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:
Apr. 20, 2004
Filed:
Feb. 22, 2002
Albert L. Garrett, Melbourne, FL (US);
Keith R. Baldwin, Melbourne Beach, FL (US);
Other;
Abstract
A threshold detector for detecting synchronization signals at correlator output during packet acquisition. An RF receiver converts RF signals into baseband signals. A matched filter correlator correlates samples of the baseband signals with predetermined synchronization signals, such as long sync symbols, and provides corresponding correlation samples. A long-term integrator integrates a first predetermined number of the correlation samples to provide a long term moving average and a short term integrator integrates a second predetermined number of the correlation samples to provide a short term moving average signal. The short term moving average signal is based on channel delay spread and the long term moving average tracks channel noise. A multiplier multiplies the long term moving average signal by a scale factor to generate a dynamic threshold. A detector detects a crossover between the short term moving average and the dynamic threshold to estimate timing of received synchronization signals.