Method and apparatus for normalizing input metric to a...

Pulse or digital communications – Receivers – Particular pulse demodulator or detector

Reexamination Certificate

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C375S262000, C714S780000, C714S795000

Reexamination Certificate

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07860194

ABSTRACT:
An apparatus and method are provided for normalizing input soft metric to a channel decoder in a wireless communication system. A demapper generates soft metric using an in-phase component (Xk) and a quadrature component (Yk) of a received modulated symbol (Rk), a channel fading coefficient (gk) and a constant value (c) defined by a modulation order of the received modulated symbol. A normalizer receives the soft metric, computes a normalized log likelihood ratio (LLR) by multiplying the soft metric by a ratio of the constant value to a noise variance value, transforms the normalized LLR into a desired range and a desired number of bits, and outputs an input LLR of the channel decoder.

REFERENCES:
patent: 6697443 (2004-02-01), Kim et al.
patent: 6871316 (2005-03-01), Wong et al.
patent: 6980602 (2005-12-01), Kleinerman et al.
patent: 2002/0122510 (2002-09-01), Yakhnich et al.
patent: 2005/0069057 (2005-03-01), Krupka
patent: 2007/0127605 (2007-06-01), Sindhushayana
patent: 1999-0079402 (1999-11-01), None
patent: WO 03/043201 (2003-05-01), None

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