Timeline for Can an OFDM signal be demodulated at a sample offset over the cyclic prefix?
Current License: CC BY-SA 4.0
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| Mar 28, 2022 at 1:41 | history | edited | Dan Boschen | CC BY-SA 4.0 |
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| Mar 27, 2022 at 22:42 | comment | added | BigBrownBear00 | Would be very beneficial as it’s critical for making any implementation work | |
| Mar 27, 2022 at 21:13 | comment | added | Dan Boschen | Yes it makes sense that you can’t average the phase as it is the linear phase slope that you are trying to determine - is that the detail you want me to add? Best solution in case of AWGN is a least squares linear fit. | |
| Mar 27, 2022 at 20:41 | comment | added | BigBrownBear00 | I verified this through simulation, thank you! Can I request you add some detail on the application of correction from the pilots? It's important to note that this technique falls apart if you average the phase error using evenly spaced pilots. You need to interpolate the pilot phase values over the duration of the useful period. This is a small but very important detail. | |
| Mar 27, 2022 at 15:03 | vote | accept | BigBrownBear00 | ||
| Mar 27, 2022 at 14:58 | history | edited | Dan Boschen | CC BY-SA 4.0 |
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| Mar 27, 2022 at 14:52 | history | edited | Dan Boschen | CC BY-SA 4.0 |
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| Mar 27, 2022 at 14:45 | comment | added | Dan Boschen | Equalization is a whole other topic. For this question, assume the data is equalized and that you have an offset such that you get the last sample from the CP and the remaining N-1 samples from the actual data, and this is the time block you pass into your FFT in the receiver: The result will be the same with the additional linear phase introduced that I mentioned and with that you can use the pilots to measure that phase and make that correction. | |
| Mar 27, 2022 at 14:41 | history | edited | Dan Boschen | CC BY-SA 4.0 |
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| Mar 27, 2022 at 14:23 | history | edited | Dan Boschen | CC BY-SA 4.0 |
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| Mar 27, 2022 at 14:02 | history | answered | Dan Boschen | CC BY-SA 4.0 |