A channel achieves b bit/sec data stream using
A channel achieves b bit/sec data stream using f MHz bandwidth and an n-level signal. The channel is reconfigured to use f′ MHz bandwidth and a n/2-level signal, but yet maintains a b bit/sec data stream. What is f′? Justify your answer.
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Why do you suppose we use Koch's postulates instead of something called 'De Bary's postulates?
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