专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US11283527B2 Optical transmitting system, optical transmitting apparatus, optical receiving apparatus and transfer function estimating method 有权
公开(公告)号：US11283527B2
公开(公告)日：2022-03-22
申请号：US17311928
申请日：2019-12-04
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Masanori Nakamura , Fukutaro Hamaoka , Hiroshi Yamazaki , Munehiko Nagatani , Takayuki Kobayashi , Yutaka Miyamoto
IPC分类号： H04B10/04 , H04B10/58 , H04B10/69
摘要： An optical transmission system includes an optical transmitter and an optical receiver. The optical transmitter includes a low speed signal generation unit configured to generate, based on an input signal of a transmission data sequence and a signal obtained by cyclically shifting a spectrum of the input signal, a plurality of low speed signals, a high speed signal generation unit configured to digital-to-analog convert and synthesize the plurality of low speed signals to generate a high speed signal, and an optical modulation unit configured to transmit an optical signal obtained by modulation of the high speed signal to a transmission path. The optical receiver includes a reception unit configured to receive the optical signal from the transmission path and output the high speed signal obtained from the optical signal that is received, an optical-receiver-side high speed signal compensation unit configured to compensate, based on the high speed signal output by the reception unit and a signal obtained by cyclically shifting a spectrum of the high speed signal, for the high speed signal, and a reception data decoding unit configured to decode the high speed signal compensated by the optical-receiver-side high speed signal compensation unit to restore binary information included in the optical signal transmitted by the optical transmitter.

2. 发明授权

US10574430B2 Relay transmission system, relay transmission method, and relay transmission device 有权
公开(公告)号：US10574430B2
公开(公告)日：2020-02-25
申请号：US15770234
申请日：2016-10-25
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Daisuke Hisano , Tatsuya Shimada , Hiroshi Ou , Takayuki Kobayashi
IPC分类号： H04L5/14 , H04B10/25 , H04B10/2575 , H04B10/297 , H04L5/00
摘要： A relay transmission system includes a relay unit configured to relay uplink signals and downlink signals in the first and second communication systems, a time division duplex (TDD) information estimation unit configured to estimate a transmission period of network devices in the first communication system on the basis of the uplink or downlink signal of the first communication system that is relayed by the relay unit, a surplus bandwidth determination unit configured to determine a surplus bandwidth in which an uplink signal of the first communication system is not allocated to a relay target of the relay unit during the transmission period on the basis of the number of network devices and a maximum transmission capacity of the network devices, and a bandwidth allocation unit configured to allocate the uplink signal of the second communication system to the relay target of the relay unit in the surplus bandwidth.

3. 发明授权

US09667350B2 Optical receiving device and phase cycle reduction method 有权
公开(公告)号：US09667350B2
公开(公告)日：2017-05-30
申请号：US14758941
申请日：2014-01-24
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Kengo Horikoshi , Kohki Shibahara , Etsushi Yamazaki , Mitsuteru Yoshida , Koichi Ishihara , Takayuki Kobayashi , Yoshiaki Kisaka , Takuya Ohara , Masahito Tomizawa , Tomoyoshi Kataoka
IPC分类号： H04B10/60 , H04B10/61 , H04L27/06 , H04L27/38 , H04L7/00
CPC分类号： H04B10/6165 , H04L7/0041 , H04L7/0075 , H04L27/066 , H04L27/389
摘要： The optical receiving device with phase compensation apparatus uses coherent opto-electric conversion and is designed for receiving phase- or quadrature-amplitude-modulated optical signals. The phase compensation apparatus includes following elements: a carrier-phase estimation unit that estimates carrier phase errors in a received symbol string; a gain adjustment unit that adjusts weighting of each symbols in phase error evaluation performed in the carrier-phase adjustment unit; a phase-cycle-slip reduction unit with a phase-cycle-slip detector using statistical processing performed on the output symbols from the carrier-phase estimation unit; and a phase compensation circuit that compensates carrier phase errors of the received signal using an output from the carrier phase estimation unit.

