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公开(公告)号：US11228323B2
公开(公告)日：2022-01-18
申请号：US16887804
申请日：2020-05-29
Applicant: The Regents of the University of California
Inventor： Zhiying Wang , Weiqi Li , Hamid Jafarkhani
Abstract: 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. In addition, schemes are provided to manage a single node failure and multiple node failures.
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12.发明授权公开(公告)号：US11182896B2
公开(公告)日：2021-11-23
申请号：US16711129
申请日：2019-12-11
Applicant: The Regents of the University of California
Inventor： Michael Rashidi Avendi , Hamid Jafarkhani , Arash Kheradvar
Abstract: 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) detecting whether or not the body chamber has an abnormal structure, wherein an abnormal structure is indicated by a body chamber clinical indicia that is different from a corresponding known standard clinical indicia for the body chamber.
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公开(公告)号：US20170346541A1
公开(公告)日：2017-11-30
申请号：US15604102
申请日：2017-05-24
Applicant: The Regents of the University of California
Inventor： Hamid Jafarkhani , Erdem Koyuncu
IPC: H04B7/06 , H04B7/0417
CPC classification number: H04B7/0626 , H04B7/0417 , H04B7/061 , H04B7/0684
Abstract: A method includes the step of interleaving training and feedback stages in a transmitter and a multiplicity of antennas, wherein the transmitter trains the corresponding ones of the multiplicity of antennas one by one and receives feedback information after training each one of the corresponding ones of the multiplicity of antennas. An apparatus operating using the method includes a multiple-input single-output system with t transmitter antennas, a short-term power constraint P, and target data rate ρ where for any t, the same outage probability as a system with perfect transmitter and receiver channel state information is achieved with a feedback rate of R1 bits per channel state and via training R2 transmitter antennas on average, where R1 and R2 are independent of t, and depend only on ρ and P.
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14.发明授权公开(公告)号：US11799704B2
公开(公告)日：2023-10-24
申请号：US17662213
申请日：2022-05-05
Applicant: California Institute of Technology , The Regents of the University of California , Technische Universität Berlin
Inventor： Philipp Walk , Babak Hassibi , Peter Jung , Hamid Jafarkhani
IPC: H04L27/26 , H04B7/0452 , H04L7/04 , H04B1/04 , H04L27/12
CPC classification number: H04L27/2602 , H04B1/0475 , H04B7/0452 , H04L7/042 , H04L7/048 , H04L27/122
Abstract: 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.
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15.发明授权公开(公告)号：US11765008B2
公开(公告)日：2023-09-19
申请号：US17662213
申请日：2022-05-05
Applicant: California Institute of Technology , The Regents of the University of California , Technische Universität Berlin
Inventor： Philipp Walk , Babak Hassibi , Peter Jung , Hamid Jafarkhani
IPC: H04L27/26 , H04B7/0452 , H04L7/04 , H04B1/04 , H04L27/12
CPC classification number: H04L27/2602 , H04B1/0475 , H04B7/0452 , H04L7/042 , H04L7/048 , H04L27/122
Abstract: 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.
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Patent Agency Ranking
16.发明授权公开(公告)号：US11368196B2
公开(公告)日：2022-06-21
申请号：US17204762
申请日：2021-03-17
Applicant: California Institute of Technology , The Regents of the University of California , Technische Universität Berlin
Inventor： Philipp Walk , Babak Hassibi , Peter Jung , Hamid Jafarkhani
IPC: H04B7/0452 , H04L7/04 , H04B1/04 , H04L27/12
Abstract: 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.
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公开(公告)号：US20210012885A1
公开(公告)日：2021-01-14
申请号：US16926517
申请日：2020-07-10
Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
Inventor： Arghavan Arafati , Hamid Jafarkhani , Arash Kheradvar
Abstract: 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.
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18.发明授权公开(公告)号：US10804982B2
公开(公告)日：2020-10-13
申请号：US16785279
申请日：2020-02-07
Applicant: California Institute of Technology , The Regents of the University of California , Technische Universität Berlin
Inventor： Philipp Walk , Babak Hassibi , Peter Jung , Hamid Jafarkhani
Abstract: 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.
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公开(公告)号：US10187088B2
公开(公告)日：2019-01-22
申请号：US14689870
申请日：2015-04-17
Applicant: The Regents of the University of California
Inventor： Hamid Jafarkhani , Mahdi Hajiaghayi
Abstract: An apparatus or method for minimizing the total accessing cost, such as minimizing repair bandwidth, delay or the number of hops including the steps of minimizing the number of nodes to be engaged for the recovery process using a polynomial-time solution that determines the optimal number of participating nodes and the optimal set of nodes to be engaged for recovering lost data, where in a distributed database storage system, for example a dynamic system, where the accessing cost or even the number of available nodes are subject to change results in different values for the optimal number of participating nodes. An MDS code is included which can be reused when the number of participating nodes varies without having to change the entire code structure and the content of the nodes.
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20.发明申请公开(公告)号：US20170109881A1
公开(公告)日：2017-04-20
申请号：US15294207
申请日：2016-10-14
Applicant: The Regents of the University of California
Inventor： Michael Rashidi Avendi , Hamid Jafarkhani , Arash Kheradvar
Abstract: Systems and methods are disclosed for automatically segmenting a heart chamber from medical images of a patient. The system may include one or more hardware processors configured to: obtain image data including at least a representation of the patient's heart; obtain a region of interest from the image data; organize the region of interest into an input vector; apply the input vector through a trained graph; obtain an output vector representing a refined region of interest corresponding to the heart based on the application of the input vector through the trained graph; apply a deformable model on the obtained output vector representing the refined region of interest; and identify a segment of a heart chamber from the application of the deformable model on the obtained output vector.
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