Patents by Inventor Juha Ylitalo
Juha Ylitalo 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: 9634388Abstract: A fixed phase shift for each of a plurality of radio frequency signal components directed to or received from a plurality of antenna elements is formed in a phase shifter. A desired antenna beam pattern with at least one grating lobe is formed on the basis of the phase-shifted radio frequency signal components of the antenna elements in a predefined antenna structure.Type: GrantFiled: October 13, 2008Date of Patent: April 25, 2017Assignee: ELEKTROBIT WIRELESS COMMUNICATIONS OYInventors: Juha Ylitalo, Taavi Hirvonen
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Patent number: 8565193Abstract: The invention relates to a method of transmitting data in a communications system. The invention comprises: receiving from a user an uplink signal using multiple narrow antenna beams; measuring beam-specific pilot signal powers from the uplink signal for all the beams; and using the measured pilot signal powers to determine which one or ones of the downlink beams is to be used for a downlink signal for the user.Type: GrantFiled: October 16, 2008Date of Patent: October 22, 2013Assignee: Elektrobit Wireless Communications OyInventor: Juha Ylitalo
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Patent number: 8451924Abstract: A radio channel simulation system comprises a plurality of input buses for receiving a beam-specific transmit signal. A transformation module transforms a channel model from antenna domain to beam domain by using a transformation algorithm and beam forming weights. The channel model represented in the beam domain is inputted into a processing module which processes the beam-specific transmit signals according to the channel model represented in the beam domain.Type: GrantFiled: April 25, 2007Date of Patent: May 28, 2013Assignee: Elektrobit System Test OyInventor: Juha Ylitalo
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Patent number: 8442144Abstract: A method includes receiving from a first station at a second station at least two space-time coded signals in respective formed beams of a multi-beam antenna array associated with the first station; receiving from the first station, in a signaling channel, a value representing a transmit power level; determining power control coefficients for each of the space-time coded signals; and transmitting the power control coefficients to the first station, wherein the control coefficients are for in part adjusting transmit power.Type: GrantFiled: August 31, 2010Date of Patent: May 14, 2013Assignee: Intellectual Ventures I LLCInventors: Juha Ylitalo, Marcos Katz
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Patent number: 8270375Abstract: An apparatus of a multi-antenna telecommunication system includes a beam forming unit configured to form at least two antenna beams, and a signal feeding unit connected to the beam forming unit and configured to feed beam-specific data streams to the beam forming unit. The beam-specific data streams are allocated to one and the same transceiver of the wireless telecommunication system, and each data stream includes independently and separately encoded data signals.Type: GrantFiled: June 28, 2007Date of Patent: September 18, 2012Assignee: Elektrobit Wireless Communications OyInventor: Juha Ylitalo
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Patent number: 8160601Abstract: The selection of the spatial mode together with modulation and encoding schemes based on channel condition measurements requested from MS forms a basis for selecting a best transmission data rate in a wireless link in every channel conditions. A method and network element comprising multiple-input multiple-output (MIMO) capable antenna technology allows the use of a best transmission data rate in the channel if selection of transmission mode has been made correctly. The thresholds for transmission mode selections are pre-determined and compared to instantaneous channel quality information. The practical MIMO solution based on correct selection procedure provides also continuous sufficient channel condition for terminal users when the user moves from LOS situation to NLOS situation.Type: GrantFiled: June 21, 2007Date of Patent: April 17, 2012Assignee: Elektrobit Wireless Communications Ltd.Inventors: Nenad Veselinovic, Juha Ylitalo
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Patent number: 8085721Abstract: The invention relates to a method, a base station and a computer program for selecting a spatial transmission method for a next downlink transmission in a base station. The base station can be a WiMAX, a UMTS or a 3 GPP LTE base station. According to the invention the base station makes a selection between beamforming (BF), space-time coding (STC) or MIMO for a next downlink frame. The selection is based on uplink measurements and feedback information from a particular mobile station whereto the next downlink frame is to be transmitted.Type: GrantFiled: March 10, 2008Date of Patent: December 27, 2011Assignee: Elektrobit Wireless Communications OyInventor: Juha Ylitalo
