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the difference between the upper and lower frequencies in a contiguous set of frequencies

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Why does QASK with a same bitrate as BASK use only half of the bandwidth?

What you have to think about is how efficiently you can send bits over a fixed bandwidth with both schemes given the facts given above. … +a_i \sin(2 \pi 75 t) + + a_n \sin(2 \pi 100 t)$$ now $s_1(t)$ has a bandwidth that is half of the bandwidth of $s(t)$. …
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