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公开(公告)号：US10819404B2
公开(公告)日：2020-10-27
申请号：US16616681
申请日：2018-05-28
Applicant: NEC Corporation
Inventor： Jun Shikida , Naoto Ishii
IPC: H04B7/0456 , H04L25/02 , H04W16/28 , H04B17/318
Abstract: A wireless apparatus includes a first weight multiplication part, a channel estimation part, a channel response conversion part, and a second weight generation part. The first weight multiplication part includes first weights, each of which corresponds to an individual one of a plurality of beams, and multiplies a signal(s) corresponding to a reference signal(s) transmitted from a wireless terminal(s) by the first weights. The channel estimation part estimates first channel responses for the respective beams by using the signals obtained by the multiplication by the first weights. The channel response conversion part converts the first channel responses into second channel responses by using the first weights. The second weight generation part generates second weights used for wireless communication with the wireless terminal(s) by using the second channel responses.
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公开(公告)号：US10263730B2
公开(公告)日：2019-04-16
申请号：US15521844
申请日：2014-10-29
Applicant: NEC Corporation
Inventor： Boonsarn Pitakdumrongkija , Naoto Ishii
IPC: H04L1/00 , H04B7/0452 , H04L25/03 , H04B7/0456 , H04B7/06 , H04L5/00
Abstract: Provided a method in a mobile communication system comprising a base station adapted to create a precoding matrix for applying to data to be transmitted to a user terminal by using a channel estimate determined from a Reference Signal (RS) transmitted from the user terminal to the base station, the user terminal being adapted to transmit to the base station a Channel State Information (CSI) report, wherein the method comprises: the base station creating a relationship between the received CSI report and Interference pluses Noise covariance matrix that reflects amount of interference and noise observed at the user terminal's antennas, the base station determining the Interference pluses Noise covariance matrix based on the created relationship, and the base station using the determined Interference pluses Noise covariance matrix to estimate SINR for each data layer conditioned on the precoding matrix.
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23.发明授权公开(公告)号：US12052055B2
公开(公告)日：2024-07-30
申请号：US17870862
申请日：2022-07-22
Applicant: NEC CORPORATION
Inventor： Shinsuke Fujisawa , Naoto Ishii , Ankith Vinayachandran , Emmanuel Le Taillandier De Gabory , Fatih Yaman , Hussam G. Batshon
IPC: H04B10/2507 , H04B10/2543 , H04B10/61
CPC classification number: H04B10/2507 , H04B10/2543 , H04B10/6163
Abstract: An optical communication system includes a first terminal device configured to receive first data, wherein the first terminal device is configured to generate an optical waveform based on the received first data. The optical system further includes an optical communication path configured to receive the optical waveform from the first terminal device. The optical system further includes a second terminal device configured to receive the optical waveform from the optical communication path, wherein the second terminal device is configured to output second data based on the optical waveform. At least one of the first terminal device or the second terminal device includes a nonlinear waveform distortion compensation device. The nonlinear waveform compensation device is configured to correct nonlinear waveform distortion resulting from the optical waveform propagating along the optical communication path, and the nonlinear waveform compensation device includes at least one recursive intermediate layer.
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公开(公告)号：US11881970B2
公开(公告)日：2024-01-23
申请号：US17988951
申请日：2022-11-17
Applicant: NEC Corporation
Inventor： Kiyohiko Takahashi , Toshiki Takeuchi , Naoto Ishii
CPC classification number: H04L25/03019 , H04L27/265
Abstract: A signal detection unit detects, from a baseband signal of a received radio wave, two types of fixed signal sections that have different communication information and are present in sufficiently shorter time than a time period in which influence of fading fluctuates, and designate the detected two types of fixed signal sections as an information-1 section and an information-2 section. An information-1 section signal processing unit clips the information-1 section from the baseband signal, and performs Fourier transform on the clipped information-1 section. An information-2 section signal processing unit clips the information-2 section from the baseband signal, and performs Fourier transform on the clipped information-2 section. A feature value computation unit computes a feature value, based on an output of the information-1 section signal processing unit and an output of the information-2 section signal processing unit.
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公开(公告)号：US11489790B2
公开(公告)日：2022-11-01
申请号：US17123466
申请日：2020-12-16
Applicant: NEC CORPORATION
Inventor： Naoto Ishii , Jinsock Lee
Abstract: Provided is a mobile station which communicates with abase station using a radio channel, the mobile station comprising: a switching unit configured to switch from a packet reception period, during which packet reception can be executed, to a packet reception halt period, during which packet reception is halted; a transmission unit configured to transmit, to the base station, a result of receiving a packet sent from the base station, as a reception result notification signal; a packet reception determination unit configured to determine a packet reception fault; and a reception period determination unit configured to extend the packet reception period if the packet reception fault is determined by the packet reception determination unit.
