Edem J Ibragimov from 1295 Buchanan Dr, Santa Clara, CA 95051, age 69, Phone: 4082612489

Us Patents

Methods And Apparatus For Chromatic Dispersion Compensation
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US Patent:

6822747, Nov 23, 2004
Filed:

Jul 10, 2002
Appl. No.:

10/191486
Inventors:

Michael Rivera - Shrewsbury MA
Edem Ibragimov - San Jose CA
Assignee:

Yafo Networks, Inc. - Hanover MD
International Classification:

G01B 902
US Classification:

356519
Abstract:

Methods and apparatus for chromatic dispersion compensation are provided. The apparatus includes a Gires-Tournois etalon, an optical beam separator, a GTE controller, an optical distortion analyzer, and a feedback controller.

Adaptive Signal Latency Control For Communications Systems Signals
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US Patent:

6922440, Jul 26, 2005
Filed:

Dec 17, 2002
Appl. No.:

10/321893
Inventors:

Qian Yu - Cupertino CA, US
Venugopal Balasubramonian - San Jose CA, US
Jishnu Bhattacharjee - San Jose CA, US
Debanjan Mukherjee - San Jose CA, US
Abhijit Phanse - Santa Clara CA, US
Abhijit G. Shanbhag - San Jose CA, US
Edem Ibragimov - San Jose CA, US
Assignee:

Scintera Networks, Inc. - San Jose CA
International Classification:

H04L025/17
US Classification:

375233, 375350, 708290, 708313, 360 65
Abstract:

An apparatus and method for adaptively introducing a compensating signal latency related to a signal latency of a data symbol decision circuit. Adaptive timing control circuitry, including an interpolating mixer implemented as a tapped delay line with correlated tap coefficients, introduces a latency adaptively and substantially matching the latency of the data decision circuit for use within an adaptive equalizer, thereby minimizing the mean-squared error of such decision circuit. This adaptive latency is used in generating the feedback error signal which, in turn, can be used by the feedforward equalizer for dynamically adjusting its adaptive filter tap coefficients.

Adaptation Structure And Methods For Analog Continuous Time Equalizers
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US Patent:

7016406, Mar 21, 2006
Filed:

Apr 29, 2003
Appl. No.:

10/426588
Inventors:

Abhijit Phanse - Sunnyvale CA, US
Abhijit G. Shanbhag - San Jose CA, US
Qian Yu - Cupertino CA, US
Venugopal Balasubramonian - San Jose CA, US
Jishnu Bhattacharjee - San Jose CA, US
Prashant Choudhary - San Jose CA, US
Debanjan Mukherjee - San Jose CA, US
Fabian Giroud - San Jose CA, US
Edem Ibragimov - San Jose CA, US
Assignee:

Scintera Networks - San Jose CA
International Classification:

H03H 7/40
US Classification:

375232
Abstract:

Tap coefficients for fractionally-spaced equalizers are updated iteratively using error statistics from an input bit stream and an output bit stream, such as from a forward error correction circuit. The process continues until the errors converge to a sufficiently small number. Knowledge of the error patterns are used apriori to adaptively change the tap coefficients in a feedforward filter.

Decision Feedback Equalizer With Dynamic Feedback Control
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US Patent:

7035330, Apr 25, 2006
Filed:

Jan 30, 2004
Appl. No.:

10/768408
Inventors:

Abhijit G. Shanbhag - San Jose CA, US
Qian Yu - Cupertino CA, US
Abhijit M. Phanse - Santa Clara CA, US
Jishnu Bhatacharjee - San Jose CA, US
Debanjan Mukherjee - San Jose CA, US
Venugopal Balasubramonian - San Jose CA, US
Fabian Giroud - San Jose CA, US
Edem Ibragimov - San Jose CA, US
Assignee:

Scintera Networks, Inc. - San Jose CA
International Classification:

H03H 7/40
H03K 5/159
US Classification:

375234, 375229, 375230, 375231, 375232, 375233
Abstract:

A decision feedback equalizer with dynamic feedback control for use in an adaptive signal equalizer. Timing within the decision feedback loop is dynamically controlled to optimize recovery of the data signal by the output signal slicer. The dynamic timing is controlled by a signal formed as a combination of feedback and feedforward signals. The feedback signal is an error signal related to a difference between pre-slicer and post-slicer signals. The feedforward signal is formed by differentiating and delaying the incoming data signal.

