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Technical Product Manual - DCT1900
System Description, Other System Aspects
5-2
System-DCT1900/R8/mw
© 2000-2005
5.3.3 Characteristics
Frequency band : 1920-1930 MHz
Number of carriers : 8 adjacent
Carrier spacing : 1.25 MHz in 1920-1930 MHz band;
Transmission : MC/TDMA/TDD (Multiple Carrier/ Time–Division Multiple Access/
Time–Division Duplexing)
TDMA frame : 10 ms
TDMA slot : 0.417 ms
No. of slots per frame : 24 (12 full duplex channels)
Total number of channels : 96 (88 available for speech)
Bit rate : 1152 kbit/s
Speech coding : 32 kbit/s ADPCM (Adaptive Differential Pulse Code Modulation)
Modulation : π /4 DQPSK (Differential Quadrature Phase Shift Keying) with RRC
baseband filtering with 50% bandwidth expansion (
∝ =0.5)