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. 09, 1999
Filed:
Mar. 19, 1997
Moe Rahnema, Gaithersburg, MD (US);
Hughes Electronics Corporation, El Segundo, CA (US);
Abstract
A data symbol timing recovery technique for determining an optimum symbol timing phase for use in digital communication systems using a burst mode digital communication format. The technique uses a nonlinear operation, e.g., squaring the magnitude of a down-converted baseband demodulated data burst. The squared signal is processed through a simple one pole IIR digital filter which extracts the symbol timing phase offset. The phase offset is scaled to the time domain and used to adjust the symbol timing of the next data burst. This technique is applicable to phase modulated data such as BPSK or QPSK modulated data. The technique was simulated using .pi./4 QPSK modulated data and provided improved and robust performance.