| 摘要 |
A method of calculating branch metrics for a butterfly in a trellis of a MAP-genre decoding algorithm, the method comprising providing initialised branch metrics for the transitions in the butterfly and incrementing the branch metrics with a group of data values corresponding to said transitions in accordance with control signals derived from the butterfly index and one or more polynomials describing tap positions of the encoding equipment to whose operation the trellis relates, wherein said group comprises systematic bit and parity bit values.
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