пятница, 13 ноября 2009 г.

OFDM: CIS-45 Ch, Russian HDR modem signal.

CIS-45 Ch, Russian HDR modem
Ch-45+1, Br-40 Hz, Sh-62.5 Hz, PSK-2


Author: SergUA6
Band Width 2900-2950 Hz
Low Range 400 Hz, shift is possible, recieving in SSB
Baud Rate 40 Hz
n-Ary (PSK/MPSK) PSK-2 in the channel
Count of Carriers 45
Step between carriers 62.5 Hz
Pilot tone(s) 3300 Hz. In this record: ~3312 Hz
RX mode SSB

Sonograms:
pic.1 General view

pic.2 Grapical spectrum

Diagrams:

pic.3 Allocation of the channeles


CIS-45 Ch, version 2 - is OFDM signal. The perfect record of this signal's variant was sent to us by foreign colleagues (Iron). At the cost of reduction of CP length, speed of manipulation is increased to 40 Hertz, and maximum technical speed is finished to 1800 bps.