专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

121. 发明授权

US5930303A Digital modulation employing single sideband with suppressed carrier 失效
标题翻译：数字调制采用单载波抑制载波
公开(公告)号：US5930303A
公开(公告)日：1999-07-27
申请号：US963237
申请日：1997-11-03
申请人： Harold Walker
发明人： Harold Walker
IPC分类号： H03M5/08 , H03M5/12 , H03M5/14 , H04L25/49 , H04L25/493 , H04L27/02 , H04L27/04 , H04L27/10 , H04L27/18 , H04L27/20 , H03C1/52
CPC分类号： H04L25/493 , H03M5/08 , H03M5/12 , H04L25/4904 , H04L27/02 , H04L27/2025
摘要： A method for transmitting "biphase" encoded digital signals including the steps of setting an aperture corresponding to a data bit; dividing said aperture into a plurality of segments; setting a first segment, selected from said plurality of segments of said aperture, dependent upon whether the bit is a digital one or zero; setting a second segment, selected from said plurality of segments of said aperture, so as to fit the remaining aperture of the data bit; and, transmitting said first and second segments of said data bit; wherein a narrow spectrum results containing no low frequency components and separated from 0 Hz by an amount equal to the data rate or 1/2 the data rate.
摘要翻译：一种用于发送“双相”编码的数字信号的方法，包括以下步骤：设置对应于数据位的孔; 将所述孔分成多个段; 设置从所述孔的所述多个段中选择的第一段，取决于该位是数字位还是零; 设置从所述孔径的所述多个段中选择的第二段，以便适配数据位的剩余孔径; 以及发送所述数据位的所述第一和第二段; 其中窄频谱结果不包含低频分量，并且从0Hz分离等于数据速率的量或+ E，fra 1/2 + EE的数据速率。

122. 发明授权

US5841776A Apparatus and method for a high throughput fiber-optic access network using code division multiple access 失效
标题翻译：一种使用码分多址的高吞吐量光纤接入网的装置和方法
公开(公告)号：US5841776A
公开(公告)日：1998-11-24
申请号：US581700
申请日：1995-12-29
申请人： Howard Zehua Chen
发明人： Howard Zehua Chen
IPC分类号： H04J14/00 , H04L12/56 , H04L27/10 , H04Q11/04 , H04J13/00
CPC分类号： H04L27/10 , H04J14/005 , H04Q11/0478 , H04L2012/5616 , H04L2012/5675
摘要： A method and apparatus for implementation of a code division multiple access encoding scheme in a fiber-optic network. One preferred embodiment of the present invention provides an encoder and decoder for each terminal in the communications network, for example SONET OC-3, and allows each terminal to transmit their signals into the fiber-optic network at random. Because no time slot management is used, signals from all terminals interfere with one another. A coding technique is used by each decoder to sort its own signal out of this interference. The encoded data from each terminal is modulated with a technique known as MFSK (multiple frequency shift keying). The modulated signal is further used to intensity-modulate a semiconductor laser diode which may or may not be a single wavelength laser. At the receiver, the combined interference signal is first detected by a optical intensity detector and then sent to a frequency tone detectors which demodulate the MFSK signal. The output of the MFSK demodulator is then sent to a decoder where the original data bits are recovered. The network employs an optimum spread spectrum multiple access coding and modulation method that hops the subcarrier of a semiconductor laser diode over the entire range of DC -30 Ghz. Powerful concatenated Reed-Solomon outer, dual-K convolutional inner codes are used to minimize errors caused by mutual interference.
摘要翻译：一种用于在光纤网络中实现码分多址编码方案的方法和装置。本发明的一个优选实施例为通信网络中的每个终端（例如SONET OC-3）提供编码器和解码器，并且允许每个终端将它们的信号随机发送到光纤网络中。由于不使用时隙管理，来自所有终端的信号彼此干扰。每个解码器使用编码技术来对其自身的信号进行排序。来自每个终端的编码数据用称为MFSK（多频移键控）的技术进行调制。调制信号还用于强度调制半导体激光二极管，其可以是或不是单波长激光。在接收机处，组合干扰信号首先由光强度检测器检测，然后发送到解调MFSK信号的频率检测器。然后将MFSK解调器的输出发送到解码器，原始数据位被恢复。网络采用在DC -30 Ghz的整个范围内跳过半导体激光二极管的副载波的最佳扩频多址编码和调制方法。强大的串联Reed-Solomon外部双K卷积内码用于最大限度地减少相互干扰造成的误差。

