WCDMA mainly originated from the early third generation wireless research activities in Europe and Japan. The great success of GSM has a major impact on the standardization of third generation systems in Europe. In 1988, Europe launched the RACEI (European Advanced Communication Technology Research) program, and It continued until June 1992 when it represented the beginning of the third generation of wireless research activities. The RACEII process was initiated in Europe between 1992 and 1995. ACTS (Advanced Communication Technology and Services) was established at the end of 1995 as UMTS (Universal Mobile). The communications system) proposes the FRAMES (future wireless broadband multiple access system) solution.
In these early studies, various access technologies including TDMA, CDMA, OFDM, etc. were tested and evaluated, laying the technical foundation for WCDMA. As an emerging technology, WCDMA is also based on the practice and application of CDMA technology. WCDMA is rapidly becoming global and has occupied 80% of the wireless market. As of 2013, the global WCDMA subscribers have exceeded 3.6 billion, and 156 operators in 170 countries have already commercialized 3GW CDMA services.
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