公开(公告)号：US20220329274A1

公开(公告)日：2022-10-13

申请号：US17847930

申请日：2022-06-23

Applicant: Mitsubishi Electric Corporation

Inventor： Manabu SAKAI ,  Koji TOMITSUKA ,  Hiroki IURA

IPC: H04B1/10

Abstract: An interference cancellation device includes a data symbol extraction unit that extracts a data symbol portion from a received signal, a null symbol extraction unit that extracts a null symbol portion from the received signal, a data symbol power calculation unit that calculates a data symbol power estimated value, a null symbol power calculation unit that calculates a null symbol power estimated value, a null symbol spectrum calculation unit that calculates a null symbol spectrum from a null symbol signal, and an interference center frequency estimation unit that eliminates the effect of an image for an interference in calculation of an interference bandwidth when is calculating an interference center frequency estimated value, using a data symbol signal, the data symbol power estimated value, the null symbol power estimated value, and the null symbol spectrum.

公开(公告)号：US20200259536A1

公开(公告)日：2020-08-13

申请号：US16756075

申请日：2017-12-07

Applicant: MITSUBISHI ELECTRIC CORPORATION

Inventor： Hiroki IURA

IPC: H04B7/0456 ,  H04B7/06 ,  H04B7/08

Abstract: A wireless device according to the present invention is configured to execute a beamforming weight training function for acquiring in advance, by mutual communication between a base station and a terminal station, transmission quality information at a time when a combination of a base station beamforming weight and a terminal station beamforming weight is used, and identifying a suitable beamforming weight, and is configured to search for, based on the transmission quality information identified in the training step, a suitable beamforming weight while performing mutual communication, and execute processing of updating the suitable beamforming weight.

公开(公告)号：US20190393999A1

公开(公告)日：2019-12-26

申请号：US16466999

申请日：2016-12-07

Applicant: MITSUBISHI ELECTRIC CORPORATION

Inventor： Fumihiro HASEGAWA ,  Akinori TAIRA ,  Shigeru UCHIDA ,  Noriyuki FUKUI ,  Akihiro OKAZAKI ,  Hiroki IURA

IPC: H04L5/00

Abstract: A base station includes: a control unit that allocates one or more layers per terminal for transmission to one or more terminals, and configures positions in a frequency domain and a time domain of reference signals of each of the layers on the basis of at least one of information indicating a position of each of the terminals and information indicating condition of each of channel between the transmission device and the one or more terminals; a processing unit that arranges the reference signals of each of the layers in the frequency domain and the time domain on the basis of the positions in the frequency domain and the time domain configured by the control unit; and a precoding unit and a transmitting unit that perform space-division multiplexing on signals of one or more layers arranged by the processing unit, and transmit the multiplexed signals.

公开(公告)号：US20180123667A1

公开(公告)日：2018-05-03

申请号：US15566380

申请日：2015-08-05

Applicant: Mitsubishi Electric Corporation

Inventor： Akinori TAIRA ,  Shigeru UCHIDA ,  Hiroki IURA

IPC: H04B7/06 ,  H04B7/04 ,  H04B7/0417 ,  H04B1/04

CPC classification number: H04B7/0626 ,  H04B1/0475 ,  H04B7/0417 ,  H04B7/0465 ,  H04B7/0619 ,  H04B7/0634 ,  H04B2001/0433 ,  H04J11/00 ,  H04L27/2615 ,  H04L27/2646

Abstract: A radio transmission apparatus includes a plurality of antennas each having an amplifier, a transmission signal generation unit (modulation units, S/P units, and FFT units) which generates a signal to be transmitted to a terminal via the antennas, and a weighting processing unit (a precoder unit, a maximum power calculation unit, and multipliers) which executes a weighting process on a signal to be transmitted to the terminal, which has been generated by the transmission signal generation unit, based on channel state information between the radio transmission apparatus and the terminal and an output limit value of the amplifier.

公开(公告)号：US20170288910A1

公开(公告)日：2017-10-05

申请号：US15512684

申请日：2015-10-01

Applicant: Mitsubishi Electric Corporation

Inventor： Hiroki IURA

IPC: H04L25/02 ,  H04J1/02 ,  H04W72/04

CPC classification number: H04L25/022 ,  H04B7/10 ,  H04J1/02 ,  H04L25/0224 ,  H04L25/0232 ,  H04L25/03343 ,  H04W72/0453

Abstract: A wireless communication apparatus configured to select an allocation system for transmission symbols on the basis of transmission line situations between the wireless communication apparatus and terminals includes a channel estimator to estimate transmission line coefficients between communication target terminals and sub-arrays, a resource scheduler to generate, on the basis of the transmission line coefficients, mapping information and transmission weight information by spatial multiplexing and frequency multiplexing and select and output the mapping information and the transmission weight information by one of the multiplexing systems, a symbol mapper to map transmission symbols on a frequency axis on the basis of the mapping information from the resource scheduler, and a pre-coder to perform, on the basis of the transmission weight information from the resource scheduler, a weighting operation concerning a signal mapped by the symbol mapper.

