Chapter 4

Communication protocols and modulation


This chapter examines various characteristics of short-range systems. It starts with the ways in which data is formatted into different information fields for transmission over a wireless link. We look at several methods of encoding the one’s and zero’s of the baseband information before modulation in order to meet certain performance requirements in the receiver, such as constant DC level and minimum bit error probability. Pre-emphasis/de-emphasis and compression/expansion circuits in voice communication devices to improve the signal-to-noise ratio and increase the dynamic range are explained. We describe the principles of spread spectrum, with details of direct sequence spread spectrum ...

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