Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2005-05-31
2005-05-31
Corrielus, Jean B. (Department: 2637)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S291000, C714S792000, C714S795000, C714S796000
Reexamination Certificate
active
06901119
ABSTRACT:
A method and apparatus are provided for implementing soft-input soft-output iterative detectors/decoders. Soft-input information is added directly to incoming channel samples. Input signals comprising the received incoming channel samples with the added soft-input information are detected using a detector trellis. Branch metric terms are transformed to shift all time varying terms with the added soft-input information and some constant terms after an add compare select (ACS) unit. The shifted time varying terms with the added soft-input information and the shifted constant terms are added directly to state metric terms. The soft-input information is added directly to incoming channel samples and the computation of branch metrics is not affected. This allows optimization of a dual-max detector and soft-input soft-output Viterbi detector architectures to minimize hardware complexity and power consumption.
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Cideciyan Roy Daron
Coker Jonathan Darrel
Dholakia Ajay
Eleftheriou Evangelos S.
Galbraith Richard Leo
Corrielus Jean B.
Pennington Joan
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