Patents by Inventor Dariush Divsalar
Dariush Divsalar 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: 20240154626Abstract: Neural Normalized MinSum (N-NMS) decoding for improving frame error rate (FER) performance on linear block codes over conventional normalized MinSum (NMS). Dynamic multiplicative weights are assigned to each check-to-variable message in each iteration to efficiently provide training parameters of N-NMS that support N-NMS for longer block lengths. Embodiment are described for neural two-dimensional normalized MinSum (N-2D-NMS) decoders requiring fewer training parameters. The N-2D-NMS approaches for example use the same weight for edges with the same check and/or variable node degree. Simulation results indicate that that this LDPC decoding performs similarly to previous techniques while substantially reducing the amount of training necessary.Type: ApplicationFiled: August 30, 2023Publication date: May 9, 2024Applicants: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, CALIFORNIA INSTITUTE OF TECHNOLOGYInventors: Richard D. Wesel, Linfang Wang, Sean Chen, Dariush Divsalar, Jonathan Nguyen
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Publication number: 20230327774Abstract: Methods and devices implementing a combination of multi-dimensional pulse position modulation (PPM) with wavelength division multiplexing (WDM) or wavelength division multiplexing multiple access (WDMA) for long range space communications are disclosed. The described multi-dimensional PPM scheme can use the laser wavelength and/or polarization as the additional dimension(s) to the time dimension. Through examples it is shown that the disclosed teachings result in a higher photon information efficiency. Various exemplary embodiments are also presented to highlight the applications benefiting from the disclosed methods and devices.Type: ApplicationFiled: May 26, 2023Publication date: October 12, 2023Inventors: Dariush Divsalar, William H. Farr, Makan Mohageg, Samuel J. Dolinar, Matthew D. Thill
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Patent number: 11728896Abstract: Methods and devices implementing a combination of multi-dimensional pulse position modulation (PPM) with wavelength division multiplexing (WDM) or wavelength division multiplexing multiple access (WDMA) for long range space communications are disclosed. The described multi-dimensional PPM scheme can use the laser wavelength and/or polarization as the additional dimension(s) to the time dimension. Through examples it is shown that the disclosed teachings result in a higher photon information efficiency. Various exemplary embodiments are also presented to highlight the applications benefiting from the disclosed methods and devices.Type: GrantFiled: November 18, 2021Date of Patent: August 15, 2023Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGYInventors: Dariush Divsalar, William H Farr, Makan Mohageg, Samuel J Dolinar, Matthew D Thill
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Publication number: 20220158739Abstract: Methods and devices implementing a combination of multi-dimensional pulse position modulation (PPM) with wavelength division multiplexing (WDM) or wavelength division multiplexing multiple access (WDMA) for long range space communications are disclosed. The described multi-dimensional PPM scheme can use the laser wavelength and/or polarization as the additional dimension(s) to the time dimension. Through examples it is shown that the disclosed teachings result in a higher photon information efficiency. Various exemplary embodiments are also presented to highlight the applications benefiting from the disclosed methods and devices.Type: ApplicationFiled: November 18, 2021Publication date: May 19, 2022Inventors: Dariush Divsalar, William H Farr, Makan Mohageg, Samuel J Dolinar, Matthew D Thill
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Patent number: 10374759Abstract: A high throughput communication apparatus which provides low frame error rates (FER). Error checking encoder and decoders which each comprise a plurality of short blocklength error checking encoders or decoders, respectively, in parallel, coupled through common incremental redundancy. Short-blocklength codes are utilized to achieve communication capacity with incremental redundancy. The system can transmit and decode a large number of short-blocklength codewords in parallel, while it delivers incremental redundancy, without feedback, only to the decoders that need incremental redundancy.Type: GrantFiled: May 13, 2018Date of Patent: August 6, 2019Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Richard Wesel, Kasra Vakilinia, Sudarsan V S Ranganathan, Dariush Divsalar, Haobo Wang
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Publication number: 20190097847Abstract: Multiple symbol noncoherent soft output detectors in accordance with embodiments of the invention are disclosed. In a number of embodiments, the multiple symbol noncoherent soft output detector uses soft metrics based on the Log Likelihood Ratio (LLR) of each symbol to provide information concerning the reliability of each detected symbol. One embodiment of the invention includes a receiver configured to receive and sample a phase modulated input signal, and a multiple symbol noncoherent soft output detector configured to receive the sampled input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols.Type: ApplicationFiled: May 25, 2018Publication date: March 28, 2019Applicant: Mojix, Inc.Inventors: Dariush Divsalar, Ramin Sadr
