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Re: Somone Please help me in Understanding the Pilot isertion in ofdm matlab Code
Hello.
I have probably not run that code on my PC, that was long ago and I don't remember.
64QAM differs from 16QAM only in number of magnitude/phase manipulation levels, so nothing may be changed for pilot...
Maybe I dont understand. What do you want to do?
If you have a real signal (vector of samples) and want to find a instant phase for every sample, then read about analytic signal and hilbert transform, or you should have a quadrature receiver.
Or what else?
In MATLAB there is just a sum of L consequent fft results. M - if my suggestion is true, just take from fft result of length K. 0...M-1 or 5...M+4 for example. This is dependent on lower frequency of band of interest. Total K bins of fft result are from 0 to fs (sampling frequency) with the...
I think you dont need such a high sample rate for such a low cutoff. Just try to decimate, filter at lower rate (this reduces the order) then upsample back to 10K. The easy way. More complex one - to use a special decimation and interpolation filters cascaded (multi-rate as FvM said), they dont...
I think the modulation technique may be various, but nothing conceptually new - guess OFDM, QPSK, nQAM and that is all.
I think physical layer now reaches its limit and the further quality of service improvement can be based only on upper OSI levels optimization.
The filter arithmetics uses a tapped delay line so its output grows slowly and reaches maximum at the delay equal to half a length. For 40 order it is 20 samples.
If you dont want distorted signal just take two sinewave periods and remove first from analysis at the output. And dont delay input...
I tried your model but were tired of waiting the end of estimation.
Why do you want such a great sample rate? It is not needed for that kind of filter.
Downsample 100 times (Fs = 65 khz) and it works great, you may get your 200 dB.
Top branch is just a shift register. It works at input rate.
And what rate are you waiting at the output?
And what the interpolated samples should be placed between?
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