公开(公告)号：US5020076A

公开(公告)日：1991-05-28

申请号：US526156

申请日：1990-05-21

申请人： Stephen V. Cahill ,  Steven F. Gillig ,  Thomas J. Walczak

发明人： Stephen V. Cahill ,  Steven F. Gillig ,  Thomas J. Walczak

IPC分类号： H04B14/00 ,  H04L27/20

CPC分类号： H04B14/006 ,  H04L27/2075

摘要： A .pi./4-shift DQPSK modulator modulates a digitized voice signal and other information. An FM modulator modulates the analog voice signal and other information. The FM modulator is coupled to the quadrature mixers (109 and 110) of the .pi./4-shift DQPSK modulator. When an FM modulated signal is required, the mixers (109 and 110) are biased (114) to allow carrier feedthrough by applying a fixed, non-zero DC signal to one or both mixers (109 and 110). The carrier is then FM modulated using conventional methods such as voltage-modulation of a phase locked loop (PPL) (113). When .pi./4-shift DQPSK is to be generated, the conventional baseband I and Q vector-length signals (101 and 102) are applied to the mixers (109 and 110), and the carrier is left unmodulated by switching (115) out the input signal to the PLL (113). The PPL (113) will then generate only the carrier frequency to be mixed with the I and Q vector-length signals (101 and 102).

摘要翻译： pi / 4位DQPSK调制器调制数字化语音信号和其他信息。 FM调制器调制模拟语音信号和其他信息。 FM调制器耦合到pi / 4位DQPSK调制器的正交混频器（109和110）。 当需要FM调制信号时，通过向一个或两个混频器（109和110）施加固定的非零DC信号，混频器（109和110）被偏置（114）以允许载波馈通。 然后使用诸如锁相环（PPL）（113）的电压调制的常规方法对载波进行FM调制。 当要生成pi / 4位DQPSK时，传统的基带I和Q向量长度信号（101和102）被施加到混频器（109和110），并且通过切换（115）输出使载波不被调制 输入到PLL（113）的信号。 然后，PPL（113）将仅生成要与I和Q矢量长度信号（101和102）混合的载波频率。

公开(公告)号：US5621763A

公开(公告)日：1997-04-15

申请号：US440854

申请日：1995-05-15

申请人： Thomas J. Walczak ,  Robert I. Greene ,  Stephen V. Cahill ,  John W. Diehl

发明人： Thomas J. Walczak ,  Robert I. Greene ,  Stephen V. Cahill ,  John W. Diehl

IPC分类号： H04L27/20 ,  H03G3/20 ,  H03G3/30 ,  H04B7/005 ,  H04L27/04

CPC分类号： H04W52/04 ,  H03G3/3047

摘要： An apparatus and method generates a shaped transition between the minimum and maximum output power levels of a transmitter (500). When the transmitter is turned on a stepped transition (415) is generated at the beginning (3) of the transition region (409) followed by a shaped transition (417) to the end (6) of the transition region (409). When the transmitter (500) is turned off a shaped transition region (417') is generated at the beginning (162) of the transition region (411) followed by a stepped transition (415') at the end (3) of the transition region (411). The stepped transition (415 or 415') is generated by adjusting a voltage controlled attenuator (545) and the bias of a power amplifier (545) in the transmitter (500). The shaped transition (417 or 417') is generated by processing transmitted information through finite impulse response filters (507 or 509) before or after the time slot permitted for transmitting information.

摘要翻译： 一种装置和方法产生在发射器（500）的最小和最大输出功率电平之间的形状转换。 当发射机接通时，在过渡区域（409）的开始处（3）产生阶跃转变（415），随后是到过渡区域（409）的端部（6）的成形过渡（417）。 当发射机（500）关闭时，在过渡区域（411）的开始处（162）产生形状的过渡区域（417'），随后在转变的端部（3）处形成阶梯式转换（415'） 区域（411）。 通过调节压控衰减器（545）和发射器（500）中的功率放大器（545）的偏置来产生阶跃转换（415或415'）。 通过在允许发送信息的时隙之前或之后通过有限脉冲响应滤波器（507或509）处理发送的信息来生成形状转换（417或417'）。

公开(公告)号：US5187809A

公开(公告)日：1993-02-16

申请号：US896462

申请日：1992-06-08

申请人： Randall W. Rich ,  Rashid M. Osmani ,  Thomas J. Walczak ,  Stephen V. Cahill

