Patents by Inventor Jaakko Vihriala
Jaakko Vihriala 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: 11387871Abstract: A technique is provided including at least obtaining a noise and interference covariance matrix, performing scaling of the noise and interference covariance matrix, determining a sum of diagonal elements of the scaled noise and interference covariance matrix, performing a first spectral shift by the sum to the scaled noise and interference covariance matrix to obtain a first spectral shifted matrix, performing eigenvalue decomposition to the first spectral shifted matrix to obtain an eigenvalue matrix, performing a second spectral shift by the sum to the eigenvalue matrix, limiting the eigenvalue matrix to a diagonal matrix, and obtaining a new noise and interference covariance matrix adding the scaled noise and interference covariance matrix and eigenvalue pairs that are obtained based, at least partly, on the performed eigenvalue decomposition.Type: GrantFiled: August 20, 2021Date of Patent: July 12, 2022Assignee: Nokia Technologies OyInventors: Olli Piirainen, Jaakko Vihriälä, Ori Shental, Sivarama Venkatesan, Juha Myllylä
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Publication number: 20220060220Abstract: A method comprising obtaining a noise and interference covariance matrix, performing scaling of the noise and interference covariance matrix, determining a sum of diagonal elements of the scaled noise and interference covariance matrix, performing a first spectral shift by the sum to the scaled noise and interference covariance matrix to obtain a first spectral shifted matrix, performing eigenvalue decomposition to the first spectral shifted matrix to obtain an eigenvalue matrix, performing a second spectral shift by the sum to the eigenvalue matrix, limiting the eigenvalue matrix to a diagonal matrix, and obtaining a new noise and interference covariance matrix adding the scaled noise and interference covariance matrix and eigenvalue pairs that are obtained based, at least partly, on the performed eigenvalue decomposition.Type: ApplicationFiled: August 20, 2021Publication date: February 24, 2022Applicant: Nokia Technologies OyInventors: Olli PIIRAINEN, Jaakko VIHRIÄLÄ, Ori SHENTAL, Sivarama VENKATESAN, Juha MYLLYLÄ
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Patent number: 8321735Abstract: A length Nd?2 of a vector is determined, the vector indicating a type of data non-associated control signaling (e.g., CQI+ACK, CQI+NACK, or CQI-only). The length Nd may be sent individually to UEs or broadcast in the cell. The network decodes a received message using a sub-code word from its memory having the determined length Nd. From the sub-code word the network determines what type of data non-associated control signaling is in the received message, and may jointly decode CQI and the ACK/NACK. Varying the length Nd achieves an error performance: longer Nd deteriorates CQI performance and increases ACK/NACK performance. The UE receives the indication of the length Nd, determines a channel quality vector and also a type-vector from its memory having the length Nd, and multiplexes and jointly encodes the vector of length Nd with the channel quality vector.Type: GrantFiled: October 30, 2008Date of Patent: November 27, 2012Assignee: Nokia Siemens Networks OyInventor: Jaakko Vihriala
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Publication number: 20090113268Abstract: A length Nd?2 of a vector is determined, the vector indicating a type of data non-associated control signaling (e.g., CQI+ACK, CQI+NACK, or CQI-only). The length Nd may be sent individually to UEs or broadcast in the cell. The network decodes a received message using a sub-code word from its memory having the determined length Nd. From the sub-code word the network determines what type of data non-associated control signaling is in the received message, and may jointly decode CQI and the ACK/NACK. Varying the length Nd achieves an error performance: longer Nd deteriorates CQI performance and increases ACK/NACK performance. The UE receives the indication of the length Nd, determines a channel quality vector and also a type-vector from its memory having the length Nd, and multiplexes and jointly encodes the vector of length Nd with the channel quality vector.Type: ApplicationFiled: October 30, 2008Publication date: April 30, 2009Inventor: Jaakko Vihriala
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Patent number: 7489734Abstract: A solution for equalization in a radio receiver is provided. According to the provided solution, equalization with a zero forcing equalization algorithm is improved with frequency domain processing of received information symbols. The frequency spectrum of received information symbols is modified with a calculated frequency domain representation of the radio channel impulse response. Thereafter, the information symbols having the modified frequency spectrum are filtered with a zero forcing filter having the filter coefficients calculated through a zero forcing algorithm.Type: GrantFiled: December 30, 2005Date of Patent: February 10, 2009Assignee: Nokia CorporationInventor: Jaakko Vihriälä
