October 2012
Intermediate to advanced
368 pages
10h 14m
English
Content preview from Bluetooth Low Energy: The Developer's HandbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 5. The Physical Layer
You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat.
—Albert Einstein
5.1. Background
Two or more Bluetooth low energy devices use radio waves to send and receive information among them. Radio has been around for many years, starting with very simple spark-gap transmitters, evolving through amplitude modulation and frequency modulation, and recently, to phase-shift keying and other more complex modulation schemes.
The sections that follow provide an introduction to how radios work, ...
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