METHOD OF SOFT DEMODULATION FOR 16-POSITION QUADRATURE AMPLITUDE MODULATION IN COMMUNICATION SYSTEM

摘要

FIELD: physics; communication.;SUBSTANCE: invention relates to a method of soft demodulation for quadrature amplitude modulation 16QAM in a communication system. The method is characterised by that, the received power of the traffic channel is evaluated; the carrier is removed from the received signals at intermediate frequency to obtain information I of a sequence of in-phase characters and information Q of a sequence of characters shifted by 90 degrees; different solution segments are determined and their corresponding solution curves with a certain error probability, based on the relationship of congruence of combinations between the binary sequence, introduced during 16QAM, and branches I, Q; the obtained information of the sequence of in-phase characters is evaluated as well as information of the sequence of characters shifted by 90 degrees in different solution segments using the corresponding curve solution.;EFFECT: higher quality of communication.;5 cl, 5 dwg, 1 tbl