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公开(公告)号：US5973643A
公开(公告)日：1999-10-26
申请号：US838918
申请日：1997-04-11
摘要： A location system for identifying locations of emitters in a cellular telephone service area. Searching identifies active emitters in the service area to find the coarse areas in which active emitters are located, using selection criteria to designate one or more of the active emitters as selected emitters. Emitter signals are measured with a plurality of sensors, each sensor at a different location. Groups of the sensors are tasked, one group of tasked sensors for each corresponding selected emitter. Each tasked sensor takes a measurement on an emitter signal transmitted by the corresponding selected emitter. The measurements are processed to determine the location of each selected emitter based on the measurements from the group of tasked sensors.
摘要翻译： 一种用于识别蜂窝电话服务区中的发射器的位置的定位系统。 搜索识别服务区域中的活动发射器，以找到活动发射器所在的粗略区域，使用选择标准将一个或多个有源发射器指定为所选择的发射器。 发射器信号用多个传感器测量，每个传感器位于不同的位置。 传感器组由任务组成，每组对应的选定发射器为一组任务传感器。 每个任务传感器对相应选定发射器发射的发射极信号进行测量。 根据来自任务传感器组的测量，处理测量值以确定每个所选发射器的位置。
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公开(公告)号：US20130033317A1
公开(公告)日：2013-02-07
申请号：US13197691
申请日：2011-08-03
IPC分类号： H03F1/26
CPC分类号： H03F1/3247 , H03F1/3294 , H03F2200/192 , H03F2200/195 , H03F2200/204 , H03F2200/207 , H03F2200/228
摘要： An apparatus and a method select and use parameter values for an RF power amplifier linearizer to pre-distort the input signals of a power amplifier, so as to achieve a linear output response in the power amplifier. The apparatus and the method select from a number sets of parameter values, each set of parameter values corresponding to a different output power range of the power amplifier. The set of parameters include a coefficient vector tailored for the particular output power range for that set. The power amplifier input power is repeatedly measured and filtered at various time intervals. The input power measurements may be filtered by a fast attack/slow decay filter, which follows the peaks of the measurements under operation of the fast attack portion of the filter and provides a low variance during operation of the slow decay portion of the filter. The coefficient values for the predistortion linearization of the power amplifier is adapted dynamically, in response to changes in the input power level of the power amplifier. In one embodiment, hysteresis is used to reduce the rate at which the predistortion linearizer hops between two sets of the parameter values. Using the apparatus and the method, good ACLR across a wide range of power amplifier output power is achieved. Such characteristics are particularly advantageous in a system in which waveforms having fast power transients are present.
摘要翻译： 一种装置和方法选择并使用RF功率放大器线性化器的参数值来预失真功率放大器的输入信号，从而在功率放大器中实现线性输出响应。 该装置和方法从多组参数值中选择每组与功率放大器的不同输出功率范围对应的参数值。 该组参数包括针对该组的特定输出功率范围量身定制的系数向量。 功率放大器输入功率以不同的时间间隔重复测量和滤波。 输入功率测量可以通过快速攻击/慢衰减滤波器来滤波，该滤波器跟随滤波器的快速攻击部分操作的测量的峰值，并且在滤波器的缓慢衰减部分的操作期间提供低的方差。 响应于功率放大器的输入功率电平的变化，功率放大器的预失真线性化的系数值被动态地适配。 在一个实施例中，使用滞后来降低预失真线性化器在两组参数值之间跳跃的速率。 使用该装置和方法，实现了广泛的功率放大器输出功率的良好的ACLR。 在存在具有快速功率瞬变的波形的系统中，这种特性是特别有利的。
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3.发明授权
公开(公告)号：US5905949A
公开(公告)日：1999-05-18
申请号：US576116
申请日：1995-12-21
摘要： Apparatus for identifying wireless subscriber units and for determining if access to a communications network should be granted. A plurality of wireless subscriber units each generates a wireless subscriber signal including internal data traits and external signal traits. The internal data traits include an identification code. A RF downconverter is located remote from the wireless subscriber units and receives the wireless subscriber signal. A characterizing device is connected to the RF downconverter and extracts parameters that characterize the external signal traits of the wireless subscriber units. A decision device computes the likelihood that the observed parameters belong to the validated wireless subscriber unit to determine if access to the wireless subscriber service should be granted. The apparatus may be used to prevent cellular telephone cloning fraud.
