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
This document is the property of Safran Data Systems.
It cannot be duplicated or distributed without expressed written consent.
Filtering 1.6.1.5
(notes 1)
Filter type Finite Impulse Response
Symmetrical (even or odd): 32 taps (even) or 31 taps (odd)
Asymmetrical: 16 taps on direct path I and Q, plus 16 complex taps (Q to I and I
to Q)
Sampling rate 2 or 4 time the symbol rate
FIR response Characteristics defined in ASCII file
Raised Cosine
Root Raised Cosine (roll-off factor programmable)
GMSK (BT factor programmable)
Shaped filter for SOQPSK
Additional filters Rejection filter HBF (sampling rate at 4 times the symbol rate with decimation
by 2 at the output)
Rejection low pass filter LPF
+/- 128 MHz @ 720 MHz IF
+/- 220 MHz @ 1.2 GHz IF
+/- 440 MHz @ 2.4 GHz IF
+/- 470 MHz @ 1.25 GHz IF
Auto-adaptability Static or Auto-adaptive: “Digital Equalization Automatic Filter”, with learn and
save mode.
About DEAF please see the additional document….
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