April 2016
Intermediate to advanced
430 pages
16h 33m
English
Content preview from RFID and Auto-ID in Planning and Logistics
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Radio Frequency Theory 371
35.6.2 moduLAtIon
The purpose of radio signaling is to carry some intelligent information. If a steady RF carrier is
transmitted such that the frequency and amplitude do not change, then no information is transmit-
ted beyond the fact that a RW is present in the environment. To encode intelligence onto the RW,
some property needs to change. A method of varying some property to encode intelligence is called
modulation. It is the lifeblood of carrying information within RW.
RW make this easy to do as there are only two primary properties that may be changed:
• Adjusting the power of the signal over time. Known as amplitude ...
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