Adam L Kerr

US Patent:

6570527, May 27, 2003

Filed:

Sep 28, 2001

Appl. No.:

09/967258

Inventors:

Erik D. Lindskog - Sunnyvale CA
Mitchell D. Trott - Mountain View CA
Adam B. Kerr - Menlo Park CA

Assignee:

ArrayComm, Inc. - San Jose CA

International Classification:

G01S 740

US Classification:

342174, 342 42, 342 43, 342165, 342173

Abstract:

A method and apparatus are provided that determine a frequency dependent calibration vector for a set of transmit or receive chains of a radio communications system using only differential phase and amplitude between the transmit chains and the receive chains, respectively. In one embodiment, the invention includes an antenna array adapted to transmit and receive radio communications signals with a plurality of other terminals, a transmit chain to transmit a calibration signal through the antenna array to a transponder on at least two different frequency bands, and a receive chain to receive through the antenna array a transponder signal from the transponder, the transponder signal being received on at least two different frequency bands and being based on the calibration signal. A signal processor determines a frequency dependent calibration vector based on the at least two frequency bands of the transponder signal as received through the receive chain by comparing relative characteristics for the transponder signal at a first one of the at least two frequencies to relative characteristics for the transponder signal at a second one of the at least two frequencies.

US Patent:

6747594, Jun 8, 2004

Filed:

Nov 14, 2002

Appl. No.:

10/294948

Inventors:

Erik D. Lindskog - Sunnyvale CA
Mitchell D. Trott - Mountain View CA
Adam B. Kerr - Menlo Park CA

Assignee:

ArrayComm, Inc. - San Jose CA

International Classification:

G01S 740

US Classification:

342174, 342 42, 342 43, 342165, 342173

Abstract:

A method and apparatus are provided that determine a frequency dependent calibration vector for a set of transmit or receive chains of a radio communications system using only differential phase and amplitude between the transmit chains and the receive chains, respectively. In one embodiment, the invention includes an antenna array adapted to transmit and receive radio communications signals with a plurality of other terminals, a transmit chain to transmit a calibration signal through the antenna array to a transponder on at least two different frequency bands, and a receive chain to receive through the antenna array a transponder signal from the transponder, the transponder signal being received on at least two different frequency bands and being based on the calibration signal. A signal processor determines a frequency dependent calibration vector based on the at least two frequency bands of the transponder signal as received through the receive chain by comparing relative characteristics for the transponder signal at a first one of the at least two frequencies to relative characteristics for the transponder signal at a second one of the at least two frequencies.

US Patent:

6788948, Sep 7, 2004

Filed:

Sep 28, 2001

Appl. No.:

09/967767

Inventors:

Erik D. Lindskog - Sunnyvale CA
Mitchell D. Trott - Mountain View CA
Adam B. Kerr - Menlo Park CA

Assignee:

ArrayComm, Inc. - San Jose CA

International Classification:

G01S 1374

US Classification:

455504, 455 634, 455 6714, 342368, 342371, 342372, 34235702

Abstract:

A method and apparatus are provided that determine group delay for a set of transmit or receive chains over a wide frequency band without causing significant interference with simultaneous users of the system. In one embodiment, the invention includes an antenna array adapted to transmit and receive radio communications signals with a plurality of other terminals, the communications signals each using a particular minimum bandwidth, a transmit chain to transmit a calibration signal through the antenna array to a transponder on at least two different frequency bands within the minimum bandwidth, and a receive chain to receive through the antenna array a transponder signal from the transponder, the transponder signal being received on at least two different frequency bands and being based on the calibration signal. A signal processor determines a frequency dependent calibration vector based on the at least two frequency bands of the transponder signal as received through the receive chain.

US Patent:

6865377, Mar 8, 2005

Filed:

Jun 28, 2002

Appl. No.:

10/187036

Inventors:

Erik D. Lindskog - Sunnyvale CA, US
Adam B. Kerr - Menlo Park CA, US
Christopher Brunner - Sunnyvale CA, US
Mitchell D. Trott - Mountain View CA, US

Assignee:

ArrayComm, Inc. - San Jose CA

International Classification:

H04B001/02
H04C007/02

US Classification:

455101, 455522, 375299

Abstract:

A method and apparatus are provided that can combine the benefits of beamforming with transmit diversity. In one embodiment, the invention includes sampling a signal received from a remote radio at elements of an antenna array, deriving spatial parameters for transmitting a signal to the remote radio from an antenna array, sampling the signal received from the remote radio at elements of at least one additional antenna array, and deriving spatial parameters for transmitting a signal to the remote radio from the at least one additional antenna array. The invention further includes generating diversity parameters for transmitting a signal to the remote radio using each antenna array as an element of a diversity array, and transmitting a signal to the remote radio using the spatial parameters and the diversity parameters.