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Publication number: 20110255434Abstract: The invention relates to a method of transmitting data in a communications system. The invention comprises: receiving from a user an uplink signal using multiple narrow antenna beams; measuring beam-specific pilot signal powers from the uplink signal for all the beams; and using the measured pilot signal powers to determine which one or ones of the downlink beams is to be used for a downlink signal for the user.Type: ApplicationFiled: October 16, 2008Publication date: October 20, 2011Applicant: ELEKTROBIT WIRELESS COMMUNICATIONS OYInventor: Juha Ylitalo
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Publication number: 20110188595Abstract: A radio channel simulation system comprises a plurality of input buses for receiving a beam-specific transmit signal. A transformation module transforms a channel model from antenna domain to beam domain by using a transformation algorithm and beam forming weights. The channel model represented in the beam domain is inputted into a processing module which processes the beam-specific transmit signals according to the channel model represented in the beam domain.Type: ApplicationFiled: April 25, 2007Publication date: August 4, 2011Applicant: ELEKTROBIT SYSTEM TEST OYInventor: Juha Ylitalo
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Publication number: 20110188418Abstract: A fixed phase shift for each of a plurality of radio frequency signal components directed to or received from a plurality of antenna elements is formed in a phase shifter. A desired antenna beam pattern with at least one grating lobe is formed on the basis of the phase-shifted radio frequency signal components of the antenna elements in a predefined antenna structure.Type: ApplicationFiled: October 13, 2008Publication date: August 4, 2011Applicant: ELEKTROBIT WIRELESS COMMUNICATIONS OYInventors: Juha Ylitalo, Taavi Hirvonen
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Patent number: 7894857Abstract: The invention relates to a method and a system for improving operation of a radio link in a wireless communication system, such as a cellular radio system, by modifying the radiation pattern of an antenna array on the downlink by means of the information obtained from the uplink. The method comprises determining the location of a receiver for transmission by means of an angular power spectrum (400), for example. Then the radiation pattern of a transmitting antenna array is shaped on the basis of the location information on the receiver by selecting a window function which provides the desired radiation pattern and by implementing the form of the window function by means of antenna element specific coefficients (502, 504).Type: GrantFiled: August 1, 2002Date of Patent: February 22, 2011Assignee: Nokia Siemens Networks OYInventor: Juha Ylitalo
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Publication number: 20100322337Abstract: A method includes receiving at least two space-time coded signals from an antenna system associated with a first station, determining complex channel state information based on the received space-time coded signals, and sending the complex channel state information to the first station. In an alternative embodiment, a method includes transmitting at least two space-time coded signals in respective beams of a multi-beam antenna array, measuring a channel impulse response for each space-time coded signal at a second station, and sending an indicia of a selected set of least attenuated signals from the second station to the first station. The multi-beam antenna array is associated with a first station. The beams transmit a signature code embedded in each respective space-time coded signal, and the signature codes are orthogonal so that the second station can separate and measure the channel impulse response corresponding to each space-time coded signal.Type: ApplicationFiled: August 31, 2010Publication date: December 23, 2010Inventors: Juha Ylitalo, Marcos Katz
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Patent number: 7844010Abstract: A method includes receiving at least two space-time coded signals from an antenna system associated with a first station, determining complex channel state information based on the received space-time coded signals, and sending the complex channel state information to the first station. In an alternative embodiment, a method includes transmitting at least two space-time coded signals in respective beams of a multi-beam antenna array, measuring a channel impulse response for each space-time coded signal at a second station, and sending an indicia of a selected set of least attenuated signals from the second station to the first station. The multi-beam antenna array is associated with a first station. The beams transmit a signature code embedded in each respective space-time coded signal, and the signature codes are orthogonal so that the second station can separate and measure the channel impulse response corresponding to each space-time coded signal.Type: GrantFiled: March 2, 2005Date of Patent: November 30, 2010Inventors: Juha Ylitalo, Marcos Katz
