APPARATUS, METHOD AND COMPUTER PROGRAM OPERABLE TO DETERMINE ESTIMATES

摘要

An apparatus, a method and a computer program for determining estimates is disclosed. The apparatus determines estimates for transmitted symbols from received symbols of an optical signal affected by cross-Polarization Modulation (XpolM). The apparatus groups two or more subsequent received symbols from the optical signal into a group of received symbols and estimates an optical channel based on the group of received symbols and a hypothesis on the transmitted symbols. The apparatus further determines a reliability measure for a combination of the group of received symbols, the channel estimate, and the hypothesis, and determines the estimates for the transmitted symbols based on reliability measures for multiple hypotheses on the transmitted symbols.

主权项

1. An apparatus operable to determine estimates for transmitted symbols from received symbols of an optical signal affected by cross-polarization Modulation, XpolM, the apparatus comprising:
a grouping module operable to group two or more subsequent received symbols from the optical signal into a group of received symbols; an estimation module operable to estimate an optical channel based on the group of received symbols and a hypothesis on the transmitted symbols; a determination module operable to determine a reliability measure for a combination of the group of received symbols, the channel estimate, and the hypothesis, and further operable to determine the estimates for the transmitted symbols based on reliability measures for multiple hypotheses on the transmitted symbols.