123. 发明授权

US5812612A Method and apparatus for transmitting an intermittent signal in a ratio communication system 失效
标题翻译：用于在比率通信系统中发送间歇信号的方法和装置
公开(公告)号：US5812612A
公开(公告)日：1998-09-22
申请号：US544446
申请日：1995-11-17
申请人： Shin Saito
发明人： Shin Saito
IPC分类号： H04L27/12 , H04B1/44 , H04L27/20 , H04L27/10
CPC分类号： H04L27/20 , H04B1/44
摘要： A transmitter which can easily suppress diffusion of a spurious signal with a simple constitution, wherein the on/off operations of the transmitting circuit and the carrier signal generating circuit are controlled by the first control signal which rises at the predetermined timing and falls at the predetermined timing, and the on/off operation of the modulator is controlled by the second control signal which gently rises at the same or later timing than the rise timing of the first control signal and gently falls at the same or earlier timing than the fall timing of the first control signal, so that a phenomenon which is similar to pulse modulation of the leaked carrier signal fc becomes hard to be generated, therefore diffusion of the spurious signal can be suppressed.
摘要翻译：一种发射机，其能够以简单的结构容易地抑制寄生信号的扩散，其中发射电路和载波信号发生电路的接通/断开操作由在预定定时上升并落在预定时间的第一控制信号控制定时，并且调制器的开/关操作由与第一控制信号的上升定时相同或更迟的定时温和上升的第二控制信号控制，并且在与第一控制信号的下降定时相同或更早的定时下轻轻地下降第一控制信号，使得类似于泄漏的载波信号fc的脉冲调制的现象变得难以产生，从而可以抑制寄生信号的扩散。

124. 发明授权

US5790555A Signal multiplexer and multiplexing method 失效
标题翻译：信号多路复用和复用方法
公开(公告)号：US5790555A
公开(公告)日：1998-08-04
申请号：US663278
申请日：1996-06-07
申请人： Shoichi Narahashi , Ken Kumagai , Toshio Nojima , Yoshiaki Tarusawa
发明人： Shoichi Narahashi , Ken Kumagai , Toshio Nojima , Yoshiaki Tarusawa
IPC分类号： H03G3/30 , H04B1/04 , H04J1/00 , H04J1/06 , H04J1/16 , H04J1/20 , H04L5/06 , H04L27/10 , H04L27/12 , H04L27/26
CPC分类号： H04J1/06 , H03G3/30 , H03G3/3042 , H04J1/065 , H04J1/16 , H04J1/20 , H04L27/10 , H04L27/12 , H04L5/06 , H04L27/2621
摘要： The frequencies of input modulated signals fed via ports 11.sub.1 to 11.sub.n are converted by frequency converting parts 12.sub.1 to 12.sub.n to different bands, and the converted outputs are applied to power combining part 24 decides if 16 via variable attenuators 21.sub.1 to 21.sub.n, respectively, and provided therefrom as a multiplexed output a portion of which is branched. The envelope power level L is detected by level detecting part 23. Control with the detected level L exceeds a level L.sub.s that is k times the average power of the multiplexed signal k being about 4 to 5, and controls the attenuators 21.sub.1 to 21.sub.n to attenuate the average power of the modulated signal by k/n-fold or less for about 1/.DELTA.F.sub.0 (sec), where (.DELTA.F.sub.0 �Hz! is the frequency bandwidth of the multiplexed signal.
摘要翻译： PCT No.PCT / JP95 / 02467 Sec。 371日期1996年6月7日第 102（e）日期1996年6月7日PCT 1995年12月4日PCT PCT。公开号WO96 / 18249 日期1996年6月13日经由端口111至11n馈送的输入调制信号的频率由频率转换部分121至12n转换为不同频带，并且转换后的输出被施加到功率合成部分24通过可变衰减器211至21n判定16 ，并作为其一部分分支的多路复用输出。包络功率电平L由电平检测部23检测。具有检测电平L的控制超过多路复用信号k的k倍的k倍的电平Ls为约4〜5，并且控制衰减器211〜21n衰减对于约1 / DELTA F0（sec），调制信号的平均功率为k / n倍或更小，其中（DELTA F0 [Hz]是多路复用信号的频率带宽）。

