Patents by Inventor Rabih Chrabieh
Rabih Chrabieh 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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Patent number: 11864130Abstract: A wireless communications method synchronously transmits periodically from synchronized base stations of a single frequency network a common downlink synchronization signal (IoT-PSS) that underlays broadcasted signals transmitted in licensed bands of a cellular system, and a system frame number least significant bits signal (IoT-SFN-LSB) indicating timing of transmission of a system information block signal (IoT-SIB) that contains information related to downlink and uplink transmission schedules and allocations. An IoT device receives the common downlink synchronization signal and transmits uplink data only after receiving the synchronization signal and system frame number signal.Type: GrantFiled: February 25, 2019Date of Patent: January 2, 2024Assignee: NextNav FranceInventor: Rabih Chrabieh
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Publication number: 20230081564Abstract: A method for estimating a time of arrival of a signal transmitted over a wireless channel, includes receiving the signal by a receiving device to produce a received signal; filtering by a filter either the received signal or a code sequence, wherein the filter is designed to produce a correlation output that is near causal; correlating the received signal with the code sequence to create the correlation output that is near causal; wherein near causal means that early side lobes and an early part of a main lobe of the correlation output are sufficiently suppressed in order to substantially reduce an impact of delayed multipath onto a first path component in the received signal, wherein the first path is in an operating region; identifying in the correlation output, an observation window associated with a main lobe in the correlation output; processing the observation window to determine a time of arrival of the first path component in the received signal.Type: ApplicationFiled: November 15, 2022Publication date: March 16, 2023Inventor: Rabih Chrabieh
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Patent number: 11522576Abstract: A method for estimating a time of arrival of a signal transmitted over a wireless channel, includes receiving the signal by a receiving device; correlating the received signal with a filtered code sequence to create a correlation output, identifying in the correlation output, an observation window associated with a main lobe in the correlation output; and processing the observation window to determine a time of arrival of a first path component in the received signal. The filtered code sequence is formed by incorporating a time of arrival matched filter (TOA-MF) inside predetermined shaped code sequence. The TOA-MF is matched to the predetermined shaped code sequence and is based upon a power delay profile of the wireless channel. The predetermined shaped code sequence is a convolution of a predetermined shaping sequence and a predetermined code sequence.Type: GrantFiled: November 19, 2020Date of Patent: December 6, 2022Assignee: Nestwave SASInventor: Rabih Chrabieh
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Publication number: 20220373638Abstract: A method for location determination in a wireless communications system solves a minimization problem using estimated time-of-arrivals (TOAs) of reference signals [108, 110, 112] received by a receiving node [100] from transmitting nodes [102, 104, 106] and predetermined locations of the transmitting nodes, to produce an estimate of unknown receiving node location and/or an estimate of an unknown time of transmission (t) of the reference signals. The minimization problem is defined in terms of a theoretical system model of time-of-arrivals (TOAs), linearized globally as a function of the unknown receiving node location, the unknown time of transmission (t) of the reference signals, and an additional intermediate variable (u) that defines a non-linear quadratic constraint over position coordinates of the unknown receiving node location and the time of transmission (t) of the reference signals, wherein the minimization problem optimizes the additional intermediate variable (u).Type: ApplicationFiled: October 28, 2020Publication date: November 24, 2022Inventors: Rabih Chrabieh, Mazen Neifer, Ines Ben Hamida, Ganda Ouedraogo
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Patent number: 11079467Abstract: A technique is provided for estimating time of arrival of a signal transmitted as a pulse and received as a sum of pulses. The received signal is filtered with a novel filter that lowers the early side lobes of the received signal to noise level. A first energy rise point is identified at a point of the main lobe of the filtered received signal, at which the energy is higher than the noise by a predetermined level. Starting from the identification of the first energy rise points, the time of arrival is estimated via curve matching, in which the shape of the filtered received signal is matched to the shape of a reference curve composed by a sum of one or more reference curves that are shifted both in time and in energy. The reference curves are found by applying to the transmitted signal the same filter applied to the received signal.Type: GrantFiled: December 2, 2019Date of Patent: August 3, 2021Assignee: Nestwave SASInventor: Rabih Chrabieh