4. 发明授权

US11632185B2 Signal processing method, signal processing apparatus and communication system 有权
公开(公告)号：US11632185B2
公开(公告)日：2023-04-18
申请号：US17433149
申请日：2020-01-31
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Takayuki Kobayashi , Masanori Nakamura , Fukutaro Hamaoka , Yutaka Miyamoto
IPC分类号： H04L27/01 , H04J14/06 , H04B10/2507 , H04B10/61 , H04L27/38
摘要： A receiver convolutes each of a real component and an imaginary component of each polarization of a polarization-multiplexed reception signal with an impulse response for compensating for frequency characteristics of the receiver and a complex impulse response for wavelength dispersion compensation, and generates, as input signals, the convoluted real component and imaginary component of each polarization and phase conjugations thereof, for each polarization. The receiver generates, for each polarization, a first addition signal obtained by multiplying each of the real component and the imaginary component of each polarization by a complex impulse response, thereafter adding together the multiplied real component and imaginary component, and applying a phase rotation for frequency offset compensation to the added components, and a second addition signal obtained by multiplying each of the phase conjugation of the real component of and the phase conjugation of the imaginary component of each polarization by a complex impulse response, thereafter adding together the multiplied phase conjugations, and applying a phase rotation opposite to the phase rotation for frequency offset compensation to the added phase conjugations, and adds or subtracts a transmission data bias correction signal to or from a signal obtained by adding together the generated first addition signal and second addition signal.

5. 发明授权

US09520947B2 Signal generating circuit, optical signal transmitting apparatus, signal receiving circuit, method for establishing optical signal synchronization, and optical signal synchronization system 有权
公开(公告)号：US09520947B2
公开(公告)日：2016-12-13
申请号：US14550262
申请日：2014-11-21
申请人： Nippon Telegraph and Telephone Corporation
发明人： Koichi Ishihara , Takayuki Kobayashi , Riichi Kudo , Yasushi Takatori , Munehiro Matsui , Masato Mizoguchi , Akihide Sano , Shogo Yamanaka , Etsushi Yamazaki , Yutaka Miyamoto , Eiji Yoshida , Tadao Nakagawa
IPC分类号： H04B10/06 , H04B10/50 , H04B10/079 , H04B10/2513 , H04B10/556 , H04B10/61 , H04L7/027
CPC分类号： H04B10/50 , H04B10/07951 , H04B10/2513 , H04B10/556 , H04B10/616 , H04B10/6161 , H04L7/027
摘要： To enable signal position detection, frequency offset compensation, clock offset compensation, and chromatic dispersion amount estimation in a communication system based on coherent detection using an optical signal, even on a signal having a great offset in an arrival time depending on a frequency due to chromatic dispersion. An optical signal transmitting apparatus generates specific frequency band signals having power concentrated on two or more specific frequencies and transmits a signal including the specific frequency band signals. An optical signal receiving apparatus converts a received signal into a digital signal, detects positions of the specific frequency band signals from the converted digital signal, estimates frequency positions of the detected specific frequency band signals, and detects a frequency offset between an optical signal receiving apparatus and an optical signal transmitting apparatus. Moreover, the optical signal receiving apparatus detects a clock offset between the optical signal receiving apparatus and the optical signal transmitting apparatus from an interval between the estimated frequency positions of the specific frequency band signals. Furthermore, the optical signal receiving apparatus estimates temporal positions of the detected specific frequency band signals and detects a chromatic dispersion amount from a difference between the temporal positions of the specific frequency band signals corresponding to different frequencies.

