Dirk Jm Walvis

7193506, Mar 20, 2007

Aug 19, 2003

10/643316

Oleg Logvinov - East Brunswick NJ, US
Dirk Walvis - Santa Cruz CA, US
Brion Ebert - Easton PA, US
David Lawrence - Newton NJ, US

Arkados, Inc. - Piscataway NJ

G05B 11/01

34031011, 34031016, 34031015, 375258

Data throughput rate in a power line communications (“PLC”) system is controlled by generating PLC carrier signals in accordance with a PLC signal frame structure containing payload symbols where the payload symbol length is selected based on at least one of a PLC system channel quality and node configuration data. The selected payload symbol length determines the processing operations that a source PLC transceiver performs for generating PLC signals or that a destination PLC transceiver performs for extracting information content from received PLC signals. The payload symbol lengths can be selected to maximize the data throughput rate while maintaining compatibility with prior art PLC system protocols and standards that require a PLC signal frame structure and its payload portion to have fixed, predetermined lengths.

7369579, May 6, 2008

Sep 25, 2003

10/671126

Oleg Logvinov - East Brunswick NJ, US
Dirk Walvis - Santa Cruz CA, US
Lawrence F. Durfee - Washington NJ, US

H04J 3/06

370509, 370208, 370442, 34031011

Power line communication (“PLC”) signals are transmitted between a head-end PLC transceiver coupled to multiple remote PLC transceivers over a electric power and communications distribution network in accordance with a timing controlled PLC data frame which determines how much bandwidth is allocated to downstream transmission from the head-end to the remotes and to upstream transmissions from one or more of the remotes to the head-end. The configuration of the timing controlled data frame can be dynamically modified to achieve higher bandwidth for the downstream traffic and to satisfy changing bandwidth needs of each remote.

7706250, Apr 27, 2010

Sep 21, 2006

11/533987

Christian Volf Olgaard - Sunnyvale CA, US
Stephen James Bennett - San Francisco CA, US
Vakis Papaparaskeva - Sunnyvale CA, US
Dirk Walvis - Santa Cruz CA, US

LitePoint Corp. - Sunnyvale CA

H04J 11/00

370208, 375260

A signal analyzer and method for measuring signal compression levels of one or more individual orthogonal frequency division multiplexed (OFDM) signals among a plurality of OFDM signals within a composite signal.

7822130, Oct 26, 2010

Sep 21, 2006

11/533971

Dirk Walvis - Santa Cruz CA, US
Stephen James Bennett - San Francisco CA, US
Vakis Papaparaskeva - Sunnyvale CA, US
Christian Volf Olgaard - Sunnyvale CA, US
Roman Schilter - Sunnyvale CA, US

LitePoint Corporation - Sunnyvale CA

H04K 1/10

375260, 370208

Apparatus and method for testing signals from two or more OFDM transmitters simultaneously with a single VSA.

8116208, Feb 14, 2012

Jan 21, 2010

12/691387

Wassim El-Hassan - San Jose CA, US
Christian Volf Olgaard - Saratoga CA, US
Dirk Walvis - Santa Cruz CA, US

Litepoint Corporation - Sunnyvale CA

H04W 24/06
H04L 12/56

370241

A method for contemporaneously testing multiple digital data packet transceivers using predefined UL test sequences of synchronized data packets by pre-configuring test measurements, and multiplexing and interleaving portions of the data packets from the devices under test (DUTs).

20030231582, Dec 18, 2003

May 6, 2003

10/430151

Oleg Logvinov - East Brunswick NJ, US
Lawrence Durfee - Washington NJ, US
Dirk Walvis - Santa Cruz CA, US

ENIKIA L.L.C. - North Plainfield NJ

H04J011/00

370/208000, 370/210000

The invention presents a novel method to channel estimation in OFDM systems. The embodiment of this invention is a block of new logic and modifications performed to other components of the system, added to any existing OFDM receiver, which utilizes information available from other blocks as found in the receiver. This logic would improve the units' error rate because of the improved channel quality estimations it makes available. This improvement is made possible because both channel noise data and channel signal data are used in the estimation process. This data goes through a learning process over time and multiple data blocks for further improvements in the quality of the estimate. This improvement is possible without any direct communications with other remote units, but it could be used in a multi-node environment to improve the performance of the system as the whole.

20080002655, Jan 3, 2008

Jan 10, 2007

11/651945

Oleg Logvinov - East Brunswick NJ, US
Dirk Walvis - Santa Cruz CA, US
Brion Ebert - Easton PA, US
David Lawrence - Newton NJ, US

ARKADOS, Inc. - Piscataway NJ

H04Q 7/28

370340000

Data throughput rate in a power line communications (“PLC”) system is controlled by generating PLC carrier signals in accordance with a PLC signal frame structure containing payload symbols where the payload symbol length is selected based on at least one of a PLC system channel quality and node configuration data. The selected payload symbol length determines the processing operations that a source PLC transceiver performs for generating PLC signals or that a destination PLC transceiver performs for extracting information content from received PLC signals. The payload symbol lengths can be selected to maximize the data throughput rate while maintaining compatibility with prior art PLC system protocols and standards that require a PLC signal frame structure and its payload portion to have fixed, predetermined lengths.

6917888, Jul 12, 2005

May 6, 2003

10/430087

Oleg Logvinov - East Brunswick NJ, US
Lawrence F. Durfee - Washington NJ, US
Dirk Walvis - Santa Cruz CA, US

Arkados, Inc. - North Plainfield NJ

G06F019/00

702 59, 324512

Fault detection and power network quality monitoring are performed for a power line network using power line communications (“PLC”) signal transceiving and data processing capabilities. Power line signals are continuously received and processed to obtain signal data representative of power line network operating conditions that are expressed in the received power line signals. The harmonic content and noise signature of the signal data are evaluated with reference to known fault signature data and power line network topology properties for detecting and identifying the location of an existing or anticipated fault in the power line network and assessing power transmission quality of the network.