125. 发明授权

US5764700A Digital radio link system and radio link terminal 失效
标题翻译：数字无线链路系统和无线链路终端
公开(公告)号：US5764700A
公开(公告)日：1998-06-09
申请号：US619702
申请日：1996-06-28
申请人： Jarmo Makinen
发明人： Jarmo Makinen
IPC分类号： H04L27/10 , H04B1/30 , H04B1/40 , H04B1/44 , H04B1/54 , H04B7/155 , H04L5/16 , H04L5/14
CPC分类号： H04B1/54 , H04B1/30 , H04B1/44
摘要： A radio link system in which a fixed radio connection is established between two radio link terminals. The radio link terminals transmit alternately at the same radio frequency. Each of the radio link terminals includes (a) a baseband modulator in the transmitting branch for generating baseband modulation signals from a digital data stream; (b) a demodulator in the receiving branch for generating a baseband data stream by demodulating baseband signals to be received; (c) a common quadrature mixer and a local oscillator for forming an RF transmitting signal directly from the baseband modulation signals to be received directly from the RF signal to be received; and (d) a timer for connecting the radio link terminal alternately to a transmitting and receiving mode. The transmitting and receiving branches are separated at the baseband.
摘要翻译： PCT No.PCT / FI94 / 00426 Sec。 371日期：1996年6月28日 102（e）日期1996年6月28日PCT 1994年9月22日PCT公布。出版物WO95 / 08874 日期1995年3月30日在两个无线电链路终端之间建立固定无线电连接的无线电链路系统。无线链路终端以相同的射频交替发送。每个无线电链路终端包括：（a）发射分支中的基带调制器，用于从数字数据流产生基带调制信号; （b）接收分支中的解调器，用于通过解调要接收的基带信号来产生基带数据流; （c）公共正交混频器和本地振荡器，用于直接从待接收的RF信号直接接收的基带调制信号形成RF发射信号; 和（d）用于将无线电链路终端交替地连接到发送和接收模式的定时器。发射和接收分支在基带分离。

