Patents by Inventor Filip Zalio
Filip Zalio 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: 8744013Abstract: A device for performing channel estimation in an OFDM system includes a non-volatile memory, a G matrix selector and a channel estimate generator. The non-volatile memory stores a set of G matrices indexed by signal to noise ratio, the G matrices being precalculated for a plurality of signal to noise ratios using a fixed Doppler frequency and a fixed delay spread. The G matrix selector uses a quantised signal to noise ratio to select a G matrix from the set of G matrices stored in the non-volatile memory. The channel estimate generator multiplies the selected G matrix by LS estimates for the reference signal to obtain a channel estimation.Type: GrantFiled: January 7, 2011Date of Patent: June 3, 2014Assignee: NEC CorporationInventors: Duong Pham, Filip Zalio
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Patent number: 8599977Abstract: The invention is suitable for use in an OFDM system, such as the 3GPP-LTE mobile phone system. A method of estimating Doppler spread in a mobile communications device includes: (a) selecting a channel estimate from each of a sequence of time slots at each of a series of selected sub-carrier frequencies; (b) performing a Digital Fourier Transform (DFT) on the selected channel estimates at each selected sub-carrier frequency to thereby compute DFT components at different frequency bins; (c) summing the DFT components at all selected sub-carrier frequencies for each different frequency bin; (d) detecting the frequency bin at which the summed DFT components first falls below a predetermined threshold; and (e) converting the detected frequency bin into a Doppler spread estimate.Type: GrantFiled: September 11, 2009Date of Patent: December 3, 2013Assignee: NEC CorporationInventor: Filip Zalio
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Publication number: 20120320961Abstract: A device for performing channel estimation in an OFDM system includes a non-volatile memory, a G matrix selector and a channel estimate generator. The non-volatile memory stores a set of G matrices indexed by signal to noise ratio, the G matrices being precalculated for a plurality of signal to noise ratios using a fixed Doppler frequency and a fixed delay spread. The G matrix selector uses a quantised signal to noise ratio to select a G matrix from the set of G matrices stored in the non-volatile memory. The channel estimate generator multiplies the selected G matrix by LS estimates for the reference signal to obtain a channel estimation.Type: ApplicationFiled: January 7, 2011Publication date: December 20, 2012Inventors: Duong Pham, Filip Zalio
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Patent number: 8284883Abstract: In a method of identifying a time reference in signal received from a transmitter, a replica of a synchronization sequence is generated on the basis of at least one known transmission parameter and is compared to a sequence derived from the signal received from the transmitter to identify a reference point in the signal received from the transmitter.Type: GrantFiled: April 3, 2008Date of Patent: October 9, 2012Assignee: NEC CorporationInventor: Filip Zalio
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Publication number: 20110200073Abstract: The invention is suitable for use in an OFDM system, such as the 3GPP-LTE mobile phone system. A method of estimating Doppler spread in a mobile communications device includes: (a) selecting a channel estimate from each of a sequence of time slots at each of a series of selected sub-carrier frequencies; (b) performing a Digital Fourier Transform (DFT) on the selected channel estimates at each selected sub-carrier frequency to thereby compute DFT components at different frequency bins; (c) summing the DFT components at all selected sub-carrier frequencies for each different frequency bin; (d) detecting the frequency bin at which the summed DFT components first falls below a predetermined threshold; and (e) converting the detected frequency bin into a Doppler spread estimate.Type: ApplicationFiled: September 11, 2009Publication date: August 18, 2011Applicant: NEC CorporationInventor: Filip Zalio
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Patent number: 7995539Abstract: A method of scheduling cell search activity in a mobile communication user terminal (28) during transmission gap sequencing in burst mode, the method comprising the steps of: maintaining (404) a table (62) of regular periodic patterns of discreet cell search commands for execution during the transmission gap sequences, wherein the commands are ordered by the desired execution times; and sequentially executing commands (408-414) in the table at the desired execution time.Type: GrantFiled: May 23, 2005Date of Patent: August 9, 2011Assignee: NEC CorporationInventor: Filip Zalio
