Patents Assigned to Coherent Technologies
  • Patent number: 10693692
    Abstract: Wireless communication techniques for transmitting and receiving reference signals is described. The reference signals may include pilot signals that are transmitted using transmission resources that are separate from data transmission resources. Pilot signals are continuously transmitted from a base station to user equipment being served. Pilot signals are generated from delay-Doppler domain signals that are processed to obtain time-frequency signals that occupy a two-dimensional lattice in the time frequency domain that is non-overlapping with a lattice corresponding to data signal transmissions.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: June 23, 2020
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Shlomo Selim Rakib, Anthony Ekpenyong, Clayton Ambrose, Shachar Kons
  • Patent number: 10681568
    Abstract: Fiber, cable, and wireless data channels are typically impaired by reflectors and other imperfections, producing a channel state with echoes and frequency shifts in data waveforms. Here, methods of using pilot symbol waveform bursts to automatically produce a detailed 2D model of the channel state are presented. This 2D channel state can then be used to optimize data transmission. For wireless data channels, an even more detailed 2D model of channel state can be produced by using polarization and multiple antennas in the process. Once 2D channel states are known, the system turns imperfect data channels from a liability to an advantage by using channel imperfections to boost data transmission rates. The methods can be used to improve legacy data transmission modes in multiple types of media, and are particularly useful for producing new types of robust and high capacity wireless communications using non-legacy data transmission methods as well.
    Type: Grant
    Filed: July 21, 2018
    Date of Patent: June 9, 2020
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Shlomo Selim Rakib
  • Patent number: 10673659
    Abstract: An iterative two dimension equalizer usable in a receiver of orthogonal time frequency space (OTFS) modulated signals is described. In one configuration of the equalizer, a forward path generates, from received time-frequency domain samples and a channel estimate, estimates of data bits and likelihood numbers associated with the estimates of data bits, generated by delay-Doppler domain processing. In the feedback direction, the estimates of data bits are used to generate symbol estimates and autocorrelation matrix estimate in the time domain. In another configuration, a soft symbol mapper is used in the feedback direction for directly generating the feedback input symbol estimate without having to generate estimates of data bits.
    Type: Grant
    Filed: July 15, 2019
    Date of Patent: June 2, 2020
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Shachar Kons
  • Patent number: 10666479
    Abstract: A wireless communication method includes generating a pilot signal that is represented using a complex exponential signal having a first linear phase in a time dimension and a second linear phase in a frequency dimension; and transmitting the pilot signal over a wireless communication channel using transmission resources that are designated for pilot signal transmission in a legacy transmission network such as a Long Term Evolution (LTE) network.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: May 26, 2020
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Shlomo Selim Rakib, Anton Monk, Michail Tsatsanis, Yoav Hebron
  • Patent number: 10667148
    Abstract: Computerized wireless transmitter/receiver system that automatically uses combinations of various methods, including transmitting data symbols by weighing or modulating a family of time shifted and frequency shifted waveforms bursts, pilot symbol methods, error detection methods, MIMO methods, and other methods, to automatically determine the structure of a data channel, and automatically compensate for signal distortions caused by various structural aspects of the data channel, as well as changes in channel structure. Often the data channel is a two or three dimensional space in which various wireless transmitters, receivers and signal reflectors are moving. The invention's modulation methods detect locations and speeds of various reflectors and other channel impairments. Error detection schemes, variation of modulation methods, and MIMO techniques further detect and compensate for impairments.
    Type: Grant
    Filed: July 21, 2018
    Date of Patent: May 26, 2020
    Assignee: Cohere Technologies, Inc.
    Inventors: Shlomo Selim Rakib, Ronny Hadani
  • Patent number: 10666314
    Abstract: In a wireless communication network, pilot signals are transmitted over a wireless communication channel by determining a maximum delay spread for a transmission channel, determining a maximum Doppler frequency spread for the transmission channel, and allocating a set of transmission resources in a time-frequency domain to a number of pilot signals based on the maximum delay spread and the maximum Doppler frequency spread.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: May 26, 2020
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Shlomo Selim Rakib, Anton Monk, Michail Tsatsanis, Yoav Hebron
  • Publication number: 20200153107
    Abstract: An antenna system that includes a lens portion having a radiation-side curved surface and a feed-side reception surface, the lens portion structured to focus radio frequency radiations entering from the radiation-side curved surface on a focal point located at the feed reception surface and one or more antenna elements at or near the focal point, the one or more antenna elements being separated from each other by a fractional multiple of a center wavelength of a frequency band of operation, and each antenna element communicatively coupled to one or more radio frequency transmit and/or receive chain and being able to transmit and/or receive data from the radio frequency transmit chain according to a transmission scheme.
