Description: When the channel is time-varying channel capacity has multiple definitions, depending on what is
known about the channel state or its distribution at the transmitter and/or receiver. These definitions
have different operational meanings. Specifically, when the instantaneous channel gains, also called the
channel state information (CSI), are known perfectly at both transmitter and receiver, the transmitter can
adapt its transmission strategy (rate and/or power) relative to the instantaneous channel state.
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Ergodic capacity .pdf
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