Patents by Inventor Olli Piirainen

Olli Piirainen 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).

  • Publication number: 20170033961
    Abstract: A method and apparatus is disclosed for determining a signal subspace in a communications system. A remote apparatus obtains signal streams from antenna elements or signal streams from antenna beams. Based on the obtained signal streams, the apparatus selects a signal subspace for a user, the signal sub-space having a dimension M. Based on the selected signal subspace, the apparatus transmits, via an interface to a central apparatus, M streams of post-fast-Fourier-transform data, the interface being capable of transmitting a different sub-space for different frequency bins.
    Type: Application
    Filed: April 14, 2014
    Publication date: February 2, 2017
    Applicant: Nokia Solutions and Networks OY
    Inventors: Olli Piirainen, Shirish NAGARAJ
  • Patent number: 9137760
    Abstract: A method and corresponding equipment for use by a mobile station and/or a radio access network, for altering one or more characteristics of transmissions of the mobile station to a base transceiver station of the radio access network in respect to power and/or modulation and/or coding of the transmissions, based on monitoring broadcast transmissions from other base transceiver stations of the radio access network and determining an estimate of the likelihood of transmissions by the mobile station interfering with communication between the other base transceiver stations and the mobile stations in communication with those other base transceiver stations.
    Type: Grant
    Filed: March 22, 2007
    Date of Patent: September 15, 2015
    Assignee: NOKIA TECHNOLOGIES OY
    Inventors: Jari Hulkkonen, Olli Piirainen, Kari Niemela, Mikko Saily
  • Publication number: 20140087746
    Abstract: Methods, apparatuses, controllers, systems, and terminals can, in certain embodiments, determine a number and properties of potential interferers in a plurality of available radio channels. The properties of the potential interferers can include modulation methods used by the potential interferers. A network element responsible for channel allocation can perform channel allocation for a terminal and select a modulation method for the allocated channel on the basis of the determination.
    Type: Application
    Filed: November 25, 2013
    Publication date: March 27, 2014
    Applicant: Core Wireless Licensing S.A.R.L.
    Inventors: Jari HULKKONEN, Olli PIIRAINEN
  • Patent number: 8600419
    Abstract: Methods, apparatuses, controllers, systems, and terminals can, in certain embodiments, determine a number and properties of potential interferers in a plurality of available radio channels. The properties of the potential interferers can include modulation methods used by the potential interferers. A network element responsible for channel allocation can perform channel allocation for a terminal and select a modulation method for the allocated channel on the basis of the determination.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: December 3, 2013
    Assignee: Core Wireless Licensing S.A.R.L.
    Inventors: Jari Hulkkonen, Olli Piirainen
  • Patent number: 8320947
    Abstract: A network element, a terminal and a method of allocating a radio channel to a connection between a terminal and a base station in a telecommunication system are provided. The number and properties of potential interferers in a plurality of available radio channels are determined, and channel allocation is performed on the basis of the determination.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: November 27, 2012
    Assignee: Core Wireless Licensing S.A.R.L.
    Inventors: Jari Hulkkonen, Olli Piirainen
  • Patent number: 8155252
    Abstract: A frequency error correction scheme applicable in a receiver of a mobile telecommunication system is presented. The present frequency error correction scheme is carried out in a time domain after an equalization process. The present frequency error correction scheme may be applied to a base station receiving signals transmitted according to a single-carrier frequency division multiple access communication scheme. The separation of different received signals for further processing is carried out in the frequency domain before the equalization and the frequency error correction.
    Type: Grant
    Filed: June 4, 2007
    Date of Patent: April 10, 2012
    Assignee: Nokia Corporation
    Inventors: Olli Piirainen, Markku Vainikka, Juha P. Karjalainen
  • Patent number: 8081717
    Abstract: An apparatus includes a radio frequency receiver and a timing adjustment unit that contains at least two channel impulse response estimators. The at least two channel impulse response estimators include an on-time estimator and at least one of an early estimator and a late estimator. The apparatus also includes a calculation unit that is configurable to obtain a channel estimate for each measured channel impulse response and to average obtained channel estimates over a plurality of received signal events to determine a timing adjustment in accordance with residual signal power.
