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公开(公告)号：US12057898B2
公开(公告)日：2024-08-06
申请号：US17797883
申请日：2020-03-02
IPC分类号： H04B7/04 , H04B7/0413 , H04L25/02 , H04L27/26
CPC分类号： H04B7/0413 , H04L25/0212 , H04L27/2607
摘要： A transmission apparatus including the number of antennas different from a reception apparatus and performing transmission by SC-MIMO to and from the reception apparatus includes a training signal generation unit that generates a known signal predetermined, a CP addition unit that adds a CP to each symbol of a transmission signal including the known signal, a weight generation unit that generates a transmission weight based on a transposed adjugate matrix that is a product of a channel matrix estimated based on the known signal by the reception apparatus and a complex conjugate transpose of the channel matrix, and a transmission beam formation unit that uses the transmission weight to form a transmission beam for the transmission signal where the CP is added.
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公开(公告)号：US11870517B2
公开(公告)日：2024-01-09
申请号：US17602192
申请日：2020-03-26
IPC分类号： H04B7/0456 , H04B7/005 , H04B7/06 , H04B7/08
CPC分类号： H04B7/0456 , H04B7/005 , H04B7/06 , H04B7/08
摘要： According to the present invention, in a wireless communication system that performs single carrier MIMO transmission between a transmitting station device and a receiving station device, the transmitting station device includes a time-domain linear equalization unit, a propagation path characteristics estimation unit configured to receive a training signal and estimate a transfer function matrix of propagation path characteristics, a filter tap calculation unit configured to calculate filter tap coefficients for the time-domain linear equalization unit based on the transfer function matrix by a predefined approach, and a transmission mode determination unit configured to make the filter tap calculation unit calculate the filter tap coefficients when the transfer function matrix meets a predefined condition, and to change a transmission mode and determine the transmission mode that meets the predefined condition when the transfer function matrix does not meet the predefined condition. The receiving station device includes a training signal generation unit configured to generate the training signal for use in estimation of propagation path characteristics and transmit the training signal to the transmitting station device.
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3.发明授权公开(公告)号：US11838167B2
公开(公告)日：2023-12-05
申请号：US17596064
申请日：2020-05-28
发明人： Hayato Fukuzono , Tomohiro Tokuyasu , Keita Kuriyama , Hiroyuki Furuya , Yu Ono , Tsutomu Tatsuta , Tomohiro Nakayama
摘要： Provided is a wireless communication system configured to accommodate a plurality of circuits to transmit a signal from a transmitter to a receiver, the system including a number-of-circuits observation unit configured to observe the number of circuits among the plurality of circuits through which communication is being performed; a quality observation unit configured to observe a quality of each of a plurality of communications; a determination unit configured to determine a modulation scheme for transmitting a signal based on the number of circuits observed by the number-of-circuits observation unit, the quality of each of the plurality of communications observed by the quality observation unit, and a required throughput of each of the plurality of circuits; and a modulation unit configured to modulate the signal using the modulation scheme determined by the determination unit.
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4.发明授权公开(公告)号：US11677597B2
公开(公告)日：2023-06-13
申请号：US17595055
申请日：2019-05-21
IPC分类号： H04L27/01
CPC分类号： H04L27/01
摘要： A wireless communication device includes an estimation observation unit that observes a channel condition by estimating a tendency of a long delay wave and a channel fluctuation from a received signal in which a training signal is added to a data frame, a first equalizer that compensates for the received signal, a second equalizer that compensates for the received signal with a property of having a higher long delay wave tolerance and a lower channel fluctuation tolerance than the first equalizer, and a control unit that performs control which switches such that the first equalizer or the second equalizer performs compensation for the received signal, on the basis of the channel condition observed by the estimation observation unit.
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公开(公告)号：US11489557B2
公开(公告)日：2022-11-01
申请号：US17433443
申请日：2020-02-19
发明人： Keita Kuriyama , Hayato Fukuzono , Tsutomu Tatsuta
IPC分类号： H04B7/005 , H04B1/04 , H04B7/0417 , H04L27/01
摘要： In the present invention, a transmitting station apparatus includes a training signal generation unit, a transmission end linear equalization unit configured to output a plurality of second data signals obtained by equalizing IAI of a plurality of first data signals by using a transmission end transfer function for equalizing IAI, and a transmitting station communication unit configured to transmit a training signal or the plurality of second data signals to a receiving station apparatus and receive information on the transmission end transfer function from the receiving station apparatus, and the receiving station apparatus includes a communication path estimation unit configured to estimate a communication path response from the training signal received by the receiving station communication unit, a reception end coefficient calculation unit configured to calculate the transmission end transfer function and a reception end transfer function for equalizing ISI, based on the communication path response, and a reception end linear equalization unit configured to output a plurality of third data signals obtained by equalizing ISI from the plurality of second data signals received by the receiving station communication unit by using the reception end transfer function.
