Thomas S Richardson

US Patent:

6363121, Mar 26, 2002

Filed:

Dec 7, 1998

Appl. No.:

09/206843

Inventors:

Bertrand M. Hochwald - Summit NJ
Thomas Louis Marzetta - Summit NJ
Thomas J. Richardson - South Orange NJ
Wim Sweldens - New Providence NJ
Rudiger L. Urbanke - Murray Hill NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04K 110

US Classification:

375260, 375299, 375240, 375347, 370334

Abstract:

Messages according to a method of wireless signal transmission are sent as sequences of unitary space-time signals. Each signal is representable as a matrix in which each column represents a respective transmitting antenna of a transmitting array, and each row represents a time segment. Each such matrix is proportional to a complex-valued matrix, all columns of which are mutually orthonormal. A new method for creating a constellation of signal matrices comprises providing an initial signal in the form of a complex, orthonormal matrix. The method further comprises generating a further plurality of matrices by a process that assures that each of the generated matrices is related to the initial matrix as a product of one or more multiplications of the initial matrix by one or more unitary matrices.

US Patent:

6757407, Jun 29, 2004

Filed:

Nov 9, 2001

Appl. No.:

10/037743

Inventors:

Alfred M. Bruckstein - Summit NJ
Thomas J. Richardson - South Orange NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G06K 900

US Classification:

382100, 382232, 380 54, 713176

Abstract:

A method and system for watermarking and recovering a watermarked digitized image for subsequent authentication. The digitized image comprises spatial domain data signals reproduced from an original image. A transformer transforms the spatial domain data signals into frequency domain data signals, including respective magnitude and phase data signal components. Information is embedded into the magnitude data signals to develop modified data signals and the modified data signals are converted from the frequency domain to the spatial domain to generate the watermarked digitized image. For recovery, a second transformer transforms the spatial domain data signals comprising the respective original digitized image and watermarked digitized image into respective frequency domain dataset signals. A comparator responsive to the two transformer outputs compares the respective frequency domain dataset signals to identify the watermark and verify the authenticity of the image reproduction.

US Patent:

7986648, Jul 26, 2011

Filed:

Oct 31, 2007

Appl. No.:

11/933403

Inventors:

Thomas Richardson - South Orange NJ, US
Junyi Li - Bedminster NJ, US
Rajiv Laroia - Far Hills NJ, US
Xinzhou Wu - Monmouth Junction NJ, US
Saurabh Tavildar - Jersey City NJ, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 7/00

US Classification:

370310

Abstract:

Methods and apparatus implementing communications using different types of symbols, e. g. different characteristic OFDM symbols, at different times for different purposes are described. A first type of symbol is used for control signaling including conveying transmission request signals and/or transmission request response signals. A second type of symbol is used for conveying user data, e. g. , traffic signals. The symbol period for a first type symbol is larger than the symbol period for a second type symbol. The tone spacing for a first type symbol is larger than the tone spacing for a second type symbol. The methods and apparatus are well suited for peer to peer communications systems in which a peer to peer communications device operates in a half-duplex mode of operation.

US Patent:

8213538, Jul 3, 2012

Filed:

Nov 27, 2007

Appl. No.:

11/945720

Inventors:

Thomas Richardson - South Orange NJ, US
Hui Jin - Jersey City NJ, US
Rajiv Laroia - Far Hills NJ, US
Junyi Li - Chester NJ, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04L 27/04

US Classification:

375299, 375267, 375347

Abstract:

Methods and apparatus for improving the utilization of air link resources in a wireless communications system, e. g. , an OFDM MIMO system, including a base station with multiple transmit antennas are described. Superposition signaling in the downlink is employed. The superimposed signal includes a first transform result signal and a second lower power signal. The first transform result signal is generated from a first signal, which uses position modulation, e. g. , including null components and high power non-null components. Different components of the first transform result signal are directed to different transmit antennas. The first transform result signal communicates information to a first wireless terminal, e. g. , a weak receiver. The non-null received elements of the first transform result signal are utilized by a second wireless terminal, e. g.

US Patent:

8261155, Sep 4, 2012

Filed:

Mar 8, 2008

Appl. No.:

12/044962

Inventors:

Thomas Richardson - South Orange NJ, US
Naga Bhushan - San Diego CA, US
Aamod Khandekar - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H03M 13/00

US Classification:

714758, 714752

Abstract:

A novel apparatus and method for encoding data using a low density parity check (LDPC) code capable of representation by a bipartite graph are provided. To encode the data, an accumulate chain of a plurality of low degree variable nodes may be generated. The accumulate chain may then be closed to form a loop twice, once using a low degree variable nodes and once using a higher degree variable which is higher than the low degree variable node, where the higher degree variable node comprises a non-loop-closing edge. In one embodiment, the plurality of low degree variable nodes may have the same permutation on each edge.

US Patent:

8326365, Dec 4, 2012

Filed:

Oct 31, 2007

Appl. No.:

11/933390

Inventors:

Thomas Richardson - South Orange NJ, US
Vladimir Parizhsky - New York NY, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04M 1/00

US Classification:

4555621, 455561, 455 133, 4555757, 455450, 375224, 375260

Abstract:

Methods and apparatus for improved utilization of air link resources are discussed in wireless communications systems employing multi-sector base stations and wireless terminals with multiple antennas. Timing synchronization is maintained across the base station sectors, and the same set of tones are used in adjacent sectors. In a sector boundary region, which is typically a high interference region, a wireless terminal is set to a sector pair state and operated in a MIMO mode of operation, communicating with two adjacent base station antenna faces of the same base station concurrently, the two different adjacent base station antenna faces corresponding to different adjacent sectors. Thus, typically high interference sector boundary regions, are converted into high capacity regions by having the sectors coordinated and utilizing MIMO techniques.

US Patent:

8331284, Dec 11, 2012

Filed:

Mar 3, 2008

Appl. No.:

12/041627

Inventors:

Thomas Richardson - South Orange NJ, US
Junyi Li - Bedminster NJ, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04Q 7/00

US Classification:

370328

Abstract:

A communication system receives attributes associated with access terminals within a cell and groups them in accordance with similarities between the received attributes. Resource assignment messages customized to their respective attributes are transmitted to the groups, thereby ensuring that all groups receive these messages. These groups are formed dynamically as the attributes of the access terminals vary when they traverse through a cell.

US Patent:

8331965, Dec 11, 2012

Filed:

Jun 12, 2009

Appl. No.:

12/483335

Inventors:

Thomas Richardson - South Orange NJ, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 15/00
H04B 1/00
H04B 17/00

US Classification:

455501, 455 631, 455 6713

Abstract:

Methods and apparatus for detecting, controlling and/or mitigating interference are described. Various embodiments are well suited to wireless communications systems in which shared communications resources are used, e. g. , in a peer to peer communications systems lacking centralized control. In some embodiments, a communications device receives signals on shared communications resource, evaluates its capability to decode a received signal, and conditionally transmits an interference signal, e. g. , on the shared communications resource. The interference signal is intended to cause a device transmitting on the shared communications resource to switch to a different communications resource, e. g. , in response to the interference signal, so that its transmitted signal can be successfully decoded. In at least one embodiment, the shared communications resource is a peer discovery air link resource associated with a peer discovery resource identifier.