Patents by Inventor Akbar GHASEMI
Akbar GHASEMI has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20220345685Abstract: An imaging system is provided comprising: a memory storing instructions which, when executed by processing circuitry, cause the processing circuitry to perform operations comprising: determining multiple image regions of interest (ROIs) within a camera image plane that correspond to one or more three-dimensional (3D) world object images; determining multiple radar ROIs that correspond to one or more 3D world objects; determining 3D world distances corresponding to the radar ROIs; determining multiple co-registered ROI pairs by co-registering individual image ROIs with individual radar ROIs corresponding to common 3D world objects; adjusting one or more parameters associated with the camera, based upon the co-registered ROI pairs.Type: ApplicationFiled: July 7, 2022Publication date: October 27, 2022Inventors: Mohammad Amin Arbabian, Akbar Ghasemi, Matt Thornton, Hao Nan, Mashhour Solh
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Patent number: 11418773Abstract: An imaging system is provided comprising: a memory storing instructions which, when executed by processing circuitry, cause the processing circuitry to perform operations comprising: determining multiple image regions of interest (ROIs) within a camera image plane that correspond to one or more three-dimensional (3D) world object images; determining multiple radar ROIs that correspond to one or more 3D world objects; determining 3D world distances corresponding to the radar ROIs; determining multiple co-registered ROI pairs by co-registering individual image ROIs with individual radar ROIs corresponding to common 3D world objects; adjusting one or more parameters associated with the camera, based upon the co-registered ROI pairs.Type: GrantFiled: April 21, 2020Date of Patent: August 16, 2022Assignee: Plato Systems, Inc.Inventors: Mohammad Amin Arbabian, Akbar Ghasemi, Matt Thornton, Hao Nan, Mashhour Solh
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Publication number: 20210329221Abstract: An imaging system is provided comprising: a memory storing instructions which, when executed by processing circuitry, cause the processing circuitry to perform operations comprising: determining multiple image regions of interest (ROIs) within a camera image plane that correspond to one or more three-dimensional (3D) world object images; determining multiple radar ROIs that correspond to one or more 3D world objects; determining 3D world distances corresponding to the radar ROIs; determining multiple co-registered ROI pairs by co-registering individual image ROIs with individual radar ROIs corresponding to common 3D world objects; adjusting one or more parameters associated with the camera, based upon the co-registered ROI pairs.Type: ApplicationFiled: April 21, 2020Publication date: October 21, 2021Inventors: Mohammad Amin Arbabian, Akbar Ghasemi, Matt Thornton, Hao Nan, Mashhour Solh
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Publication number: 20210083798Abstract: A transmitter of a communications system includes a first encoder configured to apply a shaping operation to a data signal to generate a shaped data signal, a second encoder configured to encode the shaped data signal according to a forward error correction (FEC) scheme to generate an encoded signal, and a constellation mapper configured to modulate the encoded signal to symbol values according to a modulation scheme to generate a corresponding symbol stream for transmission through the communications system. The shaping operation reduces average constellation energy for constellations of the modulation scheme.Type: ApplicationFiled: July 31, 2020Publication date: March 18, 2021Inventors: Shahab OVEIS GHARAN, Kim B. ROBERTS, Akbar GHASEMI, Mahmoud TAHERZADEHBOROUJENI
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Patent number: 10735135Abstract: A transmitter of a communications system includes a first encoder configured to apply a shaping operation to a data signal to generate a shaped data signal, a second encoder configured to encode the shaped data signal according to a forward error correction (FEC) scheme to generate an encoded signal, and a constellation mapper configured to modulate the encoded signal to symbol values according to a modulation scheme to generate a corresponding symbol stream for transmission through the communications system. The shaping operation reduces average constellation energy for constellations of the modulation scheme.Type: GrantFiled: October 8, 2019Date of Patent: August 4, 2020Assignee: Ciena CorporationInventors: Shahab Oveis Gharan, Kim B. Roberts, Akbar Ghasemi, Mahmoud Taherzadehboroujeni
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Publication number: 20200036475Abstract: A transmitter of a communications system includes a first encoder configured to apply a shaping operation to a data signal to generate a shaped data signal, a second encoder configured to encode the shaped data signal according to a forward error correction (FEC) scheme to generate an encoded signal, and a constellation mapper configured to modulate the encoded signal to symbol values according to a modulation scheme to generate a corresponding symbol stream for transmission through the communications system. The shaping operation reduces average constellation energy for constellations of the modulation scheme.Type: ApplicationFiled: October 8, 2019Publication date: January 30, 2020Inventors: Shahab OVEIS GHARAN, Kim B. ROBERTS, Akbar GHASEMI, Mahmoud TAHERZADEHBOROUJENI
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Patent number: 10396902Abstract: A method of data symbol recovery in a coherent receiver of an optical communications system includes processing data symbol estimates detected from a received optical signal, and determining recovered symbol values from the processed data symbol estimates. The recovered symbol values belong to a symbol constellation having a predetermined asymmetry. Processing the data symbol estimates compensates phase noise that is greater than one decision region of the symbol constellation. A coherent receiver of an optical communications system includes a module configured to process data symbol estimates detected from a received optical signal and a decision circuit configured to determine recovered symbol values from the processed data symbol estimates. The recovered symbol values belong to a symbol constellation having a predetermined asymmetry. Processing the data symbol estimates compensates phase noise that is greater than one decision region of the symbol constellation.Type: GrantFiled: September 19, 2016Date of Patent: August 27, 2019Assignee: Ciena CorporationInventors: Shahab Oveis Gharan, Kim B. Roberts, Mahmoud Taherzadehboroujeni, Amir Khandani, Akbar Ghasemi
