METHOD AND A RECEIVER IN A COMMUNICATION SYSTEM FOR DEMODULATING A MODULATION SYMBOL WITHOUT KNOWLEDGE OF THE MODULATION CONSTELLATION EMPLOYED IN A TRANSMITTER TO MODULATE THE SYMBOL BEFORE TRANSMISSION

摘要

A method of demodulating a modulation symbol in a receiver of a communication system without knowledge of the modulation constellation employed in a transmitter to modulate the symbol before transmission, comprising the steps of demodulating the symbol according to an assumed modulation constellation, interpreting the modulation symbol as a symbol of one of a family of hierarchical modulation constellations, decoding the demodulated symbol using a forward error correction (FEC) technique, checking the decoded symbol for correctness, wherein during the interpretation step Mmax -ks of the symbol bits are applied to the FEC decoder where Mmax denotes the number of symbol bits of highest order modulation constellation, Ms is the number of symbol bits of the respective assumed modulation constellation and ks is a value which varies for each assumed modulation constellation according to ks = Mmax -Ms.