    Type: Application
    Filed: October 22, 2019
    Publication date: May 14, 2020
    Applicant: Cohere Technologies, Inc.
    Inventor: Shlomo Rakib
  • Publication number: 20200145273
    Abstract: A system and method for orthogonal time frequency space communication and waveform generation. The method includes receiving a plurality of information symbols and encoding an N×M array containing the plurality of information symbols into a two-dimensional array of modulation symbols by spreading each of the plurality of information symbols with respect to both time and frequency. The two-dimensional array of modulation symbols is then transmitted using M mutually orthogonal waveforms included within M frequency sub-bands.
    Type: Application
    Filed: September 3, 2019
    Publication date: May 7, 2020
    Applicant: Cohere Technologies, Inc.
    Inventors: Shlomo Selim Rakib, Ronny Hadani
  • Patent number: 10578494
    Abstract: An apparatus includes a photonic integrated circuit (PIC) to measure an optical wavelength of a light source. The PIC includes an optical splitter, a plurality of tunable interferometers and one or more detectors. The optical splitter is coupled to the light source, and the interferometers are coupled to the optical splitter. Each interferometer receives a portion of an optical signal of the light source. One or more detectors are coupled to each interferometer, and the interferometers have different free spectral ranges (FSRs). A largest FSR value of the different FSRs is greater than an entire intended wavelength measurement range of the PIC.
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: March 3, 2020
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventors: Bruce Gregory Tiemann, Paul Johan Mikael Suni
  • Patent number: 10567125
    Abstract: A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data matrix is provided by permuting elements of the intermediate data frame. A modulated signal is generated in accordance with elements of the transformed data matrix.
    Type: Grant
    Filed: July 24, 2018
    Date of Patent: February 18, 2020
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Shlomo Selim Rakib
  • Patent number: 10568143
    Abstract: Methods, devices and systems for generating physical random access channel sequences that can be used to efficiently access a wireless network are disclosed. One exemplary method of accessing a wireless network includes generating a repeated orthogonal sequence by repeating a base orthogonal sequence, generating a random access sequence by applying a window function to the repeated orthogonal sequence, and accessing the wireless network using a random access procedure by selectively using the random access sequence. In an example, the base orthogonal sequence may be a Zadoff-Chu sequence. In another example, the window function may be a root-Hamming window.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: February 18, 2020
    Assignee: Cohere Technologies, Inc.
    Inventors: James Delfeld, Ronny Hadani, Konstantinos Dimou
  • Patent number: 10555281
    Abstract: A wireless telecommunications system that mitigates infrasymbol interference due to Doppler-shift and multipath. Embodiments of the present invention are particularly advantageous for wireless telecommunications systems that operate in high-mobility environments, including high-speed trains and airplanes.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: February 4, 2020
    Assignee: Cohere Technologies, Inc.
    Inventors: Ron Hadani, Shlomo Rakib
  • Patent number: 10541734
    Abstract: A method for signal transmission using precoded symbol information involves estimating a two-dimensional model of a communication channel in a delay-Doppler domain. A perturbation vector is determined in a delay-time domain wherein the delay-time domain is related to the delay-Doppler domain by an FFT operation. User symbols are modified based upon the perturbation vector so as to produce perturbed user symbols. A set of Tomlinson-Harashima precoders corresponding to a set of fixed times in the delay-time domain may then be determined using a delay-time model of the communication channel. Precoded user symbols are generated by applying the Tomlinson-Harashima precoders to the perturbed user symbols. A modulated signal is then generated based upon the precoded user symbols and provided for transmission over the communication channel.
    Type: Grant
    Filed: July 24, 2018
    Date of Patent: January 21, 2020
    Assignee: Cohere Technologies, Inc.