Decision Feedback Equalizer With Dynamic Feedback Control
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US Patent:

7120193, Oct 10, 2006
Filed:

Mar 2, 2005
Appl. No.:

11/070485
Inventors:

Edem Ibragimov - Santa Clara CA, US
Qian Yu - Santa Clara CA, US
Prashant Choudhary - San Jose CA, US
Assignee:

Scintera Networks, Inc. - San Jose CA
International Classification:

H03H 7/30
H03H 7/40
H03K 5/159
US Classification:

375233, 375229, 375230, 375232, 375234
Abstract:

A decision feedback equalizer with dynamic feedback control for use in an adaptive signal equalizer. Timing within the decision feedback loop is dynamically controlled to optimize recovery of the data signal by the output signal slicer.

Adaptive Signal Equalizer With Adaptive Error Timing And Precursor/Postcursor Configuration Control
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US Patent:

7266145, Sep 4, 2007
Filed:

Dec 17, 2002
Appl. No.:

10/321876
Inventors:

Venugopal Balasubramonian - San Jose CA, US
Jishnu Bhattacharjee - San Jose CA, US
Edem Ibragimov - San Jose CA, US
Debanjan Mukherjee - San Jose CA, US
Abhijit Phanse - Santa Clara CA, US
Abhijit G. Shanbhag - San Jose CA, US
Qian Yu - Cupertino CA, US
Assignee:

Scintera Networks, Inc. - San Jose CA
International Classification:

H03H 7/30
H03H 7/40
H03K 5/159
US Classification:

375232, 375233, 375231, 375340, 375230, 375229, 375347, 375234
Abstract:

An adaptive signal equalizer with a feedforward filter in which the feedback error signal and corresponding incoming data signal are dynamically aligned in time using signal interpolation, and further, to control the precursor/postcursor filter taps configuration, thereby producing more adaptive filter tap coefficient signals for significantly improved and robust signal equalization.

Channel Monitoring And Identification And Performance Monitoring In A Flexible High Speed Signal Processor Engine
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US Patent:

7339988, Mar 4, 2008
Filed:

Jul 3, 2003
Appl. No.:

10/614587
Inventors:

Abhijit G. Shanbhag - San Jose CA, US
Abhijit Phanse - Sunnyvale CA, US
Jishnu Bhattacharjee - San Jose CA, US
Debanjan Mukherjee - San Jose CA, US
Prashant Choudhary - San Jose CA, US
Edem Ibragimov - San Jose CA, US
Venugopal Balasubramonian - San Jose CA, US
Qian Yu - Cupertino CA, US
Madabusi Govindarajan - Sunnyvale CA, US
Assignee:

Scintera Networks, Inc. - San Jose CA
International Classification:

H03K 5/159
H04B 1/10
US Classification:

375232, 375233, 375350
Abstract:

Systems and methods are disclosed to provide channel monitoring and/or performance monitoring for a communication channel. For example, in accordance with an embodiment of the present invention, an equalizer is disclosed that equalizes for channel distortions and also provides channel and performance monitoring information, such as for example bandwidth estimation, channel identification, signal-to-noise ratio, chromatic dispersion, and/or polarization-mode dispersion.

Adaptive Signal Latency Control For Communications Systems Signals
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US Patent:

7379495, May 27, 2008
Filed:

Feb 27, 2004
Appl. No.:

10/789702
Inventors:

Qian Yu - Santa Clara CA, US
Venugopal Balasubramonian - Campbell CA, US
Jishnu Bhattacharjee - San Jose CA, US
Debanjan Mukherjee - San Jose CA, US
Abhijit Phanse - Cupertino CA, US
Abhijit G. Shanbhag - Sunnyvale CA, US
Edem Ibragimov - Santa Clara CA, US
Fabian Giroud - San Jose CA, US
Assignee:

Scintera Networks Inc. - Sunnyvale CA
International Classification:

H04B 3/46
US Classification:

375232, 375233
Abstract:

An apparatus and method for adaptively introducing a compensating signal latency related to a signal latency of a data symbol decision circuit. Adaptive timing control circuitry, including an interpolating mixer implemented as a tapped delay line with correlated tap coefficients, introduces a latency adaptively and substantially matching the latency of the data decision circuit for use within an adaptive equalizer, thereby minimizing the mean-squared error of such decision circuit. This adaptive latency is used in generating the feedback error signal which, in turn, can be used by the feedforward equalizer for dynamically adjusting its adaptive filter tap coefficients.