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1.发明授权Method and apparatus for imbalance-free FM demodulation in direct conversion radio receivers 有权直接转换无线电接收机中不平衡调频解调的方法和装置公开(公告)号：US08442474B2
公开(公告)日：2013-05-14
申请号：US12844961
申请日：2010-07-28
IPC分类号： H04B1/16
CPC分类号： H04B1/30 , H03D3/009 , H03D2200/0047 , H03D2200/0082 , H03G3/3052
摘要： An apparatus and method for demodulating an FM RF signal is presented. An Adaptive Differentiate Cross Multiply (ADCM) system in which the energy estimate of the desired on-channel RF is generated using adaptive filtering. The adaptive filter includes low pass filtering of the instantaneous energy estimate. The bandwidth of the LPF is adjusted in real time based on the received signal strength energy estimate, the periodicity of any changes in the energy estimate, AGC setting for the receiver, and/or the type of sub-audible signaling applied to the RF signal if known. After the bandwidth is set, the optimum filtered energy estimate is applied to the system to demodulate the received information free from distortion artifacts associated with IQ imbalance. A normalized signal in the ADCM system is clipped by a limiter whose clipping threshold is equal to a maximum gain of differentiators in the ADCM system.
摘要翻译： 提出了一种用于解调FM RF信号的装置和方法。 自适应差分交叉乘法（ADCM）系统，其中使用自适应滤波来生成期望的同信道RF的能量估计。 自适应滤波器包括瞬时能量估计的低通滤波。 基于接收到的信号强度能量估计，能量估计的任何变化的周期性，接收机的AGC设置和/或应用于RF信号的子听觉信号的类型，实时地调整LPF的带宽 如果已知。 在设置带宽之后，将最佳滤波能量估计值应用于系统以解调所接收到的信息，而不存在与IQ失衡相关的失真伪像。 ADCM系统中的归一化信号由限幅器限幅，其限幅阈值等于ADCM系统中微分器的最大增益。
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公开(公告)号：US08259858B2
公开(公告)日：2012-09-04
申请号：US12512185
申请日：2009-07-30
IPC分类号： H04L25/06
CPC分类号： H04L25/06 , H03G3/3068 , H04L27/0014 , H04L27/38 , H04L27/3809 , H04L27/3863
摘要： A method of detecting an on-channel signal and synchronizing signal detection with correcting for DC offset errors in a direct conversion receiver is presented. A received signal is digitized, and a state machine operates to detect the presence of an on-channel signal. If the signal is not detected, a mixed mode training sequence is initiated in which the DC offset errors in both an analog and digital received signal path are corrected. While training, processing of the digitized samples by a digital signal processor and a host controller is suspended (while they are put into battery save mode) and the gain provided to subsequently received signals is minimized. The DC offset correction circuitry is bypassed and put into battery save mode at predetermined periods when DC offset correction is not performed.
摘要翻译： 提出了一种在直接转换接收机中检测通道信号和同步信号检测与校正直流偏移误差的方法。 接收到的信号被数字化，并且状态机操作以检测是否存在通道信号。 如果未检测到信号，则开始混合模式训练序列，其中校正模拟和数字接收信号路径中的DC偏移误差。 在训练时，由数字信号处理器和主机控制器处理数字化采样被暂停（当它们进入电池保存模式时），并且提供给随后接收到的信号的增益被最小化。 直流偏移校正电路被旁路，并且在不执行直流偏移校正的预定周期中进入省电模式。
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公开(公告)号：US5651030A
公开(公告)日：1997-07-22
申请号：US696466
申请日：1991-05-06
申请人： Chin-Pan Wong , Richard S. Young
发明人： Chin-Pan Wong , Richard S. Young
CPC分类号： H04B1/66
摘要： Briefly, according to the invention, a receiver (100) for receiving and decoding a carder signal is described. A carrier signal is modulated with an information signal which has one of a plurality of formats. The receiver includes a circuit (104) for receiving and demodulating the carrier signal to produce a demodulated signal. The receiver (100) also includes a digital signal processing subsystem (108) for calculating the correlation function of the demodulated signal and based on this correlation function classifies the format of the demodulated signal. A decoder (118) is further included in the receiver (100) to decode the demodulated signal once it has been classified.
