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:
Feb. 01, 2000
Filed:
Dec. 18, 1997
Sumio Nakagawa, Tokyo, JP;
Ikegami Tsushinki Co., Ltd., Tokyo, JP;
Abstract
A circuit for measuring a carrier-to-noise ratio or a bit error rate of demodulated I and Q digital signals obtained by demodulating an input carrier wave which is modulated and transmitted under a carrier modulation transmission system including a discriminating circuit for producing a discrimination signal each time the demodulated digital signal comes within predetermined windows set on a signal space of the I and Q signals, a counter for counting the discrimination signals during a predetermined time interval, and a calculating circuit for calculating a carrier-to-noise ratio or bit error rate in accordance with a count value with reference to a previously stored relationship between count values and carrier-to-noise ratios or bit error rates.