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Patent number: 7848391Abstract: A method of cancelling interference induced by a coherent interference source in a spread spectrum receiver comprising the steps of: quantifying (44; 94) first interference values induced by the coherent interference source (SCH) in symbols on a first spread spectrum physical channel (P-CCPCH; CPICH); calculating (46, 48, 50; 96, 98, 100) second interference values induced by the coherent interference source in symbols on a second spread spectrum channel (DPCH) from the first interference values; and applying (18; 74) a correction value, derived from the second interference values, to the symbols on the second spread spectrum channel.Type: GrantFiled: February 8, 2006Date of Patent: December 7, 2010Assignee: NEC CorporationInventors: Mikhail Shnaider, Vasic Dobrica, Holly He, Filip Zalio
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Publication number: 20100046653Abstract: In a method of identifying a time reference in signal received from a transmitter, a replica of a synchronization sequence is generated on the basis of at least one known transmission parameter and is compared to a sequence derived from the signal received from the transmitter to identify a reference point in the signal received from the transmitter.Type: ApplicationFiled: April 3, 2008Publication date: February 25, 2010Inventor: Filip Zalio
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Patent number: 7599335Abstract: A method of cell search in a wireless communication systems having a plurality of base stations and a mobile station, each of the plurality of base stations serving a separate cell within a service area and transmitting a common primary synchronization code (PSC) in a primary synchronization channel within a slot of a radio frame, the method including the steps of: (a) scanning (72) through radio channels in scanning increments corresponding to a standard channel raster; (b) estimating (98) the PSC signal-to-noise ratio of each radio channel; (c) if a PSC signal-to-noise ratio is above a first predetermined threshold level (100), completing a cell search procedure including slot synchronization, frame synchronization and scrambling code detection steps for that radio channel; (d) if the cell search procedure is successfully completed (112) for the radio channel in step (c), increasing the scanning increments to the broadcast frequency separation between cells; (e) when all radio channels are scanned in step (Type: GrantFiled: June 18, 2004Date of Patent: October 6, 2009Assignee: NEC CorporationInventors: Filip Zalio, Vasic Dobrica
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Patent number: 7561543Abstract: A method of performing a continuous cell search for new cells in a wireless communication systems having a plurality of base stations and a mobile station, the method including the steps of: (a) using (1) a primary synchronization code to acquire slot synchronization for identified cells; (b) using (2) a secondary synchronization code to find frame synchronization and identify a code group of the identified cells; (c) determining (3) a primary scrambling code used by the identified cells; and (d) rejecting (4) cells corresponding to previously identified primary scrambling codes from post-processing, wherein the method further includes the steps of: (e) correlating slot timings identified in step (a) with frame timings corresponding to primary scrambling codes identified in previous runs of steps (b) and (c); and (f) rejecting slot timings identified in step (a) from further processing in steps (b) and (c) when correlation is detected.Type: GrantFiled: March 16, 2005Date of Patent: July 14, 2009Assignee: NEC CorporationInventor: Filip Zalio
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Publication number: 20090028222Abstract: A method of cancelling interference induced by a coherent interference source in a spread spectrum receive comprises the steps of: quantifying (44; 94) first interference values induced by the coherent interference source (SCH) in symbols on a first spread spectrum physical channel (P-CCPCH; CPICH); calculating (46, 48, 50; 96, 98, 100) second interference values induced by the coherent interference source in symbols on a second spread spectrum channel (DPCH) from the first interference values; and applying (18; 74) a correction value, derived from the second interference values, to the symbols on the second spread spectrum channel.Type: ApplicationFiled: February 8, 2006Publication date: January 29, 2009Applicant: NEC CORPORATIONInventors: Mikhail Shnaider, Vasic Dobrica, Holly He, Filip Zalio
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Publication number: 20080254803Abstract: A method of scheduling cell search activity in a mobile communication user terminal (28) during transmission gap sequencing in burst mode, the method comprising the steps of: maintaining (404) a table (62) of regular periodic patterns of discreet cell search commands for execution during the transmission gap sequences, wherein the commands are ordered by the desired execution times; and sequentially executing commands (408-414) in the table at the desired execution time.Type: ApplicationFiled: May 23, 2005Publication date: October 16, 2008Inventor: Filip Zalio
