-
公开(公告)号：US07155128B2
公开(公告)日：2006-12-26
申请号：US10014353
申请日：2001-12-14
IPC分类号： H04J14/02
CPC分类号： H04B10/2563 , H04J14/02
摘要： A method and system for reducing non-linear signal degradation effects of WDM optical signals exacerbated by highly correlated bit patterns of optical waveforms in neighboring optical channels. Embodiments include offsetting the transmission times of signals in neighboring channels, and applying different scrambling patterns to the respective data streams prior to transmission on neighboring optical channels.
摘要翻译： 一种用于减少WDM光信号的非线性信号劣化效应的方法和系统，其由相邻光信道中的光波形的高度相关位模式加剧。 实施例包括抵消相邻信道中的信号的传输时间，以及在相邻光信道上传输之前将各种数据流应用不同的加扰模式。
-
2.发明授权Method and apparatus for optimization of a data communications system using sacrificial bits 有权用于优化使用牺牲位的数据通信系统的方法和装置公开(公告)号：US06735259B1
公开(公告)日：2004-05-11
申请号：US09466664
申请日：1999-12-20
IPC分类号： H03K900
CPC分类号： H04L7/0337 , H04L7/043 , H04L25/063
摘要： A method and apparatus for using sacrificial bits in a data stream to adjust sampling parameters for the data stream is described. The sacrificial bits are a predetermined sequence of a predetermined length. The sampling parameters are perturbed during transmission or reception of the sacrificial bits in order to provide information useful in adjusting the sampling parameters of the apparatus. Adjustment is accomplished by computing a bit error rate during the perturbing of sampling parameters in order to probe edges of an eye closure of the detected signal. The advantage is faster homing on optimal sampling parameters with little sacrifice of transmission capacity.
摘要翻译： 描述了一种在数据流中使用牺牲位来调整数据流的采样参数的方法和装置。 牺牲位是预定长度的预定序列。 在牺牲位的发送或接收期间，采样参数受到扰动，以便提供有助于调整装置的采样参数的信息。 通过在采样参数的扰动期间计算误码率来完成调整，以探测检测信号的眼睛闭合的边缘。 优点是在最佳采样参数下更快地归位传输容量。
-
公开(公告)号：US06115363A
公开(公告)日：2000-09-05
申请号：US802692
申请日：1997-02-19
申请人： Wolfgang Oberhammer , Andy Rowland
发明人： Wolfgang Oberhammer , Andy Rowland
CPC分类号： H03D7/163 , H04B1/26 , H04B2001/0491
摘要： A radio transceiver system uses a single variable local oscillator frequency source which is used in mixing both before and after a band-pass filter. This causes a reduction in band-pass filter bandwidths. In an all-band transceiver for PCS for example the effect of this reduced bandwidth requirement is to increase the spacing between the transmit bands and the receive bands and thereby enable a reduction in transmission noise interfering with the reception bands.
摘要翻译： 无线电收发器系统使用单个可变本地振荡器频率源，其用于在带通滤波器之前和之后混合。 这导致带通滤波器带宽的减少。 例如，在用于PCS的全频带收发器中，这种减少带宽需求的影响是增加发射频带和接收频带之间的间隔，从而能够降低干扰接收频带的传输噪声。
-
4.发明授权公开(公告)号：US06360078B1
公开(公告)日：2002-03-19
申请号：US09219458
申请日：1998-12-23
IPC分类号： H04B1700
CPC分类号： H03J7/02
摘要： An RF receiver, which is one of a network of receivers, is described which allows for a simple method of compensating for the group time delay asymmetry of an IF filter in the receiver. Compensation of the group time delay is important for time difference of arrival (TDOA) measurements for mobile location tracking applications, such as E-911 applications. The TDOA measurements are performed by the receiver network. The RF receiver includes a switch which alternately switches between two RF LO frequencies for consecutive pulse signals received from a mobile transmitter. One of the two RF LO frequencies is offset by the IF frequency on the positive side of the center frequency of the mobile transmitter signal received by the receiver. The other RF LO frequency is offset by the IF frequency on the negative side of the center frequency. The group time delay of the IF filter may be compensated for by switching between the two RF LO frequencies, performing a time of arrival (TOA) measurement for the signals corresponding to each of the RF LO frequencies, and averaging the group time delays for each TOA. A TOA estimator causes the switch to switch an RF LO oscillator between the two RF LO frequencies. A method for compensating for the group time delay asymmetry corresponding to the receiver is also described.
