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Mobile Wireless Communications by Mischa Schwartz

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Chapter 5Modulation techniques

We have stressed thus far in this book basic system concepts in mobile cellular systems. We have discussed the propagation environment and modeling thereof, the use of geographically assigned cells to increase capacity by channel reuse, and, finally, in the last chapter, the use of dynamic channel allocation and power control to improve system performance. Implicit in all of this was the assumption that users communicate over assigned channels. Depending on the system under study, a channel can be a frequency band, a time slot in a frequency band, or a unique code, a sequence of defined binary symbols. In each of these cases, communication is carried out using a specified carrier frequency, with various modulation ...

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