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:
Mar. 04, 1997
Filed:
Feb. 21, 1995
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A signal vector sequence corresponding to one block which is inputted in continuous n symbol sections is held in a vector sequence holding portion 11. A virtual information generating portion 12 and a coding portion 13 successively generate, with respect to N paths which can exist in the one block, corresponding virtual code vector sequences. A metric calculating portion 14 receives the signal vector sequence held in the vector sequence holding portion 11 and each of the virtual code vector sequences applied from the coding portion 13 to calculate respective metrics of the N paths. A metric comparing portion 16 and a metric holding portion 15 judge a maximum likelihood path having the minimum metric on the basis of the respective metrics calculated by the metric operating portion 14. When processing of the N paths is terminated, an information holding portion 17 acquires from the virtual information generating portion 12 as it existed before the coding on the virtual code vector sequence corresponding to the maximum likelihood path and outputs the information as the result of the decoding. In calculating the respective metrics of the N paths which can exist in one block, the metric calculating portion 14 finds a metric value in a state where the terms of the square of the magnitude of a signal vector are previously subtracted from each of calculation expressions. Consequently, the calculation processing is simplified, and the circuit arrangement is simplified.