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Wireless telephony
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First US experimental cellular telephone system tested in?
Chicago 1983
Cellular concept divides
geographical regions to cells
Cellular frequency modulation
each cell tower operates a differnet ultra high frequency (UHF)
Hierichal Cell Structure
Macro cells(10-30 miles)
Micro cells(1mile)
Pico cells (building)
All on UHF
analog voice
digital caller id
digital text msg
digital internet
all cell transmissions
on Ultra High Frequency
Wideband antennas
Antennas built into small shapes
smaller and better recievers
Are most cell phones land based?
yes
1G cell phones operated
on low UHF
2G phones
on high UHF
WHat generation do most people use today
3G
True 4G willl allow
fast HD video
Author
xryan27x
ID
114368
Card Set
Wireless telephony
Description
telephoy
Updated
2011-11-04T03:27:52Z
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