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Publication number: 20180375609Abstract: Systems and methods for detecting collisions in radio frequency tags in accordance with embodiments of the invention are disclosed. In one embodiment, a receiver system includes a receiver configured to receive and sample a phase modulated input signal, and a multiple symbol noncoherent soft output detector configured to receive the sampled input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols, a collision detector configured to calculate a decision metric from a set of soft metrics generated by the multiple symbol noncoherent soft output detector and detect a collision when the decision metric satisfies a predetermined criterion.Type: ApplicationFiled: February 20, 2018Publication date: December 27, 2018Applicant: Mojix, Inc.Inventors: Ramin Sadr, Dariush Divsalar
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Publication number: 20180323914Abstract: A high throughput communication apparatus which provides low frame error rates (FER). Error checking encoder and decoders which each comprise a plurality of short blocklength error checking encoders or decoders, respectively, in parallel, coupled through common incremental redundancy. Short-blocklength codes are utilized to achieve communication capacity with incremental redundancy. The system can transmit and decode a large number of short-blocklength codewords in parallel, while it delivers incremental redundancy, without feedback, only to the decoders that need incremental redundancy.Type: ApplicationFiled: May 13, 2018Publication date: November 8, 2018Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Richard Wesel, Kasra Vakilinia, Sudarsan V S Ranganathan, Dariush Divsalar, Haobo Wang
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Patent number: 10009196Abstract: Multiple symbol noncoherent soft output detectors in accordance with embodiments of the invention are disclosed. In a number of embodiments, the multiple symbol noncoherent soft output detector uses soft metrics based on the Log Likelihood Ratio (LLR) of each symbol to provide information concerning the reliability of each detected symbol. One embodiment of the invention includes a receiver configured to receive and sample a phase modulated input signal, and a multiple symbol noncoherent soft output detector configured to receive the sampled input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols.Type: GrantFiled: March 15, 2017Date of Patent: June 26, 2018Assignee: Mojix, Inc.Inventors: Dariush Divsalar, Ramin Sadr
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Patent number: 9998260Abstract: A high throughput communication apparatus which provides low frame error rates (FER). Error checking encoder and decoders which each comprise a plurality of short blocklength error checking encoders or decoders, respectively, in parallel, coupled through common incremental redundancy. Short-blocklength codes are utilized to achieve communication capacity with incremental redundancy. The system can transmit and decode a large number of short-blocklength codewords in parallel, while it delivers incremental redundancy, without feedback, only to the decoders that need incremental redundancy.Type: GrantFiled: February 10, 2017Date of Patent: June 12, 2018Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Richard Wesel, Kasra Vakilinia, Sudarsan V S Ranganathan, Dariush Divsalar
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Publication number: 20170366300Abstract: Systems and methods for detecting collisions in radio frequency tags in accordance with embodiments of the invention are disclosed. In one embodiment, a receiver system includes a receiver configured to receive and sample a phase modulated input signal, and a multiple symbol noncoherent soft output detector configured to receive the sampled input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols, a collision detector configured to calculate a decision metric from a set of soft metrics generated by the multiple symbol noncoherent soft output detector and detect a collision when the decision metric satisfies a predetermined criterion.Type: ApplicationFiled: March 31, 2017Publication date: December 21, 2017Applicant: Mojix, Inc.Inventors: Ramin Sadr, Dariush Divsalar
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Publication number: 20170353334Abstract: Multiple symbol noncoherent soft output detectors in accordance with embodiments of the invention are disclosed. In a number of embodiments, the multiple symbol noncoherent soft output detector uses soft metrics based on the Log Likelihood Ratio (LLR) of each symbol to provide information concerning the reliability of each detected symbol. One embodiment of the invention includes a receiver configured to receive and sample a phase modulated input signal, and a multiple symbol noncoherent soft output detector configured to receive the sampled input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols.Type: ApplicationFiled: March 15, 2017Publication date: December 7, 2017Applicant: Mojix, Inc.Inventors: Dariush Divsalar, Ramin Sadr
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Publication number: 20170237530Abstract: A high throughput communication apparatus which provides low frame error rates (FER). Error checking encoder and decoders which each comprise a plurality of short blocklength error checking encoders or decoders, respectively, in parallel, coupled through common incremental redundancy. Short-blocklength codes are utilized to achieve communication capacity with incremental redundancy. The system can transmit and decode a large number of short-blocklength codewords in parallel, while it delivers incremental redundancy, without feedback, only to the decoders that need incremental redundancy.Type: ApplicationFiled: February 10, 2017Publication date: August 17, 2017Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Richard Wesel, Kasra Vakilinia, Sudarsan V S Ranganathan, Dariush Divsalar