摘要翻译： 描述了作为接收机网络之一的RF接收机，其允许补偿接收机中的IF滤波器的组时延不对称性的简单方法。 组时延的补偿对于移动位置跟踪应用（如E-911应用）的到达时间差（TDOA）测量很重要。 TDOA测量由接收机网络执行。 RF接收机包括交替地切换从用于从移动发射机接收的连续脉冲信号的两个RF LO频率之间的开关。 两个RF LO频率之一被接收机接收的移动发射机信号的中心频率的正侧的IF频率偏移。 另一个RF LO频率由中心频率负侧的IF频率偏移。 可以通过在两个RF LO频率之间切换来补偿IF滤波器的组时间延迟，对与每个RF LO频率相对应的信号执行到达时间（TOA）测量，以及对每个RF LO频率的组时延 TOA。 TOA估计器使开关在两个RF LO频率之间切换RF LO振荡器。 还描述了用于补偿对应于接收机的群时延不对称性的方法。
-
公开(公告)号：US6157682A
公开(公告)日：2000-12-05
申请号：US050128
申请日：1998-03-30
申请人： Wolfgang Oberhammer
发明人： Wolfgang Oberhammer
CPC分类号： H04B1/0025 , H03D7/00 , H04B1/28 , H04B1/00
摘要： A wideband receiver capable of handling the new extended A and B cellular spectrum is provided. Portions of the band are converted using analog conversion into a frequent between Fs/4 and Fs/2 where Fs is a sampling frequency of an analog-to-digital converter. Other portions of the band are converted such that when they are sampled by the analog-to-digital converter aliasing causes them to lie in the baseband frequencies between zero and Fs/2, and more particularly in baseband frequencies which do not interfere with the other converted bands.
摘要翻译： 提供了能够处理新的扩展的A和B蜂窝频谱的宽带接收机。 使用模拟转换将频带的一部分转换成Fs / 4和Fs / 2之间的频率，其中Fs是模数转换器的采样频率。 频带的其他部分被转换，使得当它们被模数转换器采样时，混叠使得它们位于零和Fs / 2之间的基带频率中，并且更具体地在不干扰另一个的基带频率 转换乐队。
-
公开(公告)号：US06333707B1
公开(公告)日：2001-12-25
申请号：US09469467
申请日：1999-12-22
申请人： Wolfgang Oberhammer , Bixia Li
发明人： Wolfgang Oberhammer , Bixia Li
IPC分类号： H03M112
CPC分类号： H04B1/0007 , H03M1/188 , H04B1/0003 , H04B1/28
摘要： A digitizer with increased dynamic range is provided by applying varying gains/attenuations to an input signal and feeding the resulting scaled signals to several conventional analog-to-digital converters to be digitized. The digitized version of the largest scaled signal which does not result in its respective analog-to-digital converter from saturating is selected by a multiplexer to be fed through as the digitizer output. Each of the gains(attenuations) differ by multiples of approximately 6 dB, since one bit in an ADC represents this value. The multiplexer outputs a digital sample size which is larger than that of the analog-to-digital converters and with the selected digitized version being output as the appropriate subset of the larger sample size to account for the gain(attenuation) of the selected signal. Preferably, this is used in a wideband receiver to increase the dynamic range of the receiver.
摘要翻译： 通过对输入信号应用变化的增益/衰减来提供具有增加的动态范围的数字化仪，并将所得到的缩放信号馈送到要数字化的几个常规模数转换器。 不会导致其相应的模数转换器饱和的最大比例信号的数字化版本由多路复用器选择作为数字转换器输出。 每个增益（衰减）差值大约为6 dB，因为ADC中的一位表示此值。 多路复用器输出的数字样本大小大于模数转换器的数字采样大小，所选择的数字化版本作为较大采样大小的适当子集输出，以考虑所选信号的增益（衰减）。 优选地，这用于宽带接收机以增加接收机的动态范围。
-
公开(公告)号：US6031478A
公开(公告)日：2000-02-29
申请号：US25831
申请日：1998-02-19
申请人： Wolfgang Oberhammer , Bixia Li
发明人： Wolfgang Oberhammer , Bixia Li
CPC分类号： H03M1/188
摘要： A digitizer with increased dynamic range is provided by applying varying gains/attenuations to an input signal and feeding the resulting scaled signals to several conventional analog-to-digital converters to be digitized. The digitized version of the largest scaled signal which does not result in its respective analog-to-digital converter from saturating is selected by a multiplexer to be fed through as the digitizer output. Each of the gains(attenuations) differ by multiples of approximately 6 dB, since one bit in an ADC represents this value. The multiplexer outputs a digital sample size which is larger than that of the analog-to-digital converters and with the selected digitized version being output as the appropriate subset of the larger sample size to account for the gain(attenuation) of the selected signal. Preferably, this is used in a wideband receiver to increase the dynamic range of the receiver.
