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Mobile Wireless Communications by Mischa Schwartz

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Chapter 6Multiple access techniques: FDMA, TDMA, CDMA; system capacity comparisons

We used the term “channel” rather abstractly in our discussion of FCA and DCA in Chapters 3 and 4. In this chapter we make the concept more concrete and provide examples of different types of “channels” used in current cellular systems. The word channel refers to a system resource allocated to a given mobile user enabling that user to communicate with the network with tolerable interference from other users. Channels are thus implicitly orthogonal to one another. The most common types of channels adopted for cellular systems are frequency channels, time slots within frequency bands, and istinct codes. hese three different ways of providing access by multiple users ...

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