发明人： Randall W. Rich ,  Rashid M. Osmani ,  Thomas J. Walczak ,  Stephen V. Cahill

IPC分类号： H03G3/20

CPC分类号： H03G3/3036 ,  H03G3/3052 ,  H03G3/3068

摘要： A gain control system for controlling signal levels of the signal received by a receiver. The gain control system is operable to control the signal levels of the signal when the signal is comprised of either a conventional, constant envelope signal, such as an FM signal, or a non-constant envelope signal, such as a TDMA composite modulated signal. The gain control system may be advantageously embodied in a dual-mode radiotelephone operable to receive both conventional, FM signals and TDMA, composite modulated signals.

摘要翻译： 一种用于控制由接收机接收的信号的信号电平的增益控制系统。 增益控制系统可操作以在信号由传统的恒定包络信号（例如FM信号）或诸如TDMA复合调制信号的非恒定包络信号组成时控制信号的信号电平。 增益控制系统可以有利地体现在双模式无线电话中，可操作以接收传统的FM信号和TDMA，复合调制信号。

公开(公告)号：US5193223A

公开(公告)日：1993-03-09

申请号：US920178

申请日：1992-07-27

申请人： Thomas J. Walczak ,  Stephen V. Cahill

发明人： Thomas J. Walczak ,  Stephen V. Cahill

IPC分类号： H03G3/20 ,  H04B1/04 ,  H04B1/40 ,  H04B1/56 ,  H04B7/005

CPC分类号： H04W52/52 ,  H03G3/3047 ,  H04B1/40 ,  H04B1/403 ,  H04B1/56

摘要： A TDMA cellular telephone (600) includes in its transmit signal path, microphone (608), vocoder (612), data format circuitry (601), quadrature modulator (602), 90 MHz local oscillator (606), transmitter with mixer (604), transmitter filter (618), and antenna (620). In its receive signal path, the TDMA cellular telephone (600) includes receiver filter (622) coupled to antenna (620), quadrature demodulator (624), and data deformat circuitry (625). The channel frequency of TDMA cellular telephone (600) is loaded into synthesizer (616) by microcomputer (614) and applied to transmitter (604) and demodulator (624). TDMA cellular telephone (600) is controlled by microcomputer (614) which includes a memory with a control and signaling computer program stored therein. Transmitter (604) includes novel power control circuitry (100) comprised of variable gain stage (104), mixer (106), bandpass filter (109), and directional coupler (112) in a forward path, and detector (116), A/D converter (118 ), digital controller (120), and D/A converter (126) in a feedback path.

摘要翻译： TDMA蜂窝电话（600）在其发射信号路径中包括麦克风（608），声码器（612），数据格式电路（601），正交调制器（602），90MHz本地振荡器（606），具有混频器 ），发射机滤波器（618）和天线（620）。 在其接收信号路径中，TDMA蜂窝电话（600）包括耦合到天线（620），正交解调器（624）和数据去格局电路（625）的接收机滤波器（622）。 TDMA蜂窝电话（600）的信道频率由微计算机（614）加载到合成器（616）中并应用于发射机（604）和解调器（624）。 TDMA蜂窝电话（600）由微计算机（614）控制，微计算机（614）包括其中存储有控制和信令计算机程序的存储器。 发射器（604）包括由前向路径中的可变增益级（104），混频器（106），带通滤波器（109）和定向耦合器（112）组成的新型功率控制电路（100），以及检测器 / D转换器（118），数字控制器（120）和D / A转换器（126）。

公开(公告)号：US5163159A

公开(公告)日：1992-11-10

申请号：US559775

申请日：1990-07-30

申请人： Randall W. Rich ,  Rashid M. Osman ,  Thomas J. Walczak ,  Stephen V. Cahill

发明人： Randall W. Rich ,  Rashid M. Osman ,  Thomas J. Walczak ,  Stephen V. Cahill

