| 摘要 |
<p>Multistage decoder for decoding received symbols and made up of symbols having undergone a multilevel coding according to several successive levels for partitioning a constellation into several subsets. Since each symbol of the constellation is coded over several bits, each stage (621, 622, 623) of the multistage decoder determines a sequence of bits relating to a partition level, doing so for a sequence of estimated symbols closest to the received symbols. The decoder is noteworthy in that, for at least one stage (621, 622, 623), decision means (631, 632, 633) generate, for the estimated symbols, a deletion bit whenever a received symbol lies within a predetermined deletion zone, the stage decoder later correcting the deletion bits. The decoder can operate in adaptive or non-adaptive mode. The deletion zones can be angular sectors or strips of constant width. Application: digital signal transmission. <IMAGE></p> |
