Apparatus and method for calculating soft decision value...

H - Electricity – 04 – L

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H04L 27/34 (2006.01) H04L 27/38 (2006.01)

Patent

CA 2429453

A 64-ary QAM (Quadrature Amplitude Modulation) demodulation apparatus and method for receiving an input signal Rk(Xk,Yk) comprised of a kth quadrature- phase signal Yk and a kth in-phase signal Xk, and generating soft decision values L(sk,5), L(sk,4), L(sk,3), L(sk,2), L(sk,1) and L(sk,0) for the input signal Rk(Xk, Yk) are disclosed. A first soft decision value generator receives the quadrature-phase signal Yk of the received signal Rk and a distance value 2a between six demodulated symbols on the same axis. A second soft decision value generator receives the in-phase signal Xk of the received signal Rk and the distance value 2a between the six demodulated symbols on the same axis.

La présente invention concerne un appareil de démodulation 64-ary MAQ (modulation d'amplitude en quadrature) et un procédé permettant de recevoir un signal d'entrée R¿k?(X¿k?,Y¿k?) constitué d'un k?ème¿ signal à modulation de phase en quadrature Y¿k? et d'un K?ème¿ signal en phase de symbole X¿k?, et de générer des amplitudes de décision souple .LAMBDA.(s¿k,5?), .LAMBDA.(s¿k,4?), .LAMBDA.(s¿k,3?), .LAMBDA.(s¿k,2?), .LAMBDA.(s¿k,1?) et .LAMBDA.(s¿k,0?) pour le signal d'entrée R¿k?(X¿k?, Y¿k?). Un premier générateur d'amplitude de décision souple reçoit le signal à modulation de phase en quadrature Y¿k? du signal reçu R¿k? et une valeur de distance 2a entre six symboles démodulés sur le même axe. Un second générateur d'amplitude de décision souple reçoit le signal en phase X¿k? du signal reçu R¿k? et la valeur de distance 2a entre les six symboles démodulés sur le même axe.

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