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Wifi uses OFDM, which uses symbols that can transport many bytes at once. That means you can't have arbitrary long packets, but always need to use the next multiple of a symbol duration.


T=0 or T=infinity. Any non-zero signal with finite length support in one domain has infinite support in the other domain. cos(wt) is only theoretically band-limited if infinite in length.


Yes, of course, you can sum them. The bandwidth of the resulting signal is simply the min/max of the individual signals. If we assume $$z(t)=x(t)+y(t)$$ Then then bandwidth of $z(t)$ will simply be $[min(f_{min},g_{min}),max(f_{max},g_{max})]$, so in general the you will have $B_z > B_x$ Keep in mind that for any real valued signal $x(t)$ the spectrum ...

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