摘要翻译： 简而言之，根据本发明，描述了用于接收和解码卡片信号的接收机（100）。 用具有多种格式之一的信息信号调制载波信号。 接收机包括用于接收和解调载波信号以产生解调信号的电路（104）。 接收器（100）还包括用于计算解调信号的相关函数的数字信号处理子系统（108），并且基于该相关函数对解调信号的格式进行分类。 解码器（118）还包括在接收机（100）中，以便一旦被分类就对解调信号进行解码。
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公开(公告)号：USD243027S
公开(公告)日：1977-01-11
申请号：US421056
申请日：1973-12-03
申请人： Richard S. Young , Leo E. Hearn
设计人： Richard S. Young , Leo E. Hearn
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公开(公告)号：US08483703B2
公开(公告)日：2013-07-09
申请号：US11273420
申请日：2005-11-14
IPC分类号： H04W24/00
CPC分类号： H04W64/00
摘要： A radio system for locating a radio transceiver configured to exchange voice or data with a plurality of base stations on a narrowband channel is described. The system includes the radio transceiver that exchanges voice or data on the narrowband channel with a base station of the plurality of base stations and also to periodically transmit a chirp signal to the plurality of base stations. The radio system also includes the plurality of base stations each with a matched filter configured to receive the periodically transmitted chirp signal and to triangulate a location of the radio transceiver using the received chirp signal.
摘要翻译： 描述用于定位被配置为在窄带信道上与多个基站交换语音或数据的无线电收发机的无线电系统。 该系统包括：无线电收发器，其与多个基站中的基站在窄带信道上交换语音或数据，并且还周期性地向多个基站发送线性调频信号。 无线电系统还包括多个基站，每个基站具有配置成接收周期性发送的线性调频信号的匹配滤波器，并且使用所接收的线性调频信号对无线电收发信机的位置进行三角测量。
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公开(公告)号：US07174168B2
公开(公告)日：2007-02-06
申请号：US10893654
申请日：2004-07-16
申请人： David E. Klein , Richard S. Young
发明人： David E. Klein , Richard S. Young
摘要： A public/private communication system is provided which includes a public communication device 100, a private communication device (102) and a radio accessory extension (RAE) 200 coupled therebetween. The RAE (200) of the present invention provides audio and/or display capability which allows the public communication device to operate as a private communication accessory. Methods (300, 400 500) provide for the configuration and prioritization of private and public calls through the three devices to ensure that private calls will take priority and public calls will be received on the public communication device and handled appropriately.
摘要翻译： 提供了一种公共/专用通信系统，其包括公共通信设备100，专用通信设备（102）和耦合在其间的无线电附件扩展（RAE）200。 本发明的RAE（200）提供音频和/或显示能力，其允许公共通信设备作为私人通信配件进行操作。 方法（300,400500）通过三种设备提供私人和公共呼叫的配置和优先级，以确保私人呼叫优先，公共电话将被接收到公共通信设备上并妥善处理。
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7.发明授权公开(公告)号：US07203476B2
公开(公告)日：2007-04-10
申请号：US10754654
申请日：2004-01-09
IPC分类号： H04B1/26
摘要： An adaptive dc compensation technique (100) eliminates dc error for both digital and constant envelope modulation protocols (108). For analog modulation, a dc averaging technique utilizes piece-wise continuous dc averaging (110) that calculates discrete dc error values over a variable number of samples (112) and updates the dc compensation value as a fixed value for a specified sample length (114). The piece-wise “update-and-hold” technique (110) results in a pseudo high pass filter response with an equivalent corner. For digital modulation, a continuous high pass filter section of the receiver is enabled (120).
摘要翻译： 自适应直流补偿技术（100）消除数字和恒定包络调制协议（108）的直流误差。 对于模拟调制，直流平均技术使用分段连续直流平均（110），其在可变数量的样本（112）上计算离散直流误差值，并将直流补偿值更新为指定样本长度的固定值（114 ）。 分段式“更新和保持”技术（110）导致具有等效角的伪高通滤波器响应。 对于数字调制，使能接收器的连续高通滤波器部分（120）。
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公开(公告)号：US06754284B2
公开(公告)日：2004-06-22
申请号：US10225982
申请日：2002-08-22
IPC分类号： H04L2712
CPC分类号： H04L27/2614 , H04L5/06 , H04L27/2627
摘要： A modulator (102) modulates a plurality of symbols to create a modulated signal. A transmitter is coupled to the modulator (102). The transmitter transmits the modulated signal if the modulated signal is above a threshold. A minima enlarger (104) is coupled to the modulator (102). The minima enlarger (104) computes an adjustment to the plurality of symbols if the modulated signal is below the threshold. A summer (106) is coupled to the modulator (102) and the minima enlarger (104). The summer (106) adds the adjustment to the plurality of symbols if the modulated signal is below the threshold.
