Russell C Mckown

US Patent:

6371923, Apr 16, 2002

Filed:

Dec 7, 1999

Appl. No.:

09/456049

Inventors:

Luchy D. Roteliuk - Lake Forest CA
Russell McKown - Richardson TX

Assignee:

Edwards Lifesciences Corporation - Irvine CA

International Classification:

A61B 5026

US Classification:

600526

Abstract:

The invention estimates a cardiac performance value such as cardiac output (CO) and cardiac ejection fraction (EF) by sensing a downstream indicator concentration signal y(t) that corresponds to an indicator (preferably heat) signal x(t) injected upstream in a patients blood channel. The signal x(t) is preferably generated as a series of alternating transitions between a high state and a low state, such as a PRBS signal. The signal y(t) is then divided into at least one sub-signal that is synchronous with x(t). A decay parameter that minimizes a cost function that includes a time-domain channel relaxation model is then calculated. The cardiac performance value is then calculated based on this value for. For each transition of the injected indicator signal, a corresponding segment of the indicator concentration signal is preferably isolated, and a segment relaxation parameter is then calculated. The decay parameter is then estimated as a predetermined function of the segment relaxation parameters.

US Patent:

6891810, May 10, 2005

Filed:

Apr 20, 2001

Appl. No.:

09/839456

Inventors:

Paul F. Struhsaker - Plano TX, US
Robert R. Nelson - Dallas TX, US
Russell C. McKown - Richardson TX, US

Assignee:

Raze Technologies, Inc. - Plano TX

International Classification:

H04L005/14
H04L007/00
H04J003/00

US Classification:

370294, 370333, 370336, 375261, 375279, 714758

Abstract:

There is disclosed a radio frequency (RF) modem shelf for use in a fixed wireless access network comprising a plurality of base stations capable of bidirectional time division duplex (TDD) communication with wireless access devices disposed at a plurality of subscriber premises. The radio frequency (RF) modem shelf comprises: 1) a first RF modem capable of communicating with a plurality of the wireless access devices using TDD frames, each TDD frame having an uplink for receiving data and a downlink for transmitting data; and 2) a modulation controller associated with the RF modem shelf capable of determining an optimum modulation configuration for each of the plurality of wireless access devices communicating with the first RF modem, wherein the modulation controller causes the first RF modem to transmit first downlink data to a first wireless access device in a first data block having a first optimum modulation configuration and to transmit second downlink data to the first wireless access device in a second data block having a different second optimum modulation configuration.

US Patent:

6947477, Sep 20, 2005

Filed:

Apr 20, 2001

Appl. No.:

09/839719

Inventors:

Paul F. Struhsaker - Plano TX, US
Russell C. McKown - Richardson TX, US

Assignee:

Raze Technologies, Inc. - Plano TX

International Classification:

H04B001/38
H04L005/16

US Classification:

375222, 375224

Abstract:

Apparatus, and an associated method, for creating a profile associated with burst data signals communicated to a base station of a fixed wireless access communication system. The profile is created to facilitate receive operations performed upon subsequent bursts of the burst data signal. The profile is stored at a storage device and retrieved when subsequent bursts of the bursts data signal are received at the base station.

US Patent:

7002929, Feb 21, 2006

Filed:

Apr 20, 2001

Appl. No.:

09/839457

Inventors:

Paul F. Struhsaker - Plano TX, US
Robert R. Nelson - Dallas TX, US
Russell C. McKown - Richardson TX, US

Assignee:

Raze Technologies, Inc. - Plano TX

International Classification:

H04J 3/16

US Classification:

370280, 370294

Abstract:

There is disclosed a TDD frame transmission synchronization apparatus for use in a fixed wireless access network comprising a plurality of base stations capable of bidirectional time division duplex (TDD) communication with wireless access devices disposed at a plurality of subscriber premises. The TDD frame transmission synchronization apparatus comprises a frame allocation controller for receiving from a first radio frequency (RF) modem shelf associated with a first base station access requests generated by a first group of wireless access devices communicating with the first base station and determining from traffic requirements associated with the access requests a time duration of a longest downlink portion of TDD frames used by a first one of a plurality of RF modems in the RF modem shelf to communicate with a first wireless access device. The frame allocation controller further determines a frame allocation of the downlink portion and the uplink portion of TDD frames used by the plurality of RF modems to communicate with the first group of wireless access devices.

