Patents by Inventor Hamid Jafarkhani
Hamid Jafarkhani 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: 20250119330Abstract: Communication systems and methods in accordance with various embodiments of the invention utilize modulation on zeros. Carrier frequency offsets (CFO) can result in an unknown rotation of all zeros of a received signal's z-transform. Therefore, a binary MOCZ scheme (BMOCZ) can be utilized in which the modulated binary data is encoded using a cycling register code (e.g. CPC or ACPC), enabling receivers to determine cyclic shifts in the BMOCZ symbol remitting from a CFO. Receivers in accordance with several embodiments of the invention include decoders capable of decoding information bits from received discrete-time baseband signals by: estimating a timing offset for the received signal; determining a plurality of zeros of a z-transform of the received symbol; identifying zeros from the plurality of zeros that encode received bits by correcting fractional rotations resulting from the CFO; and decoding information bits based upon the received bits using a cycling register code.Type: ApplicationFiled: October 18, 2024Publication date: April 10, 2025Applicants: California Institute of Technology, The Regents of the University of California, MOXZ GmbHInventors: Philipp Walk, Babak Hassibi, Peter Jung, Hamid Jafarkhani
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Publication number: 20240354589Abstract: Process and device configurations are provided for bidirectional quantized communication and buffered aggregation. In one embodiment, a method is provided for machine communication and to improve machine communication for machine learning models. Quantized communication by a server device can include sampling at least one client device to request a local model update using a hidden state, and receiving a quantized difference for a model of the at least one client device. The method can also include aggregating model updates in a buffer, performing a global update on a server model and updating the hidden state model using the server model. Quantized communication may be used for transmitting a hidden state update to the at least one client device. Processes and devices may also use Gossiped and quantized communication of hidden state model updates to at least one additional node to allow for Online Multi-Kernel Learning (OMKL).Type: ApplicationFiled: April 16, 2024Publication date: October 24, 2024Applicant: The Regents of the University of CaliforniaInventors: Hamid JAFARKHANI, Tomas ORTEGA
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Publication number: 20240314006Abstract: Communication systems and methods in accordance with various embodiments of the invention utilize modulation on zeros. Carrier frequency offsets (CFO) can result in an unknown rotation of all zeros of a received signal's z-transform. Therefore, a binary MOCZ scheme (BMOCZ) can be utilized in which the modulated binary data is encoded using a cycling register code (e.g. CPC or ACPC), enabling receivers to determine cyclic shifts in the BMOCZ symbol resulting from a CFO. Receivers in accordance with several embodiments of the invention include decoders capable of decoding information bits from received discrete-time baseband signals by: estimating a timing offset for the received signal; determining a plurality of zeros of a z-transform of the received symbol; identifying zeros from the plurality of zeros that encode received bits by correcting fractional rotations resulting from the CFO; and decoding information bits based upon the received bits using a cycling register code.Type: ApplicationFiled: October 20, 2023Publication date: September 19, 2024Applicants: California Institute of Technology, The Regents of the University of California, Technische Universität BerlinInventors: Philipp Walk, Babak Hassibi, Peter Jung, Hamid Jafarkhani
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Patent number: 11990224Abstract: Methods, devices, and systems that are related to facilitating an automated, fast and accurate model for cardiac image segmentation, particularly for image data of children with complex congenital heart disease are disclosed. In one example aspect, a generative adversarial network is disclosed. The generative adversarial network includes a generator configured to generate synthetic imaging samples associated with a cardiovascular system, and a discriminator configured to receive the synthetic imaging samples from the generator and determine probabilities indicating likelihood of the synthetic imaging samples corresponding to real cardiovascular imaging sample. The discriminator is further configured to provide the probabilities determined by the discriminator to the generator and the discriminator to allow the parameters of the generator and the parameters of the discriminator to be adjusted iteratively until an equilibrium between the generator and the discriminator is established.Type: GrantFiled: March 26, 2021Date of Patent: May 21, 2024Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Hamid Jafarkhani, Saeed Karimi-Bidhendi, Arash Kheradvar
