Robert B Heath

US Patent:

6850498, Feb 1, 2005

Filed:

Dec 22, 2000

Appl. No.:

09/745767

Inventors:

Robert W. Heath - Mountain View CA, US
Jose Tellado - Stanford CA, US

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H04Q 700

US Classification:

370328, 370329, 370332, 375225

Abstract:

A wireless link between a first transmitter and a first receiver in a multiple access communications system is evaluated by receiving, at the first transmitter, information that is intended for a second receiver and that is transmitted in a second transmission mode that is different from the current transmission mode and obtaining an error measure for the information that is received at the first receiver and intended for the second receiver. The obtained error measure is then used to determine if the second transmission mode is an acceptable transmission mode. In an embodiment, if the second transmission mode is determined to be acceptable, then the current transmission mode of the first receiver can be replaced by the second transmission mode. In an embodiment, the current transmission mode is replaced by the second transmission mode only if the second transmission mode is a “higher” transmission mode than the current transmission.

US Patent:

7328033, Feb 5, 2008

Filed:

Oct 1, 2004

Appl. No.:

10/956499

Inventors:

Theodore S. Rappaport - Austin TX, US
Robert W. Heath - Austin TX, US

International Classification:

H04L 1/00

US Classification:

455500, 455561, 455515, 4555542

Abstract:

Embodiments of the present invention provide a flexible system for providing wireless broadband access. The system can include a gateway that has a plurality of gateway premises equipment (“GPE”) units and a network fuser connected to the plurality of GPE units to coordinate the activities of the plurality of the GPE units. The network fuser can provide DSP configuration information and RF configuration information to the GPE units. The network fuser is also operable to connect to a high-speed network (e. g. , a backhaul network) and to provision data from the high-speed network to each of the plurality of GPE units. The system can also include a plurality of customer premises equipment (“CPE”) units remote from the gateway.

US Patent:

7392054, Jun 24, 2008

Filed:

May 31, 2005

Appl. No.:

11/141496

Inventors:

Sung-Hyun Cho - Seoul, KR
Robert W. Heath - Austin TX, US
Sang-Boh Yun - Seongnam-si, KR
Won-Hyoung Park - Seoul, KR
Manish Airy - Austin TX, US

Assignee:

Samsung Electronics Co., Ltd.
Board of Regents, The University of Texas System - Austin TX

International Classification:

H04Q 7/20

US Classification:

455447, 455450, 370328

Abstract:

A resource allocation scheduling method for a cellular communication system that can avoid interference between cells. The method includes dividing a frequency band of a system into frames each having preferential allocation blocks and general allocation blocks on a time axis, classifying terminals in each cell into groups of terminals vulnerable to interference and terminals non-vulnerable to interference, and allocating resources by terminal groups according to priority orders given to the terminal groups. The preferential allocation resources designed to have the orthogonality to the interference cells, i. e. , sectors, on the time axis are allocated to the terminals vulnerable to the interference, and the remaining resources are allocated to the terminals non-vulnerable to the interference.

US Patent:

7486931, Feb 3, 2009

Filed:

Apr 14, 2005

Appl. No.:

11/105984

Inventors:

Sung-Hyun Cho - Seoul, KR
Robert W. Heath - Austin TX, US

Assignee:

Samsung Electronics Co., Ltd.
Board of Regents, The University of Texas System - Austin TX

International Classification:

H04B 1/02
H04B 7/02
H04M 1/00

US Classification:

455 39, 455 6711, 455101, 4552772, 4555621

Abstract:

A cellular mobile communication system using multiple antennas reselects a plurality of transmission antennas of base stations connected to a mobile station. The system includes measuring a channel quality parameter used for estimation of channel performance, determining whether to reselect the transmission antennas using the measured channel quality parameter, reselecting transmission antennas of the base stations connected to the mobile station, and connecting the reselected transmission antennas to the base station.