IPC分类号： H03J7/06 ,  H04B1/40 ,  H04L27/227 ,  H04Q7/22 ,  H04Q7/24 ,  H04Q7/26 ,  H04Q7/30 ,  H04Q7/36 ,  H04Q7/38

CPC分类号： H04B1/0032 ,  H03J7/065 ,  H04B1/0003 ,  H04B1/406 ,  H04L27/2272

摘要： A frequency control system for a dual-mode radiotelephone (152-238; 252-320) operative to receive either an FM signal or a DQPSK signal. In a first embodiment, when operative to receive the FM signal, the frequency of the reference oscillator (192) of the radiotelephone (152-222) is maintained in a fixed relation with the frequency of the FM signal. When operative to receive the DQPSK signal, the reference oscillator (192) is maintained in a fixed relation with the frequency of the DQPSK signal as determined by a digital signal processor (212). In a second embodiment, when operative to receive the FM signal, the frequency of an offset control oscillator (320) is maintained in a fixed relation with the frequency of the FM signal. When operative to receive the DQPSK signal, the reference oscillator (292) is maintained in a fixed relation with the frequency of the DQPSK signal as determined by a digital signal processor (312).

摘要翻译： 一种用于双模式无线电话（152-238; 252-320）的频率控制系统，其操作以接收FM信号或DQPSK信号。 在第一实施例中，当操作以接收FM信号时，无线电话（152-222）的参考振荡器（192）的频率与FM信号的频率保持固定关系。 当操作以接收DQPSK信号时，参考振荡器（192）与由数字信号处理器（212）确定的DQPSK信号的频率保持固定的关系。 在第二实施例中，当操作以接收FM信号时，偏移控制振荡器（320）的频率与FM信号的频率保持固定关系。 当操作以接收DQPSK信号时，参考振荡器（292）与由数字信号处理器（312）确定的DQPSK信号的频率保持固定的关系。

公开(公告)号：US5493714A

公开(公告)日：1996-02-20

申请号：US496492

申请日：1995-06-29

申请人： Stephen V. Cahill

发明人： Stephen V. Cahill

IPC分类号： H03J7/06 ,  H04B1/26 ,  H04B1/16

CPC分类号： H04B1/0007 ,  H03J7/065 ,  H04B1/0003 ,  H04B1/26

摘要： An apparatus and method for automatically controlling a reference frequency (120) in a receiver (104) that receives either analog (116) or digital (136) information signals. The receiver (18) includes a frequency translator (109) for translating a carrier frequency (137) to an intermediate frequency (118) and maintaining the intermediate frequency (118) at a desired value responsive to the reference frequency (120). A first measure of frequency error (211, 212) is detected between the reference frequency (120) and the intermediate frequency (118). A second measure of frequency error (125, 126) is detected between the reference frequency (120) and the intermediate frequency (118). A current signal (213) is produced responsive to the first measure of frequency error (211, 212) when the receiver receives the analog information signal (116) and responsive to the second measure of frequency error (125, 126) when receiver receives the digital information signal (136). A frequency control signal (130) is produced responsive to the current signal (213) to automatically control thereby the reference frequency (120) when the receiver (18) receives either analog (116) or digital (136) information signals.

摘要翻译： 一种用于在接收模拟（116）或数字（136）信息信号的接收机（104）中自动控制参考频率（120）的装置和方法。 接收器（18）包括频率转换器（109），用于将载波频率（137）转换到中频（118）并且将中频（118）保持在响应于参考频率（120）的期望值。 在参考频率（120）和中频（118）之间检测频率误差（211,212）的第一测量。 在参考频率（120）和中间频率（118）之间检测频率误差（125,126）的第二测量。 当接收机接收模拟信息信号（116）并响应于接收机接收到的频率误差的第二测量值（125,126）时，响应于第一测量频率误差（211,212）产生电流信号（213） 数字信息信号（136）。 当接收器（18）接收模拟（116）或数字（136）信息信号时，响应于当前信号（213）产生频率控制信号（130）以自动控制参考频率（120）。

公开(公告)号：US20110287795A1

公开(公告)日：2011-11-24

申请号：US12782940

申请日：2010-05-19

申请人： Stephen V. Cahill

发明人： Stephen V. Cahill

IPC分类号： H04B7/00

CPC分类号： H04L5/006 ,  H04B17/318 ,  H04L5/0005 ,  H04L5/0069 ,  H04W24/10 ,  H04W72/02

摘要： Methods and apparatuses for optimized channel selection are disclosed. In one example, a channel quality is measured of each channel of an available number of channels on which a mobile communication device can transmit and receive. A subset of the available number of channels is allocated to a long range channel class responsive to the channel quality. An RSSI of the mobile communication device is monitored and correlated to a mobile communication device proximity to a base station. A channel is selected from the long range channel class if the mobile communication device proximity is greater than a predetermined proximity.

