| 摘要 |
A 64-ary QAM (Quadrature Amplitude Modulation) demodulation apparatus and method for receiving an input signal R k (X k ,Y k ) comprised of a k th quadrature-phase signal Y k and a k th in-phase signal X k , and generating soft decision values A(s k,5 ), A(s k,4 ), A(s k,3 ), A(s k,2 ), A(s k,1 ) and A(s k,0 ) for the input signal R k (X k , Y k ) are disclosed. A first soft decision value generator receives the quadrature-phase signal Y k of the received signal R k and a distance value 2a between six demodulated symbols on the same axis, and generates soft decision values A(s k,5 ), A(s k,4 ) and A(s k,3 ) for sixth, fifth and fourth demodulated symbols. A second soft decision value generator receives the in-phase signal X k of the received signal R k and the distance value 2a between the six demodulated symbols on the same axis, and generates soft decision values A(s k,2 ), A(s k,1 ) and A(s k,0 ) for third, second and first demodulated symbols. |
