Patents by Inventor Emmanuel Lemois
Emmanuel Lemois 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: 8451958Abstract: A system for determining the burst start timing of a signal includes logic configured to receive the signal, generate correlation moduli and generate a first timing output based on the correlation moduli. The logic may also be configured to receive operating mode information and timing information and generate search controls. The logic may further be configured to identify a maximum of the correlation moduli using the search controls and determine a second timing output associated with the maximum correlation modulus. The second timing output represents a more accurate approximation of a burst start time than the first timing output.Type: GrantFiled: April 29, 2011Date of Patent: May 28, 2013Assignee: Juniper Networks, Inc.Inventors: Joseph Boutros, Emmanuel Lemois
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Patent number: 8219137Abstract: The present invention concerns a method for controlling the interference level generated by a mobile station comprising at least steps: selecting at least one neighbor base station; estimating a first attenuation value between the mobile station and a current base station, and at least a second attenuation value between the mobile station (MS) and the neighbor base station; estimating an interference level: I_level=BS0_RSS+L0?L wherein BS0_RSS is a first received signal strength at the base station, from the mobile station, L0 is the first attenuation value, and L is one second attenuation value estimated in preceding step, comparing the interference level to a reference interference level, and according to the result of the comparison, sending to the mobile station at least information relative to a maximum transmitted signal strength.Type: GrantFiled: March 6, 2009Date of Patent: July 10, 2012Assignee: Sequans CommunicationsInventors: Amelie Duschesne, Emmanuel Lemois
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Publication number: 20110206172Abstract: A system for determining the burst start timing of a signal includes logic configured to receive the signal, generate correlation moduli and generate a first timing output based on the correlation moduli. The logic may also be configured to receive operating mode information and timing information and generate search controls. The logic may further be configured to identify a maximum of the correlation moduli using the search controls and determine a second timing output associated with the maximum correlation modulus. The second timing output represents a more accurate approximation of a burst start time than the first timing output.Type: ApplicationFiled: April 29, 2011Publication date: August 25, 2011Applicant: Juniper Networks, Inc.Inventors: Joseph BOUTROS, Emmanuel Lemois
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Patent number: 7957494Abstract: A system for determining the burst start timing of a signal includes logic configured to receive the signal, generate correlation moduli and generate a first timing output based on the correlation moduli. The logic may also be configured to receive operating mode information and timing information and generate search controls. The logic may further be configured to identify a maximum of the correlation moduli using the search controls and determine a second timing output associated with the maximum correlation modulus. The second timing output represents a more accurate approximation of a burst start time than the first timing output.Type: GrantFiled: September 30, 2009Date of Patent: June 7, 2011Assignee: Juniper Networks, Inc.Inventors: Joseph Boutros, Emmanuel Lemois
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Publication number: 20100111236Abstract: A system for determining the burst start timing of a signal includes logic configured to receive the signal, generate correlation moduli and generate a first timing output based on the correlation moduli. The logic may also be configured to receive operating mode information and timing information and generate search controls. The logic may further be configured to identify a maximum of the correlation moduli using the search controls and determine a second timing output associated with the maximum correlation modulus. The second timing output represents a more accurate approximation of a burst start time than the first timing output.Type: ApplicationFiled: September 30, 2009Publication date: May 6, 2010Applicant: JUNIPER NETWORKS, INC.Inventors: Joseph BOUTROS, Emmanuel LEMOIS
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Patent number: 7706823Abstract: A method of synchronizing a base station of a wireless communication system and a subscriber communication equipment located in the coverage area of the base station by compensating a sampling frequency offset in the subscriber equipment by interpolating input and/or output signals of a radio frequency part of the communication equipment to generate samples corresponding to the original symbol timing of the base station, and compensating the carrier frequency offset from the estimate of the sampling clock error.Type: GrantFiled: June 30, 2006Date of Patent: April 27, 2010Assignee: Sequans CommunicationsInventors: Fabien Buda, Emmanuel Lemois, Bertrand Debray
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Patent number: 7616717Abstract: A system for determining the burst start timing of a signal includes logic configured to receive the signal, generate correlation moduli and generate a first timing output based on the correlation moduli. The logic may also be configured to receive operating mode information and timing information and generate search controls. The logic may further be configured to identify a maximum of the correlation moduli using the search controls and determine a second timing output associated with the maximum correlation modulus. The second timing output represents a more accurate approximation of a burst start time than the first timing output.Type: GrantFiled: November 16, 2006Date of Patent: November 10, 2009Assignee: Juniper Networks, Inc.Inventors: Joseph Boutros, Emmanuel Lemois