公开(公告)号：US20210135805A1

公开(公告)日：2021-05-06

申请号：US17144700

申请日：2021-01-08

Applicant: MITSUBISHI ELECTRIC CORPORATION

Inventor： Fumihiro HASEGAWA ,  Akinori TAIRA ,  Shigeru UCHIDA ,  Noriyuki FUKUI ,  Akihiro OKAZAKI ,  Hiroki IURA

IPC: H04L5/00

Abstract: A base station includes: a control unit that allocates one or more layers per terminal for transmission to one or more terminals, and configures positions in a frequency domain and a time domain of reference signals of each of the layers on the basis of at least one of information indicating a position of each of the terminals and information indicating condition of each of channel between the transmission device and the one or more terminals; a processing unit that arranges the reference signals of each of the layers in the frequency domain and the time domain on the basis of the positions in the frequency domain and the time domain configured by the control unit; and a precoding unit and a transmitting unit that perform space-division multiplexing on signals of one or more layers arranged by the processing unit, and transmit the multiplexed signals.

公开(公告)号：US20200052840A1

公开(公告)日：2020-02-13

申请号：US16490450

申请日：2017-04-27

Applicant: Mitsubishi Electric Corporation

Inventor： Fumihiro HASEGAWA ,  Akinori TAIRA ,  Hiroki IURA ,  Shigeru UCHIDA ,  Mitsuru MOCHIZUKI ,  Tadahiro SHIMODA

IPC: H04L5/00 ,  H04W72/04

Abstract: The base station allocates, to one terminal, at least one transmission layer and allocates at least one resource block that is a minimum allocation unit of a communication resource in each transmission layer, to transmit a signal to the terminal, and includes processing units each associated with one of the transmission layers, the processing units being equal in number to the transmission layers. Each processing unit includes a reference signal generation unit to generate a reference signal to be used by the terminal in demodulation processing on a received signal, and an information processing unit to determine an arrangement of the resource block in which to transmit the reference signal to the terminal, based on at least one of a state of a channel between the base station and the terminal or information on the resource block to be used in transmission of the reference signal in an adjacent cell.

公开(公告)号：US20190020435A1

公开(公告)日：2019-01-17

申请号：US16069591

申请日：2016-02-22

Applicant: MITSUBISHI ELECTRIC CORPORATION

Inventor： Hiroshi NISHIMOTO ,  Hiroki IURA ,  Akinori TAIRA

IPC: H04J11/00 ,  H04B7/0452 ,  H04B7/0456

Abstract: A base station serving as a transmission apparatus includes a plurality of transmission antennas capable of forming beams directed to a plurality of terminals, which are reception apparatus, and a precoder configured to perform outer precoding on transmission signals transmitted from the plurality of transmission antennas. The plurality of terminals include at least one first reception apparatus, which are transmission destinations of the transmission signals, and second reception apparatus, which are reception apparatus other than the first reception apparatus. The precoder performs outer precoding on the transmission signals transmitted from the plurality of transmission antennas so that received power in the second reception apparatus among the plurality of reception apparatus is equal to or less than a threshold.

公开(公告)号：US20180287678A1

公开(公告)日：2018-10-04

申请号：US15562784

申请日：2015-04-15

Applicant: Mitsubishi Electric Corporation

Inventor： Kazunari KIHIRA ,  Makoto MATSUKI ,  Hikaru WATANABE ,  Hiroki IURA ,  Masataka OTSUKA

IPC: H04B7/06 ,  H01Q3/34 ,  H01Q1/52 ,  H04B7/0452 ,  H04B7/0408 ,  H01Q3/28

CPC classification number: H04B7/0617 ,  H01Q3/26 ,  H01Q21/06 ,  H01Q21/24 ,  H04B7/0408 ,  H04B7/0452 ,  H04B7/0697 ,  H04B7/10

Abstract: A sub-array number determinator is provided to determine a number of sub-arrays to be allocated to each of user terminals detected by a terminal position detector on a basis of relation between positions of the user terminals and a position of an antenna apparatus. An antenna selector selects sub-arrays for the number determined by the sub-array number determinator from among the sub-arrays and allocates the selected sub-arrays for the determined number to each of the user terminals. This structure is capable of preventing interference among beams for user terminals and providing excellent communication quality to the user terminals even in condition where the user terminals are adjacent to each other.