Jeffrey D Heath

US Patent:

8169993, May 1, 2012

Filed:

Apr 16, 2008

Appl. No.:

12/104269

Inventors:

Kee-dyi Huang - Cupertino CA, US
Maximilian Maung - Daly City CA, US
Bernard Justus Olshausen - Sammamish WA, US
Jeffrey Abramson Heath - Jericho NY, US
Derek Truesdale - San Jose CA, US

Assignee:

Anritsu Company - Morgan Hill CA

International Classification:

H04J 1/00

US Classification:

370343

Abstract:

The quality of the signal from a base station is measured and adjusted for distortion due to multipath and due to signals from neighboring co-channel base stations. The signal quality is measured conventionally by determining Rho or EVM and then Rho or EVM are adjusted. To adjust the signal the process includes the steps of: (a) sampling a received CDMA base station signal in a particular frequency channel, calculating the total received power to provide a reference value for subsequent normalization; (b) demodulating the received signal and constructing an ideal reference signal; (c) correlating between the ideal reference signal and received signal to determine a Rho value, or calculating the ratio of the difference between ideal and received signal to the ideal signal to obtain EVM; (d) performing a self cross correlation to separate signals from the sampled received signal on different delay paths, and determining a multipath power value x as a total power of signals on non-dominant ones of the delay paths; (e) performing a code correlation pilot scan of the sampled signal to determine strengths of signals from neighboring co-channel base stations; (f) summing the power levels of the neighboring co-channel base station signals to provide a total pilot pollution power y; and (g) calculating an adjusted Rho or EVM by removing x and y from the total received power.

US Patent:

20130113275, May 9, 2013

Filed:

Oct 22, 2012

Appl. No.:

13/657412

Inventors:

LINEAR TECHNOLOGY CORPORATION - Milpitas CA, US
Jeffrey Lynn HEATH - Santa Barbara CA, US

Assignee:

LINEAR TECHNOLOGY CORPORATION - Milpitas CA

International Classification:

H02J 4/00

US Classification:

307 1

Abstract:

Technique for providing power to a powered device (PD) over a cable having first and second sets of twisted pairs, such as signal pairs and spare pairs. Power Sourcing Equipment (PSE) circuitry is coupled via a first switch to the second set, e.g. to the spare pairs. A switch control circuit turns the first switch off to enable the PSE circuitry to perform a prescribed operation in connection with the PD over only the first set, e.g. over the signal pairs, and turns the first switch on to enable the PSE circuitry to perform the prescribed operation in connection with the PD over the first and second sets.