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Publication number: 20210091820Abstract: A method for estimating a time of arrival of a signal transmitted over a wireless channel, includes receiving the signal by a receiving device; correlating the received signal with a filtered code sequence to create a correlation output, identifying in the correlation output, an observation window associated with a main lobe in the correlation output; and processing the observation window to determine a time of arrival of a first path component in the received signal. The filtered code sequence is formed by incorporating a time of arrival matched filter (TOA-MF) inside predetermined shaped code sequence. The TOA-MF is matched to the predetermined shaped code sequence and is based upon a power delay profile of the wireless channel. The computed shaped code sequence is a convolution of a predetermined shaping sequence and a predetermined code sequence.Type: ApplicationFiled: November 19, 2020Publication date: March 25, 2021Inventor: Rabih Chrabieh
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Patent number: 10880678Abstract: A time of arrival of a signal received by a receiving device over a wireless channel is estimated by identifying by the receiving device a location in the time domain of a first path component in a waveform of the received signal, which includes applying a filter to the waveform; identifying in the waveform an observation window associated with an energy rise in the waveform; correlating the identified observation window in the waveform with correlator sequences, and determining a time of arrival offset of the first path component from results of correlating the observation window with the correlator sequences. The properties of the correlator sequences depend on properties of the filter such that the correlator sequences account for the filtering of the waveform during the correlating, the correlator sequences reduce the effect of colored noise after hypothetical first path components; and the correlator sequences correspond to different time shifts of a hypothetical first path component.Type: GrantFiled: August 7, 2019Date of Patent: December 29, 2020Assignee: Nestwave SASInventor: Rabih Chrabieh
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Publication number: 20200103491Abstract: A technique is provided for estimating time of arrival of a signal transmitted as a pulse and received as a sum of pulses. The received signal is filtered with a novel filter that lowers the early side lobes of the received signal to noise level. A first energy rise point is identified at a point of the main lobe of the filtered received signal, at which the energy is higher than the noise by a predetermined level. Starting from the identification of the first energy rise points, the time of arrival is estimated via curve matching, in which the shape of the filtered received signal is matched to the shape of a reference curve composed by a sum of one or more reference curves that are shifted both in time and in energy. The reference curves are found by applying to the transmitted signal the same filter applied to the received signal.Type: ApplicationFiled: December 2, 2019Publication date: April 2, 2020Inventor: Rabih Chrabieh
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Patent number: 10539652Abstract: A technique is provided for estimating time of arrival of a signal transmitted as a pulse and received as a sum of pulses. The received signal is filtered with a novel filter that lowers the early side lobes of the received signal to noise level. A first energy rise point is identified at a point of the main lobe of the filtered received signal, at which the energy is higher than the noise by a predetermined level. Starting from the identification of the first energy rise points, the time of arrival is estimated via curve matching, in which the shape of the filtered received signal is matched to the shape of a reference curve composed by a sum of one or more reference curves that are shifted both in time and in energy. The reference curves are found by applying to the transmitted signal the same filter applied to the received signal.Type: GrantFiled: July 5, 2018Date of Patent: January 21, 2020Assignee: Nestwave SASInventor: Rabih Chrabieh
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Patent number: 10397801Abstract: Positioning determination of a communication device in a wireless communication network is supported by a positioning device receiving [230] tight synchronization signals from a master positioning cell; determining [232] therefrom a plurality of time differences between their actual and theoretical times of arrival; synchronizing [234] a positioning cell clock based on the received tight synchronization signals adjusted by the time differences; and emitting [236] to the communication device a positioning signal at a time determined by the synchronization. The positioning signal includes an identifier of the positioning cell, and it is transmitted so as not to interfere with positioning pilot signals transmitted by the wireless communication network. The positioning device may alternatively receive synchronization signals from another positioning cell instead of a master positioning cell.Type: GrantFiled: February 18, 2019Date of Patent: August 27, 2019Assignee: Nestwave SASInventor: Rabih Chrabieh