    Type: Grant
    Filed: February 11, 2008
    Date of Patent: December 20, 2011
    Assignee: Nokia Siemens Networks Oy
    Inventors: Juha P Karjalainen, Markku Vainikka, Olli Piirainen
  • Patent number: 7920635
    Abstract: There is provided a method of clipping a transmission signal. The method comprises: providing a residual signal of a complex envelope clipper based on the transmission signal to be clipped; providing a reference signal respective to the residual signal, the reference signal corresponding to an ideal residual signal; forming a clipping signal on the basis of the residual signal and the reference signal; subtracting the clipping signal from the residual signal for removing higher amplitudes of the residual signal; and subtracting the clipping signal from the reference signal for providing a reference signal respective to the clipped residual signal.
    Type: Grant
    Filed: August 28, 2007
    Date of Patent: April 5, 2011
    Assignee: Nokia Corporation
    Inventor: Olli Piirainen
  • Patent number: 7889798
    Abstract: A method of reducing the peak-to-mean ratio of a multi-carrier signal includes the steps of: generating a residual signal from the multicarrier signal, the residual signal representing the difference between the multicarrier signal and a hard-clipped multicarrier signal. The method also includes the steps of applying a least squares function to the residual signal for each carrier of the multi-carrier signal, thereby generating a minimized residual signal for each carrier and combining the minimized residual signals and the multicarrier signal.
    Type: Grant
    Filed: July 28, 2003
    Date of Patent: February 15, 2011
    Assignee: Nokia Corporation
    Inventors: Olli Piirainen, Miia Karjalainen
  • Patent number: 7885318
    Abstract: A method, mobile device, network device, system, and software are devised for soft value scaling with a single antenna interference cancellation (SAIC) receiver, or with an interference rejection combining (IRC) receiver, in an unsynchronized network. A signal is received having interference that is caused by a non-synchronized network. A desired power level of that signal is calculated. Then the desired power is compared to a total power of the signal, in order to identify a portion of a received burst having substantial interference. Then that portion of the received burst is weighted, to reduce its importance during decoding.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: February 8, 2011
    Assignee: Nokia Corporation
    Inventors: Mikko Saily, Olli Piirainen, Kari Niemela, Jari Hulkkonen
  • Patent number: 7808964
    Abstract: The specification and drawings present a new method, system, apparatus and software product for using a new modified dual symbol rate (MDSR) in an uplink direction in mobile communication systems. The communication between the mobile station and the network element may be performed within evolved GSM/EDGE radio access networks. The MDSR can be for example one and a half times a symbol rate of an uplink speech service, e.g., the current GSM/EDGE symbol rate (13/48 MHz) in the mobile communication system, thus the MDSR may be substantially 13/32 MHz or about 405 kHz. The uplink signal with the MDSR may be modulated, e.g., using a quadrature amplitude modulation (QAM), e.g., 16-QAM with 16 states and/or a quadrature phase-shift keying (QPSK, or ?/4-QPSK) modulation.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: October 5, 2010
    Assignee: Nokia Corporation
    Inventors: Olli Piirainen, Kari Niemela, Jari Hulkkonen, Mikko Saily
  • Patent number: 7778615
    Abstract: An indicator of a strength of a signal comprising a training sequence portion received in a radio propagation environment is provided. Samples are taken from the training sequence portion, an energy value of the samples over an estimated channel impulse response is computed and the indicator of the strength of the signal is estimated from the energy value.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: August 17, 2010
    Assignee: Nokia Corporation
    Inventors: Mikko Saily, Olli Piirainen, Kari Niemela, Jari Hulkkonen
  • Patent number: 7672642
    Abstract: Embodiments of the invention relate to uplink communication in a GSM/EDGE telecommunication system. A method according to certain embodiments of the invention include at least one wide-band carrier wave in the group of carrier waves being generated in a mobile station by applying linear modulation at a first modulation symbol rate, the first modulation symbol rate being a multiple of a second modulation symbol rate, while preserving a predefined carrier spacing and allowing the at least one wide-band carrier wave to overlap with at least one adjacent carrier wave.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: March 2, 2010
    Assignee: Nokia Corporaation
    Inventor: Olli Piirainen
  • Patent number: 7653160
    Abstract: The invention relates to a method of estimating a noise and interference covariance matrix and to a receiver. The method comprises: estimating an initial noise and interference covariance matrix on the basis of a received signal; reducing the impact of the background noise of the receiver from the initial noise and interference covariance matrix for obtaining a residual matrix; accepting the obtained residual matrix when the residual matrix is at least approximately positive semidefinite; modifying the obtained residual matrix such that the positive semidefinity of the residual matrix is achieved when the residual matrix is not at least approximately positive semidefinite; and adding the impact of background noise back to the residual matrix for estimating a final noise and interference covariance matrix.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: January 26, 2010
    Assignee: Nokia Corporation
    Inventor: Olli Piirainen
  • Patent number: 7643801
    Abstract: A transmitter clips a transmission signal before transmission in order to reduce the strength of at least one peak of the transmission signal exceeding a predetermined threshold. The transmitter includes a clipper having a minimizer, a filter and an adder. The minimizer minimizes of a cost function with respect to an optimization signal, the cost function having weighted terms as a function of the optimization signal. The terms relate to an effective modulation distortion and an effective overshoot exceeding the predetermined threshold. The filter forms a clipping signal by filtering the optimization signal formed as a result of the minimization according to the spectrum emission mask requirements of the radio system. The adder subtracts the clipping signal from the transmission signal.