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Publication number: 20170272207Abstract: A received signal is received over a noise channel. A stream of received symbols is recovered from the received signal. Each symbol is decoded into one or more bits, where a decoded bit of the symbol has a high probability of being in error, and a probability of being a ‘1’ substantially different from 0.5. An inverse mapping is performed on the decoded bits, where the output of the inverse mapping is a stream of bits with a very low probability of being in error and a probability of being a ‘1’ substantially equal to 0.5.Type: ApplicationFiled: June 8, 2017Publication date: September 21, 2017Inventors: Shahab OVEIS GHARAN, Kim B. ROBERTS, Akbar GHASEMI, Mahmoud TAHERZADEHBOROUJENI
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Patent number: 9698939Abstract: A method of transmitting a data signal using an optical transmitter of an optical communications system. A first encoder processes an N-bit input vector in accordance with a first mapping to generate a corresponding M-bit data stream. A Forward Error Correction encoder processes the M-bit data stream in accordance with a predetermined FEC encoding scheme to generate an encoded signal. A constellation mapper maps the encoded signal to symbol values in accordance with a predetermined modulation scheme to generate a corresponding symbol stream. A modulator modulates a carrier light in accordance with the encoded symbol stream to generate an optical signal for transmission through the optical communications system. The first mapping can be adjusted to maximize performance of the optical communications system.Type: GrantFiled: June 13, 2013Date of Patent: July 4, 2017Assignee: Ciena CorporationInventors: Shahab Oveis Gharan, Kim B. Roberts, Akbar Ghasemi, Mahmoud Taherzadehboroujeni
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Patent number: 9596035Abstract: A method of data symbol recovery. An optical signal is modulated by a transmitter using a modulation scheme comprising a symbol constellation having a predetermined asymmetry and detected at a receiver. Phase error estimates corresponding to data symbol estimates detected from the received optical signal are calculated. A phase rotation is calculated based on the phase error estimates, using a filter function, and the phase rotation applied to at least one data symbol estimate to generate a corresponding rotated symbol estimate. The phase error estimates model the asymmetry of the symbol constellation, such that the computed phase rotation can compensate phase noise that is greater than one decision region of the symbol constellation.Type: GrantFiled: November 29, 2012Date of Patent: March 14, 2017Assignee: Ciena CorporationInventors: Shahab Oveis Gharan, Kim B. Roberts, Mahmoud Taherzadehboroujeni, Amir Khandani, Akbar Ghasemi
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Publication number: 20170005734Abstract: A method of data symbol recovery in a coherent receiver of an optical communications system includes processing data symbol estimates detected from a received optical signal, and determining recovered symbol values from the processed data symbol estimates. The recovered symbol values belong to a symbol constellation having a predetermined asymmetry. Processing the data symbol estimates compensates phase noise that is greater than one decision region of the symbol constellation. A coherent receiver of an optical communications system includes a module configured to process data symbol estimates detected from a received optical signal and a decision circuit configured to determine recovered symbol values from the processed data symbol estimates. The recovered symbol values belong to a symbol constellation having a predetermined asymmetry. Processing the data symbol estimates compensates phase noise that is greater than one decision region of the symbol constellation.Type: ApplicationFiled: September 19, 2016Publication date: January 5, 2017Applicant: Ciena CorporationInventors: Shahab OVEIS GHARAN, Kim B. ROBERTS, Mahmoud TAHERZADEHBOROUJENI, Amir KHANDANI, Akbar GHASEMI
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Publication number: 20140369680Abstract: A method of transmitting a data signal using an optical transmitter of an optical communications system. A first encoder processes an N-bit input vector in accordance with a first mapping to generate a corresponding M-bit data stream. A Forward Error Correction encoder processes the M-bit data stream in accordance with a predetermined FEC encoding scheme to generate an encoded signal. A constellation mapper maps the encoded signal to symbol values in accordance with a predetermined modulation scheme to generate a corresponding symbol stream. A modulator modulates a carrier light in accordance with the encoded symbol stream to generate an optical signal for transmission through the optical communications system. The first mapping can be adjusted to maximize performance of the optical communications system.Type: ApplicationFiled: June 13, 2013Publication date: December 18, 2014Applicant: CIENA CORPORATIONInventors: Shahab OVEIS GHARAN, Kim B. ROBERTS, Akbar GHASEMI, Mahmoud TAHERZADEHBOROUJENI
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Publication number: 20130089342Abstract: A method of data symbol recovery. An optical signal is modulated by a transmitter using a modulation scheme comprising a symbol constellation having a predetermined asymmetry and detected at a receiver. Phase error estimates corresponding to data symbol estimates detected from the received optical signal are calculated. A phase rotation is calculated based on the phase error estimates, using a filter function, and the phase rotation applied to at least one data symbol estimate to generate a corresponding rotated symbol estimate. The phase error estimates model the asymmetry of the symbol constellation, such that the computed phase rotation can compensate phase noise that is greater than one decision region of the symbol constellation.Type: ApplicationFiled: November 29, 2012Publication date: April 11, 2013Inventors: Shahab OVEIS GHARAN, Kim B. ROBERTS, Mahmoud TAHERZADEHBOROUJENI, Amir KHANDANI, Akbar GHASEMI