US Patent:

6950630, Sep 27, 2005

Filed:

Mar 13, 2003

Appl. No.:

10/387933

Inventors:

Todd H. Chauvin - Sunnyvale CA, US
Adam B. Kerr - Menlo Park CA, US
Athanasios A. Kasapi - San Francisco CA, US

Assignee:

ArrayComm, Inc. - San Jose CA

International Classification:

H04B017/00
H04B001/38

US Classification:

455 6711, 455561, 4555621, 4552261, 375210

Abstract:

Spatial and temporal characteristics of received radio signals in a multiple user radio system can be estimated based on signals received from the users. In one embodiment, the invention includes measuring radio frequency signals received at different elements of an antenna system over time, the received signals corresponding at least in part to transmissions received from a system user, accumulating the signal measurements into a first matrix, generating a second matrix representing the transmissions of the system user, cross-correlating the first and second matrices to form a third matrix, and multiplying the third matrix with a product of the second matrix to form a fourth matrix in which the elements of the fourth matrix characterize the radio channel traversed by transmissions of the system user.

US Patent:

6973314, Dec 6, 2005

Filed:

Sep 28, 2001

Appl. No.:

09/967058

Inventors:

Sarah Kate Wilson - Menlo Park CA, US
Todd Henry Chauvin - Sunnyvale AZ, US
Adam Bruce Kerr - Menlo Park CA, US
Christopher Brunner - Sunnyvale CA, US
Mitchell D. Trott - Mountain View CA, US
Athanasios A. Kapasi - San Francisco CA, US
Erik David Lindskog - Sunnyvale CA, US

Assignee:

ArrayComm LLC. - San Jose CA

International Classification:

H04Q007/20

US Classification:

4554521, 4554522, 455453

Abstract:

A system and related methods for clustering multi-point communication targets is presented. According to one aspect of the invention, a method comprising measuring one or more performance characteristics associated for each of at least a subset of a plurality of targets in a wireless communication system, and selectively building one or more clusters, each cluster including one or more target(s) and sharing a wireless communication channel, based at least in part on the performance characteristics.

US Patent:

7020107, Mar 28, 2006

Filed:

Jan 21, 2003

Appl. No.:

10/348923

Inventors:

Athanasios A. Kasapi - San Francisco CA, US
Adam B. Kerr - Menlo Park CA, US
Xiaoming Yu - Cupertino CA, US
Lars Johan Persson - Stockholm, SE

Assignee:

Arraycomm, LLC - San Jose CA

International Classification:

H04Q 7/00

US Classification:

370329, 370339, 370344, 370503

Abstract:

An embodiment of the invention provides a method for effecting switchback on a spatial division multiple access (SDMA) PHS channel. A communication signal is broadcast over each of one or more SDMA channels of a multi-access channel to one or more corresponding user terminals. A set of transmit spatial weights is determined for a synchronization burst to a user terminal attempting to reestablish communication over an SDMA channel of the multi-access channel. The set of transmit spatial weights is determined such that interference caused by one or more communication signals to the synchronization burst is reduced.

US Patent:

7039363, May 2, 2006

Filed:

Sep 28, 2001

Appl. No.:

09/967896

Inventors:

Athanasios A. Kasapi - San Francisco CA, US
Mitchell D. Trott - Mountain View CA, US
Peter G. Khoury - San Francisco CA, US
Adam B. Kerr - Menlo Park CA, US
Serge Barbosa Da Torre - San Raphael, FR

Assignee:

ArrayComm LLC - San Jose CA

International Classification:

H04B 17/00
H04B 7/212
H04J 3/12

US Classification:

455 6711, 455561, 4555621, 455101, 370347, 370522

Abstract:

Methods and apparatus for calculating spatial processing strategies in adaptive antenna array processing systems. Reference signal quality, intersymbol interference, data processed and received signal quality can be determined by burst type or remote device type and used to determine a synthetic signal level for use in developing a spatial processing strategy. A synthetic signal have an isotropically distributed component can be added to the antennas in the array or the diagonal elements of the received signal covariance matrix to develop uplink and downlink spatial processing strategies. Different synthetic signals at different signal levels can be used to develop different uplink and downlink spatial processing strategies. The downlink signal level can be larger than the uplink signal level. Uplink and downlink processing strategies can be developed in substantially the same way.