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公开(公告)号：US10778365B2
公开(公告)日：2020-09-15
申请号：US16138289
申请日：2018-09-21
Inventor： Tomohiro Kimura , Yutaka Murakami , Mikihiro Ouchi
Abstract: A transmission device includes: a first mapper that maps a first bit stream of a first data series to generate a first modulated symbol stream of the first data series; a second mapper that maps a second bit stream of a second data series to generate a second modulated symbol stream of the second data series; a converter that subjects the second modulated symbol stream to conversion in accordance with the first modulated symbol stream; a superposition unit that superposes the first modulated symbol stream and the second modulated symbol stream at a predetermined amplitude ratio to generate a multiplexed signal, the second modulated symbol stream having been subjected to the conversion in accordance with the first modulated symbol stream; and a transmitter that transmits the multiplexed signal.
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公开(公告)号：US10707941B2
公开(公告)日：2020-07-07
申请号：US15738426
申请日：2016-06-15
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
Abstract: An indicator in a master AP from among a plurality of APs obtains communication quality of communication with an AP which is a communication partner. In the case where the obtained communication quality is less than a threshold, the indicator causes the plurality of APs including the master AP to perform cooperative operation to transmit data. In the case where the obtained communication quality is not less than the threshold, the indicator causes the plurality of APs including the master AP to stop the cooperative operation.
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公开(公告)号：US10693502B2
公开(公告)日：2020-06-23
申请号：US15928903
申请日：2018-03-22
Inventor： Yutaka Murakami
Abstract: An encoding method changes an encoding rate of an erasure correcting code. One cycle is defined as 12k bits (wherein k represents a natural number) which is an encoding output using LDPC-CC with an encoding rate of 1/2, and includes information and parity. From the one cycle, only the information is arranged in the output order of the encoding output to obtain 6k bit information X6i, X6i+1, X6i+2, X6i+3, X6i+4, X6i+5, . . . , X6(i+k−1) X6(i+k−1)+1, X6(i+k−1)+2, X6(i+k−1)+3, X6(i+k−1)+4, and X6(i+k−1)+5. Known information is inserted in 3k pieces of information (Xj) among the 6k bit information, so that when 3k pieces of mutually different j is divided by 3, there is a remainder of 0 regarding k pieces, there is a remainder of 1 regarding k pieces, and there is a remainder of 2 regarding k pieces, to thereby obtain the parity from the information containing the known information.
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公开(公告)号：US10587327B2
公开(公告)日：2020-03-10
申请号：US16421198
申请日：2019-05-23
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC: H04B7/06 , H04B7/0452 , H04L1/06 , H04L1/00 , H04B7/0456 , H04L27/26 , H04B1/707 , H04L27/00
Abstract: A transmission apparatus includes M signal processors that respectively generate modulated signals directed to M reception apparatuses, M being an integer equal to or greater than 2, and an antenna section. Each signal processor modulates a first bit sequence made up of two bits to generate a first modulated signal and a second modulated signal, and modulates a second bit sequence made up of other two bits to generate a third modulated signal and a fourth modulated signal, in a case of transmitting multiple streams to a corresponding one of the M reception apparatuses. The antenna section includes a first antenna that transmits the first modulated signal and the third modulated signal and a second antenna that transmits the second modulated signal and the fourth modulated signal. At least either the signals transmitted from the first antenna or the signals transmitted from the second antenna are phase-changed signals.
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公开(公告)号：US20200052851A1
公开(公告)日：2020-02-13
申请号：US16658994
申请日：2019-10-21
Inventor： Yutaka Murakami , Masayuki Orihashi , Akihiko Matsuoka
IPC: H04L5/00 , H04B7/06 , H04W52/52 , H04L27/26 , H04L25/02 , H04L27/18 , H04L29/06 , H04L27/06 , H04L27/14 , H04L27/12 , H04L27/04 , H04L1/06
Abstract: A transmission apparatus includes a plurality of orthogonal frequency division multiplexing (OFDM) modulation signal generators, which generate a first OFDM modulation signal and a second OFDM modulation signal. The transmission apparatus also includes a transmitter that transmits the first OFDM modulation signal from a first antenna and the second OFDM modulation signal from a second antenna, in an identical frequency band. A reception apparatus is provided, which includes a plurality of antennas that receive a plurality of OFDM modulation signals; a plurality of OFDM demodulators that transform the plurality of OFDM modulation signals to a plurality of reception signals using Fourier transform; an estimator that outputs a distortion estimation signal using one or more symbols for demodulation included in the plurality of reception signals; and a demodulator that compensates for distortion of the reception signals using the distortion estimation signal and demodulates a data symbol included in the reception signals.
