Patents by Inventor Ramin Sadr
Ramin Sadr 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: 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: 8981908Abstract: Systems and methods for decoding data transmitted by RFID tags are disclosed. One embodiment of the invention includes an analyzer and equalizer configured to filter an input signal, an estimation block configured to obtain a baseband representation of the modulated data signal by mixing the filtered input signal with the carrier wave, and a coherent detector configured to perform phase and timing recovery on the modulated data signal in the presence of noise and to determine a sequence of data symbols.Type: GrantFiled: October 7, 2013Date of Patent: March 17, 2015Assignee: Mojix, Inc.Inventor: Ramin Sadr
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Patent number: 8941472Abstract: RFID data signals from RFID tags may be recovered by determining the probabilities of transitions between data states between a series of a pairs of signal samples using a set of predetermined probabilities related to data, timing, baud rate and/or phase variables affecting the received signal and processing those determined probabilities to determine the sequence of such transitions that has the highest probability of occurrence. A second set of predetermined probabilities related to transitions in the opposite direction may be used to sequence in a reverse direction. The determination of the sequence representing the RFID tag data may be iterated in both directions until further iterations do not change the determined probabilities.Type: GrantFiled: February 6, 2013Date of Patent: January 27, 2015Assignee: Mojix, Inc.Inventor: Ramin Sadr
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Publication number: 20140292492Abstract: A multi-protocol, multi-band array antenna system may be used in Radio Frequency Identification (RFID) system reader and sensory networks. The antenna array may include array elements with an integrated low noise amplifier. The system may employ digital beam forming techniques for transmission and steering of a beam to a specific sensor tag or group of tags in a cell. The receive beam forming network is optimized for detecting signals from each sensor tag. Narrow and wideband interferences may be excised by an interference nulling algorithm. Space division multiplexing may be used by the antenna system to enhance system processing capacity.Type: ApplicationFiled: June 16, 2014Publication date: October 2, 2014Inventor: Ramin Sadr
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Publication number: 20140292494Abstract: RFID systems are disclosed that include at least one RFID receiver system and a distributed exciter architecture. Exciters can be connected via wired and/or wireless connections to the RFID receiver system, which can control activation of the exciters to detect the presence of RFID tags within interrogation spaces defined by the exciter topology. One embodiment includes an RFID receiver system configured to detect information from RFID tags within a receive coverage area, and a plurality of exciters defining a plurality of interrogation spaces within the receive coverage area of the receiver system. The receiver system is configured to transmit a control signal that identifies one of the exciters and includes information indicative of an RFID tag interrogation signal, the exciters are configured to receive the control signal, and the exciter identified in the control signal is configured to illuminate an interrogation space with the RFID tag interrogation signal.Type: ApplicationFiled: March 14, 2014Publication date: October 2, 2014Applicant: Mojix, Inc.Inventors: Ramin Sadr, John Gevargiz, Robert Lee, Majid Manteghi, Gordon Oliver, Michael Collender, Christopher Jones, Syed Hassan Yousef
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Publication number: 20140253293Abstract: Systems and methods for providing an estimate of a population of passive Radio Frequency Identification (RFID) sensors in a coverage area of an RFID reader system are disclosed. In accordance with embodiments of this invention, the contention resolutions or results of each slot in an interrogation receive frame are determined. The contention resolutions are then used to determine the probabilities of different population estimates. A population estimate is then selected as the population based on the probability of the estimate meeting predetermined criteria.Type: ApplicationFiled: March 11, 2014Publication date: September 11, 2014Applicant: Mojix, Inc.Inventor: Ramin Sadr
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Publication number: 20140218172Abstract: Systems and methods for decoding data transmitted by RFID tags are disclosed. One embodiment of the invention includes an analyzer and equalizer configured to filter an input signal, an estimation block configured to obtain a baseband representation of the modulated data signal by mixing the filtered input signal with the carrier wave, and a coherent detector configured to perform phase and timing recovery on the modulated data signal in the presence of noise and to determine a sequence of data symbols.Type: ApplicationFiled: October 7, 2013Publication date: August 7, 2014Applicant: Mojix, Inc.Inventor: Ramin Sadr
