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?


1 Answer 1


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.

  • $\begingroup$ 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
    Commented May 16, 2019 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. $\endgroup$ Commented May 16, 2019 at 18:48

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