Patents Assigned to Coherent Technologies
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Patent number: 10693692Abstract: 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: GrantFiled: March 23, 2017Date of Patent: June 23, 2020Assignee: Cohere Technologies, Inc.Inventors: Ronny Hadani, Shlomo Selim Rakib, Anthony Ekpenyong, Clayton Ambrose, Shachar Kons
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Patent number: 10681568Abstract: 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: GrantFiled: July 21, 2018Date of Patent: June 9, 2020Assignee: Cohere Technologies, Inc.Inventors: Ronny Hadani, Shlomo Selim Rakib
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Patent number: 10673659Abstract: 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: GrantFiled: July 15, 2019Date of Patent: June 2, 2020Assignee: Cohere Technologies, Inc.Inventors: Ronny Hadani, Shachar Kons
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Patent number: 10666479Abstract: 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: GrantFiled: December 9, 2016Date of Patent: May 26, 2020Assignee: Cohere Technologies, Inc.Inventors: Ronny Hadani, Shlomo Selim Rakib, Anton Monk, Michail Tsatsanis, Yoav Hebron
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Patent number: 10667148Abstract: 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: GrantFiled: July 21, 2018Date of Patent: May 26, 2020Assignee: Cohere Technologies, Inc.Inventors: Shlomo Selim Rakib, Ronny Hadani
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Patent number: 10666314Abstract: 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: GrantFiled: February 24, 2017Date of Patent: May 26, 2020Assignee: Cohere Technologies, Inc.Inventors: Ronny Hadani, Shlomo Selim Rakib, Anton Monk, Michail Tsatsanis, Yoav Hebron
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Publication number: 20200153107Abstract: 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: ApplicationFiled: October 22, 2019Publication date: May 14, 2020Applicant: Cohere Technologies, Inc.Inventor: Shlomo Rakib
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Publication number: 20200145273Abstract: 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: ApplicationFiled: September 3, 2019Publication date: May 7, 2020Applicant: Cohere Technologies, Inc.Inventors: Shlomo Selim Rakib, Ronny Hadani
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Patent number: 10578494Abstract: 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: GrantFiled: February 9, 2018Date of Patent: March 3, 2020Assignee: Lockheed Martin Coherent Technologies, Inc.Inventors: Bruce Gregory Tiemann, Paul Johan Mikael Suni
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Patent number: 10567125Abstract: 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: GrantFiled: July 24, 2018Date of Patent: February 18, 2020Assignee: Cohere Technologies, Inc.Inventors: Ronny Hadani, Shlomo Selim Rakib
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Patent number: 10568143Abstract: 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: GrantFiled: March 27, 2018Date of Patent: February 18, 2020Assignee: Cohere Technologies, Inc.Inventors: James Delfeld, Ronny Hadani, Konstantinos Dimou
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Patent number: 10555281Abstract: 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: GrantFiled: March 31, 2017Date of Patent: February 4, 2020Assignee: Cohere Technologies, Inc.Inventors: Ron Hadani, Shlomo Rakib
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Patent number: 10541734Abstract: 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: GrantFiled: July 24, 2018Date of Patent: January 21, 2020Assignee: Cohere Technologies, Inc.Inventors: Jim Delfeld, Shlomo Selim Rakib
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Patent number: 10437084Abstract: 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: GrantFiled: May 23, 2017Date of Patent: October 8, 2019Assignee: Lockheed Martin Coherent Technologies, Inc.Inventor: David Hwang
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Patent number: 10404514Abstract: 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: GrantFiled: June 27, 2016Date of Patent: September 3, 2019Assignee: Cohere Technologies, Inc.Inventors: Shlomo Selim Rakib, Ronny Hadani
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Patent number: 10394042Abstract: 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: GrantFiled: January 18, 2017Date of Patent: August 27, 2019Assignee: Lockheed Martin Coherent Technologies, Inc.Inventors: Bruce Gregory Tiemann, Glenn T. Bennett, Joel Richard Blum
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Patent number: 10355887Abstract: 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: GrantFiled: October 1, 2018Date of Patent: July 16, 2019Assignee: Cohere Technologies, Inc.Inventors: Ronny Hadani, Shachar Kons
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Patent number: 10356632Abstract: 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: GrantFiled: January 27, 2018Date of Patent: July 16, 2019Assignee: Cohere Technologies, Inc.Inventor: Robert Fanfelle
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Patent number: 10334457Abstract: 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: GrantFiled: January 4, 2018Date of Patent: June 25, 2019Assignee: Cohere Technologies, Inc.Inventors: Ronny Hadani, Shlomo Selim Rakib
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Patent number: 10290114Abstract: 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: GrantFiled: March 7, 2018Date of Patent: May 14, 2019Assignee: Lockheed Martin Coherent Technologies, Inc.Inventor: Joseph Robert Buck, Jr.