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公开(公告)号：US12088374B2
公开(公告)日：2024-09-10
申请号：US17630227
申请日：2019-08-21
IPC分类号： H04B7/06 , H04B7/0452 , H04L27/26
CPC分类号： H04B7/0617 , H04B7/0452 , H04B7/0626 , H04L27/2607
摘要： A transmission station device includes a training signal generation unit, a CP addition unit, and a transmission beamforming unit that performs transmission beamforming processing in a time domain using a transmission weight for removing inter-antenna interference. A reception station device includes a CP removal unit, a channel estimation unit, and an equalization unit that performs equalization processing for removing inter-symbol interference in a frequency domain using a reception weight. Either of the transmission station device or the reception station device is provided with a weight calculation unit that calculates the transmission weight and the reception weight based on the channel response, an effective CIR length calculation unit that calculates an effective CIR length between antennas, and a CP length setting unit that sets, to the CP length, a maximum CIR length among the CIR lengths of respective items of the reception weight.
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公开(公告)号：US11929797B2
公开(公告)日：2024-03-12
申请号：US17797758
申请日：2020-03-02
IPC分类号： H04K1/10 , H04B7/0413 , H04L25/02 , H04L27/26 , H04L27/28
CPC分类号： H04B7/0413 , H04L25/0202 , H04L27/2607
摘要： A transmission apparatus including the number of antennas different from a reception apparatus and performing transmission by SC-MIMO to and from the reception apparatus includes a training signal generation unit that generates a known signal predetermined, a CP addition unit that adds a CP to each symbol of a transmission signal including the known signal, a weight generation unit that multiplies a channel matrix estimated based on the known signal by the reception apparatus by a pseudo-inverse matrix obtained by a predetermined number of iterative calculations to generate a transmission weight that is diagonalizable, and a transmission beam formation unit that uses the transmission weight to form a transmission beam for the transmission signal where the CP is added.
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公开(公告)号：US11843429B2
公开(公告)日：2023-12-12
申请号：US17602152
申请日：2020-03-26
IPC分类号： H04B7/02 , H04B7/0456
CPC分类号： H04B7/0456
摘要： According to the present invention, in a wireless communication system that performs single carrier MIMO transmission between a transmitting station device and a receiving station device, the transmitting station device including: a time-domain linear equalization unit configured to remove inter-symbol interference and inter-stream interference from a data signal to be transmitted to the receiving station device; a propagation path characteristics estimation unit configured to receive a training signal which is transmitted by the receiving station device and estimate a transfer function matrix of propagation path characteristics; and a filter tap calculation unit configured to calculate filter tap coefficients for the time-domain linear equalization unit by representing the estimated transfer function matrix as a matrix polynomial, taking an inverse response of the matrix polynomial as a transmit weight matrix, and approximating the transmit weight matrix with Neumann series, and the receiving station device including a training signal generation unit configured to generate the training signal for use in estimation of propagation path characteristics and transmit it to the transmitting station device.
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公开(公告)号：US20230275839A1
公开(公告)日：2023-08-31
申请号：US18008275
申请日：2020-06-08
发明人： Fumiaki Nagase , Keita Kuriyama , Yu Ono , Hitoshi Hasegawa , Hayato Fukuzono , Kazuo OSAKA , Hiroyuki Furuya , Masafumi YOSHIOKA , Toshifumi MIYAGI , Takafumi HAYASHI
IPC分类号： H04L47/24
CPC分类号： H04L47/24
摘要： To avoid uniform deterioration of the voice quality of all the calls sharing an IP phone line at a time of congestion. The congestion control method in an IP phone system includes a call state acquisition process of acquiring the number of simultaneous call sessions in one line shared by a plurality of IP phones. A congestion control method further includes a packet loss control process of setting a priority ranking to each call session and dynamically controlling packet loss rates of the call sessions in accordance with the number of the simultaneous call sessions and the priority ranking. In the packet loss control process, the packet loss rate is set lower for call sessions ranked higher in priority, and higher for call sessions ranked lower in priority.
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公开(公告)号：US11265056B2
公开(公告)日：2022-03-01
申请号：US17261148
申请日：2019-07-23
发明人： Hayato Fukuzono , Keita Kuriyama , Toshio Ito , Shuta Ueno , Masafumi Yoshioka , Tsutomu Tatsuta , Hiroyuki Nakamura
IPC分类号： H04L1/02 , H04B7/06 , H04B7/0452
摘要： A radio communication system includes a transmitting station, and at least one receiving apparatus. The transmitting station includes a plurality of modulation units configured to modulate a plurality of input data to generate first data signals in units of blocks having a predetermined data length, a subtraction unit configured to calculate, by using information acquired in advance and indicating a communication path response between the transmitting station and the receiving apparatus, information indicating directivity upon transmission of the first data signals of each of the plurality of modulation units, and predetermined information included in an additional signal to be added to a data signal, a delay wave component of the additional signal and subtract the delay wave component calculated, from each of the first data signals of the plurality of modulation units, to generate a plurality of second data signals, a beam forming unit configured to adjust, by using the information indicating directivity, power and a phase upon transmission of each of the plurality of second data signals to generate a plurality of third data signals, a plurality of adding units configured to add the additional signal to each of the plurality of third data signals to generate a plurality of fourth data signals, and a plurality of communication units configured to transmit the plurality of fourth data signals to the receiving apparatus.
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