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:
Jun. 29, 2004
Filed:
May. 05, 2000
Thomas W. Goeddel, Fair Haven, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
The performance of wireless devices is improved using methods and devices which comprise novel SPEED and NOISE metrics. The SPEED metric is generated from a mean value of a differential signal while the NOISE metric is generated from a variance value of a differential signal. The generation of both metrics assumes the use of a limited number of symbols used to generate the mean and variance values. One example of a signal used to generate the metrics comprises the 14 synchronization symbols which make up part of an IS-136 standard signal. The SPEED metric was discovered to comprise a value which is equal to the magnitude of the mean value of the differential signal while the NOISE metric was discovered to comprise a value which is approximately equal to twice the variance of noise in a received baseband signal, while at the same time being independent of the speed at which an object, such as a wireless device, moves. In the case where a Least Mean Square (“LMS”) method is used to estimate channel fading in a flat-faded channel, it was discovered that the logarithm of a ratio of the SPEED metric to the NOISE metric as plotted against optimum step sizes is a substantially linear relationship.