March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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Within these bands, the portions have been reserved for different uses:
Bands (MHz) Use Characteristics
1920–1980 and
2110–2170
Frequency Division
Duplex (FDD, W-CDMA)
Paired uplink and downlink, channel spacing 5 MHz,
raster 200 kHz. An operator needs three or four
channels (2 15 MHz or 2 20 MHz) to be able
to build a high-speed, high-capacity network
1900–1920 and
2010–2025
Time Division
Duplex (TDD, TD/CDMA)
Unpaired, channel spacing 5 MHz, raster 200 kHz.
Transmit and receive transmissions are not
separated in frequency
1980–2010 and
2170–2200
Satellite uplink and downlink
Carrier frequencies are designated by a UTRA Absolute Radio Frequency Channel Number ...
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