compatibility problem with TDMA and GSM. Unlike TDMA and GSM, the air interface technology used by CDMA enables users to talk over the same frequency. Through software, CDMA will call each one