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Publication number: 20070177535Abstract: A method of performing a continuous cell search for new cells in a wireless communication systems having a plurality of base stations and a mobile station, the method including the steps of: (a) using (1) a primary synchronization code to acquire slot synchronization for identified cells; (b) using (2) a secondary synchronization code to find frame synchronization and identify a code group of the identified cells; (c) determining (3) a primary scrambling code used by the identified cells; and (d) rejecting (4) cells corresponding to previously identified primary scrambling codes from post-processing, wherein the method further includes the steps of: (e) correlating slot timings identified in step (a) with frame timings corresponding to primary scrambling codes identified in previous runs of steps (b) and (c); and (f) rejecting slot timings identified in step (a) from further processing in steps (b) and (c) when correlation is detected.Type: ApplicationFiled: March 16, 2005Publication date: August 2, 2007Applicant: NEC CORPORATIONInventor: Filip Zalio
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Patent number: 7248658Abstract: A clock generation circuit for a dual system radio frequency station is provided. The station includes a digital synthesis circuit clocked by a first clock signal for a first RF system that is adapted to generate a base signal output of a predetermined frequency. A second clock signal is derived from the sum of the frequency of the base signal and the frequency of the first clock signal.Type: GrantFiled: October 2, 2001Date of Patent: July 24, 2007Assignee: NEC CorporationInventor: Filip Zalio
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Publication number: 20070010280Abstract: A method of cell search in a wireless communication systems having a plurality of base stations and a mobile station, each of the plurality of base stations serving a separate cell within a service area and transmitting a common primary synchronisation code (PSC) in a primary synchronisation channel within a slot of a radio frame, the method including the steps of: (a) scanning (72) through radio channels in scanning increments corresponding to a standard channel raster; (b) estimating (98) the PSC signal-to-noise ratio of each radio channel; (c) if a PSC signal-to-noise ratio is above a first predetermined threshold level (100), completing a cell search procedure including slot synchronisation, frame synchronisation and scrambling code detection steps for that radio channel; (d) if the cell search procedure is successfully completed (112) for the radio channel in step (c), increasing the scanning increments to the broadcast frequency separation between cells; (e) when all radio channels are scanned in step (Type: ApplicationFiled: June 18, 2004Publication date: January 11, 2007Applicant: NEC CORPORATIONInventors: Filip Zalio, Vasic Dobrica
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Patent number: 6985514Abstract: An automatic gain control circuit (3) for a direct sequence spread spectrum receiver. A discrimination unit (10) generates a discrimination signal error from received in-phase and quadrature base band signals, whilst multiplication unit (16) multiplies the discrimination signal error by a first loop gain constant during signal acquisition and a second different loop gain constant during signal tracking. A recursive integrator (22) then acquires an integrated AGC value from the multiplied discrimination signal error. By using two different values of loop gain, the circuit is able to alternate between a “fast mode” during signal acquisition, and a “slow track” mode during signal tracking.Type: GrantFiled: October 31, 2001Date of Patent: January 10, 2006Assignee: NEC CorporationInventors: Filip Zalio, Dobrica Vasic
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Publication number: 20020075944Abstract: An automatic gain control circuit (3) for a direct sequence spread spectrum receiver. A discrimination unit (10) generates a discrimination signal error from received in-phase and quadrature base band signals, whilst multiplication unit (16) multiplies the discrimination signal error by a first loop gain constant during signal acquisition and a second different loop gain constant during signal tracking. A recursive integrator (22) then acquires an integrated AGC value from the multiplied discrimination signal error.Type: ApplicationFiled: October 31, 2001Publication date: June 20, 2002Inventors: Filip Zalio, Dobrica Vasic
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Publication number: 20020039396Abstract: A clock generation circuit (21) for a dual system radio frequency (RF) station, including:Type: ApplicationFiled: October 2, 2001Publication date: April 4, 2002Applicant: NEC CORPORATIONInventor: Filip Zalio