Method of QAM soft demapping

Details Method of QAM soft demapping Method of QAM soft demapping

2011-01-25

2011-01-25

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S262000, C375S340000, C375S341000, C714S759000, C714S760000, C714S794000, C714S795000

Reexamination Certificate

active

07876846

ABSTRACT:
A method of demapping in a receiver including deriving M intermediate soft bit values yjfor the I and Q data of the input signal as a function of the spacing in the constellation; and limiting the range of the M values yj. A look-up table index is derived for each of the limited M values yj. A look-up table, having 2N+1entries for supporting up to N soft bit outputs, is indexed using the derived indices; and K soft bits for each of the M values yjof the I and Q data are outputted.

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