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Patent number: 7266143Abstract: The invention relates to a method for multiple access interference suppression and to a receiver applying the method. A preliminarily detected signal is spreading coded and channel distorted in a MAI estimator (350) for generating an estimate signal (274) corresponding to a received and reception-filtered signal. Pulses (360) corresponding to a signal component of each path of each user are generated from the signal in a pulse generator block (300), and the pulses are combined according to path delays into a pulse sequence (362) in a combiner (310). In a filter (312), the pulse sequence (362) is subjected to waveform filtering, which is the convolution of reception filtering and pulse shaping filtering. Finally, in a summer (220), the estimate signal (274) is subtracted from the received and reception-filtered signal (270) to cancel multiple access interference.Type: GrantFiled: April 11, 2003Date of Patent: September 4, 2007Assignee: Nokia CorporationInventor: Jaakko Vihriälä
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Publication number: 20070104282Abstract: A solution for equalization in a radio receiver is provided. According to the provided solution, equalization with a zero forcing equalization algorithm is improved with frequency domain processing of received information symbols. The frequency spectrum of received information symbols is modified with a calculated frequency domain representation of the radio channel impulse response. Thereafter, the information symbols having the modified frequency spectrum are filtered with a zero forcing filter having the filter coefficients calculated through a zero forcing algorithm.Type: ApplicationFiled: December 30, 2005Publication date: May 10, 2007Inventor: Jaakko Vihriala
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Publication number: 20070054619Abstract: The invention relates to a radio network, comprising means for receiving an uplink signal from a user using the radio network, means for performing interference cancellation on the received uplink signal, means for estimating a load factor for the received uplink signal, the load factor indicating the load the uplink signal causes on a network element of the radio network, wherein the load factor is estimated by taking into consideration the interference cancellation performed on the received uplink signal, and means for using the estimated load factor when allocating radio resources in the radio network.Type: ApplicationFiled: November 10, 2005Publication date: March 8, 2007Inventors: Pasi Kinnunen, Jaakko Vihriala, Kari Horneman
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Patent number: 7062284Abstract: A method for code tracking RAKE receiver fingers, the method comprising: taking several successive samples from a received signal, combining sample values measured in different fingers into measurement value sets, comparing the measurement value sets with each other and selecting the measurement value set having the highest value from among the measurement value sets meeting a minimum delay distance condition for the fingers, if any one of the sample values of the selected measurement value set is earlier than an on-time sample value determined on the basis of code phase acquisition, advancing the sampling or code phase of the particular finger, and if any one of the sample values of the selected measurement value set is later than an on-time sample value determined on the basis of code acquisition, delaying the sampling or code phase of the particular finger.Type: GrantFiled: April 28, 2003Date of Patent: June 13, 2006Assignee: Nokia CorporationInventor: Jaakko Vihriälä
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Patent number: 7016397Abstract: The invention relates to a method of processing multipath-propagated components of a signal in a communications system. In the method, a signal transmitted on the radio channel of the communications system is received in a RAKE receiver and an impulse response of the radio channel is formed. In the method, one or more taps having the highest signal energy in the impulse response are located and matched to a short matched filter. A weighting value for the impulse response is calculated on the basis of the one or more taps in the matched filter and a deviation between the weighting value and the center point of the matched filter is compared with a threshold value set for the deviation. The matched filter is moved toward the deviation when the deviation exceeds the threshold value set for the deviation.Type: GrantFiled: September 1, 2000Date of Patent: March 21, 2006Assignee: Nokia Networks OyInventor: Jaakko Vihriälä
