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US 5,844,947 AGranted
Viterbi decoder with reduced metric computation
AssigneeLucent Technologies Inc.
InventorRichard Adam Cesari
Life of this patent
Estimating the term…
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AssigneeLucent Technologies Inc.
InventorRichard Adam Cesari
Estimating the term…
There is disclosed a method and apparatus for computing branch metrics that are combinations of autocorrelation and cross correlation terms are constructed by first calculating and storing components of the autocorrelation and cross correlation terms at a symbol instant. Once calculated and stored, predetermined ones of the autocorrelation components and the cross correlation components are selected. The selected autocorrelation components and cross correlation components, or their inverse as predetermined, are combined to produce a branch metric. Other predetermined combinations of the stored components of autocorrelation and cross correlation terms, or their inverse, are combined to produce other branch metrics at the same symbol instant. All branch metrics associated with the symbol instant can be calculated in this manner. The components of the autocorrelation terms and cross correlation terms associated with the next symbol instant are calculated and stored, and the process of generating the branch metrics repeated.
A method for determining a plurality of branch metrics at a symbol instant that are comprised of autocorrelation terms and cross correlation terms, including the steps of generating components of the autocorrelation terms, storing the components of the autocorrelation terms, generating components of the cross correlation terms, storing the components of the cross correlation terms, characterized by:
An integrated circuit including a branch metric calculation circuit, comprising:
An integrated circuit comprising:
A receiver, comprising:
Dependencies are inferred from the claim text.