Signal Processing - Safran CORTEX Series User Manual

Three choices are possible concerning the output routing:
m = 100 %, n = 0 %: channel A is directly routed to the output. No combining is performed.
-
- m = 0 %, n = 100 %: channel B is directly routed to the output. No combining is performed.
m and n are dynamically adjusted by the combining system. This is described in the "Signal
-
processing" section.
3.5.3

Signal Processing

When both channels are locked, the combining system identifies and compensates the relative phase
ambiguity before combining. The supported modulations are QPSK, OQPSK and 8PSK.
Two combining modes exist:
- Best channel: only the signal of the channel with the best Eb/N0 is fed through the combining
system.
Combining: signals of both channels are combined using optimal weighting. In this case, the
-
combining gain versus the best channel is:
   
Eb  Eb
N N
0 0
( dB )
combining
The relative amplitude of a channel (A or B) is given by:
Amplitude
Amplidude _ Channel _
The sum of the relative signal amplitudes is 100. The best case (3-dB gain) is achieved when both IF
Receivers are locked onto equal-strength signals.
© Safran Data Systems – IMP000074 e14r1
HIGH DATA RATE RECEIVER
HDR-4G+ USER'S MANUAL

10 Log
( dB )
best _ channel
_ Channel

A Amplitude _ Channel
Ref.
Is.Rev
Date:

 Level ( dBm )
worst _ channel
1 10
10
x 100
_ B
Safran Data Systems
This document is the property of
It cannot be duplicated or distributed without expressed written consent.
DTU 100782
3.5
June 1, 2021


Level ( dBm )
best _ channel
10
.
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