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. 10, 2011
Filed:
Dec. 07, 2007
Håkan Grenabo, Stenkullen, SE;
Håkan Grenabo, Stenkullen, SE;
Advantech Advanced Microwave Technologies, Inc., Saint-Laurent, Quebec, CA;
Abstract
The present invention relates to a method for reducing cycle slips in a carrier recovery loop for a phase detector, the method comprising the steps of receiving an input signal consisting of samples, each received sample having an in-phase (I) and quadrature-phase (Q) component, providing the input signal to a phase error estimator adapted to determine a phase error estimate, providing the phase error estimate to a loop filter, and forming an output signal from the carrier recovery loop by subtracting an output from the loop filter from the input signal, wherein the phase error estimate is determined based on a combination of the amplitude and phase of the samples and a probability measure for a specifically transmitted symbol, thereby improving phase tracking performance of the carrier recovery loop. Advantages with the present invention includes reduction of cycle slips without using a high performance, and expensive, hardware solution, at the same time as it is possible to suppress the effects of decision errors which enables higher gain, thereby giving an improvement in Bit Error Rate (BER) in low SNR conditions. The present invention also relates to a corresponding phase detector.