Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1996-12-23
1998-12-01
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375262, 375209, 375210, H03D 100, H04L 2706
Patent
active
058449477
ABSTRACT:
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.
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Chin Stephen
Ghayour Muhammad
Lucent Technologies - Inc.
Smith David L.
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