L27 - outrageously expensive.) Ans: Make w_a, w_b, w_c as...

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An even more practical scenario: An antenna tower may like to broadcast several radio stations at the same time. How to achieve this goal? Ans: Frequency-Division Multiplexing (FDM) Multiplexing: Different users/signal sources would like to "share" the same media with minimal quality degradation. FDM: A special type of multiplexiing such that mutlplexing is achieved by dividing the usage of the media by "frequencies."
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How to squeeze in as many radioi stations as possible? (Licensed frequency bands are
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Unformatted text preview: outrageously expensive.) Ans: Make w_a, w_b, w_c as close as possible, but not too close. Observation: any real signal is (conjugate) symmetric. It seems that when we use the AM to transmit, we waste double the frequency to transmit the same data. Motivation: Can we squeeze in more radio stations by taking advantages of the above observation? (Bandwidth is very expensive.)...
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L27 - outrageously expensive.) Ans: Make w_a, w_b, w_c as...

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