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Derive the LFSR sequence from demodulated bitstream

Yes you can! Given an Nth order polynomial generator, with 2N consecutive samples we can create N equations with N unknowns for the LFSR polynomial which you can then solve as a system of simultaneous ...
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Frequency-domain vs Time-domain OFDM oversampling

Your first method is just not using the subcarriers at the band edges (the ones that you zero-pad). It is hence equivalent to a sinc-interpolation in the time domain. Finally, a cyclic prefix (or ZP, ...
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Cross Ambiguity Function Peak Width

Assuming this is a RF system. What is the bandwidth of the waveform? The range resolution $\Delta R$ achieved by a matched-filtered waveform is given by $$\Delta R = \frac{c}{2\beta}$$ Where $c$ is ...
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Does Zero padding cause noise in the high frequency region?

If you've got it in the frequency domain anyway, why not phase shift it by (delay)(frequency)? It may still do odd things (like, shift whatever's at the end of the sample to the beginning), but you'...
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Does Zero padding cause noise in the high frequency region?

Is that correct? No. This zero padding just leads to interpolation with a (cyclic) sinc kernel. It affects all subcarriers the same (as you can see in your own DFT!). So, this has to be a problem ...
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the meaning of management of bandwidth and energy resources

I mean how the OFDM offers management of bandwidth and energy resources however the SCFDE almost uses the same technique to equalize the channel at the receiving end. So, the fact that OFDM offers ...
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