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Capacity refers to the capability of a channel to transport data, typically measured in bits per channel usage.

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Are capacity and spectral efficiency identical for a dicrete-time digital signal?

The capacity is a property of a channel. A channel can transport no more than a certain amount of information per channel use. … It is thus strictly speaking incorrect to speak of the capacity of a certain modulation and coding scheme. …
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Assessing relative wireless channel quality using Capacity and Condition Number CDFs

What the CDF of the capacity tells you is how it distributes, which allows you to say something about the quantiles. Ergodic capacity tells you: what capacity will we see on average? … Quantiles are more relevant in practice: what capacity can we guarantee with 95% certainty? 99%? 99.9%? …
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