Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2005-06-14
2005-06-14
Ha, Dac V. (Department: 2634)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C714S794000
Reexamination Certificate
active
06907084
ABSTRACT:
A method and apparatus for processing modulation symbols for soft input decoders using an efficient method of calculating an accurate log-likelihood ratio without relying on approximations is described. In contrast to other techniques that calculate distance metrics based on the individual constellation points, the method of the invention analyzes distances based on different groupings of points, where a given group (e.g., one of the II+kor II−ksets) is defined by the same bit (1or0) in the same bit position. A recursive scheme is preferably used where previous computations are saved and used for subsequent computations or iterations and the decoupled processing of real and imaginary components associated with the I and Q components.
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Brady III Wade James
Neerings Ronald O.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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