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Patent number: 6956895Abstract: The invention concerns generally the technology of reducing frequency offset in a radio receiver. Especially the invention concerns receivers where a channel estimator is used for correcting the base band signal. The objects of the invention are achieved by monitoring the phase of the channel estimation output and generating a complex phasor on the basis of successive phase values. The received baseband signal is then multiplied by the generated complex phasor for compensating the frequency offset. The frequency compensation can be made before or after said channel estimation thus producing a feedback compensation or feed forward compensation. The feedback compensation can be implemented by compensating the baseband signal either prior to the despreading or after the despreading.Type: GrantFiled: May 24, 2001Date of Patent: October 18, 2005Assignee: Nokia Mobile Phones Ltd.Inventor: Jaakko Vihriälä
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Patent number: 6804212Abstract: The invention relates to a method and arrangement for establishing a connection between a base station and mobile station. The invention is especially applicable to digital TDMA (Time Division Multiple Access) and CDMA (Code Division Multiple Access) cellular systems which use extended cell operating ranges. An idea of the invention is that when establishing a connection a mobile station transmits access bursts using a preferably extended timing advance different from zero. In one embodiment, different timing advance values are used until a timing advance is found with which the burst falls on a CCCH channel time slot at the base station. The mobile station preferably transmits the first bursts using the normal timing advance, the next bursts using a second timing advance, the corresponding timing advance parameter value being the normal timing advance parameter maximum value+1, and the subsequent bursts using a timing advance of 2×the second timing advance, etc.Type: GrantFiled: June 1, 2000Date of Patent: October 12, 2004Assignee: Nokia Mobile Phones Ltd.Inventors: Jari Vallström, Harri Jokinen, Jaakko Vihriälä
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Publication number: 20030215004Abstract: The invention relates to a method for multiple access interference suppression and to a receiver applying the method. A preliminarily detected signal is spreading coded and channel distorted in a MAI estimator (350) for generating an estimate signal (274) corresponding to a received and reception-filtered signal. Pulses (360) corresponding to a signal component of each path of each user are generated from the signal in a pulse generator block (300), and the pulses are combined according to path delays into a pulse sequence (362) in a combiner (310). In a filter (312), the pulse sequence (362) is subjected to waveform filtering, which is the convolution of reception filtering and pulse shaping filtering. Finally, in a summer (220), the estimate signal (274) is subtracted from the received and reception-filtered signal (270) to cancel multiple access interference.Type: ApplicationFiled: April 11, 2003Publication date: November 20, 2003Inventor: Jaakko Vihriala
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Publication number: 20030186714Abstract: A method for code tracking RAKE receiver fingers, the method comprising: taking several successive samples from a received signal, combining sample values measured in different fingers into measurement value sets, comparing the measurement value sets with each other and selecting the measurement value set having the highest value from among the measurement value sets meeting a minimum delay distance condition for the fingers, if any one of the sample values of the selected measurement value set is earlier than an on-time sample value determined on the basis of code phase acquisition, advancing the sampling or code phase of the particular finger, and if any one of the sample values of the selected measurement value set is later than an on-time sample value determined on the basis of code acquisition, delaying the sampling or code phase of the particular finger.Type: ApplicationFiled: April 28, 2003Publication date: October 2, 2003Inventor: Jaakko Vihriala
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Publication number: 20020045433Abstract: The invention concerns generally the technology of reducing frequency offset in a radio receiver. Especially the invention concerns receivers where a channel estimator is used for correcting the base band signal. The objects of the invention are achieved by monitoring the phase of the channel estimation output and generating a complex phasor on the basis of successive phase values. The received baseband signal is then multiplied by the generated complex phasor for compensating the frequency offset. The frequency compensation can be made before or after said channel estimation thus producing a feedback compensation or feedforward compensation. The feedback compensation can be implemented by compensating the baseband signal either prior to the despreading or after the despreading.Type: ApplicationFiled: May 24, 2001Publication date: April 18, 2002Inventor: Jaakko Vihriala