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1.发明授权Catv system in which chanel selection signal is transmitted from the subscriber location 失效从用户位置发送通道选择信号的Catv系统
公开(公告)号：US5729281A
公开(公告)日：1998-03-17
申请号：US443699
申请日：1995-05-18
IPC分类号： H04H20/38 , H04H20/76 , H04H20/77 , H04H20/78 , H04H60/90 , H04N7/173 , H04N21/222 , H04N21/437 , H04N21/61 , H04N21/647 , H04N21/6587 , H04N7/14
摘要： A center station 1 generates an all-channel signal 2 obtained by multiplexing signals on all channels, and transmits the signals to a selective distribution station 10 through 1 wire transmission line such as an optical fiber. Subscribers' transmitting devices 40.sub.1 to 40.sub.N transmit requests for channels to be received by corresponding subscribers' receiving devices 30.sub.1 to 30.sub.N to the selective distribution station 10 in a radio transmission system. The selective distribution station 10 selects the signals on the channels requested from the all-channel signal 2 in response to requests to receive channels serving as up-signals transmitted in a radio transmission system from the subscribers' transmitting devices 40.sub.1 to 40.sub.N, and distributes and transmits the selected signals to the subscribers' receiving devices 30.sub.1 to 30.sub.N as down-signals.
摘要翻译： 中心站1产生通过在所有信道上复用信号而获得的全信道信号2，并且通过诸如光纤的1线传输线将信号发送到选择分配站10。 订户发送装置401〜40N向无线传送系统中的选择性分发站10发送要由相应的用户接收装置301〜30N接收的信道的请求。 选择分配站10响应于从用户的发送设备401到40N在无线电传输系统中发送的用作接收信道的信道的请求，选择从全信道信号2请求的信道上的信号，并且 将所选择的信号作为下行信号发送到用户接收装置301〜30N。
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公开(公告)号：US06271942B1
公开(公告)日：2001-08-07
申请号：US08978820
申请日：1997-11-26
IPC分类号： H04J1402
CPC分类号： H04B10/564 , H04B10/504 , H04B10/572 , H04B10/58
摘要： An oscillator outputs an additional signal with a frequency which is higher than a frequency corresponding to a bandwidth of a frequency band allotted to an electrical signal to be transmitted and lower than a half of a lowest frequency of a frequency band allotted to the electrical signal to be transmitted. Thereby, if a second order intermodulation distortion between the additional signal and the electrical signal to be transmitted occurs, a frequency where distortion occurs is outside all of the frequency bands allotted to the electrical signal to be transmitted, and the occurring second order intermodulation distortion does not affect the electrical signal to be transmitted. Further, if the second order intermodulation distortion of the additional signal occurs, the frequency where distortion occurs is outside all of the frequency bands allotted to the electrical signal to be transmitted, and the occurring second order intermodulation distortion does not affect the electrical signal to be transmitted. Not only noise and distortions caused by reflected optical signal but also OBI noise can be reduced by using the additional signal.
摘要翻译： 振荡器输出一个附加信号，该信号的频率高于分配给要发送的电信号的频带的带宽的频率，并且低于分配给电信号的频带的最低频率的一半， 被传送。 因此，如果发生附加信号和要发送的电信号之间的二阶互调失真，则发生失真的频率在分配给要发送的电信号的所有频带之外，并且发生的二阶互调失真 不影响要传输的电信号。 此外，如果发生附加信号的二阶互调失真，则发生失真的频率在分配给要发送的电信号的所有频带之外，并且发生的二阶互调失真不影响电信号 传输。 不仅可以通过使用附加信号来减少由反射光信号引起的噪声和失真，而且可以减少OBI噪声。
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3.发明授权
公开(公告)号：US5532865A
公开(公告)日：1996-07-02
申请号：US526578
申请日：1995-09-11
IPC分类号： H04B10/155 , H04J14/02 , H04B10/06 , H04B10/04
CPC分类号： H04J14/02 , H04B10/506 , H04B10/564 , H04B10/572
摘要： In a fiber optic communication terminal composed of a light mixing part for mixing an input light signal and a light signal from own station, a detecting part for picking up a part of the output of the light mixing part to detect its quality deterioration, and a light source part in which the wavelength of output light is variable, increase of noise level or occurrence of bit error due to beat interference caused by mixing of input light signal and light signal from the own station is detected as quality deterioration in the detecting part, and by controlling the wavelength of the light source part accordingly, generation of beat interference can be prevented, and moreover by using a fiber optic communication terminal capable of maintaining the wavelength so that the signal quality may be the set value, the output light wavelength can be arranged at high density on the whole as a fiber optic communication system.
