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Jari M Heinonen

from Seattle, WA
Age ~56

Jari Heinonen Phones & Addresses

  • 2319 1St Ave, Seattle, WA 98121
  • 2922 Western Ave, Seattle, WA 98121 (206) 448-7467
  • Kiona, WA

Publications

Us Patents

Apparatus And Method For Synchronization In A Multiple-Carrier Communication System By Observing Energy Within A Guard Band

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US Patent:
6389087, May 14, 2002
Filed:
Jun 14, 2000
Appl. No.:
09/593449
Inventors:
Jari M. Heinonen - Seattle WA
Michael R. Hirano - Redmond WA
Assignee:
ATT Wireless Services, Inc. - Redmond WA
International Classification:
H04L 700
US Classification:
375354, 375260, 370350, 370503
Abstract:
A method, apparatus and system detects a loss of synchronization between a transmitter and a receiver in a multiple-carrier communication system such as an OFDM system. A guard band synchronization detector provides a synchronization indicator based on the energy detected within a guard band where a pilot tone is transmitted adjacent to the guard band. A timing error results in energy leakage into one or more guard bands. In one embodiment, a plurality of synchronization indicators are observed to determine whether a loss of synchronization between a transmitter and a receiver in the wireless system has occurred.

Automatic Gain Control Methods And Apparatus Suitable For Use In Ofdm Receivers

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US Patent:
6574292, Jun 3, 2003
Filed:
Jan 17, 2002
Appl. No.:
10/051714
Inventors:
Jari M. Heinonen - Seattle WA
Michael R. Hirano - Redmond WA
Hongliang Zhang - Bellevue WA
Assignee:
ATT Wireless Services, Inc. - Redmond WA
International Classification:
H04L 2708
US Classification:
375345, 4552341, 4552401, 4552452, 4552511
Abstract:
Automatic gain control (AGC) methods and apparatus suitable for use in orthogonal frequency division multiplexing (OFDM) receivers are described. One AGC method includes the steps of repeatedly performing a first AGC process which adjusts amplifier gain based on determining that a signal level of multiple time sample values is outside a limit set by a first predefined threshold; and repeatedly performing a second AGC process which adjusts the amplifier gain based on determining that a signal level of multiple frequency sample values associated with a plurality of pilot tones is outside a limit set by a second predefined threshold. Preferably, the first AGC process is performed repeatedly at a first rate and the second AGC process is performed repeatedly at a second rate that is less than the first rate.

Methods And Apparatus For Use In Obtaining Frequency Synchronization In An Ofdm Communication System

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US Patent:
6700866, Mar 2, 2004
Filed:
Jun 14, 2000
Appl. No.:
09/594890
Inventors:
Jari M. Heinonen - Seattle WA
Michael R. Hirano - Redmond WA
Steven E. McMeekin - Nederland CO
Reijo Savola - Raahe, FI
William H. Warner - Maple Ridge, CA
Assignee:
ATT Wireless Services, Inc. - Redmond WA
International Classification:
H04B 700
US Classification:
370208, 370310, 370491
Abstract:
An iterative method involves performing a coarse frequency correction process which adjusts receiver frequency so that a pilot tone signal is within a predetermined frequency range and, after performing the coarse frequency correction process, performing a fine frequency correction process which adjusts receiver frequency so that the pilot tone signal is substantially aligned with a pilot tone reference within the predetermined frequency range. By performing these processes, the receiver frequency may be adjusted so that the alias pilot tone signal is substantially aligned with the pilot tone reference and the pilot tone signal is undesirably shifted outside the predetermined frequency range. To eliminate this condition, the method further involves performing the coarse frequency correction process again and, after performing the coarse frequency correction process again, performing the fine frequency correction process again. By performing the coarse frequency correction process again, receiver frequency is adjusted so that the pilot tone signal is within both the predetermined frequency range and the Nyquist sampling frequency range.

Methods And Apparatus For Use In Obtaining Frequency Synchronization In An Ofdm Communication System

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US Patent:
6768714, Jul 27, 2004
Filed:
Jun 14, 2000
Appl. No.:
09/594886
Inventors:
Jari M. Heinonen - Seattle WA
Michael R. Hirano - Redmond WA
Steven E. McMeekin - Nederland CO
Assignee:
ATT Wireless Services, Inc. - Redmond WA
International Classification:
H04J 1100
US Classification:
370208, 370343, 370503, 375364
Abstract:
A frequency correction process involves the steps of generating a plurality of tone values for a plurality of tone bins, where the plurality of tone bins includes a first set of tone bins assigned to a first frequency range and a second set of tone bins assigned to a second frequency range; performing complex conjugate multiplication between the tone values of the first and the second sets of tone bins; identifying a maximum value from results of the complex conjugate multiplication; and shifting receiver frequency based on a location of the maximum value relative to a predetermined pilot tone location. In this method, the first frequency range corresponds to a lower edge portion of a frequency band of interest, an upper edge portion of a lower adjacent frequency band, and a lower guard band in between the lower and the upper edge portions; and the second frequency range corresponds to an upper edge portion of the frequency band of interest, a lower edge portion of an upper adjacent frequency band, and an upper guard band in between the upper and lower edge portions.

