0
$\begingroup$

In satellite QPSK demodulation, we first estimate and remove the phase offset introduced by the channel. Then, we demodulate the baseband information bits (I & Q channels).

In satellite DOA beamforming, Channel can also introduce phase / frequency offset. When we detect the desired signal from a certain direction in the frequency domain (spectrum), how could we detect this channel introduced phase / frequency offset?

$\endgroup$
0
$\begingroup$

Typically, you distribute a mixing oscillator to all ground stations, so that their respective phase is known and can hence be corrected upfront. Having known phase between these receiver parts typically requires a lot of RF design effort and external phase calibration.

$\endgroup$
  • $\begingroup$ We adjust antenna array's weights to receive signals from the desired direction while suppressing interference from other directions. Is there a more practical way to estimate the phase offset introduced by the channel in all directions? $\endgroup$ – Cindy May 16 at 18:11
  • $\begingroup$ well, that boils down to channel estimation – there's a million ways to do that, and it all depends on your application and the knowledge you have about the signal you want to receive. $\endgroup$ – Marcus Müller May 16 at 18:48

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.