Eric K Jacobsen

US Patent:

6975583, Dec 13, 2005

Filed:

May 14, 2001

Appl. No.:

09/855132

Inventors:

Eric A. Jacobsen - Scottsdale AZ, US

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H04J011/00

US Classification:

370206, 370210

Abstract:

A technique includes basing a discrete frequency transformation on the number of subcarriers in a predetermined set of subcarriers. One or more subcarriers of the set are assigned to modulate data, and the remaining subcarriers of the set are not assigned to modulate the data. The discrete frequency transformation is performed on the data to modulate the data, and mathematical operations that are associated with the subcarriers not assigned to modulate the data are excluded from the transformation.

US Patent:

7142502, Nov 28, 2006

Filed:

Aug 30, 2001

Appl. No.:

09/943872

Inventors:

Eric A. Jacobsen - Scottsdale AZ, US

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H04J 11/00
H04J 3/06

US Classification:

370208, 370509

Abstract:

A technique includes receiving a signal that indicates a modulated symbol during a given time slice of the signal. Sliding window frequency transformations of the signal are performed, and each sliding window transformation is associated with a different time interval of the signal. One of the time intervals is selected to correspond to the time slice. The result of the frequency transformation associated with the selected time interval is used to obtain an indication of the demodulated symbol.

US Patent:

7197315, Mar 27, 2007

Filed:

Aug 8, 2003

Appl. No.:

10/637335

Inventors:

Adrian P. Stephens - Cambridge, GB
Eric A. Jacobsen - Scottsdale AZ, US

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H04M 7/20

US Classification:

455450, 455509, 455464

Abstract:

A method and apparatus to select a channel of operation for a wireless network device may examine channels supported by the device to gather information regarding present use of the channels. A best channel may be determined for the wireless network device by identifying a channel that maximizes a predetermined performance metric.

US Patent:

7213197, May 1, 2007

Filed:

Dec 30, 2003

Appl. No.:

10/749624

Inventors:

Eric A. Jacobsen - Scottsdale AZ, US
Valentine J. Rhodes - Scottsdale AZ, US

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

G06F 11/00

US Classification:

714800

Abstract:

An apparatus may include an orthogonal frequency division multiplexing (OFDM) physical layer interface. An adaptive subcarrier demodulator or an adaptive subcarrier modulator may be coupled to the OFDM physical layer interface to implement adaptive bit loading (ABL). A decoder or an encoder may be coupled to the adaptive subcarrier demodulator or to the adaptive subcarrier modulator to implement low density parity checking.

US Patent:

7230911, Jun 12, 2007

Filed:

May 10, 2001

Appl. No.:

09/852376

Inventors:

Eric A. Jacobsen - Scottsdale AZ, US

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H04J 11/00

US Classification:

370208, 370328, 375346

Abstract:

A computationally efficient channel estimation technique for use within an orthogonal frequency division multiplexing (OFDM) communication system determines coefficients of a channel transfer function by calculating the dot products of a pilot vector and a plurality of interpolation vectors. One dot product is preferably calculated for each subcarrier of interest within the system. The pilot vector is extracted from an OFDM symbol received from a communication channel. In a preferred approach, a number of interpolation vectors are precalculated and stored within a communication device for subsequent use during channel estimation and equalization operations. The technique is highly flexible and can be implemented using, for example, a variable user block size or a variable pilot vector size.

US Patent:

7245880, Jul 17, 2007

Filed:

Aug 31, 2000

Appl. No.:

09/652773

Inventors:

Eric A. Jacobsen - Scottsdale AZ, US

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H04B 1/00
H04B 7/00

US Classification:

455 69, 455 134, 455522, 455562, 4554522, 370318

Abstract:

A wireless transmitter system for use in maintaining a wireless link with a remote transceiver includes a beamforming transmit antenna structure and a power control unit for controlling transmit power levels. The system determines the direction of the remote transceiver and then generates a transmit antenna beam in that direction. The power control unit then determines the antenna gain of the generated beam and uses the antenna gain information to adjust the transmit power level of the system so that it does not exceed government mandated limits. In one embodiment, the average transmit duty cycle of the system is also used to adjust transmit power. The system is capable of achieving a maximum transmit power without exceeding applicable power limits.

US Patent:

7260361, Aug 21, 2007

Filed:

Dec 29, 2003

Appl. No.:

10/748867

Inventors:

Eric A. Jacobsen - Scottsdale AZ, US

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H04B 1/00
H04B 15/00

US Classification:

455 631, 455 42, 455 6711, 4551142, 370210, 370332, 370298, 375261, 375268, 375271

Abstract:

A method, apparatus and system relate to detecting an interfering device in a wireless network such as a wireless local area network (WLAN). In wireless networks using orthogonal frequency division multiplexing (OFDM) and adaptive bit loading (ABL), adaptive modulation information should be somewhat symmetric in uplink and downlink directions. By comparing modulation adaptations in the uplink and downlink directions of a communication channel between at least two terminals, identified differences can indicate the presence of a potential interferer in the wireless network. A location of the potential interferer can be estimated if a location of one or more network terminals experiencing interference is known or can be determined. An exemplary implementation for a device of the invention may be as an Access Point (AP) in the WLAN.

US Patent:

7280804, Oct 9, 2007

Filed:

Jan 30, 2004

Appl. No.:

10/769414

Inventors:

Eric A. Jacobsen - Scottsdale AZ, US
Shahrnaz Azizi - San Diego CA, US

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H04B 17/00

US Classification:

455 6711, 4554522, 370235

Abstract:

Systems, devices and methods for updating link adaptations in multi-carrier modulated signals between an access point (AP) and a wireless local area network (WLAN) station (STA) include (are configured for) periodically transmitting a channel sounding signal from the AP. The STA receives each unsolicited channel sounding signal and evaluates the current channel conditions between the AP and STA. The AP adjusts a rate of transmission of the channel sounding signals in accordance with the channel coherence time so that the channel estimates performed by the STA will be valid within the time varying characteristics of the channel. Depending on the length of the coherence time for network environment, the channel sounding signals may be AP beacons, low overhead signal fragments with no payload, or a combination of both.