126. 发明授权

US5757858A Dual-mode digital FM communication system 失效
标题翻译：双模数字FM通信系统
公开(公告)号：US5757858A
公开(公告)日：1998-05-26
申请号：US779601
申请日：1997-01-07
申请人： Peter J. Black , Nathaniel B. Wilson
发明人： Peter J. Black , Nathaniel B. Wilson
IPC分类号： H04L27/10 , H04B1/04 , H04B1/40 , H04B7/26 , H04L25/49 , H04L27/14 , H04L27/233 , H04W4/18 , H04W88/06 , H04B1/16 , H04J13/02
CPC分类号： H04B1/406 , H04L25/4904 , H04L27/142 , H04L27/2337 , H04B2201/70707 , H04W4/18 , H04W88/06
摘要： A dual-mode digital communication system for communicating an information signal during operation in frequency-modulated (FM) and multiple-access modes is disclosed herein. The digital communication system includes a dual-mode transmitter for transmitting the information signal using an FM communication signal during FM mode operation, and for transmitting the information signal using a multiple-access communication signal during multiple-access mode operation. The communication system further includes a dual-mode receiver for receiving the FM communication signal during FM mode operation, and for receiving the multiple-access communication signal during multiple-access mode operation. Incorporated within the dual-mode receiver is a digital demodulator for recovering the information signal from the received FM signal during operation in the FM mode, and for recovering the information signal from the received multiple-access signal during multiple-access mode operation. In a preferred implementation the dual-mode transmitter is disposed to convert a first sequence of binary data within the information signal into a sampled modulation waveform, and to provide the FM communication signal by modulating a carrier signal based at least in part on the sampled modulation waveform. The dual-mode transmitter may also be configured to multiplex a second sequence of wideband message data with the sampled modulation waveform so as to form a composite FM modulation waveform.
摘要翻译：这里公开了一种用于在频率调制（FM）和多接入模式中的操作期间传送信息信号的双模式数字通信系统。数字通信系统包括一个双模发射机，用于在FM模式操作期间使用FM通信信号发送信息信号，并且在多址模式操作期间使用多址通信信号发送信息信号。通信系统还包括一个双模式接收器，用于在FM模式操作期间接收FM通信信号，并且用于在多址模式操作期间接收多址通信信号。在双模式接收机内并入的是数字解调器，用于在FM模式下操作期间从接收到的FM信号中恢复信息信号，并且用于在多址模式操作期间从所接收的多址信号中恢复信息信号。在优选实施例中，双模式发射器被设置成将信息信号内的二进制数据的第一序列转换成采样的调制波形，并且至少部分地基于采样的调制来调制载波信号来提供FM通信信号波形双模发射机还可以被配置为将第二序列宽带消息数据与采样的调制波形进行复用，以形成复合FM调制波形。

127. 发明授权

US5706307A Method and arrangement for the determination of the ratio for common-channel or adjacent-channel interferers in digital mobile communication networks 失效
标题翻译：用于确定数字移动通信网络中的公共信道或相邻信道干扰源的比率的方法和装置
公开(公告)号：US5706307A
公开(公告)日：1998-01-06
申请号：US405583
申请日：1995-03-17
申请人： Ingo Gaspard
发明人： Ingo Gaspard
IPC分类号： G01R29/08 , G01R29/26 , G01S5/14 , H04B1/04 , H04B1/10 , H04B7/26 , H04B17/336 , H04L27/10 , H04L27/14
CPC分类号： H04B17/336
摘要： In accordance with the invention, the incoming receiver signal is subject to an envelope demodulation by means of a measuring receiver 2. Subsequently, for a defined measurement time T.sub.ges) in defined time differences .DELTA.T, the signal is sampled and digitized via an analog/digital converter 3 and stored in a computer 4 as a consecutive sequence of 1-N values of the square of the envelope function R.sup.2 (t). From these stored values the auxiliary values X' and Y' are generated, whereby Y' is corrected by means of an appropriate correction factor k. Then, the C/I ratio is determined via the proper procedures. The method of the invention distinguishes itself in that, with relatively little expenditure and taking into consideration the typical features of the GSM mobile communication network, and based on the receiving power as a function of time, the C/I ratio is determined from the values of the function of this time function by means of an analytical calculation.
摘要翻译：根据本发明，输入的接收机信号通过测量接收机2进行包络解调。随后，对于定义的时间差DELTA T中的定义的测量时间Tges），信号被采样并经由模拟/ 数字转换器3并作为包络函数R2（t）的平方的1-N值的连续序列存储在计算机4中。根据这些存储值，产生辅助值X'和Y'，由此通过适当的校正因子k对Y'进行校正。然后，通过适当的程序确定C / I比。本发明的方法区别在于，以相对较少的支出并考虑到GSM移动通信网的典型特征，并且基于作为时间的函数的接收功率，C / I比由值的这个功能的功能通过分析计算。

