15 March 2015

CIS-112 modem 22.22 Bd π/4 DQPSK stream

CIS-112 http://signals.radioscanner.ru/base/signal229/
here another CIS-112 transmission, this time in bitstream mode. OFDM parameters are the same of the those seen about the burst mode.

Number of channels: 112 + 1 pilot tone (about 3300 Hertz)
Manipulation in the channels: pi/4 DQPSK
Step between channels (frequency net/grid): 25.6 Hz
Manipulation speed (Baud rate): 22.22

phase constellation of the 112th channel
Unfortunately, the low quality of this recording doesn't allow an accurate analysis of the modulation format used in the channels.

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