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Patent number: 11799704Abstract: Communication systems and methods in accordance with various embodiments of the invention utilize modulation on zeros. Carrier frequency offsets (CFO) can result in an unknown rotation of all zeros of a received signal's z-transform. Therefore, a binary MOCZ scheme (BMOCZ) can be utilized in which the modulated binary data is encoded using a cycling register code (e.g. CPC or ACPC), enabling receivers to determine cyclic shifts in the BMOCZ symbol resulting from a CFO. Receivers in accordance with several embodiments of the invention include decoders capable of decoding information bits from received discrete-time baseband signals by: estimating a timing offset for the received signal; determining a plurality of zeros of a z-transform of the received symbol; identifying zeros from the plurality of zeros that encode received bits by correcting fractional rotations resulting from the CFO; and decoding information bits based upon the received bits using a cycling register code.Type: GrantFiled: May 5, 2022Date of Patent: October 24, 2023Assignees: California Institute of Technology, The Regents of the University of California, Technische Universität BerlinInventors: Philipp Walk, Babak Hassibi, Peter Jung, Hamid Jafarkhani
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Patent number: 11765008Abstract: Communication systems and methods in accordance with various embodiments of the invention utilize modulation on zeros. Carrier frequency offsets (CFO) can result in an unknown rotation of all zeros of a received signal's z-transform. Therefore, a binary MOCZ scheme (BMOCZ) can be utilized in which the modulated binary data is encoded using a cycling register code (e.g. CPC or ACPC), enabling receivers to determine cyclic shifts in the BMOCZ symbol resulting from a CFO. Receivers in accordance with several embodiments of the invention include decoders capable of decoding information bits from received discrete-time baseband signals by: estimating a timing offset for the received signal; determining a plurality of zeros of a z-transform of the received symbol; identifying zeros from the plurality of zeros that encode received bits by correcting fractional rotations resulting from the CFO; and decoding information bits based upon the received bits using a cycling register code.Type: GrantFiled: May 5, 2022Date of Patent: September 19, 2023Assignees: California Institute of Technology, The Regents of the University of California, Technische Universität BerlinInventors: Philipp Walk, Babak Hassibi, Peter Jung, Hamid Jafarkhani
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Patent number: 11651487Abstract: Devices, systems and methods related to techniques for performing four-chamber segmentation of echocardiograms are disclosed. In one example aspect, a method for generating segmented image data based on an input echocardiogram includes receiving an input echocardiogram that includes information associated with four chambers of a heart, performing segmentation on the information associated with the four chambers using an adversarial model that comprises a first artificial neural network with multiple layers, and combining data from selected layers of the first artificial neural network to generate an output image that includes the segmented four chambers of the heart.Type: GrantFiled: July 10, 2020Date of Patent: May 16, 2023Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Arghavan Arafati, Hamid Jafarkhani, Arash Kheradvar
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Publication number: 20230092437Abstract: Communication systems and methods in accordance with various embodiments of the invention utilize modulation on zeros. Carrier frequency offsets (CFO) can result in an unknown rotation of all zeros of a received signal's z-transform. Therefore, a binary MOCZ scheme (BMOCZ) can be utilized in which the modulated binary data is encoded using a cycling register code (e.g. CPC or ACPC), enabling receivers to determine cyclic shifts in the BMOCZ symbol resulting from a CFO. Receivers in accordance with several embodiments of the invention include decoders capable of decoding information bits from received discrete-time baseband signals by: estimating a timing offset for the received signal; determining a plurality of zeros of a z-transform of the received symbol; identifying zeros from. the plurality of zeros that encode received bits by correcting fractional rotations resulting from the CFO; and decoding information bits based upon the received bits using a cycling register code.Type: ApplicationFiled: May 5, 2022Publication date: March 23, 2023Applicants: California Institute of Technology, The Regents of the University of California, Technische Universität BerlinInventors: Philipp Walk, Babak Hassibi, Peter Jung, Hamid Jafarkhani