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Patent number: 7792206Abstract: A method includes receiving a reference signal and at least one delayed space-time encoded signal via at least two beams in which a time delay is associated with at least one of the at least two beams; determining channel state information based on the received reference signal and the received at least one delayed space-time encoded signal; and segmenting the channel state information into a plurality of channel state information segments.Type: GrantFiled: March 2, 2005Date of Patent: September 7, 2010Inventors: Juha Ylitalo, Marcos Katz
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Publication number: 20100189055Abstract: An apparatus of a multi-antenna telecommunication system includes a beam forming unit configured to form at least two antenna beams, and a signal feeding unit connected to the beam forming unit and configured to feed beam-specific data streams to the beam forming unit. The beam-specific data streams are allocated to one and the same transceiver of the wireless telecommunication system, and each data stream includes independently and separately encoded data signals.Type: ApplicationFiled: June 28, 2007Publication date: July 29, 2010Applicant: ELEKTROBIT WIRELESS COMMUNICATIONS OYInventor: Juha Ylitalo
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Publication number: 20100177836Abstract: A radio channel simulation system comprises a plurality of input buses for receiving a beam-specific transmit signal. A transformation module transforms a channel model from antenna domain to beam domain by using a transformation algorithm and beam forming weights. The channel model represented in the beam domain is inputted into a processing module which processes the beam-specific transmit signals according to the channel model represented in the beam domain.Type: ApplicationFiled: April 25, 2007Publication date: July 15, 2010Applicant: ELEKTROBIT SYSTEM TEST OYInventor: Juha Ylitalo
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Publication number: 20090227249Abstract: The invention relates to a method, a base station and a computer program for selecting a spatial transmission method for a next downlink transmission in a base station. The base station can be a WiMAX, a UMTS or a 3GPP LTE base station. According to the invention the base station makes a selection between beamforming (BF), space-time coding (STC) or MIMO for a next downlink frame. The selection is based on uplink measurements and feedback information from a particular mobile station whereto the next downlink frame is to be transmitted.Type: ApplicationFiled: March 10, 2008Publication date: September 10, 2009Applicant: ELEKTROBIT WIRELESS COMMUNICATIONS OYInventor: Juha Ylitalo
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Publication number: 20090005120Abstract: A method and base station arrangement by which broadcast info messages can be transmitted using cyclic delays and a beamformer to the whole cell simultaneously. In the method during the broadcast info transmission cyclic delays are introduced to the transmitted symbols before the symbols are fed to a beamformer. The delayed symbols are transmitted using antennas connected to the beamformer. By utilizing cyclic delays dead zones can be avoided in the cell or sector. The method can be utilized for example in WiMAX, WiFi, UMTS or 3rd LTE networks.Type: ApplicationFiled: June 28, 2007Publication date: January 1, 2009Applicant: ELEKTROBIT WIRELESS COMMUNICATIONS OYInventor: Juha Ylitalo
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Publication number: 20080317014Abstract: The selection of the spatial mode together with modulation and encoding schemes based on channel condition measurements requested from MS forms a basis for selecting a best transmission data rate in a wireless link in every channel conditions. A method and network element comprising multiple-input multiple-output (MIMO) capable antenna technology allows the use of a best transmission data rate in the channel if selection of transmission mode has been made correctly. The thresholds for transmission mode selections are pre-determined and compared to instantaneous channel quality information. The practical MIMO solution based on correct selection procedure provides also continuous sufficient channel condition for terminal users when the user moves from LOS situation to NLOS situation.Type: ApplicationFiled: June 21, 2007Publication date: December 25, 2008Applicant: ELEKTROBIT WIRELESS COMMUNICATIONS LTD.Inventors: Nenad VESELINOVIC, Juha YLITALO
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Patent number: 7403748Abstract: The present invention relates to a method and system for transmitting a transmission signal from an antenna array (19) to a receiving means (20) of a wireless communication system, wherein a signal quality measurement is performed at the receiving means (20) for predetermined antennas or beams of said antenna array (19). Based on a feedback information derived from the signal quality measurement, at least two of the predetermined antennas or beams of the antenna array (19) are selected. The selected antennas or beams are used for transmitting said transmission signal according to a transmit diversity or beamforming scheme. Thus, spectral efficiency and diversity gain can be enhanced by using only selected ones of the predetermined antennas or beams.Type: GrantFiled: April 7, 2000Date of Patent: July 22, 2008Assignee: Nokia CoporationInventors: Ilkka Keskitalo, Juha Ylitalo, Marcos Katz