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Patent Agency Ranking
公开(公告)号：US10439689B2
公开(公告)日：2019-10-08
申请号：US16164265
申请日：2018-10-18
Inventor： Yutaka Murakami , Tomohiro Kimura , Mikihiro Ouchi
IPC: H04B7/0456 , H04B7/0413 , H04B7/0452 , H04B7/06
Abstract: Provided are M signal processors that respectively generate modulated signals for M reception apparatuses (where M is an integer equal to 2 or greater), a multiplexing signal processor, and N antenna sections (where N is an integer equal to 1 or greater). When transmitting multiple streams, each of the M signal processors generates two mapped signals, generates first and second precoded signals by precoding the two mapped signals, periodically changes the phase of signal points in the IQ plane with respect to the second precoded signal, outputs the phase-changed signal, and outputs the first precoded signal and the phase-changed second precoded signal as two modulated signals. When transmitting a single stream, each of the M signal processor outputs a single modulated signal. The multiplexing signal processor multiplexes the modulated signals output from the M signal processors, and generates N multiplexed signals. The N antenna sections respectively transmit the N multiplexed signals.
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公开(公告)号：US10305628B2
公开(公告)日：2019-05-28
申请号：US15266319
申请日：2016-09-15
Inventor： Yutaka Murakami , Katsuaki Abe , Masayuki Orihashi , Akihiko Matsuoka
Abstract: A transmission frame generating device generates a transmission frame. The generating device includes a control information signal generator which generates a modulation method control signal indicating a modulation method used for a data signal and an error correction method control signal indicating an error correction method used for the data signal and a frame former which forms the transmission frame by arranging a training signal, the data signal, the modulation method control signal and the error correction method control signal on a plurality of subcarriers on a frequency axis. The modulation method control signal being repeatedly and discretely arranged on a first multiple of the plurality of subcarriers on the frequency axis and the error correction method control signal being repeatedly and discretely arranged on a second multiple of the plurality of the subcarriers on the frequency axis.
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公开(公告)号：US10224963B2
公开(公告)日：2019-03-05
申请号：US15692679
申请日：2017-08-31
Inventor： Yutaka Murakami , Shutai Okamura
Abstract: Disclosed are an encoder, a transmitting device, a coding method and a transmission method with which the transmission amount is reduced and a deterioration in transmission efficiency is suppressed while improving reception quality when QC-LDPC or a like block coding is used. A puncture pattern setting unit searches for a puncture pattern for each integral multiple of the number of columns or for each divisor of the number of columns of a sub block matrix that forms a check matrix (H) of a QC-LDPC code, and a puncture unit (data reduction unit) switches the puncture pattern for each integral multiple of the number of columns or for each divisor of the number of columns of the sub block matrix that forms the check matrix of the QC-LDPC code.
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公开(公告)号：US10158830B2
公开(公告)日：2018-12-18
申请号：US15685745
申请日：2017-08-24
Inventor： Yutaka Murakami
IPC: H04B7/00 , H04N7/173 , H04B1/3827 , H04W48/18 , H04W8/18 , H04W36/00 , H04W48/12 , H04W52/02 , H04W72/04 , H04W84/00 , H04W88/06
Abstract: Control circuitry in a terminal apparatus generates one or more groups, each group including a selected plurality of communication methods whose total value of specific absorption rates (SARs) is equal to or less than a threshold value, and generates group information indicating the one or more groups. N transmitters transmit transmission data to a plurality of communication stations that respectively support the plurality of communication methods included in one group that is indicated by the group information, by using corresponding communication methods.
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公开(公告)号：US10079625B2
公开(公告)日：2018-09-18
申请号：US15222934
申请日：2016-07-28
Inventor： Tomohiro Kimura , Yutaka Murakami , Mikihiro Ouchi
IPC: H04B7/0413 , H04B1/16 , H04W4/06 , H04W16/26 , H04W16/28 , H04B7/0404 , H04B7/06 , H04B7/08 , H04N21/2365 , H04N21/426 , H04B7/10
CPC classification number: H04B7/0413 , H04B1/16 , H04B7/0404 , H04B7/0697 , H04B7/0874 , H04B7/10 , H04N21/2365 , H04N21/42615 , H04N21/4263 , H04W4/06 , H04W16/26 , H04W16/28 , H04W76/40
Abstract: By a transmission method according to one aspect of the present disclosure, in a broadcasting system that generates a first broadcasting signal and a second broadcasting signal by performing multi-antenna encoding on program data, and wirelessly transmits a first broadcasting signal and a second broadcasting signal, a first transmit station transmits the first broadcasting signal, a second transmit station transmits the second broadcasting signal, the first transmit station and the second transmit station transmit the first broadcasting signal and the second broadcasting signal to an overlapping area at an identical time using an overlapping frequency band, polarized wave transmitted from the first transmit station differs from polarized wave transmitted from the second transmit station, and arrangement of the first transmit station differs from arrangement of the second transmit station.
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