128. 发明授权

US5692013A Shared resources modulator-demodulator circuits for use with quadrature amplitude modulated signals 失效
标题翻译：用于正交幅度调制信号的共享资源调制解调器电路
公开(公告)号：US5692013A
公开(公告)日：1997-11-25
申请号：US554696
申请日：1995-11-07
申请人： Joshua Lawrence Koslov , Frank Anton Lane , Carl G. Scarpa
发明人： Joshua Lawrence Koslov , Frank Anton Lane , Carl G. Scarpa
IPC分类号： H04L27/36 , H04L27/38 , H04L27/10
CPC分类号： H04L27/3854 , H04L27/362
摘要： A common transceiver circuit for use as either a modulator or demodulator and that is implemented through a shared resource approach. This approach is particularly, though not exclusively, suited for with quadrature amplitude modulated (QAM) or vestigial sideband (VSB) signals. Specifically, a QAM transceiver circuit (400), through strategically located multiplexing stages, physically re-uses both a complex Nyquist filter (310, 320) and an equalizer (140) for demodulation and modulation. Additionally, tap coefficients of the complex Nyquist filter are set such that a center frequency of an otherwise baseband Nyquist filter is translated upward to a symbol rate in order to eliminate a separate complex mixer (250, 260). Similarly, a VSB transceiver circuit (700), also through strategically located multiplexing stages, physically re-uses a complex vestigial Nyquist filter (610), a complex mixer (620) and an equalizer (785) during demodulation and modulation. The VSB transceiver also selects a particular configuration of a common complex Hilbert transform circuit (720) for use during either demodulation or modulation. In either transceiver, the same equalizer selectively provides both channel equalization, during de-modulation, and (sin x)/x compensation, during modulation, through use of differing corresponding sets of tap coefficients.
摘要翻译：用作调制器或解调器的通用收发器电路，通过共享资源方法实现。该方法特别地，尽管不是排他地适用于正交幅度调制（QAM）或残留边带（VSB）信号。具体地说，QAM收发器电路（400）通过策略地定位的复用级，物理地重新使用复数奈奎斯特滤波器（310,320）和均衡器（140）进行解调和调制。此外，复数奈奎斯特滤波器的抽头系数被设置为使得否则基带奈奎斯特滤波器的中心频率向上转换到符号速率，以消除单独的复合混频器（250,260）。类似地，在解调和调制期间，也通过策略地定位的复用级的VSB收发器电路（700）在物理上重新使用复杂的残留奈奎斯特滤波器（610），复混合器（620）和均衡器（785）。 VSB收发器还选择在解调或调制期间使用的公共复合希尔伯特变换电路（720）的特定配置。在任一收发器中，相同的均衡器通过使用不同对应的抽头系数组，在调制期间，在去调制期间和（sin x）/ x补偿期间选择性地提供信道均衡。

129. 发明授权

US5648985A Universal radio architecture for low-tier personal communication system 失效
标题翻译：用于低层个人通信系统的通用无线电架构
公开(公告)号：US5648985A
公开(公告)日：1997-07-15
申请号：US348359
申请日：1994-11-30
申请人： Bjorn E. Bjerede , Joseph T. Lipowski , Benny Madsen , Sheldon L. Gilbert , James E. Petranovich
发明人： Bjorn E. Bjerede , Joseph T. Lipowski , Benny Madsen , Sheldon L. Gilbert , James E. Petranovich
IPC分类号： H04L27/10 , H04B1/26 , H04B1/40 , H04B1/56 , H04J1/00 , H04L5/14 , H04L27/00 , H04L27/18 , H04B1/38
CPC分类号： H04L27/0008 , H04B1/403 , H04L5/143 , H04L5/1492 , H04B1/56
摘要： An integrated circuit chip set is provided for use in a radio communication system in which a modulated digital input signal is processed for transmission and a modulated signal received from an antenna is processed to provide an output signal, wherein the modulation of the signals is either QPSK or FSK and the signal transmission and reception is by either TDD or FDD. The chip set includes an IF integrated circuit chip for processing a digital input signal to convert the digital input signal into an analog input signal and to provide the input signal at an intermediate frequency and for processing a received signal at the intermediate frequency to down convert the frequency thereof and to provide an output signal from the down-converted received signal; and an RF integrated circuit chip for processing the input signal provided by the IF chip at the intermediate frequency to up convert the frequency thereof to a transmission frequency and for processing a received signal provided at the reception frequency to down convert the frequency thereof to the intermediate frequency. The IF chip includes switches and terminals for enabling the IF chip to be connected for processing by the IF chip of QPSK-modulated signals or to be connected for processing by the IF chip of FSK-modulated signals; and the RF chip includes terminals for enabling the RF chip to be connected for processing by the RF chip of TDD transmitted and received signals or to be connected for processing by the RF chip of FDD transmitted and received signals.
摘要翻译：提供一种用于无线电通信系统的集成电路芯片组，其中调制的数字输入信号被处理用于传输，并且处理从天线接收的调制信号以提供输出信号，其中信号的调制是QPSK 或FSK，并且信号发送和接收是通过TDD或FDD。芯片组包括用于处理数字输入信号以将数字输入信号转换成模拟输入信号并且以中频提供输入信号并用于处理中频处的接收信号的IF集成电路芯片，并提供来自下变频接收信号的输出信号; 以及用于处理由IF芯片在中频提供的输入信号的RF集成电路芯片，以将其频率向上转换为传输频率，并处理以接收频率提供的接收信号，以将其频率下变频到中间频率。 IF芯片包括用于使IF芯片连接以由IF芯片进行QPSK调制信号处理的开关和端子，或者被IFK芯片进行FSK调制信号的处理连接; 并且RF芯片包括终端，用于使RF芯片能够被连接用于RF芯片的TDD发送和接收信号的处理，或者被连接以供FDD发送和接收信号的RF芯片处理。