摘要翻译： 通过对输入信号应用变化的增益/衰减来提供具有增加的动态范围的数字化仪，并将所得到的缩放信号馈送到要数字化的几个常规模数转换器。 不会导致其相应的模数转换器饱和的最大比例信号的数字化版本由多路复用器选择作为数字转换器输出。 每个增益（衰减）差值大约为6 dB，因为ADC中的一位表示此值。 多路复用器输出的数字样本大小大于模数转换器的数字采样大小，所选择的数字化版本作为较大采样大小的适当子集输出，以考虑所选信号的增益（衰减）。 优选地，这用于宽带接收机以增加接收机的动态范围。
-
公开(公告)号：US6037846A
公开(公告)日：2000-03-14
申请号：US168928
申请日：1998-10-09
申请人： Wolfgang Oberhammer
发明人： Wolfgang Oberhammer
IPC分类号： H01R13/7195 , H03H1/00 , H05K9/00 , H03H7/01
CPC分类号： H01R13/7195 , H03H1/0007 , H05K9/0015 , H05K9/0039
摘要： A planar filter connector is disclosed for the transmission of signals to be passed in and out of an EMI shielded enclosure. The EMI enclosure has walls the free ends of which are provided with an electrically conductive, resilient gasket. The filter connector is located on a conductive pad on a printed circuit board and is positioned under a portion of one of the walls, the gasket being depressed to accommodate the filter connector. The connector consists of a planar conductor surrounded by high dielectric material and further surrounded by two planar metallization layers. One metallization layer is in electrical contact with the gasket and the other metallization layer is in contact with the conductive pad. Shielding through the connector is maintained by the capacitance created between the conductor and each of the metallization layers.
摘要翻译： 公开了一种平面滤波器连接器，用于传输要被传入和传出EMI屏蔽外壳的信号。 EMI外壳具有壁，其自由端设置有导电的弹性垫圈。 过滤器连接器位于印刷电路板上的导电焊盘上，并且位于一个壁的一部分下方，垫圈被压下以容纳过滤器连接器。 连接器包括由高介电材料包围并被两个平面金属化层包围的平面导体。 一个金属化层与衬垫电接触，另一个金属化层与导电焊盘接触。 通过连接器的屏蔽通过在导体和每个金属化层之间产生的电容来维持。
-
公开(公告)号：US5914634A
公开(公告)日：1999-06-22
申请号：US932710
申请日：1997-09-17
申请人： Wolfgang Oberhammer
发明人： Wolfgang Oberhammer
CPC分类号： H03F1/56 , H03F3/19 , H03F3/72 , H03F2200/294 , H03F2200/372
摘要： An amplifier circuit has an amplifying transistor which is switched on and off by a switching transistor under control of a control signal selectively applied to the switching transistor. In this way a selection is made whether or not to amplify an input signal on an antenna. The switching transistor forms part of the biasing circuit for the amplifying transistor such that when the switching transistor is on the amplifying transistor is biased off. A PIN diode and series resistor are together connected in shunt across the switching transistor such that the bias voltage which causes the amplifying transistor to be off causes the PIN diode to be forward biased thereby causing the antenna to be terminated with the resistor the value of which may be chosen to be 50 ohms.
摘要翻译： 放大器电路具有放大晶体管，其在选择性地施加到开关晶体管的控制信号的控制下由开关晶体管导通和截止。 以这种方式，选择是否放大天线上的输入信号。 开关晶体管构成用于放大晶体管的偏置电路的一部分，使得当放大晶体管上的开关晶体管被偏置时。 PIN二极管和串联电阻一起连接在开关晶体管两端并联，使得导致放大晶体管截止的偏置电压导致PIN二极管被正向偏置，从而使天线用电阻器终止，其值 可以选择为50欧姆。
-
-
-
-
-
-
-
-
搜索结果
9 条记录 (耗时 0.022 秒)
