Discussion
What limits the data rate of a high frequency channel even when it is open?
Answer: D
Signals arriving by several paths spread symbols in time, so the rate must be low enough that the spread is a small fraction of a symbol, and the few kilohertz of channel bandwidth caps it further. Adaptive equalisation and multicarrier modulation push the limit but do not remove it. Power, receiver noise and antenna gain affect the achievable signal to noise ratio rather than the channel's time dispersion. A limit imposed by the channel's structure cannot be overcome by improving the equipment at either end.
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