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The noise of interest would ultimately be over the bandwidth of your signal and specifically all filtering done prior to ultimately making a decision over which symbol was transmitted- which would typically be the bandwidth of your matched filter. So given a noise density in $dBm/Hz$ you can translate that to the total noise in the signal to noise ratio of ...


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MBaz answer gives the limit but I thought to give another perspective. For #2, I am really thinking you might be talking about Nyquist ISI Criterion (https://en.wikipedia.org/wiki/Nyquist_ISI_criterion) . $\frac{1}{T_s}\sum_{-\inf}^{+\inf}H(f - \frac{k}{T_s}) = 1$ The $H$ includes your channel as well as rrc filtering. So here, your transmit signal BW $\...


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The two guiding principles are: In order to transmit at rate $R_p$ baud with no ISI, we require a bandwidth $B \geq R_p/2$, with equality only for sinc pulses. It follows that, given bandwidth $B$, the maximum rate is $R_p = 2B$. A signal with bandwidth $B$ is subject to flat fading if and only if $B < B_c$, where $B_c$ is the channel's coherence ...


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It is null-null when the signal is bandpass and zero-null when the signal is baseband. So you will always take the positive frequencies.


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