
A third system, known as Time Division Synchronous CDMA (TD-SCDMA), was dev eloped in
China. Although the Chinese rolled out both UMTS and CDMA2000, they were keen also to
have a system developed in China. Using a TDD approach, where the transmission and
reception were undertaken on the same channel but split in time, this approach has a number
of advantages to offer under some circumstances. However, its development is somewhat
behind that of UMTS and CDMA2000, and it will not be addressed in the later chapters.
Overview of the systems
Since the introduction of the first cellular telecommunications networks, many different
standards or systems have ...