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Publication number: 20230037969Abstract: Processes and device configurations are provided for generating and using flexible storage codes. Methods and configurations described herein can reconstruct and recover data from a distributed network in the event of one or more failures or erasures. According to embodiments, a method includes determining the number of nodes and number of symbols of a flexible storage code, and reconstructing the information using the flexible storage code and determined numbers of nodes and symbols. The flexible storage code may be configured for a flexible number of nodes and symbols for information to use a subarray of symbols and nodes of a storage code array for information. Flexible storage codes may provide a framework for a reconstruction configuration using one or more of a flexible locally recoverable code (LRC), flexible partial maximum distance separable code (PMDSC), and flexible minimum storage regenerating code (MSRC).Type: ApplicationFiled: July 15, 2022Publication date: February 9, 2023Applicant: The Regents of the University of CaliforniaInventors: Zhiying WANG, Weiqi LI, Hamid Jafarkhani
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Patent number: 11368196Abstract: Communication systems and methods in accordance with various embodiments of the invention utilize modulation on zeros. Carrier frequency offsets (CFO) can result in an unknown rotation of all zeros of a received signal's z-transform. Therefore, a binary MOCZ scheme (BMOCZ) can be utilized in which the modulated binary data is encoded using a cycling register code (e.g. CPC or ACPC), enabling receivers to determine cyclic shifts in the BMOCZ symbol resulting from a CFO. Receivers in accordance with several embodiments of the invention include decoders capable of decoding information bits from received discrete-time baseband signals by: estimating a timing offset for the received signal; determining a plurality of zeros of a z-transform of the received symbol; identifying zeros from the plurality of zeros that encode received bits by correcting fractional rotations resulting from the CFO; and decoding information bits based upon the received bits using a cycling register code.Type: GrantFiled: March 17, 2021Date of Patent: June 21, 2022Assignees: California Institute of Technology, The Regents of the University of California, Technische Universität BerlinInventors: Philipp Walk, Babak Hassibi, Peter Jung, Hamid Jafarkhani
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Publication number: 20220052728Abstract: Communication systems and methods in accordance with various embodiments of the invention utilize modulation on zeros. Carrier frequency offsets (CFO) can result in an unknown rotation of all zeros of a received signal's z-transform. Therefore, a binary MOCZ scheme (BMOCZ) can be utilized in which the modulated binary data is encoded using a cycling register code (e.g. CPC or ACPC), enabling receivers to determine cyclic shifts in the BMOCZ symbol resulting from a CFO. Receivers in accordance with several embodiments of the invention include decoders capable of decoding information bits from received discrete-time baseband signals by: estimating a timing offset for the received signal; determining a plurality of zeros of a z-transform of the received symbol; identifying zeros from the plurality of zeros that encode received bits by correcting fractional rotations resulting from the CFO; and decoding information bits based upon the received bits using a cycling register code.Type: ApplicationFiled: March 17, 2021Publication date: February 17, 2022Applicants: California Institute of Technology, The Regents of the University of California, Technische Universität BerlinInventors: Philipp Walk, Babak Hassibi, Peter Jung, Hamid Jafarkhani
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Patent number: 11228323Abstract: Methods and devices are provided for error correction of distributed data in distributed systems using Reed-Solomon codes. In one embodiment, processes are provided for error correction that include receiving a first correction code for data fragments stored in storage nodes, constructing a second correction code responsive to an unavailable storage node of the storage nodes, performing erasure repair of the unavailable storage node, and outputting a corrected data fragment. The first correction code is a Reed-Solomon code represented as a polynomial and the second correction code is represented as a second polynomial with an increased subpacketization size. Processes are configured to account for repair bandwidth and sub-packetization size. Code constructions and repair schemes accommodate different sizes of evaluation points and provide a flexible tradeoff between the subpacketization size repair bandwidth of codes.Type: GrantFiled: May 29, 2020Date of Patent: January 18, 2022Assignee: The Regents of the University of CaliforniaInventors: Zhiying Wang, Weiqi Li, Hamid Jafarkhani
