3G is the third generation mobile communication technology, which refers to the cellular mobile communication technology supporting high-speed data transmission. Compared with the first generation mobile communication technology (i.e. 1G) and the second generation digital mobile phone communication technology (i.e., 2G), 3G mobile phone mainly combines wireless communication and internet communication technology, forming a brand-new mobile communication system. This mobile technology can handle images, music and other media forms, in addition, it also includes some business functions, such as conference call.
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1940, American actress hedy lamarr and her composer husband George Antell put forward the technical concept of frequency spectrum. This technical theory called "spread spectrum technology" (also known as code division spread spectrum technology) has brought changes to the world since then. It is this technical theory that eventually evolved into our 3G technology today, and spread spectrum technology is the fundamental principle of 3G technology. Spread spectrum is a communication technology that extends the spectrum of transmitted signals to a wider bandwidth than its original bandwidth, and is often used in the field of wireless communication.
The third generation mobile communication adopts code division multiple access technology, and now it has basically formed three mainstream technologies: W-CDMA, CDMA-2000 and TD-SCDMA. All these three technologies belong to wideband CDMA technology, and can provide data transmission rate of 2Mbius at rest. However, these three technologies have different characteristics in working mode and district-city switching.
Baidu Encyclopedia -3G