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Power
Figure 1. Spectrum of IDEN Quad 16QAM
Time Division Multiple Access (TDMA) is used to allocate portions of the RF sig-
nal by dividing time into six slots, one for each unit. Time allocation enables each
unit to transmit its voice information without interference from another unit's
transmission.
Transmission from a unit or base station is accommodated in time-slot lengths of
15 milliseconds and frame lengths of 90 milliseconds (see Figure 2 on page 3).
2
RL 0dBm
-10
-20
-30
-40
(dB)
-50
-60
-70
-20
OVERVIEW: Digital Modulation Technology
10 dB/
-10
0
Frequency from Desired Channel Center
(kHz)
10
20
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