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Publication number: 20190182679Abstract: Positioning determination of a communication device in a wireless communication network is supported by a positioning device receiving [230] tight synchronization signals from a master positioning cell; determining [232] therefrom a plurality of time differences between their actual and theoretical times of arrival; synchronizing [234] a positioning cell clock based on the received tight synchronization signals adjusted by the time differences; and emitting [236] to the communication device a positioning signal at a time determined by the synchronization. The positioning signal includes an identifier of the positioning cell, and it is transmitted so as not to interfere with positioning pilot signals transmitted by the wireless communication network. The positioning device may alternatively receive synchronization signals from another positioning cell instead of a master positioning cell.Type: ApplicationFiled: February 18, 2019Publication date: June 13, 2019Inventor: Rabih Chrabieh
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Patent number: 10212608Abstract: Positioning determination of a communication device in a wireless communication network is supported by a positioning device receiving [230] tight synchronization signals from a master positioning cell; determining [232] therefrom a plurality of time differences between their actual and theoretical times of arrival; synchronizing [234] a positioning cell clock based on the received tight synchronization signals adjusted by the time differences; and emitting [236] to the communication device a positioning signal at a time determined by the synchronization. The positioning signal includes an identifier of the positioning cell, and it is transmitted so as not to interfere with positioning pilot signals transmitted by the wireless communication network. The positioning device may alternatively receive synchronization signals from another positioning cell instead of a master positioning cell.Type: GrantFiled: April 26, 2018Date of Patent: February 19, 2019Assignee: Nestwave SASInventor: Rabih Chrabieh
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Publication number: 20180313930Abstract: A technique is provided for estimating time of arrival of a signal transmitted as a pulse and received as a sum of pulses. The received signal is filtered with a novel filter that lowers the early side lobes of the received signal to noise level. A first energy rise point is identified at a point of the main lobe of the filtered received signal, at which the energy is higher than the noise by a predetermined level. Starting from the identification of the first energy rise points, the time of arrival is estimated via curve matching, in which the shape of the filtered received signal is matched to the shape of a reference curve composed by a sum of one or more reference curves that are shifted both in time and in energy. The reference curves are found by applying to the transmitted signal the same filter applied to the received signal.Type: ApplicationFiled: July 5, 2018Publication date: November 1, 2018Inventor: Rabih Chrabieh
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Publication number: 20180249344Abstract: Positioning determination of a communication device in a wireless communication network is supported by a positioning device receiving [230] tight synchronization signals from a master positioning cell; determining [232] therefrom a plurality of time differences between their actual and theoretical times of arrival; synchronizing [234] a positioning cell clock based on the received tight synchronization signals adjusted by the time differences; and emitting [236] to the communication device a positioning signal at a time determined by the synchronization. The positioning signal includes an identifier of the positioning cell, and it is transmitted so as not to interfere with positioning pilot signals transmitted by the wireless communication network. The positioning device may alternatively receive synchronization signals from another positioning cell instead of a master positioning cell.Type: ApplicationFiled: April 26, 2018Publication date: August 30, 2018Inventor: Rabih Chrabieh
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Patent number: 10042037Abstract: A technique is provided for estimating time of arrival of a signal transmitted as a pulse and received as a sum of pulses. The received signal is filtered with a novel filter that lowers the early side lobes of the received signal to noise level. A first energy rise point is identified at a point of the main lobe of the filtered received signal, at which the energy is higher than the noise by a predetermined level. Starting from the identification of the first energy rise points, the time of arrival is estimated via curve matching, in which the shape of the filtered received signal is matched to the shape of composed by a sum of one or more reference curves that are shifted both in time and in energy. The reference curves are found by applying to the transmitted signal the same filter applied to the received signal.Type: GrantFiled: February 19, 2015Date of Patent: August 7, 2018Assignee: Nestwave SASInventors: Rabih Chrabieh, Bogdan Franovici