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Publication number: 20140203914Abstract: Systems and methods for locating one or more radio frequency identification (RFID) tags are provided. A phase difference of received information signals of illuminated RFID tags is utilized to locate the RFID tags. One or more exciters transmit interrogation signals to illuminate the RFID tags in which the exciters may have a plurality of antenna selectively configured to transmit through two or more antennas and to receive on one antenna. Multiple reads of the same RFID tag can also be performed to generate a probability model of the location of the RFID tag. An enhanced particle filter is applied to probability model to determine the exact location of the RFID.Type: ApplicationFiled: December 20, 2013Publication date: July 24, 2014Applicant: Mojix, Inc.Inventors: Ramin Sadr, Scott Stephens, Christopher Jones
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Patent number: 8768248Abstract: A multi-protocol, multi-band array antenna system may be used in Radio Frequency Identification (RFID) system reader and sensory networks. The antenna array may include array elements with an integrated low noise amplifier. The system may employ digital beam forming techniques for transmission and steering of a beam to a specific sensor tag or group of tags in a cell. The receive beam forming network is optimized for detecting signals from each sensor tag. Narrow and wideband interferences may be excised by an interference nulling algorithm. Space division multiplexing may be used by the antenna system to enhance system processing capacity.Type: GrantFiled: December 30, 2010Date of Patent: July 1, 2014Assignee: Mojix, Inc.Inventor: Ramin Sadr
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Patent number: 8680970Abstract: RFID systems are disclosed that include at least one RFID receiver system and a distributed exciter architecture. Exciters can be connected via wired and/or wireless connections to the RFID receiver system, which can control activation of the exciters to detect the presence of RFID tags within interrogation spaces defined by the exciter topology. One embodiment includes an RFID receiver system configured to detect information from RFID tags within a receive coverage area, and a plurality of exciters defining a plurality of interrogation spaces within the receive coverage area of the receiver system. The receiver system is configured to transmit a control signal that identifies one of the exciters and includes information indicative of an RFID tag interrogation signal, the exciters are configured to receive the control signal, and the exciter identified in the control signal is configured to illuminate an interrogation space with the RFID tag interrogation signal.Type: GrantFiled: February 1, 2013Date of Patent: March 25, 2014Assignee: Mojix, Inc.Inventors: Ramin Sadr, John Gevargiz, Robert Lee, Majid Manteghi, Gordon Oliver, Mike Collender, Christopher Jones, Hasan Syed
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Patent number: 8629762Abstract: Systems and methods for locating one or more radio frequency identification (RFID) tags are provided. A phase difference of received information signals of illuminated RFID tags is utilized to locate the RFID tags. One or more exciters transmit interrogation signals to illuminate the RFID tags in which the exciters may have a plurality of antenna selectively configured to transmit through two or more antennas and to receive on one antenna. Multiple reads of the same RFID tag can also be performed to generate a probability model of the location of the RFID tag. An enhanced particle filter is applied to probability model to determine the exact location of the RFID.Type: GrantFiled: December 1, 2011Date of Patent: January 14, 2014Assignee: Mojix, Inc.Inventors: Ramin Sadr, Scott Stephens, Christopher Jones
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Patent number: 8552835Abstract: Systems and methods for decoding data transmitted by RFID tags are disclosed. One embodiment of the invention includes an analyzer and equalizer configured to filter an input signal, an estimation block configured to obtain a baseband representation of the modulated data signal by mixing the filtered input signal with the carrier wave, and a coherent detector configured to perform phase and timing recovery on the modulated data signal in the presence of noise and to determine a sequence of data symbols.Type: GrantFiled: January 9, 2008Date of Patent: October 8, 2013Assignee: Mojix, Inc.Inventor: Ramin Sadr
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Patent number: 8400271Abstract: RFID data signals from RFID tags may be recovered by determining the probabilities of transitions between data states between a series of a pairs of signal samples using a set of predetermined probabilities related to data, timing, baud rate and/or phase variables affecting the received signal and processing those determined probabilities to determine the sequence of such transitions that has the highest probability of occurrence. A second set of predetermined probabilities related to transitions in the opposite direction may be used to sequence in a reverse direction. The determination of the sequence representing the RFID tag data may be iterated in both directions until further iterations do not change the determined probabilities.Type: GrantFiled: October 21, 2009Date of Patent: March 19, 2013Assignee: Mojix, Inc.Inventor: Ramin Sadr
