公开(公告)号：US20170041033A1

公开(公告)日：2017-02-09

申请号：US15303291

申请日：2014-04-11

Applicant: Nokia Solutions and Networks Oy

Inventor： Sathiaseelan Sundaralingam ,  Olli Juhani PIIRAINEN

IPC: H04B1/10 ,  H04W88/08

CPC classification number: H04B1/1081 ,  H04B1/10 ,  H04W88/08

Abstract: An apparatus and a method are provided. The solution includes controlling the reception of a signal; dividing the received signal into a predetermined number of signal streams including the same information; applying a linear process to each signal stream, the processes having different frequency characteristics for each stream; applying a shared interference rejection over the signal streams.

Abstract translation: 提供了一种装置和方法。 解决方案包括控制信号的接收; 将接收到的信号划分成包括相同信息的预定数量的信号流; 对每个信号流应用线性过程，每个流的过程具有不同的频率特性; 对信号流施加共享的干扰抑制。

公开(公告)号：US20240405830A1

公开(公告)日：2024-12-05

申请号：US18699432

申请日：2021-10-25

Applicant: NOKIA SOLUTIONS AND NETWORKS OY

Inventor： Nuan SONG ,  Stefan WESEMANN ,  Olli Juhani PIIRAINEN ,  Rana Ahmed SALEM ,  Tao YANG ,  Yan ZHAO

IPC: H04B7/06

Abstract: Embodiments of the present disclosure relate to a beamforming solution for MIMO communication. The method implemented at a first device comprises: obtaining: a signature vector corresponding to a beam which is in a first direction from the first device to a second device, and a first channel covariance matrix associated with a transmission from the first device to the second device. The method further comprises generating, based on the signature vector and the first channel covariance matrix, a beamforming matrix to be used for the transmission from the first device to the second device. In this way, the accuracy of the beamforming matrix is improved and the calculation amount for the beamforming matrix is reduced.

公开(公告)号：US20190190756A1

公开(公告)日：2019-06-20

申请号：US16285518

申请日：2019-02-26

Applicant: Nokia Solutions and Networks Oy

Inventor： Olli Juhani PIIRAINEN ,  Shirish NAGARAJ

IPC: H04L27/26

Abstract: A method and apparatus are 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 subspace 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 subspace for different frequency bins.

公开(公告)号：US20170250704A1

公开(公告)日：2017-08-31

申请号：US15513250

申请日：2014-09-25

Applicant: Nokia Solutions and Networks Oy

Inventor： Olli Juhani PIIRAINEN

IPC: H03M7/24 ,  H03M7/30

CPC classification number: H03M7/24 ,  H03M7/30

Abstract: There is provided a method for uplink data compression, the method including transforming a signal from a time-domain presentation into a frequency-domain presentation, selecting a group of adjacent frequency bins from the frequency-domain presentation, generating a floating point number representation from values of the group of adjacent frequency bins, wherein the floating point number representation includes a mantissa for each of the frequency bins' values of the group of adjacent frequency bins, and wherein the floating point number representation further includes a common exponent shared between the mantissas, and outputting the mantissas of the floating point number representation, and the value of the common exponent shared between the mantissas of the floating point number representation.

公开(公告)号：US20220181791A1

公开(公告)日：2022-06-09

申请号：US17457486

申请日：2021-12-03

Applicant: Nokia Solutions and Networks Oy

Inventor： Sivarama VENKATESAN ,  Jaakko Eino Ilmari VIHRIÄLÄ ,  Olli Juhani PIIRAINEN ,  Markus MYLLYLÄ

IPC: H01Q21/06

Abstract: This specification relates to systems and methods for determining eigenvalues and eigenvectors of a covariance matrix, for example for use in eigen-beamforming in MIMO systems. According to a first aspect of this specification, there is describes a method comprising: receiving an input covariance matrix; and determining one or more eigenvalues and/or eigenvectors of the matrix iteratively using gradient ascent, wherein each iteration of the gradient ascent has a step size, μ, that maximises a Rayleigh quotient along the gradient.

公开(公告)号：US20170170998A1

公开(公告)日：2017-06-15

申请号：US15086777

申请日：2016-03-31

Applicant: NOKIA SOLUTIONS AND NETWORKS OY

Inventor： Sathiaseelan SUNDARALINGAM ,  Srinivasan SELVAGANAPATHY ,  Muneender CHIRANJI ,  Olli Juhani PIIRAINEN

IPC: H04L25/03 ,  H04L1/08

CPC classification number: H04L25/03993 ,  H04B7/02 ,  H04B7/0845 ,  H04B7/0854 ,  H04B7/0857 ,  H04B7/0865 ,  H04L1/08

Abstract: Interference may affect numerous communication systems. Thus, certain wireless communication systems that rely on combining transmitted repetitions of information may benefit from interference removal techniques, such as those that provide pre-combiner interference removal. A method can include receiving, from a transmitter, multiple repetitions of a same information sent from the transmitter over a channel. The method can also include removing interference from the respective repetitions. The method can further include combining the interference-removed repetitions. The method can additionally include performing channel estimation based on the combined interference-removed repetitions. The method can also include retrieving information corresponding to the same information sent in the multiple repetitions based on the channel estimation and combined interference-removed repetitions.