Apparatus and method for calculating soft decision value...

Details Apparatus and method for calculating soft decision value... Apparatus and method for calculating soft decision value...

2006-05-09

2006-05-09

Ghebretinsae, Temesghen (Department: 2637)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S262000, C375S342000, C329S304000

Reexamination Certificate

active

07042954

ABSTRACT:
A 64-ary QAM (Quadrature Amplitude Modulation) demodulation apparatus and method for receiving an input signal Rk(Xk,Yk) comprised of a kthquadrature-phase signal Ykand a kthin-phase signal Xk, and generating soft decision values Λ(sk,5), Λ(sk,4), Λ(sk,3), Λ(sk,2), Λ(sk,1) and Λ(sk,0) for the input signal Rk(Xk, Yk) are disclosed. A first soft decision value generator receives the quadrature-phase signal Ykof the received signal Rkand a distance value 2a between six demodulated symbols on the same axis, and generates soft decision values Λ(sk,5), Λ(sk,4) and Λ(sk,3) for sixth, fifth, and fourth demodulated symbols. A second soft decision value generator receives the in-phase signal Xkof the received signal Rkand the distance value 2a between the six demodulated symbols on the same axis, and generates soft decision values Λ(sk,2), Λ(sk,1) and Λ(sk,0) for third, second and first demodulated symbol.

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