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Patent number: 11182896Abstract: A method of detecting whether or not a body chamber has an abnormal structure or function including: (a) providing a stack of images as input to a system comprising one or more hardware processors configured to obtain a stack of medical images comprising at least a representation of the body chamber inside the patient; to obtain a region of interest using a convolutional network trained to locate the body chamber, wherein the region of interest corresponds to the body chamber from each of the medical images; and to infer a shape of the body chamber using a stacked auto-encoder (AE) network trained to delineate the body chamber, wherein the AE network segments the body chamber; (b) operating the system to detect the body chamber in the images using deep convolutional networks trained to locate the body chamber, to infer a shape of the body chamber using a stacked auto-encoder trained to delineate the body chamber, and to incorporate the inferred shape into a deformable model for segmentation; and (c) detectingType: GrantFiled: December 11, 2019Date of Patent: November 23, 2021Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Michael Rashidi Avendi, Hamid Jafarkhani, Arash Kheradvar
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Publication number: 20210312242Abstract: Methods, devices, and systems that are related to facilitating an automated, fast and accurate model for cardiac image segmentation, particularly for image data of children with complex congenital heart disease are disclosed. In one example aspect, a generative adversarial network is disclosed. The generative adversarial network includes a generator configured to generate synthetic imaging samples associated with a cardiovascular system, and a discriminator configured to receive the synthetic imaging samples from the generator and determine probabilities indicating likelihood of the synthetic imaging samples corresponding to real cardiovascular imaging sample. The discriminator is further configured to provide the probabilities determined by the discriminator to the generator and the discriminator to allow the parameters of the generator and the parameters of the discriminator to be adjusted iteratively until an equilibrium between the generator and the discriminator is established.Type: ApplicationFiled: March 26, 2021Publication date: October 7, 2021Inventors: Hamid Jafarkhani, Saeed Karimi-Bidhendi, Arash Kheradvar
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Patent number: 10992353Abstract: Communication systems and methods in accordance with various embodiments of the invention utilize modulation on zeros. Carrier frequency offsets (CFO) can result in an unknown rotation of all zeros of a received signal's z-transform. Therefore, a binary MOCZ scheme (BMOCZ) can be utilized in which the modulated binary data is encoded using a cycling register code (e.g. CPC or ACPC), enabling receivers to determine cyclic shifts in the BMOCZ symbol resulting from a CFO. Receivers in accordance with several embodiments of the invention include decoders capable of decoding information bits from received discrete-time baseband signals by: estimating a timing offset for the received signal; determining a plurality of zeros of a z-transform of the received symbol; identifying zeros from the plurality of zeros that encode received bits by correcting fractional rotations resulting from the CFO; and decoding information bits based upon the received bits using a cycling register code.Type: GrantFiled: September 4, 2020Date of Patent: April 27, 2021Assignees: California Institute of Technology, The Regents of the University of California, Technische Universität BerlinInventors: Philipp Walk, Babak Hassibi, Peter Jung, Hamid Jafarkhani
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Publication number: 20210012885Abstract: Devices, systems and methods related to techniques for performing four-chamber segmentation of echocardiograms are disclosed. In one example aspect, a method for generating segmented image data based on an input echocardiogram includes receiving an input echocardiogram that includes information associated with four chambers of a heart, performing segmentation on the information associated with the four chambers using an adversarial model that comprises a first artificial neural network with multiple layers, and combining data from selected layers of the first artificial neural network to generate an output image that includes the segmented four chambers of the heart.Type: ApplicationFiled: July 10, 2020Publication date: January 14, 2021Inventors: Arghavan Arafati, Hamid Jafarkhani, Arash Kheradvar