摘要翻译： 在由用于混合输入光信号的光混合部分和来自本站的光信号组成的光纤通信终端中，检测部分用于拾取光混合部分的输出的一部分以检测其质量劣化，以及 作为检测部的质量恶化，检测输出光的波长可变的光源部分，噪声电平的增加或由于输入光信号的混合引起的拍频干扰和来自本台的光信号的位误差的发生， 并且通过相应地控制光源部分的波长，可以防止产生拍频干扰，此外，通过使用能够保持波长的光纤通信终端，使得信号质量可以是设定值，输出光波长可以 作为光纤通信系统，整体上以高密度排列。
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4.发明授权Method for measuring distance between reflection points along light transmission line and reflectance thereof 失效测量沿光传输线的反射点之间的距离及其反射率的方法
公开(公告)号：US5644389A
公开(公告)日：1997-07-01
申请号：US557478
申请日：1995-11-14
IPC分类号： G01M11/02 , G01M11/00 , H04B10/07 , H04B10/077 , H04B10/079 , H04B10/54 , G01N21/88
CPC分类号： G01M11/333 , G01M11/335
摘要： A signal for which the amplitude of envelope becomes substantially 0 only for a certain period of time within the time of a period T, and a measured signal having a certain amplitude are synthesized, and the synthesized signal is optically transmitted. When a plurality of reflection points are present on a light transmission line, there is an increase in harmonic distortion or intermodulation distortion as well as in cross modulation distortion after receiving. This increase in cross modulation distortion causes an increase in variation of amplitude of the measured signal. In such a case, it is possible to calculate the distance between, and/or reflectance of, reflection points present on end faces of optical elements and/or connecting points of optical fibers on the light transmission line by investigating first periodical characteristics of variation of the transmitted measured signal during transmission relative to the change in central light frequency of the signal light, or investigating second periodical characteristics of variation of the transmitted measured signal during transmission corresponding to the change in the frequency of the measured signal.
摘要翻译： 在周期T的时间内，信号的幅度变为基本为0的信号在一段时间内被合成，并且合成具有一定幅度的测量信号，并且合成信号被光学传输。 当在光传输线上存在多个反射点时，谐波失真或互调失真以及接收后的交叉调制失真增加。 交叉调制失真的这种增加导致测量信号的幅度变化的增加。 在这种情况下，可以通过调查光传输线上的光学元件的端面和/或光纤的连接点上的反射点之间的距离和/或反射率来计算第一周期特性 在传输期间发射的测量信号相对于信号光的中心光频率的变化，或者调查在传输期间发射的测量信号的变化的第二周期特性，对应于测量信号的频率的变化。
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5.发明授权
公开(公告)号：US5850303A
公开(公告)日：1998-12-15
申请号：US775247
申请日：1996-12-30
IPC分类号： H04B10/155 , H04J14/02 , H04B10/04
CPC分类号： H04J14/02 , H04B10/504 , H04B10/506 , H04J14/0224
摘要： A signal processing circuit 113 subjects a transmission signal outputted from a signal source 111 and a carrier outputted from a carrier generation circuit 112 to predetermined signal processing, to generate a modulation signal amplitude-modulated by the transmission signal and so adapted that its envelop on the high level side (or on the low level side) has a shape analogous to the waveform of the transmission signal and its envelope on the low level side (or on the high level side) is at an approximately constant level. A light source 114 converts the modulation signal into a light intensity modulation signal, and outputs the light intensity modulation signal to an optical coupler 120. The above-mentioned signal processing is performed by the signal processing circuit 113, whereby the spectrum distribution of the light signal outputted from the light source 114 is dispersed, and the peak value of light spectra is decreased. The peak value of beat noise produced after receiving is proportional to the peak value of the light spectra, whereby the peak value of the beat noise is also decreased.
