Safran CORTEX Series - 3.3 DEMODULATION

HIGH DATA RATE RECEIVER
HDR-4G+ USER’S MANUAL
Ref. DTU 100782
Is.Rev 3.5
Date: June 1, 2021
© Safran Data Systems – IMP000074 e14r1
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Page 78
Demodulation 3.3
IF Processing 3.3.1
Signal Processing:
 IF signal selection (Nominal or Alternate input).
 Automatic gain control: the signal level must be in the range –10 dBm to –50 dBm.
 Analog-to-Digital conversion of the received signal.
 IF acquisition: the programmed acquisition range must be compatible with the maximum
frequency uncertainty (Doppler shift, oscillators drift,…).
 Cable equalizer filter (see Section 3.7 ): cable loss equalizer with programmable attenuation.
 IF filtering: matched filter, adjacent canal rejection or custom FIR filters (option).
Test & Monitoring:
 A number of status enable to monitor the demodulation process at IF: IF signal level, PLL
status, carrier offset, etc…
 Spectrum analysis: allow to visualize the received signal spectrum.
 Vector analysis: check that the displayed constellation is correct and corresponds to the noise
and signal characteristics.
 Filter analysis: display in real time the pulse and frequency responses of the digital filtering.
Bit Synchronization 3.3.2
Signal Processing 3.3.2.1
 Matched filters: basic supply: Integral & Dump. Optional: Root Raised, Raised filters with
programmable roll-off factor, GMSK, user-programmable FIR filters (see next section).
 Symbol phase recovery
Test & Monitoring: a number of status enable to monitor the bit synchronization process: PLL status,
signal to noise ratio (Eb/No), etc…