6. 发明申请

US20150078765A1 SIGNAL GENERATING CIRCUIT, OPTICAL SIGNAL TRANSMITTING APPARATUS, SIGNAL RECEIVING CIRCUIT, METHOD FOR ESTABLISHING OPTICAL SIGNAL SYNCHRONIZATION, AND OPTICAL SIGNAL SYNCHRONIZATION SYSTEM 审中-公开
公开(公告)号：US20150078765A1
公开(公告)日：2015-03-19
申请号：US14550262
申请日：2014-11-21
申请人： Nippon Telegraph and Telephone Corporation
发明人： Koichi Ishihara , Takayuki Kobayashi , Riichi Kudo , Yasushi Takatori , Munehiro Matsui , Masato Mizoguchi , Akihide Sano , Shogo Yamanaka , Etsushi Yamazaki , Yutaka Miyamoto , Eiji Yoshida , Tadao Nakagawa
IPC分类号： H04B10/61
CPC分类号： H04B10/50 , H04B10/07951 , H04B10/2513 , H04B10/556 , H04B10/616 , H04B10/6161 , H04L7/027
摘要： To enable signal position detection, frequency offset compensation, clock offset compensation, and chromatic dispersion amount estimation in a communication system based on coherent detection using an optical signal, even on a signal having a great offset in an arrival time depending on a frequency due to chromatic dispersion. An optical signal transmitting apparatus generates specific frequency band signals having power concentrated on two or more specific frequencies and transmits a signal including the specific frequency band signals. An optical signal receiving apparatus converts a received signal into a digital signal, detects positions of the specific frequency band signals from the converted digital signal, estimates frequency positions of the detected specific frequency band signals, and detects a frequency offset between an optical signal receiving apparatus and an optical signal transmitting apparatus. Moreover, the optical signal receiving apparatus detects a clock offset between the optical signal receiving apparatus and the optical signal transmitting apparatus from an interval between the estimated frequency positions of the specific frequency band signals. Furthermore, the optical signal receiving apparatus estimates temporal positions of the detected specific frequency band signals and detects a chromatic dispersion amount from a difference between the temporal positions of the specific frequency band signals corresponding to different frequencies.

7. 发明申请

US20150078762A1 SIGNAL GENERATING CIRCUIT, OPTICAL SIGNAL TRANSMITTING APPARATUS, SIGNAL RECEIVING CIRCUIT, METHOD FOR ESTABLISHING OPTICAL SIGNAL SYNCHRONIZATION, AND OPTICAL SIGNAL SYNCHRONIZATION SYSTEM 审中-公开
标题翻译：信号发生电路，光信号发送装置，信号接收电路，建立光信号同步的方法和光信号同步系统
公开(公告)号：US20150078762A1
公开(公告)日：2015-03-19
申请号：US14550424
申请日：2014-11-21
申请人： Nippon Telegraph and Telephone Corporation
发明人： Koichi Ishihara , Takayuki Kobayashi , Riichi Kudo , Yasushi Takatori , Munehiro Matsui , Masato Mizoguchi , Akihide Sano , Shogo Yamanaka , Etsushi Yamazaki , Yutaka Miyamoto , Eiji Yoshida , Tadao Nakagawa
IPC分类号： H04B10/50
CPC分类号： H04B10/50 , H04B10/07951 , H04B10/2513 , H04B10/556 , H04B10/616 , H04B10/6161 , H04L7/027
摘要： To enable signal position detection, frequency offset compensation, clock offset compensation, and chromatic dispersion amount estimation in a communication system based on coherent detection using an optical signal, even on a signal having a great offset in an arrival time depending on a frequency due to chromatic dispersion. An optical signal transmitting apparatus generates specific frequency band signals having power concentrated on two or more specific frequencies and transmits a signal including the specific frequency band signals. An optical signal receiving apparatus converts a received signal into a digital signal, detects positions of the specific frequency band signals from the converted digital signal, estimates frequency positions of the detected specific frequency band signals, and detects a frequency offset between an optical signal receiving apparatus and an optical signal transmitting apparatus. Moreover, the optical signal receiving apparatus detects a clock offset between the optical signal receiving apparatus and the optical signal transmitting apparatus from an interval between the estimated frequency positions of the specific frequency band signals. Furthermore, the optical signal receiving apparatus estimates temporal positions of the detected specific frequency band signals and detects a chromatic dispersion amount from a difference between the temporal positions of the specific frequency band signals corresponding to different frequencies.
摘要翻译：为了使基于使用光信号的相干检测的通信系统中的信号位置检测，频率偏移补偿，时钟偏移补偿和色散量估计，即使在到达时间上具有很大偏移的信号，这取决于由于色散。光信号发送装置产生具有集中在两个或更多个特定频率上的功率的特定频带信号，并发送包括特定频带信号的信号。光信号接收装置将接收到的信号转换为数字信号，检测来自转换的数字信号的特定频带信号的位置，估计检测到的特定频带信号的频率位置，并检测光信号接收装置和光信号发送装置。此外，光信号接收装置从特定频带信号的估计频率位置之间的间隔检测光信号接收装置和光信号发送装置之间的时钟偏移。此外，光信号接收装置估计检测到的特定频带信号的时间位置，并且根据与不同频率对应的特定频带信号的时间位置之间的差来检测色散量。

