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:
Aug. 23, 2016
Filed:
Sep. 25, 2015
Topcon Positioning Systems, Inc., Livermore, CA (US);
Nikolay Afanasievich Vazhenin, Moscow, RU;
Andrey Vladimirovich Veitsel, Moscow, RU;
Fedor Borisovich Serkin, Moscow, RU;
Vladimir Victorovich Veitsel, Moscow, RU;
Topcon Positioning Systems, Inc., Livermore, CA (US);
Abstract
A method of estimating current SNR in a sequence of symbols, including receiving a signal representing an additive mixture y(t)=s(t)+n(t) of a sequence of phase-modulated symbols with fixed length and phase modulation s(t) and including white Gaussian noise (AWGN) n(t); separating quadrature components Iand Qof the received signal in a quadrature mixer; determining a mean-squareof I; determining a mean-squareof Q; determining a square/squared value of mean absolute value (modulus); determining a square of mean value for quadrature component, where values of the quadrature component Qare averaged taking into account a sign of a symbol received in a channel; determining a current absolute value (vector length) for; determining the current SNR based on,, ||,and √{square root over (I+Q)}; and compensating for a systematic error of the current SNR.