    Type: Grant
    Filed: March 8, 2005
    Date of Patent: January 5, 2010
    Assignee: Nokia Siemens Networks Oy
    Inventor: Olli Piirainen
  • Publication number: 20090202031
    Abstract: An apparatus includes a radio frequency receiver and a timing adjustment unit that contains at least two channel impulse response estimators. The at least two channel impulse response estimators include an on-time estimator and at least one of an early estimator and a late estimator. The apparatus also includes a calculation unit that is configurable to obtain a channel estimate for each measured channel impulse response and to average obtained channel estimates over a plurality of received signal events to determine a timing adjustment in accordance with residual signal power.
    Type: Application
    Filed: February 11, 2008
    Publication date: August 13, 2009
    Inventors: Juha P. Karjalainen, Markku J. Vainikka, Olli Piirainen
  • Patent number: 7561643
    Abstract: A method of simultaneously determining a DC offset and a channel impulse response from a received signal in a mobile communication system. The received signal Y comprising a set of training sequence bits that have been modulated prior to transmission. The modulated signals experience a certain phase shift and are rotated by a certain angle. The received signal may also comprise a DC offset component ADC that needs to be removed. By manipulation of the received signal samples with the knowledge of the original training sequence TRS and method of modulation used, it is possible to simultaneously estimate the communication channel's impulse response H and the DC offset ADC by finding the Least Square solution to a linear equation, such that the energy of the noise term introduced into the communication channel may be kept to a minimum.
    Type: Grant
    Filed: October 27, 1999
    Date of Patent: July 14, 2009
    Assignee: Nokia Corporation
    Inventor: Olli Piirainen
  • Patent number: 7561648
    Abstract: There is disclosed a technique for generating an improved estimate of the frequency error in a received signal, and more particularly the application of such a technique in the equalization circuitry of a wireless network element.
    Type: Grant
    Filed: October 30, 2002
    Date of Patent: July 14, 2009
    Assignee: Nokia Siemens Networks Oy
    Inventor: Olli Piirainen
  • Patent number: 7546105
    Abstract: The invention relates to interference cancellation in a receiver in a radio system. The receiver receives at least two input data signals, and extracts an interference estimate signal specific to each input data signal. An interference estimate signal covariance matrix is calculated, and autoregressive parameters and covariance parameters are estimated from the covariance matrix. Interference is canceled from the at least two input data signals by finite impulse response filters using the estimated parameters as filter coefficients in the finite impulse response filters.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: June 9, 2009
    Assignee: Nokia Corporation
    Inventor: Olli Piirainen
  • Patent number: 7542734
    Abstract: The invention provides a data transmission solution in a telecommunication system. According to the invention, a data transmission scheme is selected for a first transceiver unit, which comprises a plurality of transmit antennas, on the basis of the quality of a communication link and transmit antenna correlation information associated with the first transceiver unit, from a list including at least the following data transmission schemes: transmitting different data from each antenna of the first transceiver unit, the data transmitted from one antenna being independent of the data transmitted from another antenna; and transmitting the same data from each antenna of the first transceiver unit and controlling the direction of the transmitted data according to the properties of a radio channel. The selection of the data transmission scheme is carried out during an active communication link between the first and a second transceiver unit.
    Type: Grant
    Filed: October 12, 2005
    Date of Patent: June 2, 2009
    Assignee: Nokia Corporation
    Inventor: Olli Piirainen