Safran CORTEX Series - Adjacent Channel Rejection; Figure 14: Effect of the XDEAF

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 85
Figure 14: Effect of the XDEAF.
Adjacent channel rejection 3.3.2.5
In case of multi-channel transmission, the combination of successive filtering processes implemented
inside the HDR:
- LPF rejection filter,
- HBF rejection filter,
- matched filter: RRC or customized equalizer filter for channel equalization,
Allows an efficient rejection of adjacent channels.
An interesting method offered by the HDR to customize the matched filter on the received signal is to
use the combination of the rejection filters and the DEAF process. In a first time a standard filter is
selected (example RRC filter) and the DEAF process is activated. When the frequency response of the
filter is stabilized, it is possible to store the parameters of the filter inside a specific file. Then, the
matched filter can be set up with the customized filter (file) constructed by the DEAF process. Refer to
$ 4.4.4.1 “Global” Window and § 4.4.4.6 “Filter” Window.