Quan N Zhou

US Patent:

7734585, Jun 8, 2010

Filed:

Dec 2, 2005

Appl. No.:

11/292949

Inventors:

Amit Sharma - Fremont CA, US
Daniel Shih - San Jose CA, US
Uppili Srinivasan - Fremont CA, US
Quan Zhou - Alameda CA, US
Satishkumar Venkatasamy - Tamil Nadu, IN

Assignee:

Oracle International Corporation - Redwood Shores CA

International Classification:

G06F 17/00

US Classification:

707623

Abstract:

A system, method, computer program and article of manufacture for updateable fan-out replication with reconfigurable master association in a large, multi-node LDAP environment. A replication ring supports the addition of fan-out nodes as children to each primary node that sits on a replication ring. The fan-out nodes can be cascaded in multiple parent/child relationships and can support full replication or a subset of the parent data. Each child/parent relationship is defined by an agreement. Each fan-out node replicates changes to their immediate children and parent based upon the change details and the configured agreement, distributing the replication load.

US Patent:

8175118, May 8, 2012

Filed:

May 15, 2009

Appl. No.:

12/466997

Inventors:

Hongyuan Zhang - Sunnyvale CA, US
Rohit U. Nabar - Sunnyvale CA, US
Songping Wu - Cupertino CA, US
Hui-Ling Lou - Sunnyvale CA, US
Quan Zhou - San Jose CA, US

Assignee:

Marvell World Trade Ltd. - St. Michael

International Classification:

H04J 3/24

US Classification:

370474, 370203, 370465, 370476

Abstract:

A method of generating a data unit preamble includes generating a first field associated with at least one of packet synchronization information or frame boundary indication, and generating a second field associated with channel estimation, including generating a first channel estimation sequence (CES) symbol and generating a second CES symbol, so that at least one of 1) a sequence in the first field serves as a cyclic prefix of the first CES symbol, 2) a beginning portion of the second CES symbol serves as a cyclic postfix of the first CES symbol, or 3) an ending portion of the first CES symbol serves as a cyclic prefix of the second CES symbol.

US Patent:

8331419, Dec 11, 2012

Filed:

May 15, 2009

Appl. No.:

12/466984

Inventors:

Hongyuan Zhang - Sunnyvale CA, US
Rohit U. Nabar - Sunnyvale CA, US
Songping Wu - Cupertino CA, US
Hui-Ling Lou - Sunnyvale CA, US
Quan Zhou - San Jose CA, US

Assignee:

Marvell World Trade Ltd. - St. Michael

International Classification:

H04B 1/00

US Classification:

375141, 375260, 375364, 370510, 370514

Abstract:

A method for generating a preamble of a data unit for transmission via a communication channel includes generating a first field of the preamble using one of a first sequence or a second sequence, such that the first sequence and the second sequence are complementary sequences such that a sum of out-of-phase aperiodic autocorrelation coefficients of the first sequence and the second sequence is zero; generating, using the other one of the first sequence or the second sequence, an indicator of a start of a second field of the preamble, the second field associated with channel estimation information, such that the indicator of the start of the second field immediately follows the first field; and generating the second field of the preamble.

US Patent:

8559569, Oct 15, 2013

Filed:

Jan 26, 2012

Appl. No.:

13/358584

Inventors:

Quan Zhou - Sunnyvale CA, US
Songping Wu - Cupertino CA, US

Assignee:

Marvell International Ltd.

International Classification:

H03D 1/00

US Classification:

375343, 375316, 375344, 375340, 375342, 375354, 375355, 375362, 375364, 375365, 375368

Abstract:

Systems, methods, and other embodiments associated with preamble detection based on repeated preamble codes are described. According to one embodiment, an apparatus is provided that wirelessly receives a signal and calculates a differential output corresponding to a multiplication of the signal and a delayed version of the signal. A cross correlation is performed between the differential output and a known preamble pattern to produce a cross correlation output. A moving average calculation is performed on the cross correlation output to produce an average cross correlation. One or more peaks are detected in the average cross correlation when the average cross correlation has an amplitude greater than a threshold. When the one or more detected peaks meets predetermined criteria, the apparatus provides information about at least one of the detected peaks for subsequent signal processing.

US Patent:

8644426, Feb 4, 2014

Filed:

Jul 7, 2009

Appl. No.:

12/498755

Inventors:

Quan Zhou - Sunnyvale CA, US
Songping Wu - Cupertino CA, US
Hui-Ling Lou - Sunnyvale CA, US

Assignee:

Marvell International Ltd. - Hamilton

International Classification:

H03D 3/22
H04L 27/22

US Classification:

375332

Abstract:

A robust differential receiver is described that may be used in any frequency modulated system, including short-range radio frequency (RF) communication devices. The differential receiver provides a preamble detection approach that reduces false preamble detection, a fine carrier frequency (CFO) estimation approach that provides an extended estimation range, and robust in-band and out-of-band interference detection. The described differential receiver assures that preamble detections are not falsely triggered, and that CFO estimates are based on accurately modeled preamble waveforms that have not been distorted by phase ambiguities or in-band distortion. In this manner, the described robust differential receiver assures that CFO estimates used to compensate remaining portions of detected signals are accurate, thereby reducing the likelihood that remaining portions of the detected signal will be affected by phase ambiguity distortions, thereby enhancing the differential receiver's ability to lock onto an otherwise unavailable communication channel, and/or reducing transmission errors and/or packet loss.

US Patent:

20120219017, Aug 30, 2012

Filed:

May 7, 2012

Appl. No.:

13/465743

Inventors:

Hongyuan Zhang - Fremont CA, US
Rohit U. Nabar - Sunnyvale CA, US
Songping Wu - Cupertino CA, US
Hui-Ling Lou - Sunnyvale CA, US
Quan Zhou - San Jose CA, US

International Classification:

H04B 1/709
H04L 12/56

US Classification:

370474, 375E01002

Abstract:

A transmitter device includes a controller configured to generate a first field and a second field. The first field is at least one of a packet synchronization information field or a frame boundary indication field, the second field is a channel estimation field starting after the first field ends. The controller is configured to generate the second field at least in part by generating a first channel estimation sequence (CES) symbol and a second CES symbol. At least one of i) a sequence in the first field serves as a cyclic prefix of the first CES symbol, ii) a beginning portion of the second CES symbol serves as a cyclic postfix of the first CES symbol, or iii) an ending portion of the first CES symbol serves as a cyclic prefix of the second CES symbol.

US Patent:

20220215440, Jul 7, 2022

Filed:

Jan 7, 2021

Appl. No.:

17/143643

Inventors:

- Menlo Park CA, US
Quan Zhou - Sunnyvale CA, US
Chihoon Lee - Sunnyvale CA, US
Haiyu Lu - San Jose CA, US

International Classification:

G06Q 30/02
G06N 3/04

Abstract:

An online system for determining advertisements for retrieval is disclosed. The online system may assign a unique category path associated with a hierarchy of advertisement categories to a plurality of advertisements accessible by the online system to determine advertisement information features. The online system may determine a plurality of types of user engagements associated with prior user interactions by a user with one or more of the advertisements or types of advertisements associated with the advertisements to determine a set of user engagement features. The online system may select user engagement features, from the set, based on determined user engagement results to obtain user related features. The online system may associate the user related features with an assigned unique category path, associated with the ad information features, to generate inverted index features. The online system may apply the inverted index features as inputs to a neural network.