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""Synchronous CDMA"" Synchronous CDMA (SCDMA) is one of the air interfaces of CDMA standards, it used the technology of TDMA to achieve the synchronization of the terminal's upload timeslot. SCDMA is the base of the UMTS-TDD LCR (Known as TDS-CDMA), and powerfully supported by the Chinese government. It's similar with the TDSCDMA of the special technology used, such as software radio and smart antenna. It belongs to the 2G (Second Generation Communication System).