    Inventors: Jim Delfeld, Shlomo Selim Rakib
  • Patent number: 10437084
    Abstract: An electro-optical crystal-mounted apparatus includes a compactly configured mounting sub-assembly, and a compactly configured position adjustment sub-assembly onto which the mounting sub-assembly is mounted. The mounting sub-assembly includes a mount including a thermally conductive and electrically insulating material, an electro-optical crystal housed within a cavity of the mount, and a layer of electrically conductive material disposed on at least a portion of the mount. The mounting sub-assembly further includes a crystal sub-assembly oven mounted to, and at least partially enclosing the mount, and a heater thermally coupled to the crystal sub-assembly oven. An electrical wire electrically is coupled to the layer of electrically conductive material.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: October 8, 2019
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventor: David Hwang
  • Patent number: 10404514
    Abstract: A system and method for orthogonal time frequency space communication and waveform generation. The method includes receiving a plurality of information symbols and encoding an N×M array containing the plurality of information symbols into a two-dimensional array of modulation symbols by spreading each of the plurality of information symbols with respect to both time and frequency. The two-dimensional array of modulation symbols is then transmitted using M mutually orthogonal waveforms included within M frequency sub-bands.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: September 3, 2019
    Assignee: Cohere Technologies, Inc.
    Inventors: Shlomo Selim Rakib, Ronny Hadani
  • Patent number: 10394042
    Abstract: An apparatus includes a source configured to generate a beam of electromagnetic radiation propagating in a first direction and a spatial filter. The spatial filter is configured to restrict the beam of electromagnetic radiation in one or more dimensions and includes at least one set of rods including a first rod and a second rod. The first rod is a first cylindrical structure with a first axis in a first plane and the second rod is a second cylindrical structure with a second axis in a second plane parallel to the first plane. The first axis and the second axis are longitudinal axes, and the first and the second rods have shaped surfaces in portions of their respective surfaces facing one another.
    Type: Grant
    Filed: January 18, 2017
    Date of Patent: August 27, 2019
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventors: Bruce Gregory Tiemann, Glenn T. Bennett, Joel Richard Blum
  • Patent number: 10355887
    Abstract: An iterative two dimension equalizer usable in a receiver of orthogonal time frequency space (OTFS) modulated signals is described. In one configuration of the equalizer, a forward path generates, from received time-frequency domain samples and a channel estimate, estimates of data bits and likelihood numbers associated with the estimates of data bits, generated by delay-Doppler domain processing. In the feedback direction, the estimates of data bits are used to generate symbol estimates and autocorrelation matrix estimate in the time domain. In another configuration, a soft symbol mapper is used in the feedback direction for directly generating the feedback input symbol estimate without having to generate estimates of data bits.
    Type: Grant
    Filed: October 1, 2018
    Date of Patent: July 16, 2019
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Shachar Kons
  • Patent number: 10356632
    Abstract: An antenna system includes an antenna lens, and one or more antenna feeds placed at an on or off-focal point of the antenna lens. Each of the one or more antenna feeds comprises one or more antenna feed elements that are electrically independently operable. The antenna system also includes an antenna feed network electrically coupled with the one or more antenna feed elements via signal paths.
    Type: Grant
    Filed: January 27, 2018
    Date of Patent: July 16, 2019
    Assignee: Cohere Technologies, Inc.
    Inventor: Robert Fanfelle
  • Patent number: 10334457
    Abstract: Fiber, cable, and wireless data channels are typically impaired by reflectors and other imperfections, producing a channel state with echoes and frequency shifts in data waveforms. Here, methods of using OTFS pilot symbol waveform bursts to automatically produce a detailed 2D model of the channel state are presented. This 2D channel state can then be used to optimize data transmission. For wireless data channels, an even more detailed 2D model of channel state can be produced by using polarization and multiple antennas in the process. Once 2D channel states are known, the system turns imperfect data channels from a liability to an advantage by using channel imperfections to boost data transmission rates. The methods can be used to improve legacy data transmission modes in multiple types of media, and are particularly useful for producing new types of robust and high capacity wireless communications using non-legacy OTFS data transmission methods.
    Type: Grant
    Filed: January 4, 2018
    Date of Patent: June 25, 2019
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Shlomo Selim Rakib
  • Patent number: 10290114
    Abstract: An imaging system includes an imaging platform that has a first aperture and a second aperture that are separated by a separation distance in a predefined direction. The imaging system includes a transmitter device coupled to the first aperture that transmits an optical signal via the first aperture in a first direction perpendicular to the predefined direction. A first receiver of the imaging system receives, via the first aperture, a first reflected signal in the first direction from a target object at a range distance. A second receiver of the imaging system receives, via the second aperture, a second reflected signal in the first direction from the target object. A processor unit of the imaging system determines a phase difference between the first and second reflected signals. The processor unit also determines an estimate of a height of the target object based on the phase difference and the range distance.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: May 14, 2019
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventor: Joseph Robert Buck, Jr.