摘要翻译： 调制器（102）调制多个符号以产生调制信号。 发射机耦合到调制器（102）。 如果调制信号高于阈值，则发射机发射调制信号。 最小放大器（104）耦合到调制器（102）。 如果调制信号低于阈值，则最小放大器（104）计算对多个符号的调整。 夏季（106）耦合到调制器（102）和最小放大器（104）。 如果调制信号低于阈值，则加法器（106）将该调整添加到多个符号。
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公开(公告)号：US08565145B2
公开(公告)日：2013-10-22
申请号：US12968443
申请日：2010-12-15
申请人： Shakeeb Z. Khan , Joseph J. Medvid, III , Charles R. Ruelke , Richard S. Young , Branko L. Avanic , Lorenzo Cruger , Tan V. Dinh , Mahes M. Ekanayake , Armando J. Gonzalez
发明人： Shakeeb Z. Khan , Joseph J. Medvid, III , Charles R. Ruelke , Richard S. Young , Branko L. Avanic , Lorenzo Cruger , Tan V. Dinh , Mahes M. Ekanayake , Armando J. Gonzalez
IPC分类号： H04B7/14
摘要： A method for transmitting a communication generated by an originating device to a target device using a repeating device is provided. In the method the communication is transmitted from the originating device and received at the repeating device. A repeater request sequence is transmitted from the originating device and retransmitted from the first repeating device to the target device before the repeater request sequence is received at the first repeating device.
摘要翻译： 提供了一种用于使用重复装置将由始发设备生成的通信发送到目标设备的方法。 在该方法中，通信从始发设备发送并在重复设备处接收。 在第一重复设备接收到中继器请求序列之前，从始发设备发送中继器请求序列，并从第一中继设备重传到目标设备。
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公开(公告)号：US08295825B2
公开(公告)日：2012-10-23
申请号：US12957190
申请日：2010-11-30
申请人： Ellis A. Pinder , Branko L. Avanic , Lorenzo J. Cruger , Tan V. Dinh , Mahes M. Ekanayake , Armando J. Gonzalez , Joseph P. Heck , Shakeeb Z. Khan , Joseph J. Medvid, III , Wayne M. Phang , Charles R. Ruelke , Dang N. Vu , Richard S. Young
发明人： Ellis A. Pinder , Branko L. Avanic , Lorenzo J. Cruger , Tan V. Dinh , Mahes M. Ekanayake , Armando J. Gonzalez , Joseph P. Heck , Shakeeb Z. Khan , Joseph J. Medvid, III , Wayne M. Phang , Charles R. Ruelke , Dang N. Vu , Richard S. Young
IPC分类号： H04W4/00
CPC分类号： H04W76/40
摘要： Methods of enabling late entry into an on-going spread spectrum call are described. A late join frame replaces, and has the same size as, a traffic frame. A late join slot in the late join frame contains sufficient information in preamble and sync subframes to permit a target to join the call. The traffic slots in the late join frame replicate data such that call quality of the call is substantially unaffected if one of the remaining traffic frames is not received. The preamble and sync subframes frequencies may be the same as, or different from, preamble and sync frames frequencies during a call establishment phase of the call. If different, the preamble and sync subframes frequencies are selected from one or more frequencies. Use of the preamble and sync subframes frequencies is compensated for when selecting the traffic slot frequencies to obtain uniform utilization of the spectrum.
摘要翻译： 描述了能够延迟进入正在进行的扩频呼叫的方法。 后期连接框架替换并具有与交通帧相同的大小。 晚连接帧中的延迟加入时隙包含前导码和同步子帧中足够的信息，以允许目标方加入呼叫。 后期加入帧中的业务时隙复制数据，使得如果未接收到剩余业务帧之一，则呼叫的呼叫质量基本上不受影响。 前导码和同步子帧频率可以在呼叫的呼叫建立阶段期间与前同步码和同步帧频率相同或不同。 如果不同，则从一个或多个频率中选择前同步码和同步子帧频率。 当选择业务时隙频率以获得频谱的均匀利用时，对前导码和同步子帧频率的使用进行补偿。
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