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Publication number: 20090233594Abstract: An embodiment of a method for controlling the interference level generated by a mobile station comprising at least steps: selecting at least one neighbor base station; estimating a first attenuation value between the mobile station and a current base station, and at least a second attenuation value between the mobile station and the neighbor base station; estimating an interference level: I_level=BS0—RSS+L0?L, BS0_RSS being a first received signal strength at the base station, from the mobile station, L0 being the first attenuation value, and L being one second attenuation value estimated in step B, comparing the interference level to a reference interference level, and according to the result of the comparison, sending to the mobile station at least information relative to a maximum transmitted signal strength.Type: ApplicationFiled: March 6, 2009Publication date: September 17, 2009Applicant: SEQUANS COMMUNICATIONSInventors: Amelie Duschesne, Emmanuel Lemois
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Publication number: 20080279322Abstract: An embodiment of a device for processing at least an incoming signal in a wireless communication system, said incoming signal being sent by a base station and comprising successive frames, each of which comprising at least a training symbol correlated to said base station, and a data symbol carrying message data. The device comprises at least: a first module digitizing and sampling the incoming signal; a second module demodulating said digitized and sampled incoming signal, and generating a corresponding frequency domain symbol; a timing synchronization and scanning module suitable for detecting at least a time offset of said training symbol by using said corresponding frequency domain symbol; and a timing post processing module for processing said timing offset and for generating an improved timing offset used to start the sampling of following incoming signal.Type: ApplicationFiled: February 5, 2008Publication date: November 13, 2008Applicant: SEQUANS COMMUNICATIONSInventors: Bogdan Franovici, Emmanuel Lemois
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Publication number: 20070019767Abstract: The method for synchronising a base station of a wireless communication system and a subscriber communication equipment located in the coverage area of the base station comprises the steps of compensating a sampling frequency offset in the subscriber equipment by interpolating input and/or output signals of a radio frequency part (30) of the communication equipment to generate samples corresponding to the original symbol timing of the base station, and compensating the carrier frequency offset from the estimate of the sampling clock error.Type: ApplicationFiled: June 30, 2006Publication date: January 25, 2007Inventors: Fabien Buda, Emmanuel Lemois, Bertrand Debray
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Methods and apparatus for efficient and accurate coarse timing synchronization in burst demodulators
Patent number: 7154967Abstract: Burst detection with high accuracy is achieved with a single autocorrelation circuit. Autocorrelation is performed using a preamble-embedded correlation sequence chosen such that a steeply sloped peak characterizes the autocorrelation response. The autocorrelation circuit is preferably used multiple times per clock period to deliver correlation moduli at sub-clock multiples. A contrast function makes a weighted comparison of each correlation modulus output by the autocorrelation circuit relative to adjacent correlation moduli. The contrast output defines a burst start-time uncertainty-window in a manner that is independent of signal level variability attributable to different operating conditions. A search is performed within the uncertainty window to identify the correlation maximum. Depending on the system mode (e.g., traffic mode vs. ranging mode), a priori knowledge may be preferred to the contrast output for defining the timing uncertainty window of the search.Type: GrantFiled: October 10, 2001Date of Patent: December 26, 2006Assignee: Juniper Networks, Inc.Inventors: Joseph Boutros, Emmanuel Lemois -
Patent number: 7031283Abstract: Method and system for enhancing channel capacity in a Point-to Multipoint radio communications system that includes terminal stations (12) of different kinds, such as residential terminals and business terminals, with different link budget requirements i.e. different signal-to-noise ratio. The method is characterized by the selective use of different channel coding codes such as forward error correction (FEC) codes, in the different concurrent channels, depending on a pre-defined category of an addressed subscriber. The multiplexing method used may be CDMA (Code Division Multiple Access) and TDMA (Time Division Multiple Access). Each terminal station (12) is in turn equipped only with an appropriate decoder, depending on its kind, e.g. residential or business.Type: GrantFiled: September 13, 2001Date of Patent: April 18, 2006Assignee: AlcatelInventors: Philippe Sehier, Emmanuel Lemois, Thierry Quignon
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Patent number: 6813307Abstract: In a radiocommunications system having physical channels each including at least one logical channel, the invention proposes transmitting both the means for acquiring and tracking synchronization and the system information addressed to user stations in a single logical channel referred to as the “synchronization” channel. For this purpose, the synchronization channel carries a repeated detection word (1) together with system information (2) between repeats of the detection word. The system information is subjected to spreading prior to being transmitted over the synchronization channel. The invention makes it possible to limit the amount of system resources that are devoted to providing the functions of synchronization and of broadcasting system information.Type: GrantFiled: June 8, 2000Date of Patent: November 2, 2004Assignee: AlcatelInventors: Michel Cohen, Emmanuel Lemois, Laurent Cuvelier
