Method of equalization in digital mobile communication with improved tracking ability

摘要

A method of equalization in a digital mobile communication capable of realizing an improved tracking of the variations of the transmission path characteristics, such that it becomes possible to achieve the good error rate characteristic. In the method, the forward and backward equalizations are carried out, while the forward and backward evaluation functions indicating reliabilites of the forward and backward equalizations are calculated by using the signal sequence, and a final equalization output is obtained by selecting for each bit of the signal sequence one of the forward and backward equalization outputs for which the reliability indicated by corresponding one of the forward and backward evaluation functions is higher as final equalization output for each bit. The detection of an abnormal state such as a sudden drop of a signal strength of the signal sequence or a limit cycle state of an equalizer may be used instead of the evaluation functions.