US Patent:

7075967, Jul 11, 2006

Filed:

Apr 20, 2001

Appl. No.:

09/838810

Inventors:

Paul F. Struhsaker - Plano TX, US
Russell C. McKown - Richardson TX, US

Assignee:

Raze Technologies, Inc. - Plano TX

International Classification:

H04B 1/69
H04B 1/707
H04B 1/713

US Classification:

375130, 375260, 375343

Abstract:

There is disclosed a transceiver for use in a base station of a fixed wireless network that communicates with a plurality of subscriber transceivers via time division duplex (TDD) channels. The transceiver comprises: 1) a receiver front-end for receiving data burst transmissions from the plurality of subscriber transceivers in an uplink portion of a TDD channel, wherein the receiver front-end demodulates the received data burst transmissions into a digital baseband signal in-phase (I) signal and a digital baseband quadrature (Q) signal; 2) a first frequency domain feedforward equalization filter for receiving the I signal; 3) a second frequency domain feedforward equalization filter for receiving the Q signal; 4) an adder for producing a combined symbol estimate sequence; 5) a slicer for receiving and quantizing the combined symbol estimate sequence; and 6) a time domain feedback filter for generating a symbol correction sequence.

US Patent:

7099383, Aug 29, 2006

Filed:

Apr 20, 2001

Appl. No.:

09/839726

Inventors:

Paul F. Struhsaker - Plano TX, US
Russell C. McKown - Richardson TX, US

Assignee:

Raze Technologies, Inc. - Plano TX

International Classification:

H04B 1/38
H04L 5/16

US Classification:

375222, 375219, 710 1, 379 9001, 455 21, 455293, 455312, 455337

Abstract:

Apparatus, and an associated method, for acting upon data signals received at a base station of a fixed wireless access communication system. A plurality of modems are positioned at the base station, and a controller controls to which modem that a data signal, transmitted by a particular subscriber station, is applied to a particular modem. Profiles relating to channel and signal characteristics are also maintained and used by the modem during demodulation operations.

US Patent:

7173916, Feb 6, 2007

Filed:

Apr 20, 2001

Appl. No.:

09/839458

Inventors:

Paul F. Struhsaker - Plano TX, US
Robert R. Nelson - Dallas TX, US
Russell C. McKown - Richardson TX, US

Assignee:

Raze Technologies, Inc. - Plano TX

International Classification:

H04Q 7/00

US Classification:

370329, 370341

Abstract:

There is disclosed a radio frequency (RF) modem shelf for use in a fixed wireless access network comprising a plurality of base stations capable of bidirectional time division duplex (TDD) communication with wireless access devices disposed at a plurality of subscriber premises. The radio frequency (RF) modem shelf comprises: a) a first RF modem for communicating with a plurality of the wireless access devices using TDD frames, each TDD frame having an uplink for receiving data and a downlink for transmitting data; and b) a modulation controller associated with the RF modem shelf for determining an optimum modulation configuration for each of the plurality of wireless access devices communicating with the first RF modem. The modulation controller causes the first RF modem to transmit downlink data to a first wireless access device in a first data block having a first optimum modulation configuration and to transmit downlink data to a second wireless access device in a second data block having a different second optimum modulation configuration.

US Patent:

7220230, May 22, 2007

Filed:

Dec 5, 2003

Appl. No.:

10/728705

Inventors:

Luchy Roteliuk - Lake Forest CA, US
Russell McKown - Richardson TX, US
Doug Meyer, Jr. - Tustin CA, US

Assignee:

Edwards Lifesciences Corporation - Irvine CA

International Classification:

A61B 5/02

US Classification:

600485

Abstract:

Cardiac stroke volume (SV) of a subject is estimated as a function of a value derived from a measured arterial pressure waveform. The value may be the standard deviation, or a function of the difference between maximum and minimum pressure values, or a function of either the maximum value of the first time derivative or the absolute value of the minimum of the first time derivative of the pressure waveform, or both, or a function of the magnitude of one or more spectral components of the pressure waveform at a frequency corresponding to the heart rate. Cardiac output is then estimated as the product of the subject's heart rate and SV, scaled by a calibration constant. Arterial pressure may be measured invasively or non-invasively.