Srinivas Kandala

US Patent:

6505037, Jan 7, 2003

Filed:

Feb 23, 2000

Appl. No.:

09/510907

Inventors:

Srinivas Kandala - Vancouver WA

Assignee:

SHARP Laboratories of America, Inc. - Camas WA

International Classification:

H04Q 700

US Classification:

4552772, 4552321, 4552451

Abstract:

A system adjusts a receiving device in response to sensing symbols. An automatic gain control is adjusted in response receiving a first symbol of a data unit from a first antenna. After adjusting the automatic gain control at least a second and a third symbol of the data unit are received, and in response thereto (1) a first energy of at least one of the second and third symbols is calculated, (2) a first frequency offset of at least one of the second and third symbols is calculated, and (3) a first temporal offset of at least one of the second and third symbols is calculated. The automatic gain control in response receiving a fourth symbol of the data unit from a second antenna is received. After adjusting the automatic gain control at least a fifth and a sixth symbol of the data unit is calculated, and in response thereto (1) a second energy of at least one of the fifth and sixth symbols is calculated, (2) a second frequency offset of at least one of the fifth and sixth symbols is calculated, and (3) a second temporal offset of at least one of the fifth and sixth symbols is calculated. At least one of the first and second antenna is selected based upon a comparison between the first and second energy.

US Patent:

6856795, Feb 15, 2005

Filed:

Jan 6, 2003

Appl. No.:

10/337551

Inventors:

Srinivas Kandala - Vancouver WA, US

Assignee:

Sharp Laboratories of America, Inc. - Camas WA

International Classification:

H04Q007/00

US Classification:

4552772, 4552321, 4552451

Abstract:

A system adjusts a receiving device in response to sensing symbols. An automatic gain control is adjusted in response receiving a first symbol of a data unit from a first antenna. After adjusting the automatic gain control at least a second and a third symbol of the data unit are received, and in response thereto (1) a first energy of at least one of the second and third symbols is calculated, (2) a first frequency offset of at least one of the second and third symbols is calculated, and (3) a first temporal offset of at least one of the second and third symbols is calculated. The automatic gain control in response receiving a fourth symbol of the data unit from a second antenna is received. After adjusting the automatic gain control at least a fifth and a sixth symbol of the data unit is calculated, and in response thereto (1) a second energy of at least one of the fifth and sixth symbols is calculated, (2) a second frequency offset of at least one of the fifth and sixth symbols is calculated, and (3) a second temporal offset of at least one of the fifth and sixth symbols is calculated. At least one of the first and second antenna is selected based upon a comparison between the first and second energy.

US Patent:

6882679, Apr 19, 2005

Filed:

Dec 29, 2000

Appl. No.:

09/753048

Inventors:

V. Srinivasa Somayazulu - Tigard OR, US
Srinivas Kandala - Vancouver WA, US
John M. Kowalski - Vancouver WA, US
Chan K. Park - Glendale CA, US

Assignee:

Sharp Laboratories of America, Inc. - Camas WA

International Classification:

H04B001/69
H04B015/00
H04L027/20

US Classification:

375146, 375308, 375200

Abstract:

In a direct sequence spread spectrum data communication system an information bit is mixed with a pseudorandom noise or spreading code to produce modulated codeword for transmission. A method of bandwidth efficient M-ary phase shift key modulation encoding at least 16 bits of data to a single codeword is disclosed for extending the data rate of a spread spectrum system. Interoperability with legacy devices is maximized by maintaining structural similarity between the modulated waveforms of the extended data rate and legacy systems.

US Patent:

7050459, May 23, 2006

Filed:

Mar 30, 2001

Appl. No.:

09/823407

Inventors:

Srinivas Kandala - Vancouver WA, US

Assignee:

Sharp Laboratories of America, Inc. - Camas WA

International Classification:

H04J 3/22
H04J 3/16

US Classification:

370469, 370346, 370449

Abstract:

Devices, softwares and methods for centralized session planning while in a DCF mode. An access point plans centrally a schedule of individual sessions with each station. Then it announces to each peripheral station the onset of the session by a polling pulse that includes the return address of a MAC layer of the station. The addressed peripheral device then transmits data from its MAC layer.