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Publication number: 20200403664Abstract: Communication systems and methods in accordance with various embodiments of the invention utilize modulation on zeros. Carrier frequency offsets (CFO) can result in an unknown rotation of all zeros of a received signal's z-transform. Therefore, a binary MOCZ scheme (BMOCZ) can be utilized in which the modulated binary data is encoded using a cycling register code (e.g. CPC or ACPC), enabling receivers to determine cyclic shifts in the BMOCZ symbol resulting from a CFO. Receivers in accordance with several embodiments of the invention include decoders capable of decoding information bits from received discrete-time baseband signals by: estimating a timing offset for the received signal; determining a plurality of zeros of a z-transform of the received symbol; identifying zeros from the plurality of zeros that encode received bits by correcting fractional rotations resulting from the CFO; and decoding information bits based upon the received bits using a cycling register code.Type: ApplicationFiled: September 4, 2020Publication date: December 24, 2020Applicants: California Institute of Technology, The Regents of the University of California, Technische Universität BerlinInventors: Philipp Walk, Babak Hassibi, Peter Jung, Hamid Jafarkhani
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Publication number: 20200382141Abstract: Methods and devices are provided for error correction of distributed data in distributed systems using Reed-Solomon codes. In one embodiment, processes are provided for error correction that include receiving a first correction code for data fragments stored in storage nodes, constructing a second correction code responsive to an unavailable storage node of the storage nodes, performing erasure repair of the unavailable storage node, and outputting a corrected data fragment. The first correction code is a Reed-Solomon code represented as a polynomial and the second correction code is represented as a second polynomial with an increased subpacketization size. Processes are configured to account for repair bandwidth and sub-packetization size. Code constructions and repair schemes accommodate different sizes of evaluation points and provide a flexible tradeoff between the subpacketization size repair bandwidth of codes.Type: ApplicationFiled: May 29, 2020Publication date: December 3, 2020Applicant: The Regents of the University of CaliforniaInventors: Zhiying WANG, Weiqi LI, Hamid JAFARKHANI
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Patent number: 10804982Abstract: Communication systems and methods in accordance with various embodiments of the invention utilize modulation on zeros. Carrier frequency offsets (CFO) can result in an unknown rotation of all zeros of a received signal's z-transform. Therefore, a binary MOCZ scheme (BMOCZ) can be utilized in which the modulated binary data is encoded using a cycling register code (e.g. CPC or ACPC), enabling receivers to determine cyclic shifts in the BMOCZ symbol resulting from a CFO. Receivers in accordance with several embodiments of the invention include decoders capable of decoding information bits from received discrete-time baseband signals by: estimating a timing offset for the received signal; determining a plurality of zeros of a z-transform of the received symbol; identifying zeros from the plurality of zeros that encode received bits by correcting fractional rotations resulting from the CFO; and decoding information bits based upon the received bits using a cycling register code.Type: GrantFiled: February 7, 2020Date of Patent: October 13, 2020Assignees: California Institute of Technology, The Regents of the University of California, Technische Universität BerlinInventors: Philipp Walk, Babak Hassibi, Peter Jung, Hamid Jafarkhani
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Publication number: 20200259534Abstract: Communication systems and methods in accordance with various embodiments of the invention utilize modulation on zeros. Carrier frequency offsets (CFO) can result in an unknown rotation of all zeros of a received signal's z-transform. Therefore, a binary MOCZ scheme (BMOCZ) can be utilized in which the modulated binary data is encoded using a cycling register code (e.g. CPC or ACPC), enabling receivers to determine cyclic shifts in the BMOCZ symbol resulting from a CFO. Receivers in accordance with several embodiments of the invention include decoders capable of decoding information bits from received discrete-time baseband signals by: estimating a timing offset for the received signal; determining a plurality of zeros of a z-transform of the received symbol; identifying zeros from the plurality of zeros that encode received bits by correcting fractional rotations resulting from the CFO; and decoding information bits based upon the received bits using a cycling register code.Type: ApplicationFiled: February 7, 2020Publication date: August 13, 2020Applicants: California Institute of Technology, The Regents of the University of California, Technische Universität BerlinInventors: Philipp Walk, Babak Hassibi, Peter Jung, Hamid Jafarkhani