US Patent:

7649868, Jan 19, 2010

Filed:

Dec 30, 2004

Appl. No.:

11/027031

Inventors:

Robert W. Heath - Mountain View CA, US
Jose Tellado - Stanford CA, US

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H04W 4/00

US Classification:

370332, 370341, 370389, 370432, 455 62, 455 6711, 455 69

Abstract:

A wireless link between a first transmitter and a first receiver in a multiple access communications system is evaluated by receiving, at the first transmitter, information that is intended for a second receiver and that is transmitted in a second transmission mode that is different from the current transmission mode and obtaining an error measure for the information that is received at the first receiver and intended for the second receiver. The obtained error measure is then used to determine if the second transmission mode is an acceptable transmission mode. In an embodiment, if the second transmission mode is determined to be acceptable, then the current transmission mode of the first receiver can be replaced by the second transmission mode. In an embodiment, the current transmission mode is replaced by the second transmission mode only if the second transmission mode is a “higher” transmission mode than the current transmission.

US Patent:

7693100, Apr 6, 2010

Filed:

Apr 20, 2006

Appl. No.:

11/407748

Inventors:

Sung-Hyun Cho - Suwon-si, KR
Sang-Boh Yun - Seongnam-si, KR
Taiwen Tang - Austin TX, US
Robert W. Heath - Austin TX, US

Assignee:

Samsung Electronics Co., Ltd.
Board of Regents, The University of Texas System - Austin TX

International Classification:

H04W 4/00
H04J 3/00
H04J 3/16

US Classification:

370328, 370329, 370341, 370345, 370346

Abstract:

In an adaptive feedback method for a cellular communication system having plural terminals feeding back channel information to an access point, the system selects one of an opportunistic mode and a polling mode as a feedback mode between an access point and the terminals on the basis of system and traffic parameters, sets up the access point and the terminals for the selected feedback mode, and feeds back the channel information from the terminals to the access point in the selected feedback mode. The adaptive feedback method changes the feedback mechanism adaptively to the system and traffic environment, making it possible to increase the system throughput as well as to decrease the MAC overhead regardless of the variation of the number of MSs.

US Patent:

7778147, Aug 17, 2010

Filed:

Sep 7, 2005

Appl. No.:

11/221223

Inventors:

Antonio Forenza - Austin TX, US
Robert W. Heath - Austin TX, US
Hyoung-Woon Park - Seongnam-si, KR
Ho Yang - Yongin-si, KR
Ho-Jin Kim - Seoul, KR
Marios Kountouris - Nice, FR
Pandharipande Ashish - Suwon-si, KR

Assignee:

Samsung Electronics Co., Ltd. - Suwon-si
Board of Regents, The University of Texas System - Austin TX

International Classification:

H04J 9/00

US Classification:

370204, 370478

Abstract:

A multiple-input multiple-output (MIMO) wireless communication system. A transmitter that includes a plurality of transmit antennas selects one of a spatial multiplexing scheme and a spatial diversity scheme, processes a signal in the selected transmission scheme, and transmits the signal through the plurality of transmit antennas. A receiver that includes a plurality of receive antennas processes a signal in a reception scheme mapped to a transmission scheme of the transmitter. The transmission schemes include a transmission scheme for maximizing diversity gain and a transmission scheme for maximizing spectral efficiency. The MIMO communication system using an adaptive transmission mode switching technique performs switching between MIMO transmission modes using spatial selectivity of a channel, thereby obtaining maximum gain in a signal to noise ratio (SNR) and spectral efficiency according to channel state.

US Patent:

7809330, Oct 5, 2010

Filed:

Apr 18, 2008

Appl. No.:

12/105880

Inventors:

Sung-Hyun Cho - Seoul, KR
Robert W. Heath - Austin TX, US

Assignee:

Samsung Electronics Co., Ltd.
Board of Regents, The University of Texas System - Austin TX

International Classification:

H04B 17/00
H04B 1/00
H04B 7/00
H04B 7/02
H04M 1/00

US Classification:

455 39, 455 6711, 455 69, 455101, 4552771, 4555621

Abstract:

A cellular mobile communication system using multiple antennas reselects a plurality of transmission antennas of base stations connected to a mobile station. The system includes measuring a channel quality parameter used for estimation of channel performance, determining whether to reselect the transmission antennas using the measured channel quality parameter, reselecting transmission antennas of the base stations connected to the mobile station, and connecting the reselected transmission antennas to the base station.