Jeffrey Abramson 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:

20190320444, Oct 17, 2019

Filed:

Apr 11, 2019

Appl. No.:

16/382020

Inventors:

- San Jose CA, US
Jeffrey Abramson Heath - Jericho NY, US

International Classification:

H04W 72/08
H04L 5/14
H04W 72/12
H04W 72/04

Abstract:

A method is disclosed for use in a frequency division duplex (FDD) wireless network including a base station (BS) and a user equipment controller (UE) communicating through a medium having an uplink communication channel supporting communications from the UE to the BS, and a downlink communication channel supporting communications from the BS to the UE. The method includes identifying an uplink frequency spectrum in the uplink communication channel affected by an interfering signal, and determining the uplink power level of the interfering signal and whether the interfering signal is caused by passive intermodulation distortion (PIM). In response to determining that that the interfering signal is caused by PIM, the method includes adjusting, based on the uplink frequency spectrum and the uplink power level of the interfering signal, one or more of a downlink power level of a downlink transmission signal and a downlink frequency range in the downlink communication channel.