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公开(公告)号：US11923911B2
公开(公告)日：2024-03-05
申请号：US17291850
申请日：2019-11-14
摘要： An underwater acoustic communication system includes a transmission device including N transmitters, and a reception device. The reception device includes M (M is an integer of two or more) receivers configured to receive M reception signal sequences corresponding to N transmission signal sequences transmitted from the N transmitters through sound waves, a beam former configured to suppress multipath waves other than direct waves of the M received reception signal sequences and to generate L (L is an integer of two or more) signal sequences from the M reception signal sequences, and a signal estimation unit configured to estimate the N transmission signal sequences based on the L generated signal sequences.
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公开(公告)号：US11888538B2
公开(公告)日：2024-01-30
申请号：US17774451
申请日：2019-11-12
摘要： A receiving apparatus includes: M receivers configured to receive signals based on sound waves propagating in water; M FIR filters configured to perform waveform operation on the signals received by the receivers; a combiner configured to combine output signals of the M FIR filters; and a filter coefficient calculation portion configured to calculate a tap coefficient of the M FIR filters so as to reduce an error of the output signals combined by the combiner. The M FIR filters have a tap length that is shorter than a delay spread that is a possible range between a time of arrival of a direct wave and a time of arrival of a delayed wave of the sound waves.
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公开(公告)号：US11477099B2
公开(公告)日：2022-10-18
申请号：US17434917
申请日：2020-03-10
IPC分类号： H04L43/0817 , G06F11/30
摘要： A monitoring system comprises a monitoring agent that keeps information related to a communication status of a low-power terminal that communicates under low power, and a monitoring device that monitors the status of the low-power terminal. The monitoring device includes a requesting unit that requests information related to the communication status of the low-power terminal. The monitoring agent includes a response generation unit that generates a response to the request from the monitoring device on a basis of the information related to the communication status of the low-power terminal, and a transmission unit that transmits the response to the monitoring device.
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公开(公告)号：US11991545B2
公开(公告)日：2024-05-21
申请号：US17437196
申请日：2020-03-02
IPC分类号： H04W16/18 , G06F17/10 , H04B1/00 , H04B7/14 , H04B17/318 , H04L43/0894 , H04W4/02 , H04W24/08
CPC分类号： H04W24/08 , H04B17/318 , H04L43/0894
摘要： An arrival rate estimation device includes an average received power calculation unit that calculates an average received power for each mesh that constitutes an area, with respect to each of a plurality of base stations and each of a plurality of antennas included in each of the base stations and an arrival rate estimation unit that calculates a communication arrival rate by substituting the average received power into a cumulative distribution function of an instantaneous received power value, and based on the calculated communication arrival rate, calculates a communication arrival rate while giving consideration to a site diversity effect and an antenna diversity effect, the cumulative distribution function being obtained from a probability density function of an amplitude that instantaneously changes due to Rayleigh fading.
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公开(公告)号：US20220014278A1
公开(公告)日：2022-01-13
申请号：US17291850
申请日：2019-11-14
摘要： An underwater acoustic communication system includes a transmission device including N transmitters, and a reception device. The reception device includes M (M is an integer of two or more) receivers configured to receive M reception signal sequences corresponding to N transmission signal sequences transmitted from the N transmitters through sound waves, a beam former configured to suppress multipath waves other than direct waves of the M received reception signal sequences and to generate L (L is an integer of two or more) signal sequences from the M reception signal sequences, and a signal estimation unit configured to estimate the N transmission signal sequences based on the L generated signal sequences.
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公开(公告)号：US20210266832A1
公开(公告)日：2021-08-26
申请号：US17254999
申请日：2019-06-05
发明人： Yosuke Fujino , Shigeru Teruhi , Kazunori Akabane
摘要： To further reduce power consumption in a wireless communication device that performs intermittent operations.