摘要翻译： 信号处理电路113对从信号源111输出的发送信号和从载波生成电路112输出的载波进行规定的信号处理，生成由发送信号进行了幅度调制的调制信号， 高电平侧（或低电平侧）具有与发送信号的波形类似的形状，并且其低电平侧（或高电平侧）的包络处于大致恒定的水平。 光源114将调制信号转换为光强度调制信号，并将光强度调制信号输出到光耦合器120.由信号处理电路113进行上述信号处理，由此光的频谱分布 从光源114输出的信号被分散，光谱的峰值减小。 接收后产生的拍噪噪声的峰值与光谱的峰值成比例，从而峰值噪声也降低。
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6.发明授权Method and system for extending coverage of WLAN access points via optically multiplexed connection of access points to sub-stations 失效用于通过接入点的光复用连接来扩展WLAN接入点覆盖范围的方法和系统公开(公告)号：US07650112B2
公开(公告)日：2010-01-19
申请号：US10530651
申请日：2003-10-17
申请人： Kuniaki Utsumi , Hiroaki Yamamoto , Kouichi Masuda , Tsutomu Niiho , Mariko Nakaso , Hiroyuki Sasai
发明人： Kuniaki Utsumi , Hiroaki Yamamoto , Kouichi Masuda , Tsutomu Niiho , Mariko Nakaso , Hiroyuki Sasai
IPC分类号： H04B7/15
CPC分类号： H04W4/18 , H04B10/25754 , H04W84/12 , H04W88/04 , H04W92/02
摘要： A SW (70) receives an Ethernet® signal from an outside of areas E and F. The SW (70) selects and outputs the obtained Ethernet® signal to any one of APs (91a to 91e) in accordance with a network structure managed by the SW (70). The AP (91a to 91e) converts the Ethernet® signal to an electrical signal type wireless LAN signal, which is in turn output to a main station (10). The main station (10) frequency-multiplexes the signal output from each of the APs (91a to 91e), and converts the signal to an optical signal, which is in turn output to sub-stations (20a and 20b). The sub-station (20a and 20b) transmits the signal transmitted from the main station (10) to a terminal in the form of a wireless radio wave. Thereby, when a plurality of communication areas are present, the accommodation capacity of an AP can be effectively utilized in each communication area.
