The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 29, 2004
Filed:
Apr. 06, 2000
David W. Hansquine, San Diego, CA (US);
QUALCOMM, Incorporated, San Diego, CA (US);
Abstract
The present invention discloses a method and apparatus for efficiently reading and storing state metrics in memory to enhance high-speed ACS Viterbi decoder implementations. The method includes applying an addressing scheme that determines the address locations of source state metrics during a process cycle. The source state metrics are then read from the address locations during the process cycle and applied to an add-compare-select butterfly operation of a Viterbi algorithm implementation to generate target state metrics. The method then stores each of the target state metrics into the address locations previously occupied by the source state metrics. The method further provides an addressing scheme that determines the address locations of the source state metrics based on a process cycle counter that is incremented and rotated in accordance with the process cycle. The method also provides an addressing scheme that employs a predetermined function to determine the address locations of the source state metrics.