[Solution] Provided is a wireless communication system in which a first wireless device and a second wireless device intermittently perform wireless communication, in which the first wireless device repeatedly transmits an activation signal for activating the second wireless device at a first cycle until receiving a response signal from the second wireless device, the second wireless device repeatedly executes detection processing of the activation signal at a second cycle that is longer than the first cycle, receives, when a part of the activation signal is detected in the detection processing, the activation signal, transmits, when the activation signal is addressed to the second wireless device itself, the response signal to the first wireless device, the first wireless device transmits, when the response signal is received, data to the second wireless device, and the second wireless device receives, after transmitting the response signal, the data from the first wireless device.-
公开(公告)号：US12127231B2
公开(公告)日：2024-10-22
申请号：US17440960
申请日：2020-03-11
IPC分类号： H04W4/00 , H04W72/541
CPC分类号： H04W72/541
摘要： A communication control device that transmits a packet to be transmitted to a terminal to a base station that performs wireless communication with the terminal, includes: a terminal classification unit that classifies, on the basis of a magnitude of radio wave interference from a base station different from a neighboring base station, a plurality of the terminals into a first terminal set and a second terminal set that is relatively larger in the magnitude of radio wave interference than the first terminal set; and a transmission unit that transmits, in a case where packets destinations of which are terminals belonging to the first terminal set are to be transmitted to respective neighboring base stations of the terminals, the packets at the same timing and transmits, in a case where packets destinations of which are terminals belonging to the second terminal set are to be transmitted to respective neighboring base stations of the terminals, the packets at timings different from each other.
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公开(公告)号：US12063520B2
公开(公告)日：2024-08-13
申请号：US17596396
申请日：2019-06-13
CPC分类号： H04W16/18 , H04W64/003
摘要： A station installation designing assistance device that divides a service providing area into a plurality of areas, and performs station installation designing for the plurality of areas in parallel, the station installation designing assistance device including: an area dividing unit that divides an entirety of the service providing area into the plurality of areas; a station installation priority determining unit that determines, for each of the plurality of areas, station installation priorities of station installation location candidates that are present in the area; and a station installation priority adjusting unit that adjusts the station installation priorities determined by the station installation priority determining unit, based on a degree of overlap of cells formed as a result of base stations being installed in station installation location candidates in the areas, respectively.
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公开(公告)号：US11553421B2
公开(公告)日：2023-01-10
申请号：US17254999
申请日：2019-06-05
发明人： Yosuke Fujino , Shigeru Teruhi , Kazunori Akabane
IPC分类号： H04W52/02 , H04W76/28 , H04W84/18 , H04W4/38 , H04W28/06 , H04W74/06 , H04W74/08 , H04W76/14
摘要： Provided is a wireless communication system in which a first wireless device and a second wireless device intermittently perform wireless communication, in which the first wireless device repeatedly transmits an activation signal for activating the second wireless device at a first cycle until receiving a response signal from the second wireless device, the second wireless device repeatedly executes detection processing of the activation signal at a second cycle that is longer than the first cycle, receives, when a part of the activation signal is detected in the detection processing, the activation signal, transmits, when the activation signal is addressed to the second wireless device itself, the response signal to the first wireless device, the first wireless device transmits, when the response signal is received, data to the second wireless device, and the second wireless device receives, after transmitting the response signal, the data from the first wireless device.
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公开(公告)号：US11848727B2
公开(公告)日：2023-12-19
申请号：US17634207
申请日：2019-08-13
IPC分类号： H04K1/00 , H04L27/28 , H04B7/0456 , H04B7/06 , H04W28/02
CPC分类号： H04B7/0456 , H04B7/0632 , H04W28/0242 , H04W28/0284
摘要： A plurality of transmit antennas of a radio transmission device and a plurality of receive antennas of a radio reception device are located under the sea that is a line-of-sight environment, wherein the radio transmission device selects a frequency channel to be used based on an index value per frequency channel indicating orthogonality between the transmit and receive antennas defined based on a distance between the transmit and receive antennas and an angle indicating a direction of arrival of a radio signal, an interval between the plurality of transmit antennas, an interval between the plurality of receive antennas, and a modulation scheme, the distance between the transmit and receive antennas and the angle indicating the direction of arrival of the radio signal estimated by the radio reception device, and a desired bit error rate to be predetermined, selects the modulation scheme for providing a maximum transmission capacity per the selected frequency channel, separates transmission data into a plurality of pieces of transmission data the number of which corresponds to the number of frequency channels, modulates each of the plurality of pieces of transmission data separated in accordance with the selected modulation scheme, and outputs a transmission signal obtained by multiplexing, with a multiplexing order, each of the plurality of pieces of transmission data, the multiplexing order indicating the number of transmit antennas of the plurality of transmit antennas to be used.
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