摘要翻译： 用于识别无线用户单元并用于确定是否应该授予对通信网络的接入的装置。 多个无线用户单元各自产生包括内部数据特征和外部信号特征的无线用户信号。 内部数据特征包括识别码。 RF下变频器位于远离无线用户单元的位置，并接收无线用户信号。 表征设备连接到RF下变频器，并提取表征无线用户单元的外部信号特性的参数。 决策设备计算观测参数属于经过验证的无线用户单元以确定是否应该授予无线用户服务的接入的可能性。 该装置可以用于防止蜂窝电话克隆欺诈。
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4.发明授权Transient analysis system for characterizing RF transmitters by analyzing transmitted RF signals 失效通过分析发射的射频信号来表征射频发射机的瞬态分析系统
公开(公告)号：US5758277A
公开(公告)日：1998-05-26
申请号：US716840
申请日：1996-09-19
CPC分类号： H04B17/391 , H04W12/06
摘要： A transient analysis system that characterizes the transients in RF signals from radio transmitters. Transient characterization permits identification of the transmitter and is useful in cellular telephone fraud prevention systems. The characterization is based on the analysis of the chirp waveform or the complex auto-correlation sequence.
摘要翻译： 一种瞬态分析系统，其特征在于来自无线电发射机的RF信号的瞬变。 瞬态表征允许识别发射机，并且在蜂窝电话欺诈预防系统中是有用的。 表征是基于啁啾波形或复杂自相关序列的分析。
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公开(公告)号：US08519789B2
公开(公告)日：2013-08-27
申请号：US13197691
申请日：2011-08-03
IPC分类号： H03F1/26
CPC分类号： H03F1/3247 , H03F1/3294 , H03F2200/192 , H03F2200/195 , H03F2200/204 , H03F2200/207 , H03F2200/228
摘要： An apparatus and a method select and use parameter values for an RF power amplifier linearizer to pre-distort the input signals of a power amplifier, so as to achieve a linear output response in the power amplifier. The apparatus and the method select from a number sets of parameter values, each set of parameter values corresponding to a different output power range of the power amplifier. The set of parameters include a coefficient vector tailored for the particular output power range for that set. The power amplifier input power is repeatedly measured and filtered at various time intervals. The input power measurements may be filtered by a fast attack/slow decay filter, which follows the peaks of the measurements under operation of the fast attack portion of the filter and provides a low variance during operation of the slow decay portion of the filter. The coefficient values for the predistortion linearization of the power amplifier is adapted dynamically, in response to changes in the input power level of the power amplifier. In one embodiment, hysteresis is used to reduce the rate at which the predistortion linearizer hops between two sets of the parameter values. Using the apparatus and the method, good ACLR across a wide range of power amplifier output power is achieved. Such characteristics are particularly advantageous in a system in which waveforms having fast power transients are present.
摘要翻译： 一种装置和方法选择并使用RF功率放大器线性化器的参数值来预失真功率放大器的输入信号，从而在功率放大器中实现线性输出响应。 该装置和方法从多组参数值中选择每组与功率放大器的不同输出功率范围对应的参数值。 该组参数包括针对该组的特定输出功率范围量身定制的系数向量。 功率放大器输入功率以不同的时间间隔重复测量和滤波。 输入功率测量可以通过快速攻击/慢衰减滤波器来滤波，该滤波器跟随滤波器的快速攻击部分操作的测量的峰值，并且在滤波器的缓慢衰减部分的操作期间提供低的方差。 响应于功率放大器的输入功率电平的变化，功率放大器的预失真线性化的系数值被动态地适配。 在一个实施例中，使用滞后来降低预失真线性化器在两组参数值之间跳跃的速率。 使用该装置和方法，实现了广泛的功率放大器输出功率的良好的ACLR。 在存在具有快速功率瞬变的波形的系统中，这种特性是特别有利的。
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公开(公告)号：US5835530A
公开(公告)日：1998-11-10
申请号：US729486
申请日：1996-10-11
CPC分类号： H04B17/382 , H04B17/27
摘要： System for measurement of the bit period (or bit rate or baud rate or symbol rate) and bit epoch (or symbol epoch) of a digitally modulated signal by extracting a bit time-of-transition array, determining an emphasis array with individual elements thereof relating to corresponding elements of the bit time-of-transition array, and using linear regression on the bit time-of-transition array with the emphasis. The emphasis array is formed from the signal amplitude, signal to interference ratio, or probability of a bit not being in error. One of several matched filters is dynamically selected based on the data content of the signal and used to detect bit transitions. The system has application in time varying multi-path fading environments. The system operates on signals with low SNR, high co-channel interference, or high intersymbol interference. Useful in transmitter identification, range finding, mobile transmitter location, and frequency hop intercept systems.
摘要翻译： 用于通过提取位时间转换阵列来测量数字调制信号的比特周期（或比特率或波特率或符号率）和比特时期（或符号时期）的系统，用其各个元素确定加强阵列 涉及比特时间转换阵列的相应元素，并且对具有强调的比特时间转换阵列使用线性回归。 强调阵列由信号幅度，信号与干扰比或位的概率不成误差构成。 基于信号的数据内容动态地选择几个匹配滤波器之一，并用于检测位转换。 该系统具有时变多路径衰落环境中的应用。 该系统对低信噪比，高同信道干扰或高符号间干扰的信号进行操作。 适用于发射机识别，测距，移动发射机位置和频跳拦截系统。
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