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Patent number: 9647797Abstract: Systems and methods for detecting collisions in radio frequency tags in accordance with embodiments of the invention are disclosed. In one embodiment, a receiver system includes a receiver configured to receive and sample a phase modulated input signal, and a multiple symbol noncoherent soft output detector configured to receive the sampled input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols, a collision detector configured to calculate a decision metric from a set of soft metrics generated by the multiple symbol noncoherent soft output detector and detect a collision when the decision metric satisfies a predetermined criterion.Type: GrantFiled: March 3, 2016Date of Patent: May 9, 2017Assignee: Mojix, Inc.Inventors: Ramin Sadr, Dariush Divsalar
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Patent number: 9602316Abstract: Multiple symbol noncoherent soft output detectors in accordance with embodiments of the invention are disclosed. In a number of embodiments, the multiple symbol noncoherent soft output detector uses soft metrics based on the Log Likelihood Ratio (LLR) of each symbol to provide information concerning the reliability of each detected symbol. One embodiment of the invention includes a receiver configured to receive and sample a phase modulated input signal, and a multiple symbol noncoherent soft output detector configured to receive the sampled input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols.Type: GrantFiled: March 7, 2012Date of Patent: March 21, 2017Assignee: Mojix, Inc.Inventors: Dariush Divsalar, Ramin Sadr
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Publication number: 20160191206Abstract: Systems and methods for detecting collisions in radio frequency tags in accordance with embodiments of the invention are disclosed. In one embodiment, a receiver system includes a receiver configured to receive and sample a phase modulated input signal, and a multiple symbol noncoherent soft output detector configured to receive the sampled input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols, a collision detector configured to calculate a decision metric from a set of soft metrics generated by the multiple symbol noncoherent soft output detector and detect a collision when the decision metric satisfies a predetermined criterion.Type: ApplicationFiled: March 3, 2016Publication date: June 30, 2016Applicant: Mojix, Inc.Inventors: Ramin Sadr, Dariush Divsalar
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Patent number: 9312987Abstract: Systems and methods for detecting collisions in radio frequency tags in accordance with embodiments of the invention are disclosed. In one embodiment, a receiver system includes a receiver configured to receive and sample a phase modulated input signal, and a multiple symbol noncoherent soft output detector configured to receive the sampled input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols, a collision detector configured to calculate a decision metric from a set of soft metrics generated by the multiple symbol noncoherent soft output detector and detect a collision when the decision metric satisfies a predetermined criterion.Type: GrantFiled: April 8, 2015Date of Patent: April 12, 2016Assignee: Mojix, Inc.Inventors: Ramin Sadr, Dariush Divsalar
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Publication number: 20150215073Abstract: Systems and methods for detecting collisions in radio frequency tags in accordance with embodiments of the invention are disclosed. In one embodiment, a receiver system includes a receiver configured to receive and sample a phase modulated input signal, and a multiple symbol noncoherent soft output detector configured to receive the sampled input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols, a collision detector configured to calculate a decision metric from a set of soft metrics generated by the multiple symbol noncoherent soft output detector and detect a collision when the decision metric satisfies a predetermined criterion.Type: ApplicationFiled: April 8, 2015Publication date: July 30, 2015Inventors: Ramin Sadr, Dariush Divsalar
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Patent number: 9008239Abstract: Systems and methods for detecting collisions in radio frequency tags in accordance with embodiments of the invention are disclosed. In one embodiment, a receiver system includes a receiver configured to receive and sample a phase modulated input signal, and a multiple symbol noncoherent soft output detector configured to receive the sampled input signal and to generate a soft metric indicative of the reliability of a detected symbol based upon observations over multiple symbols, a collision detector configured to calculate a decision metric from a set of soft metrics generated by the multiple symbol noncoherent soft output detector and detect a collision when the decision metric satisfies a predetermined criterion.Type: GrantFiled: March 15, 2013Date of Patent: April 14, 2015Assignee: Mojix, Inc.Inventors: Ramin Sadr, Dariush Divsalar
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Patent number: 8832520Abstract: Digital communication coding methods for designing protograph-based bit-interleaved code modulation that is general and applies to any modulation. The general coding framework can support not only multiple rates but also adaptive modulation. The method is a two stage lifting approach. In the first stage, an original protograph is lifted to a slightly larger intermediate protograph. The intermediate protograph is then lifted via a circulant matrix to the expected codeword length to form a protograph-based low-density parity-check code.Type: GrantFiled: November 29, 2011Date of Patent: September 9, 2014Assignees: California Institute of Technology, Board of Regents, The University of Texas SystemInventors: Thuy V. Nguyen, Aria Nosratinia, Dariush Divsalar