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Signal Processing

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  • $\begingroup$ In this case as the signal is downsampled from 2.5 Ghz to 1 MHZ would this mean I could use this simpler approach? In addition do you have any book recommendation to learn more about these topics ? Thanks for the answer I will check as well the links you suggested. $\endgroup$ Commented Jun 19, 2023 at 0:21
  • $\begingroup$ Downsampling (resampling from a higher sampling rate to a lower one) is not the same as downconverting (translating a signal from one carrier frequency to another). What is actually done depends on the receiver you have- if you can determine the chipset you may be able to learn a lot from the manufacturers data sheets and app notes. That will likely lead to other questions that you can post here (keeping the posts here to specific Q&A as you progress). $\endgroup$ Commented Jun 19, 2023 at 11:21
  • $\begingroup$ Well according to the manufacturer and the BLE 5.3 specification for AoA, the signal is downconverted into baseband and the IQ samples are taken with 8 MSps directly on the baseband signal. I will conduct further experiments. On the side note I found very useful the book from Dr. Van Trees: Optimum Array Processing. $\endgroup$ Commented Jun 19, 2023 at 12:45
  • $\begingroup$ Perfect - then yes then what I wrote will well apply. Be aware that there will inevitably be a carrier offset which is a phase ramp with time (frequency is a change in phase divided by a change in time; d_phi/dt), so carrier recovery can remove both frequency and phase offsets. $\endgroup$ Commented Jun 19, 2023 at 22:39