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:
May. 04, 2004
Filed:
Apr. 30, 2001
Abstract
A structure and a method for depuncturing an input bit stream being input to a Viterbi decoder when the Viterbi decoder is designed by using a Radix-4 branch metric calculator in a method for designing the Viterbi decoder that decodes a punctured code at a high-speed, are disclosed. A depuncture structure for Radix-4 branch metric calculation in a high-speed Viterbi decoder includes four FIFOs, four multiplexers, and one Radix-4 branch metric calculator. Two input bit streams of I and Q are connected to two upper FIFOs and two lower FIFOs. An output terminal of FIFO is connected to upper and lower multiplexers of the next stage. One output terminal of each multiplexer is connected to Radix-4 branch metric calculator. As a result, Radix-4 branch metric calculation can be achieved by using the same clock as a clock speed of the input I and Q bit streams. This structure and this method can be applied to a depuncturing process for Radix-4 branch metric calculation of all punctured codes derived from ½ code.