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Publication number: 20040017842Abstract: The invention relates to a method of receiving digital signals sent in the form of packets and modulated, for example phase and/or amplitude modulated, in which method received analog signals are sampled and optimum sampling times are determined individually for each packet. To estimate the optimum sampling time, at least two independent and uncorrelated estimates are effected and said estimates are combined so that the variance of the estimate obtained with the combination is lower than the lowest of the variances of the independent estimates. Accordingly, the quality of the combination is greater than the quality of the best of the estimates.Type: ApplicationFiled: March 14, 2002Publication date: January 29, 2004Applicant: ALCATELInventors: Fabien Buda, Emmanuel Lemois, Valerie Cueff, Michael Debbah
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Patent number: 6680966Abstract: The invention provides a spread-spectrum transmission system with multiple carrier modulation in which the signals for transmission over each of the subcarriers are filtered prior to being transmitted over the subcarrier, thereby making it possible on reception to synchronize the various subcarriers in time, and in which each subcarrier carries a plurality of chips that result from spreading a single symbol. With coherent modulation, the number of chips resulting from spreading a single symbol and transmitted over each subcarrier is selected so as to enable the various subcarriers to be put into phase alignment by recombining the chips coming from the same symbol on each subcarrier. With differential modulation, the transmission over each subcarrier of chips resulting from spreading a single symbol provides resistance to jamming by limiting recombination losses because of the differential modulation.Type: GrantFiled: October 15, 1999Date of Patent: January 20, 2004Assignee: AlcatelInventors: Emmanuel Lemois, Fabien Buda, Joël Richard
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Publication number: 20030215001Abstract: The invention provides a spread-spectrum transmission system with multiple carrier modulation in which the signals for transmission over each of the subcarriers are filtered prior to being transmitted over the subcarrier, thereby making it possible on reception to synchronize the various subcarriers in time, and in which each subcarrier carries a plurality of chips that result from spreading a single symbol. With coherent modulation, the number of chips resulting from spreading a single symbol and transmitted over each subcarrier is selected so as to enable the various subcarriers to be put into phase alignment by recombining the chips coming from the same symbol on each subcarrier. With differential modulation, the transmission over each subcarrier of chips resulting from spreading a single symbol provides resistance to jamming by limiting recombination losses because of the differential modulation.Type: ApplicationFiled: October 15, 1999Publication date: November 20, 2003Inventors: EMMANUEL LEMOIS, FABIEN BUDA, JOEL RICHARD
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Methods and apparatus for efficient and accurate coarse timing synchronization in burst demodulators
Publication number: 20020181622Abstract: Burst detection with high accuracy is achieved with a single autocorrelation circuit. Autocorrelation is performed using a preamble-embedded correlation sequence chosen such that a steeply sloped peak characterizes the autocorrelation response. The autocorrelation circuit is preferably used multiple times per clock period to deliver correlation moduli at sub-clock multiples. A contrast function makes a weighted comparison of each correlation modulus output by the autocorrelation circuit relative to adjacent correlation moduli. The contrast output defines a burst start-time uncertainty-window in a manner that is independent of signal level variability attributable to different operating conditions. A search is performed within the uncertainty window to identify the correlation maximum. Depending on the system mode (e.g., traffic mode vs. ranging mode), a priori knowledge may be preferred to the contrast output for defining the timing uncertainty window of the search.Type: ApplicationFiled: October 10, 2001Publication date: December 5, 2002Inventors: Joseph Boutros, Emmanuel Lemois -
Patent number: 6442219Abstract: A method of simultaneous phase synchronization and decoding that makes use of the maximum likelihood criterion is provided. The method is applied to signal packets received at a receiver, wherein the signals have been subjected to convolution encoding at the transmitter. The method consists of calculating branch metrics taking account firstly of firm decisions calculated on the received symbols and secondly of a magnitude that takes account of the phase error between the carrier of the signal and the local oscillator signal used at the receiver, the magnitude weighting the decision variables constituted by the complex digital components of the received symbols. This magnitude is equal to &Sgr;*k for each of the paths studied where: &Sgr;k=&Sgr;Nn=0rk−n·d*k−n.Type: GrantFiled: April 22, 1999Date of Patent: August 27, 2002Assignee: AlcatelInventors: Cyril Bertrand, Fabien Buda, Emmanuel Lemois
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Publication number: 20020031140Abstract: Method and system for enhancing channel capacity in a Point-to Multipoint radio communications system that includes terminals stations (12) of different kinds, such as residential terminals and business terminals, with different link budget requirements i.e. different signal-to-noise ratio. The method is characterized by the selective use of different channel coding codes such as forward error correction (FEC) codes, in the different concurrent channels, depending on a pre-defined category of an addressed subscriber. The multiplexing method used may be CDMA (Code Division Multiple Access) and TDMA (Time Division Multiple Access). Each terminal station (12) is in turn equipped only with an appropriate decoder, depending on its kind, e.g. residential or business.Type: ApplicationFiled: September 13, 2001Publication date: March 14, 2002Applicant: ALCATELInventors: Philippe Sehier, Emmanuel Lemois, Thierry Quignon