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Patent Agency Ranking
公开(公告)号：US11418227B2
公开(公告)日：2022-08-16
申请号：US17282469
申请日：2019-08-27
Applicant: NEC Corporation
Inventor： Jun Shikida , Naoto Ishii
IPC: H04B1/10 , H04B7/0456 , H04B7/06 , H04B7/10 , H04L25/02
Abstract: A radio apparatus capable of reducing the amount of calculation required to suppress an interference signal is provided. A radio apparatus (1) includes a spatial transformation unit (2) configured to perform a spatial transformation on a received signal including a desired signal and an interference signal received by a plurality of antennas, and thereby calculate a first beam-space received signal vector, a beam selecting unit (3) configured to select at least two elements from the first beam-space received signal vector and generate a second beam-space received signal vector, and an interference suppression synthesis unit (4) configured to estimate a covariance matrix of an interference noise signal including a noise signal and the interference signal included in the second beam-space received signal vector, generate a reception weight by using this covariance matrix, and detect the desired signal based on the reception weight and the second beam-space received signal vector.
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27.发明授权公开(公告)号：US11251856B2
公开(公告)日：2022-02-15
申请号：US17228832
申请日：2021-04-13
Applicant: NEC Corporation
Inventor： Jun Shikida , Naoto Ishii
Abstract: A control apparatus includes a determination unit configured to determine first and second reception weight matrixes by using first and second channel matrixes between first and second radio apparatuses and the first and second terminals, a first calculation unit configured to calculate a data channel matrix of a data signal transmitted from the first radio apparatus to the first terminal by using the first channel matrix and the first reception weight matrix, a second calculation unit configured to calculate an interference channel matrix of interference to the second terminal caused by the first radio apparatus by using a third channel matrix between the first radio apparatus and the second terminal and the second reception weight matrix, and a third calculation unit configured to calculate a transmission weight matrix for transmitting a data signal so that the interference is suppressed by using the data channel matrix and the interference channel matrix.
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公开(公告)号：US11196468B2
公开(公告)日：2021-12-07
申请号：US17078595
申请日：2020-10-23
Applicant: NEC CORPORATION
Inventor： Jun Shikida , Naoto Ishii
IPC: H04B7/0456 , H04L5/00
Abstract: A control apparatus includes a calculation unit configured to calculate, for each of radio apparatuses, a combination of a pre-coding weight and a post-coding weight using a first channel information matrix based on estimated values of channel responses between each of the radio apparatuses and each of terminals, a selection unit configured to select one combination from the combinations calculated using the first channel information matrices as a first combination, and an orthogonalization unit configured to generate a second channel information matrix for each of the radio apparatuses by projecting each first channel information matrix onto the subspace that is orthogonal to the post-coding weight included in the first combination. The calculation unit calculates a combination for each of the radio apparatuses using a second channel information matrix, and the selection unit selects one combination from the combinations calculated using the second channel information matrix as a second combination.
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公开(公告)号：US10992499B2
公开(公告)日：2021-04-27
申请号：US17043308
申请日：2019-01-30
Applicant: NEC CORPORATION
Inventor： Jun Shikida , Kazushi Muraoka , Naoto Ishii
Abstract: A radio apparatus (10) includes an estimation unit (2) configured to calculate an estimated value of a channel response for each of a plurality of antennas, a padding unit (3) configured to generate a first antenna-space channel vector having dimensions larger than the number of the antennas by combining the estimated value with a padding value, a spatial transformation unit (4) configured to calculate a first beam-space channel vector by spatial transforming the first antenna-space channel vector, a noise suppression unit (5) configured to generate a second beam-space channel vector by suppressing at least one element of the first beam-space channel vector, an inverse spatial transformation unit (6) configured to calculate a second antenna-space channel vector by inversely and spatial transforming the second beam-space channel vector, and an extraction unit (7) configured to determine an estimated value of each channel based on the second antenna-space channel vector.
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公开(公告)号：US10700999B2
公开(公告)日：2020-06-30
申请号：US16194170
申请日：2018-11-16
Applicant: NEC CORPORATION
Inventor： Naoto Ishii , Jinsock Lee
IPC: H04W76/28 , H04L12/939 , H04L1/18 , H04W52/02
Abstract: Provided is a mobile station which communicates with abase station using a radio channel, the mobile station comprising: a switching unit configured to switch from a packet reception period, during which packet reception can be executed, to a packet reception halt period, during which packet reception is halted; a transmission unit configured to transmit, to the base station, a result of receiving a packet sent from the base station, as a reception result notification signal; a packet reception determination unit configured to determine a packet reception fault; and a reception period determination unit configured to extend the packet reception period if the packet reception fault is determined by the packet reception determination unit.
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