摘要翻译： 公开了用于优化信道选择的方法和装置。 在一个示例中，测量移动通信设备可以在其上发送和接收的可用数量的信道的每个信道的信道质量。 响应于信道质量，可用信道数量的子集被分配给长距离信道类别。 监视移动通信设备的RSSI并将其与靠近基站的移动通信设备相关联。 如果移动通信设备的接近度大于预定的接近度，则从远程信道类别中选择一个信道。

公开(公告)号：US5263055A

公开(公告)日：1993-11-16

申请号：US787489

申请日：1991-11-04

申请人： Stephen V. Cahill

发明人： Stephen V. Cahill

IPC分类号： H03B1/04 ,  H03D1/04 ,  H04B1/52 ,  H03D1/06 ,  H03K5/01 ,  H03K6/04

CPC分类号： H03D1/04 ,  H03B1/04 ,  H04B1/52 ,  H03D2200/0086

摘要： An apparatus and method therefor substantially reducing the interference of a harmonic frequency component (301) of a clock signal with a filtered received signal (302), comprises a frequency spreading signal generator (127) and a signal modulator (125). The frequency spreading signal generator (127) produces a frequency spreading signal (130). The signal modulator (125) modulates the clock signal, produced by a clock signal generator (129), with the frequency spreading signal (130) to produce a modulated clock signal (131) including a modulated harmonic frequency component (303). The power level of a modulated harmonic frequency component (303), corresponding to the harmonic frequency component interfering with the filtered signal (202-204), is spread over a frequency bandwidth (f.sub.6 -f.sub.7) greater than the predetermined frequency bandwidth (f.sub.4 -f.sub.5) causing the power level of the modulated harmonic frequency component (303) within the predetermined frequency bandwidth (f.sub.4 -f.sub.5) to decrease.

摘要翻译： 一种用于基本上减少时钟信号的谐波频率分量（301）与滤波的接收信号（302）的干扰的装置和方法包括频率扩展信号发生器（127）和信号调制器（125）。 频率扩展信号发生器（127）产生频率扩展信号（130）。 信号调制器（125）利用频率扩展信号（130）调制由时钟信号发生器（129）产生的时钟信号，以产生包括调制谐波频率分量（303）的调制时钟信号（131）。 对应于与滤波信号（202-204）相干扰的谐波频率分量的调制谐波频率分量（303）的功率电平在大于预定频带宽度（f4-f7）的频带宽度（f6-f7） f5）使预定频带宽度（f4-f5）内的调制谐波频率分量（303）的功率电平降低。

公开(公告)号：US5204974A

公开(公告)日：1993-04-20

申请号：US719213

申请日：1991-06-21

申请人： Stephen V. Cahill

发明人： Stephen V. Cahill

摘要： A system, and associated method, for measuring a signal level of a signal received by a receiver, such as a radio telephone. The signal received by the receiver is applied to a variable amplifier. The amplification of the variable amplifier is adjusted such that an amplified signal generated therefrom is within the dynamic range of an intermediate frequency circuit. The level of amplification required to position the signal level of the amplified signal within the dynamic range of the intermediate frequency circuit is measured, and the signal level of the signal received by a receiver is calculated.

公开(公告)号：US20110269502A1

公开(公告)日：2011-11-03

申请号：US12769368

申请日：2010-04-28

申请人： Mark Clark ,  Steve C. Evans ,  Stephen V. Cahill

发明人： Mark Clark ,  Steve C. Evans ,  Stephen V. Cahill

IPC分类号： H04M1/00

CPC分类号： H04W72/048 ,  H04B1/006 ,  H04M1/72505 ,  H04M2250/08 ,  H04W88/06

摘要： Methods and apparatuses for multiple RF band operation in mobile devices are disclosed. In one example, a method for dual radio frequency band operation includes operating a mobile communication device in a first radio frequency band, monitoring a RSSI associated with the mobile communication device, and switching operation of the mobile communication device to operation in a second radio frequency band responsive to the RSSI crossing a threshold RSSI value.

摘要翻译： 公开了用于移动设备中的多个RF频带操作的方法和装置。 在一个示例中，一种用于双无线电频带操作的方法包括操作第一无线电频带中的移动通信设备，监视与移动通信设备相关联的RSSI，以及将移动通信设备的操作切换到第二射频 响应于RSSI跨越阈值RSSI值。