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  • Telecommunications

Regenerative repeater for satellite links

Restoring an attenuated, noisy signal in GNU Radio

Context

A simplified simulation, in GNU Radio, of a regenerative repeater as used in satellite links.

A regenerative repeater does more than amplify: it rebuilds a clean signal, instead of passing the noise on with it.

Architecture

The signal chain, stage by stage

Signal chain of the regenerative repeater uplink downlink Ground station Satellite regenerative repeater Ground station GNU Radio flowgraph · simplified simulation Attenuated signal Weak and noisy Multiplier Re-amplification Low-pass filter Noise removal Threshold comparator Reconstruction Threshold = 0 → Clean signal Signal chain of the regenerative repeater Satellite regenerative repeater Ground station uplink Ground station downlink GNU Radio flowgraph simplified simulation Attenuated signal Weak and noisy Multiplier Re-amplification Low-pass filter Noise removal Threshold comparator Reconstruction Threshold = 0 → Clean signal
The attenuated, noisy signal is re-amplified by a multiplier, cleaned by a low-pass filter, then turned back into a clean signal by a threshold comparator.

What I did

  • Re-amplified the attenuated signal with a multiplier.
  • Removed the noise with a low-pass filter.
  • Reconstructed a clean signal with a threshold comparator.

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Regenerative repeater for satellite links
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