公开(公告)号：US20220376752A1

公开(公告)日：2022-11-24

申请号：US17743680

申请日：2022-05-13

Applicant: NEC Corporation

Inventor： Norifumi KAMIYA

IPC: H04B7/0456 ,  H04B1/10 ,  H04L25/02

Abstract: In order to achieve both of reduction of peak power and reduction of a transmission rate, an apparatus includes a reception processing unit configured to receive transmission signals from a transmission apparatus, the transmission apparatus performing precoding processing and clipping processing on the transmission signals and outputting a plurality of the transmission signals simultaneously in an identical frequency band; a signal separating unit configured to separate reception data sets from the transmission signals; and a transmission signal estimating unit configured to estimate a signal distortion component and a noise component due to the clipping processing and an interference component between the transmission signals, based on the reception data sets and gain information related to a channel for transmitting the transmission signals, and estimate transmission data sets by removing the signal distortion component, the noise component, and the interference component being estimated from the reception data sets.

公开(公告)号：US20210320707A1

公开(公告)日：2021-10-14

申请号：US17220241

申请日：2021-04-01

Applicant: NEC Corporation

Inventor： Norifumi KAMIYA

IPC: H04B7/06 ,  H04B17/309 ,  H04L25/02 ,  H04B17/29 ,  H04L27/26 ,  H04B7/0413

Abstract: An apparatus performs a discrete Fourier transform process on M×N received signal components included in a received signal, by a unit of N received signal components; and estimates an estimated signal containing M×N estimated signal components, which are estimated values of M×N transmission signal components, on the basis of the received signal on which the discrete Fourier transform process is performed. When the estimated signal xe is newly estimated, the apparatus performs an exclusion operation of excluding an estimated value xe(k) of the M transmission signal components that constitute a k-th transmission signal group from the estimated signal xe newly estimated, and updates the estimated value xe′ based on an intermediate signal xt(k) obtained by the exclusion operation and the received signal, thereby re-estimating the estimated signal xe.

公开(公告)号：US20190260398A1

公开(公告)日：2019-08-22

申请号：US16342584

申请日：2016-10-21

Applicant: NEC Corporation

Inventor： Prakash CHAKI ,  Norifumi KAMIYA

IPC: H03M13/00 ,  H03M13/13

Abstract: A communication device includes: an encoder that encodes an input vector to output a codeword of Polar Code; a memory configured to store a frozen set of positions of frozen bits and a puncturing set of positions of punctured bits; and at least one processor configured to execute a set of instructions to: a) set the frozen set such that a punctured bit has a constant value; b) select the position of a punctured bit such that a minimum number of indices get frozen; c) freeze an index that has a highest decoding error probability among a plurality of indices selected according to the step b); d) repeat the steps b) and c) a predetermined number of times to obtain an array of indices; and e) perform a bit-reversal permutation of the array obtained in the step d) to generate the positions of the punctured bits in the puncturing set.

公开(公告)号：US20240357428A1

公开(公告)日：2024-10-24

申请号：US18569276

申请日：2022-05-16

Applicant: NEC Corporation

Inventor： Norifumi KAMIYA ,  Mamoru SAWAHASHI

IPC: H04W28/18 ,  H04W16/26 ,  H04W72/0457

CPC classification number: H04W28/18 ,  H04W16/26 ,  H04W72/0457

Abstract: An information processing apparatus (10) includes: an acquisition unit (11) configured to acquire information regarding wireless communication of a back-haul link between a first base station (20A) and a second base station (20B) and information regarding wireless communication of an access link between the second base station and a user terminal; a control unit (12) configured to determine a first wireless communication method of the back-haul link and a second wireless communication method of the access link on the basis of the information acquired by the acquisition unit; and a transmission unit (13) configured to transmit information indicating the first wireless communication method determined by the control unit to at least one of the first base station or the second base station and transmit information indicating the second wireless communication method to at least one of the second base station or the user terminal.

公开(公告)号：US20220116244A1

公开(公告)日：2022-04-14

申请号：US17490278

申请日：2021-09-30

Applicant: NEC Corporation

Inventor： Norifumi KAMIYA

IPC: H04L25/02 ,  H04B7/0456 ,  H04B7/06

Abstract: A signal estimation apparatus classifies reception signal components included in a reception signal y and transmission signal components included in a transmission signal into a plurality of signal groups in accordance with a degree of a correlation between the reception signal component and the transmission signal component, on the basis of system information, sets, for each signal group, parameters β, ρ, τ and η that specifies a detail of a signal estimation method to be either one of a learned value that is learnable by a learning operation and a fixed value that is independent from the learning operation, and estimates, for each signal group, an estimation signal xe that is an estimated value of the transmission signal from the reception signal by using the signal estimation method specified by the set parameter.