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Patent number: 8395482Abstract: RFID systems are disclosed that include at least one RFID receiver system and a distributed exciter architecture. The exciters can be connected via wired and/or wireless connections to the RFID receiver system and the RFID receiver system can control the activation of the exciters to detect the presence of RFID tags within interrogation spaces defined by the exciter topology. In several embodiments, the RFID receiver system performs location estimation to determine the interrogation space in which a specific RFID tag or collection of RFID tags is located. One embodiment of the invention includes an RFID receiver system configured to detect information from RFID tags within a receive coverage area, and a plurality of exciters defining a plurality of interrogation spaces within the receive coverage area of the RFID receiver system.Type: GrantFiled: March 24, 2008Date of Patent: March 12, 2013Assignee: Mojix, Inc.Inventors: Ramin Sadr, John Gevargiz, Robert Lee, Majid Manteghi, Gordon Oliver, Mike Collender, Christopher Jones, Hasan Syed
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Patent number: 8332656Abstract: Systems for encoding and reading RFID tags on a collection of items are shown. One embodiment of the invention includes a plurality of items, where each item possesses an item identifier string, and a plurality of RFID tags, where an RFID tag is affixed to each of the items and each RFID tag is encoded with a code word element generated using at least all of the item identifier strings. In many embodiments, the collection is a plurality of goods contained within a case, pallet, container or storage area.Type: GrantFiled: January 9, 2008Date of Patent: December 11, 2012Assignee: Mojix, Inc.Inventors: Christopher Richard Jones, Ramin Sadr
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Publication number: 20120212331Abstract: Systems for encoding and reading RFID tags on a collection of items are shown. One embodiment of the invention includes a plurality of items, where each item possesses an item identifier string, and a plurality of RFID tags, where an RFID tag is affixed to each of the items and each RFID tag is encoded with a code word element generated using at least all of the item identifier strings. In many embodiments, the collection is a plurality of goods contained within a case, pallet, container or storage area.Type: ApplicationFiled: May 3, 2012Publication date: August 23, 2012Applicant: Mojix, Inc.Inventors: Christopher Richard Jones, Ramin Sadr
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Publication number: 20120139704Abstract: Systems and methods for locating one or more radio frequency identification (RFID) tags are provided. A phase difference of received information signals of illuminated RFID tags is utilized to locate the RFID tags. One or more exciters transmit interrogation signals to illuminate the RFID tags in which the exciters may have a plurality of antenna selectively configured to transmit through two or more antennas and to receive on one antenna. Multiple reads of the same RFID tag can also be performed to generate a probability model of the location of the RFID tag. An enhanced particle filter is applied to probability model to determine the exact location of the RFID.Type: ApplicationFiled: December 1, 2011Publication date: June 7, 2012Applicant: Mojix, Inc.Inventors: Ramin Sadr, Scott Stephens, Christopher Jones
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Patent number: 8174369Abstract: Systems for encoding and reading RFID tags on a collection of items are shown. One embodiment of the invention includes a plurality of items, where each item possesses an item identifier string, and a plurality of RFID tags, where an RFID tag is affixed to each of the items and each RFID tag is encoded with a code word element generated using at least all of the item identifier strings. In many embodiments, the collection is a plurality of goods contained within a case, pallet, container or storage area.Type: GrantFiled: November 29, 2007Date of Patent: May 8, 2012Assignee: Mojix, Inc.Inventors: Christopher Richard Jones, Ramin Sadr
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Patent number: 8072311Abstract: Systems and methods for locating one or more radio frequency identification (RFID) tags are provided. A phase difference of received information signals of illuminated RFID tags is utilized to locate the RFID tags. One or more exciters transmit interrogation signals to illuminate the RFID tags in which the exciters may have a plurality of antenna selectively configured to transmit through two or more antennas and to receive on one antenna. Multiple reads of the same RFID tag can also be performed to generate a probability model of the location of the RFID tag. An enhanced particle filter is applied to probability model to determine the exact location of the RFID.Type: GrantFiled: April 14, 2009Date of Patent: December 6, 2011Assignee: Mojix, Inc.Inventors: Ramin Sadr, Scott Stephens, Christopher Jones
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Publication number: 20110254664Abstract: Systems and methods are described that collect spatio-temporal data using an RFID system that is capable of locating the spatial position of a sensor, which is typically unaware of its location. Such systems and methods can be contrasted with conventional RFID systems in that they are able to determine the location of sensors in space as opposed to with respect to read zones related to the underlying RFID reader infrastructure.Type: ApplicationFiled: April 14, 2011Publication date: October 20, 2011Applicant: Mojix, Inc.Inventors: Ramin Sadr, Christopher Richard Jones