Method for transmitting digital data via a transmission channel which is subject to interference occurring in bursts

摘要

In the method according to the present invention in which digital data is transmitted via a transmission channel 2 where interference is likely to occur in the burst, a soft-decision decoding step 9 ). To determine the signal quality, a plurality of defined received symbols are tested to determine whether they are within a predetermined distance from constellation points. The number of symbols placed in such a predetermined distance can be used for subsequent soft-decision decoding as a quality value. Thereby, characteristic curves 16.1 to 16.3 involving the bulges 17.1 to 17.3 are obtained. Symbols with relatively low noise levels are relatively overestimated, while those with relatively high noise levels are relatively underestimated.