公开(公告)号：US20190020384A1

公开(公告)日：2019-01-17

申请号：US16081076

申请日：2017-04-18

Applicant: NEC Corporation

Inventor： Norifumi KAMIYA

IPC: H04B7/0413 ,  H04L27/01 ,  H04L27/38

Abstract: A LOS-MIMO demodulation apparatus comprises a plurality of receive antennas that receive data; a phase noise estimation part that calculates, from each signal received, first phase noise information and second phase noise information relating to phase noise occurring at transmit antennas and the receive antennas; a first correction part that corrects a phase of each signal received by the plurality of receive antennas according to the first phase noise information; a frequency domain equalization part that performs frequency domain equalization processing compensating for distortion due to interference from each signal received; a second correction part that corrects, according to the second phase noise information, a phase of each signal obtained by returning the signals, on which the frequency domain equalization processing has been performed, to the time domain by performing an inverse discrete Fourier transform; and a decoding processing part that performs decoding processing on the corrected data.

公开(公告)号：US20240120965A1

公开(公告)日：2024-04-11

申请号：US18371675

申请日：2023-09-22

Applicant: NEC Corporation

Inventor： Norifumi KAMIYA ,  Eisaku Sasaki

IPC: H04B7/01 ,  H04B7/0456

CPC classification number: H04B7/01 ,  H04B7/0479

Abstract: A wireless communication system includes: a transmission apparatus that transmits a wireless signal including a plurality of wireless transmission signals, by using a plurality of transmitting antenna elements; and a reception apparatus that receives the wireless signal, as a plurality of wireless reception signals, by using a plurality of receiving antenna elements. The reception apparatus generates a plurality of separated reception signals by performing a signal separation process on the plurality of wireless reception signals, generates correlation information about the separated reception signals, and generates phase control information on the basis of the correlation information. The transmission apparatus generates the plurality of synthesized transmission signals by performing the signal synthesis process on the plurality of transmission signals, and adjusts the phase of each of the synthesized transmission signals, by a phase shift amount calculated on the basis of the phase control information.

公开(公告)号：US20220345163A1

公开(公告)日：2022-10-27

申请号：US17641187

申请日：2020-09-02

Applicant: NEC Corporation

Inventor： Masaaki TANIO ,  Norifumi KAMIYA ,  Naoto ISHII

IPC: H04B1/04 ,  G06N3/08

Abstract: A parameter determination apparatus (2) includes: a first learning device (2111) learning a weight between a [j−1]-th layer (j is an integer that satisfies a condition that “2≤j≤the number of the layer”) and a [j]-th layer to which an output of the [j−1]-th layer is inputted among a plurality of layers of a neural network; a selecting device (2112) selecting at least one valid path for each node included in the [j]-th layer from a plurality of connection paths that connect nodes in the [j−1]-th layer and nodes in the [j]-th layer, respectively, on the basis of the weight learned by the first learning device; and a second learning device (2113) learning at least one of the weight and a bias as the parameters relating to a network structure between the [j−1]-th layer and the [j]-th layer on the basis of the sample signal, the label signal and the valid path.

公开(公告)号：US20200092155A1

公开(公告)日：2020-03-19

申请号：US16471958

申请日：2016-12-21

Applicant: NEC CORPORATION

Inventor： Norifumi KAMIYA ,  Mamoru SAWAHASHI

IPC: H04L27/34

Abstract: A modulation device includes a mapping circuit configured to map information bits to signal points on a plurality of concentric rings, when a signal space arrangement in which the number of signal points on all of the plurality of rings is the same is used as a basis, reduce the number of signal points on an innermost ring or a plurality of rings from inner to outer rings from among the plurality of rings, generate a new ring outside the signal space arrangement used as the basis, and arrange, on the generated ring, signal points which achieve the same frequency utilization efficiency as that of the signal space arrangement used as the basis.

公开(公告)号：US20200052719A1

公开(公告)日：2020-02-13

申请号：US16497017

申请日：2017-03-30

Applicant: NEC Corporation

Inventor： Prakash CHAKI ,  Norifumi KAMIYA

IPC: H03M13/15 ,  H03M13/00

Abstract: A communication device includes: an encoder that encodes an input vector to output a codeword using a generator matrix of polar code; a memory that stores a frozen set including frozen bit indices and a non-frozen set including non-frozen bit indices; and a controller that is configured to: a) select at least one check bit index from the frozen set in descending order of row weights of the generator matrix and in descending order of index reliabilities of the input vector; b) select at least one non-frozen bit index from the non-frozen set to compute at least one check bit from at least one bit of information bits at the at least one non-frozen bit index; and c) put the at least one check bit at the at least one check bit index.