摘要翻译： SW（70）从区域E和F的外部接收以太网（R）信号.SW（70）根据以下（a）所示的AP（91a至91e）中的任何一个选择并输出所获得的以太网（R）信号 SW（70）管理的网络结构。 AP（91a至91e）将以太网（R）信号转换为电信号型无线LAN信号，该电信号型无线LAN信号又输出到主站（10）。 主站（10）对从每个AP（91a至91e）输出的信号进行频率复用，并将该信号转换为光信号，该信号又输出到子站（20a和20b）。 子站（20a和20b）以无线电波的形式将从主站（10）发送的信号发送到终端。 因此，当存在多个通信区域时，可以在每个通信区域中有效地利用AP的容纳能力。
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公开(公告)号：US07460829B2
公开(公告)日：2008-12-02
申请号：US10530976
申请日：2004-07-22
申请人： Kuniaki Utsumi , Hiroaki Yamamoto , Kouichi Masuda , Tsutomu Niiho , Mariko Nakaso , Kazuo Tanaka , Hiroyuki Sasai
发明人： Kuniaki Utsumi , Hiroaki Yamamoto , Kouichi Masuda , Tsutomu Niiho , Mariko Nakaso , Kazuo Tanaka , Hiroyuki Sasai
IPC分类号： H04B7/185
CPC分类号： H04W52/143 , H04B10/25754 , H04W52/24 , H04W88/085
摘要： A wireless communication system capable of keeping a level of a wireless signal received by a relay apparatus within a predetermined dynamic range. In a control apparatus, a transmitting section converts a downstream electric signal into a downstream optical signal and transmits the downstream optical signal to the relay apparatus via an optical transmission path. The relay apparatus converts the received downstream optical signal into a downstream electric signal and transmits the downstream electric signal as a wireless signal to a wireless communication terminal from a transmitting/receiving antenna section. In the relay apparatus, a level adjustment section adjusts the level of the wireless signal transmitted by the relay apparatus such that the receiving level of the wireless signal received by the relay apparatus is kept within a predetermined range.
摘要翻译： 一种无线通信系统，其能够将中继装置接收到的无线信号的电平保持在规定的动态范围内。 在控制装置中，发送部将下行电信号转换为下行光信号，经由光传输路径将下行光信号发送给中继装置。 中继装置将接收到的下行光信号转换成下行电信号，并且将来自发送/接收天线部的无线信号的下行电信号发送到无线通信终端。 在中继装置中，电平调整部分调整由中继装置发送的无线信号的电平，使得由中继装置接收的无线信号的接收电平保持在预定范围内。
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公开(公告)号：US20060045054A1
公开(公告)日：2006-03-02
申请号：US10530651
申请日：2003-10-17
申请人： Kuniaki Utsumi , Hiroaki Yamamoto , Kouichi Masuda , Tsutomu Niiho , Mariko Nakaso , Hiroyuki Sasai
发明人： Kuniaki Utsumi , Hiroaki Yamamoto , Kouichi Masuda , Tsutomu Niiho , Mariko Nakaso , Hiroyuki Sasai
IPC分类号： H04Q7/24
CPC分类号： H04W4/18 , H04B10/25754 , H04W84/12 , H04W88/04 , H04W92/02
摘要： A SW (70) receives an Ethernet® signal from an outside of areas E and F. The SW (70) selects and outputs the obtained Ethernet® signal to any one of APs (91a to 91e) in accordance with a network structure managed by the SW (70). The AP (91a to 91e) converts the Ethernet® signal to an electrical signal type wireless LAN signal, which is in turn output to a main station (10). The main station (10) frequency-multiplexes the signal output from each of the APs (91a to 91e), and converts the signal to an optical signal, which is in turn output to sub-stations (20a and 20b) The sub-station (20a and 20b) transmits the signal transmitted from the main station (10) to a terminal in the form of a wireless radio wave. Thereby, when a plurality of communication areas are present, the accommodation capacity of an AP can be effectively utilized in each communication area.