Distributed Radio System With Multiple Transceivers For Simulcasting And Selective Processing Of Received Signals

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US Patent:
6778518, Aug 17, 2004
Filed:
Jul 16, 2002
Appl. No.:
10/197320
Inventors:
Mary Jesse - Redmond WA
Jari Heinonen - Seattle WA
Elliott Hoole - Sammamish WA
Brian Schladetzky - Bellevue WA
Greg Veintimilla - Sammamish WA
Assignee:
RadioFrame Networks, Inc. - Bellevue WA
International Classification:
H04Q 724
US Classification:
370338, 370312, 370328, 370349, 455422, 455503
Abstract:
A distributed radio system with multiple transceivers for simulcasting and selective processing of received signals is provided. The distributed radio system includes a plurality of processing elements and radio frequency transmitter elements interconnected by an Ethernet network. The system designates a number of radio frequency transmitter elements to be elements of a radio frequency simulcast set. The system utilizes relatively few frequency channels, and transmits at very low power levels, and thus causes minimal interference with an existing macrocellular environment. When signals transmitted from a mobile unit are detected by multiple radio receivers, the system is able to select a desired radio receiver signal for processing. When selecting a received signal for processing, the system utilizes a distributed processing technique that performs the selection process throughout several levels. The distributed processing utilized by the selection process may be synchronized.

Methods And Apparatus For Use In Obtaining Frame Synchronization In An Ofdm Communication System

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US Patent:
6807147, Oct 19, 2004
Filed:
Jun 13, 2000
Appl. No.:
09/592961
Inventors:
Jari M. Heinonen - Seattle WA
Michael R. Hirano - Redmond WA
Steven E. McMeekin - Nederland CO
Assignee:
ATT Wireless Services, Inc. - Redmond WA
International Classification:
H04J 1100
US Classification:
370208, 370252, 370347, 375362
Abstract:
An orthogonal frequency division multiplexing (OFDM) communication system includes base units which simultaneously transmit pilot tones in a predetermined pilot tone pattern during one or more time slots of a message slot. OFDM signals are received within a time slot; an OFDM signal level is determined at each frequency of a plurality of pilot tone frequencies; the signal levels and the predetermined pilot tone pattern are correlated; and a pattern detection value based on performing the correlation is generated and stored. This process is repeated for each time slot of a plurality of time slots. This process may be repeated for a plurality of message frame durations to produce a plurality of averaged pattern detection values, following which the plurality of averaged pattern detection values and a predetermined message frame pattern may be correlated. Then, a boundary of a message slot may be detected based on the correlation.

Apparatus And Method For Synchronization In A Multiple-Carrier Communication System By Observing A Plurality Of Synchronization Indicators

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US Patent:
6930995, Aug 16, 2005
Filed:
Jun 14, 2000
Appl. No.:
09/593215
Inventors:
Jari M. Heinonen - Seattle WA, US
Michael R. Hirano - Redmond WA, US
Assignee:
Cingular Wireless II, LLC - Atlanta GA
International Classification:
H04J003/06
US Classification:
370350, 370503
Abstract:
A method, apparatus and system detects a loss of synchronization between a transmitter and a receiver in a multiple-carrier communication system such as an OFDM system. A plurality of synchronization indicators are observed to determine whether a loss of synchronization between a transmitter and a receiver in the wireless system has occurred. In one embodiment, the receiver is determined to have lost synchronization with the transmitter if two or more of the three synchronization indicators indicate a loss of synchronization. In such an embodiment, the three synchronization indicators include a timing error indicator, an energy guard band indicator and a phase-frequency slope indicator.

Apparatus And Method For Synchronization In A Multiple-Carrier Communications System By Observing A Phase-Frequency Relationship Of A Plurality Of Pilot Signals

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US Patent:
6940933, Sep 6, 2005
Filed:
Jun 14, 2000
Appl. No.:
09/593547
Inventors:
Jari M. Heinonen - Seattle WA, US
Michael R. Hirano - Redmond WA, US
Assignee:
Cingular Wireless II, LLC - Atlanta GA
International Classification:
H04L007/00
US Classification:
375354, 375375, 370515, 370518, 370519
Abstract:
A method, apparatus and system detects a loss of synchronization between a transmitter and a receiver in a multiple-carrier communication system such as an OFDM system. A phase-frequency synchronization detector determines when the receiver has lost synchronization with the transmitter based on a phase-frequency relationship of plurality of pilot signals transmitted at different frequencies from the transmitter and received at the receiver. A loss of synchronization is detected when a slope of a line defined by the phase-frequency relationship exceeds a timing threshold more at a rate in excess of an occurrence threshold within a time period.

Wikipedia

Jari Sarasvuo

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Jari Sarasvuo (born Jari Heinonen, June 12, 1965) is the founder, chief owner and CEO of Trainer's House, a Finnish company that arranges training and lectures particularly for ...

Jari M Heinonen from Seattle, WA, age ~56 Get Report