вторник, 17 ноября 2009 г.

OFDM: MIL-STD-188-110A 16 Channels

MIL-STD-188-110A 16 Channels
Br-75, Sh-110, 16 Channels +1 Pilot, pi/4 DQPSK


Author: SergUA6
Band Width ~2000-2100 Hz
Low Range ~570 Hz, shift is possible, recieving in SSB
Baud Rate 75 Hz
n-Ary (PSK/MPSK) pi/4 DQPSK
Count of Carriers 16 + 1 Pilot
Step between carriers 110 Hz
Pilot tone(s) ~624 Hz,shift is possible, recieving in SSB
RX mode SSB

Sonograms:
pic.1 Generall view

pic.2 Detalization


pic.3 Speed of manipulation in the channel

Diagrams:
pic.4 Phase constellation, the lower(bottom) channel


MIL-STD-188-110A 16 Channels - The representative of NATO. It is known enough signal, all parametres are defined easily, there shouldn't be any problems with an identification. Features of this record is that PSK-2 is used in all channels, within the limits of the main manipulation pi/4 DQPSK ofcourse.