Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1993-11-16
1995-11-07
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
371 404, 371 43, H04L 2706
Patent
active
054652758
ABSTRACT:
In accordance with the present invention, a technique for efficiently utilizing memory in determining which next state accumulated cost to retain, such as in a communication system or a Viterbi decoder. The system includes a memory having a portion of registers allocated to a first array and a portion of registers allocated to a second array. The technique includes retrieving a present state accumulated cost from a storage register of the first array and calculating a next state accumulated cost based on the present state accumulated cost. The next state accumulated cost is stored in a storage register of the second array. The second array is designated as containing present state accumulated costs. A present state accumulated cost is retrieved from a storage register of the second array and used in calculating a subsequent next state accumulated cost. The subsequent next state accumulated cost is stored in a storage register of the first array.
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patent: 4748626 (1988-05-01), Wong
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Blaker David M.
Diamondstein Marc S.
Ellard Gregory S.
Mobin Mohammad S.
Sam Homayoon
AT&T IPM Corp.
Chin Stephen
Smith David L.
Vo Don N.
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