摘要翻译： SW（70）从区域E和F的外部接收以太网（R）信号.SW（70）根据以下的方式选择并将获得的以太网（R）信号输出到任何一个AP（91a至91e） 具有由SW（70）管理的网络结构。 AP（91a至91e）将以太网（R）信号转换为电信号型无线LAN信号，该电信号型无线LAN信号又输出到主站（10）。 主站（10）对从每个AP（91a至91e）输出的信号进行频率复用，并将该信号转换为光信号，该光信号又输出到子站（20a和20b） 子站（20A和20b）以无线电波的形式将从主站（10）发送的信号发送到终端。 因此，当存在多个通信区域时，可以在每个通信区域中有效地利用AP的容纳能力。
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公开(公告)号：US20050266797A1
公开(公告)日：2005-12-01
申请号：US10530976
申请日：2004-07-22
申请人： Kuniaki Utsumi , Hiroaki Yamamoto , Kouichi Masuda , Tsutomu Niiho , Mariko Nakaso , Kazuo Tanaka , Hiroyuki Sasai
发明人： Kuniaki Utsumi , Hiroaki Yamamoto , Kouichi Masuda , Tsutomu Niiho , Mariko Nakaso , Kazuo Tanaka , Hiroyuki Sasai
IPC分类号： H04B7/005 , H04B10/00 , H04B10/071 , H04B10/077 , H04B10/079 , H04B10/272 , H04J13/00 , H04W52/04 , H04W52/14 , H04W52/24 , H04W88/08 , H04W92/00 , H04B7/14
CPC分类号： H04W52/143 , H04B10/25754 , H04W52/24 , H04W88/085
摘要： The present invention is directed to a wireless communication system capable of keeping a level of a wireless signal received by a relay apparatus (20) within a predetermined dynamic range. In a control apparatus (10), a transmitting section (102) converts a downstream electric signal into a downstream optical signal and transmits the downstream optical signal to the relay apparatus (20) via an optical transmission path (40). The relay apparatus (20) converts the received downstream optical signal into a downstream electric signal and transmits the downstream electric signal as a wireless signal to a wireless communication terminal (30) from a transmitting/receiving antenna section (204). In the relay apparatus (20), a level adjustment section (207) adjusts the level of the wireless signal transmitted by the relay apparatus (20) such that the receiving level of the wireless signal received by the relay apparatus is kept within a predetermined range.
摘要翻译： 本发明涉及能够将由中继装置（20）接收的无线信号的电平保持在规定动态范围内的无线通信系统。 在控制装置（10）中，发送部（102）将下行电信号转换为下行光信号，经由光传输路径（40）将下行光信号发送给中继装置（20）。 中继装置（20）将接收到的下行光信号转换为下行电信号，并将发送/接收天线部（204）的下行电信号作为无线信号发送到无线通信终端（30）。 在中继装置（20）中，电平调整部（207）调整由中继装置（20）发送的无线信号的电平，使得由中继装置接收到的无线信号的接收电平保持在预定范围内 。
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公开(公告)号：US5875049A
公开(公告)日：1999-02-23
申请号：US803927
申请日：1997-02-24
CPC分类号： H03F3/08 , H03F3/45475 , H03F3/45982 , H04B10/6933
摘要： The present invention provides an amplifier capable of accurately reproducing a signal under various operating environments and an optical receiving circuit using the amplifier. The differential amplifier is constructed such that the amplification factor thereof is set to 0.5, and a variation occurring inside thereof is the same as a variation occurring inside of the differential amplifier. Respective output variations occurring in maximum value holding circuits due to a temperature variation and a power supply voltage variation are canceled by providing differential amplification in the differential amplifier. At this time, an output variation occurring in the differential amplifier is also canceled. Therefore, an output variation occurring in the differential amplifier is made equal in value to the output variation occurring in the differential amplifier, such that the same variation as a signal input is superimposed on the reference input fed to the differential amplifier. consequently, a reference input accurately following the DC level of the signal input can be fed to the differential amplifier, whereby stable amplification can always be provided.
摘要翻译： 本发明提供一种能够在各种操作环境下准确再现信号的放大器和使用放大器的光接收电路。 差分放大器被构造为使其放大系数设定为0.5，并且其内部的变化与差分放大器内部发生的变化相同。 通过在差分放大器中提供差分放大来消除由于温度变化和电源电压变化而在最大值保持电路中发生的各自的输出变化。 此时，差分放大器中出现的输出变化也被取消。 因此，使差分放大器中发生的输出变化值与差分放大器中出现的输出变化值相等，使得与馈送到差分放大器的参考输入相同的信号输入变化相加。 因此，准确跟随信号输入的DC电平的参考输入可以被馈送到差分放大器，由此可以总是提供稳定的放大。
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