130. 发明授权

US5636248A Method and system for regenerating amplitude and timing characteristics of an analog signal 失效
标题翻译：用于再生模拟信号的幅度和定时特性的方法和系统
公开(公告)号：US5636248A
公开(公告)日：1997-06-03
申请号：US319146
申请日：1994-10-04
申请人： Harvey Tash , Robert C. Reed
发明人： Harvey Tash , Robert C. Reed
IPC分类号： H04J3/04 , H04L25/49 , H04L27/10
CPC分类号： H04J3/047 , H04L25/4904
摘要： The present invention provides a system and method for using a single digzed component of an analog signal to be converted into a pair of digital signals used to re-establish the analog signal. A low level serial transceiver transforms a first analog signal into a first digital signal representing the complement of the first analog signal. The first digital signal is propagated through an electronic interface circuit such as a matrix switch or through some electronic circuit used to detect characteristics of the analog signal. In response to receiving the first digital signal, a logic circuit generates a second digital signal representing the analog signal, and also outputs the first digital signal. In response to receiving the first and second digital signals, a retimer generates a third digital signal comprising a series of pulses. Each of the pulses of the third digital signal is generated in response to the retimer determining that the first digital signal undergoes a positive voltage transition from one logic level to a higher logic level. The retimer also generates a fourth digital signal comprising a series of pulses. Similarly, each pulse of the fourth digital signal is generated in response to the retimer determining that the second digital signal undergoes a positive voltage transition from one logic level to a higher logic level. A second low level serial transceiver transforms the third and fourth digital signals into a second analog signal having substantially the same waveform as has the first analog signal.
摘要翻译：本发明提供了一种用于将模拟信号的单个数字化分量转换成用于重新建立模拟信号的一对数字信号的系统和方法。低电平串行收发器将第一模拟信号转换成表示第一模拟信号的补码的第一数字信号。第一数字信号通过诸如矩阵开关的电子接口电路或通过用于检测模拟信号的特性的某些电子电路传播。响应于接收到第一数字信号，逻辑电路产生表示模拟信号的第二数字信号，并且还输出第一数字信号。响应于接收到第一和第二数字信号，重新定时器产生包括一系列脉冲的第三数字信号。第三数字信号的每个脉冲响应于重定时器确定第一数字信号经历从一个逻辑电平到较高逻辑电平的正电压转换而产生。再定时器还产生包括一系列脉冲的第四数字信号。类似地，响应于重新定时器确定第二数字信号经历从一个逻辑电平到较高逻辑电平的正电压转换，产生第四数字信号的每个脉冲。第二低电平串行收发器将第三和第四数字信号转换为具有与第一模拟信号基本相同的波形的第二模拟信号。

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