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Patent number: 9961559Abstract: Positioning determination of a communication device in a wireless communication network is supported by a positioning device receiving [230] tight synchronization signals from a master positioning cell; determining [232] therefrom a plurality of time differences between their actual and theoretical times of arrival; synchronizing [234] a positioning cell clock based on the received tight synchronization signals adjusted by the time differences; and emitting [236] to the communication device a positioning signal at a time determined by the synchronization. The positioning signal includes an identifier of the positioning cell, and it is transmitted so as not to interfere with positioning pilot signals transmitted by the wireless communication network. The positioning device may alternatively receive synchronization signals from another positioning cell instead of a master positioning cell.Type: GrantFiled: October 2, 2017Date of Patent: May 1, 2018Assignee: Nestwave SASInventor: Rabih Chrabieh
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Publication number: 20180027421Abstract: Positioning determination of a communication device in a wireless communication network is supported by a positioning device receiving [230] tight synchronization signals from a master positioning cell; determining [232] therefrom a plurality of time differences between their actual and theoretical times of arrival; synchronizing [234] a positioning cell clock based on the received tight synchronization signals adjusted by the time differences; and emitting [236] to the communication device a positioning signal at a time determined by the synchronization. The positioning signal includes an identifier of the positioning cell, and it is transmitted so as not to interfere with positioning pilot signals transmitted by the wireless communication network. The positioning device may alternatively receive synchronization signals from another positioning cell instead of a master positioning cell.Type: ApplicationFiled: October 2, 2017Publication date: January 25, 2018Inventor: Rabih Chrabieh
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Patent number: 9813877Abstract: A system for accurate positioning of a communication devices includes a plurality of positioning cells configured for synchronizing to the cellular network and to each other, and for emitting positioning signals during time intervals proximal to time points at which the cellular network emits synchronization signals. In the manner, the positioning signals reach the communication device when the communication device's antenna is on for listening to a synchronization signal of the cellular network. Processing the times of arrival of the positioning signals by a server in communication with the communication device enables accurate positioning of the communication device.Type: GrantFiled: December 14, 2015Date of Patent: November 7, 2017Assignee: Nestwave SASInventor: Rabih Chrabieh
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Publication number: 20160306027Abstract: A technique is provided for estimating time of arrival of a signal transmitted as a pulse and received as a sum of pulses. The received signal is filtered with a novel filter that lowers the early side lobes of the received signal to noise level. A first energy rise point is identified at a point of the main lobe of the filtered received signal, at which the energy is higher than the noise by a predetermined level. Starting from the identification of the first energy rise points, the time of arrival is estimated via curve matching, in which the shape of the filtered received signal is matched to the shape of composed by a sum of one or more reference curves that are shifted both in time and in energy. The reference curves are found by applying to the transmitted signal the same filter applied to the received signal.Type: ApplicationFiled: February 19, 2015Publication date: October 20, 2016Inventors: Rabih Chrabieh, Bogdan Franovici, Dirk Slock
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Patent number: 9281861Abstract: Low-power transmitter and/or receiver devices are provided by sacrificing time and/or frequency diversity in exchange for lower power consumption. When channel conditions indicate that time and/or frequency spreading are unnecessary for transmissions, a transmitter may enter into a power-conservation mode in which transmissions are performed using a time gating scheme or a time repetition scheme. In the time gating scheme, symbols are transmitting just once, rather than a plurality of times, but with increased transmission power. In the time repetition scheme, copies of the same symbol are transmitted a plurality of times on the same frequency on different symbol transmission periods, instead of being retransmitted on different frequencies on different symbol transmission periods. Consequently, the symbol can be generated once and stored for subsequent retransmission, thereby allowing some of the transmitter/receiver chain components can be operated at a lower duty cycle or processing speed to conserve power.Type: GrantFiled: March 11, 2013Date of Patent: March 8, 2016Assignee: QUALCOMM IncorporatedInventors: Samir Soliman, Ozgur Dural, Krishnan Rajamani, Rabih Chrabieh