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Definition of "cut-off rate" |
a measure of reliability of a channel. At information rates below the cutoff rate, the probability of error averaged over the ensemble of randomly selected codes can be forced to zero exponentially with the block length (for block codes), or constraint length (trellis codes). The cut-off rate is less than or equal to the channel capacity. Also known as the computational cut-off rate, since for trellis codes, it is at this rate that the expected number of computations required to perform sequential decoding becomes unbounded. |
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