US Patent:

7187668, Mar 6, 2007

Filed:

Nov 27, 2001

Appl. No.:

09/995296

Inventors:

Srinivas Kandala - Vancouver WA, US

Assignee:

Sharp Laboratories of America, Inc. - Camas WA

International Classification:

H04Q 7/24
H04L 12/26
H04L 12/413
H04J 3/02

US Classification:

370338, 378252, 378462, 378445

Abstract:

Devices, softwares and methods advance the scheduling of a next contention session upon premature termination of a contention free session. A Hybrid Coordinator detects when the exchange of wireless transmissions finishes before the contention free window is scheduled to end. Upon such detection, the Hybrid Coordinator transmits a notification to advance the scheduling of the next contention session. Upon sensing the notification, contention resumes by the participating peripherals.

US Patent:

7239626, Jul 3, 2007

Filed:

Jun 30, 2004

Appl. No.:

10/882918

Inventors:

Srinivas Kandala - Vancouver WA, US
John Michael Kowalski - Camas WA, US
Richard Thomas Bennett - Vancouver WA, US

Assignee:

Sharp Laboratories of America, Inc. - Camas WA

International Classification:

H04Q 7/24

US Classification:

370349, 370350

Abstract:

A method of synchronizing clocks in the stations of ad hoc and infrastructure networks includes providing a time stamp field in a header; reading the header by all stations in a network; extracting the time stamp information from the header by each station in the network as time information; sending extracted time information to a station clock; and adjusting the station clock as a function of the extracted time information. A system for synchronizing clocks in the stations of ad hoc and infrastructure networks includes a DLL having a comparator for receiving the time stamp information and a low-pass filter having a long time-constant for adjusting the station clock in a gradual manner; a time stamp field in a header; and time information extracted from the time stamp information of the header by each station in the network.

US Patent:

7272119, Sep 18, 2007

Filed:

May 10, 2002

Appl. No.:

10/063756

Inventors:

William Michael Rudnick - Pittsford NY, US
John M. Kowalski - Camas WA, US
Srinivas Kandala - Cupertino CA, US

Assignee:

Sharp Laboratories of America, Inc. - Camas WA

International Classification:

H04Q 7/00

US Classification:

370329, 370341, 370346, 370444, 370455

Abstract:

Embodiments of the present invention comprise systems and methods for providing transmission priority to stations in a wireless LAN system.

US Patent:

7304973, Dec 4, 2007

Filed:

Jun 30, 2003

Appl. No.:

10/610172

Inventors:

Srinivas Kandala - Vancouver WA, US

Assignee:

Sharp Laboratories of America, Inc. - Camas WA

International Classification:

H04Q 7/24
H04J 3/16

US Classification:

370338, 37039554, 370445, 370471, 714749

Abstract:

A system and method are provided for defining a Burst ACK interface in an IEEE 802. 11 network. The method comprising: using Burst ACK primitives to negotiate between peer station management entities (SMEs); establishing an interface between peer MAC entities associated with the SMEs; and, in response to negotiating with the Burst ACK primitives, using a Burst ACK protocol to communicate information between peer Quality of Service (QoS) stations (QSTAs) associated with the SMEs. Using a Burst ACK protocol to communicate information between peer QSTAs includes communicating between the peer MAC entities. In some aspects, establishing an interface between peer MAC entities includes each MAC entity: transceiving Burst ACK primitives with an associated SME; converting between Burst ACK primitives and physical layer communication MAC frames; and, transceiving communication physical layer MAC frames with a peer MAC entity, via the physical layer communication MAC frames.