8. 发明授权

US10805905B2 Terminal station device and bandwidth allocation method 有权
公开(公告)号：US10805905B2
公开(公告)日：2020-10-13
申请号：US15562114
申请日：2016-03-28
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Hiroshi Ou , Tatsuya Shimada , Takayuki Kobayashi , Jun Terada
IPC分类号： H04W72/04 , H04L12/44
摘要： Information on allocation of a bandwidth of uplink communication of each of user devices is extracted from information notified from an upper-level device on the uplink communication of the user devices. Correspondence information is created to indicate a correspondence among the upper-level device, the terminal device, the lower-level device, and the user device. A start time point of the uplink communication of the terminal device and an information amount of signals for which transmission of the uplink communication of the terminal device is allowed are allocated to the terminal device on the basis of the information on allocation of the bandwidth of the uplink communication of each of the user devices and the correspondence information.

9. 发明授权

US10555330B2 Terminal station apparatus and band allocation method 有权
公开(公告)号：US10555330B2
公开(公告)日：2020-02-04
申请号：US16075205
申请日：2017-01-23
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Hiroshi Ou , Takayuki Kobayashi , Daisuke Hisano , Tatsuya Shimada
IPC分类号： H04W72/12 , H04L12/44 , H04J3/16 , H04W56/00 , H04W72/04
摘要： A terminal station device is a terminal station device of a communication system in which a high-order device, the terminal station device, an end-terminal device, and a low-order device are communicably connected in this order, the high-order device notifies the low-order device of resource information indicating a resource that is usable in communication, and thereby the resource is allocated to the low-order device. The terminal station device includes: a band allocation unit that allocates a band that is permitted to be used by the end-terminal device for transmission processing to the terminal station device, based on an interval at which the terminal station device has received the resource information.

10. 发明授权

US10038507B2 Optical transmission system, phase compensation method, and optical reception apparatus 有权
公开(公告)号：US10038507B2
公开(公告)日：2018-07-31
申请号：US14766635
申请日：2014-02-13
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Mitsuteru Yoshida , Etsushi Yamazaki , Seiji Okamoto , Hiroyuki Uzawa , Kengo Horikoshi , Koichi Ishihara , Takayuki Kobayashi , Yoshiaki Kisaka , Masahito Tomizawa , Naoki Fujiwara , Tomoyoshi Kataoka , Kazushige Yonenaga
IPC分类号： H04B10/61 , H04B10/2507 , H04L27/38 , H04B10/516 , H04J14/06 , H04L27/00
CPC分类号： H04B10/6165 , H04B10/2507 , H04B10/516 , H04B10/61 , H04J14/06 , H04L27/38 , H04L2027/0067 , H04L2027/0095
摘要： An increase in circuit scale is suppressed and a phase variation caused in a transmission path or the like is compensated for. An optical transmission system includes: a pilot symbol detection unit which detects a plurality of pilot symbols intermittently inserted into a received complex electric field signal that is obtained through coherent detection for a received optical signal; an error signal computation unit which calculates a complex electric field error signal indicating a phase variation at each pilot symbol based on the pilot symbols detected by the pilot symbol detection unit and a predetermined reference symbol; a compensation electric field signal generation unit which estimates a phase variation between the pilot symbols in the received complex electric field signal using filter processing based on the complex electric field error signal calculated by the error signal computation unit; and a phase noise compensation unit which performs phase compensation for the received complex electric field signal based on the phase variation between the pilot symbols estimated by the compensation electric field signal generation unit.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式