Apparatus and method for calculating soft decision

专利名称：Apparatus and method for calculating soft

decision value input to channel decoder in adata communication system

发明人：Sang-Hyuck Ha,Min-Goo Kim申请号：US10244598申请日：20020917

公开号：US200301380A1公开日：20030724

专利附图：

摘要：A -ary QAM (Quadrature Amplitude Modulation) demodulation apparatusand method for receiving an input signal R(X,Y) comprised of a kquadrature-phase signal

Yand a kin-phase signal X, and generating soft decision values &Lgr;(s), &Lgr;(s), &Lgr;(s),&Lgr;(s), &Lgr;(s) and &Lgr;(s) for the input signal R(X, Y) are disclosed. A first softdecision value generator receives the quadrature-phase signal Yof the received signalRand a distance value 2a between six demodulated symbols on the same axis, andgenerates soft decision values &Lgr;(s), &Lgr;(s) and &Lgr;(s) for sixth, fifth, and fourthdemodulated symbols. A second soft decision value generator receives the in-phasesignal Xof the received signal Rand the distance value 2a between the six demodulatedsymbols on the same axis, and generates soft decision values &Lgr;(s), &Lgr;(s) and &Lgr;(s) for third, second and first demodulated symbol.

申请人：HA SANG-HYUCK,KIM MIN-GOO

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