Channel use is a quantity used in signal processing or telecommunication related to symbol rate and channel capacity.
Capacity is measured in bits per input symbol into the channel (bits per channel use).
If a symbol enters the channel every Ts seconds (for every symbol period a symbol is transmitted) the channel capacity in bits per second is C/Ts.
The phrase "1 bit per channel use" denotes the transmission of 1 symbol (of duration Ts) containing 1 data bit.
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