Cellular Voice and Data
By far the largest category of PCS system is the group of standards used for digital cellphone networks. Although these were all designed primarily for voice, they can also support data transmission at varying rates. The data rates shown in Table 4.1 are those that use the voice circuit, usually by connecting a phone to a laptop computer. Many also include far slower data services that can operate at the same time as the user is talking, usually used to display simple text messages on the phone itself.
Most PCS systems are based on TDMA (Time Division Multiple Access). FDMA (Frequency Division Multiple Access) is too wasteful of bandwidth, while CDMA (Code Division Multiple Access) had not yet been invented at the time ...
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