METRICS CALCULATIONS UTILISING PRE-STORED VALUES

摘要

The calculation of branch metrics in a reduced state trellis by pre-calculating for a trellis state a sum of products of channel coefficient values and signal symbol values corresponding to at least the oldest part of the section of the channel that is not hypothesised by the state such that the sum can be re-used in calculating branch metrics for different trellis branches leading out of different states.