[問題] 一個通訊的問題
The capacity of a waveform channel can be approximated with a summation of
the capacities of parallel sub-channels which partition the original shaped
K
channel, i.e., C=△WΣlog [1+(sk/nk)]
k=1 2
where sk and nk are the signal and noise power at the k-th sub-channel
respectively. Assume that sk is known, and you want to “jam” the
transmission by arranging a noise distribution with total power of N,
that is, nk satisfies the constraint . What is the “best” noise
distribution that minimizes the channel capacity? (Note:
When derive your results, assume two extreme situations:
the first is to assume that the noise budget is far less than the signal
power. And the second is to assume a much greater noise power than
the signal.)
請指教Orz
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