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81. 发明专利

CA3035363A1 SYSTEMS AND METHODS FOR REDUCING SIGNAL RADIATION IN AN UNWANTED DIRECTION 未知
公开(公告)号：CA3035363A1
公开(公告)日：2019-09-02
申请号：CA3035363
申请日：2019-03-01
申请人： PCTEL INC
发明人： LIN JESSE , NAVSARIWALA UMESH
IPC分类号： H01Q21/29 , H01Q3/16
摘要： An antenna system that can reduce signal radiation in an unwanted direction while preserving signal radiation outside of the unwanted direction is provided. The antenna system can include a signal input source with a main antenna and a secondary antenna each electrically coupled to the signal input source. The main antenna can transmit a primary signal to produce a primary radiation pattern in response to a first portion of energy from the signal input source, and the secondary antenna can transmit a secondary signal to produce a secondary radiation pattern in response to a second portion of energy from the signal input source. The secondary signal can be amplitude modified and phase shifted to position the secondary radiation pattern to cancel out or reduce a portion of the primary radiation pattern extending in an unwanted direction while substantially preserving portions of the primary radiation pattern outside of the unwanted direction.

82. 发明专利

MX2014007051A RECEPTOR DE INTERVALO DE SINTONIZACION AMPLIO. 未知
公开(公告)号：MX2014007051A
公开(公告)日：2015-03-25
申请号：MX2014007051
申请日：2014-06-12
申请人： PCTEL INC
发明人： LU WEI , KIM JOHN KYECHONG
IPC分类号： H03D7/14
摘要： Se proporciona un receptor de intervalo de sintonización amplio que consiste en un primer y segundo mezcladores y primer y segundo osciladores locales. El primer mezclador puede mezclar una señal de entrada con una señal procedente desde el primer oscilador local y producir una señal que tenga una primera frecuencia intermedia; el segundo mezclador puede mezclar la señal que tiene la primera frecuencia intermedia con una señal procedente del segundo oscilador local y producir una señal que tenga una segunda frecuencia intermedia, y por cada frecuencia de señal de entrada se puede fijar una relación entre el primero y segundo osciladores locales.

83. 发明专利

CA2854216A1 WIDE TUNING RANGE RECEIVER 未知
公开(公告)号：CA2854216A1
公开(公告)日：2014-12-12
申请号：CA2854216
申请日：2014-06-12
申请人： PCTEL INC
发明人： LU WEI , KIM JOHN KYECHONG
IPC分类号： H04B1/18
摘要： A wide tuning range receiver is provided that includes first and second mixers, and first and second local oscillators. The first mixer can mix an input signal with a signal from the first local oscillator and output a signal having a first intermediate frequency, the second mixer can mix the signal having the first intermediate frequency with a signal from the second local oscillator and output a signal having a second intermediate frequency, and, for each input signal frequency, a relationship between the first and second local oscillators can be fixed.

84. 发明专利

CA2527511C SYSTEMS AND METHODS FOR SEAMLESS ROAMING BETWEEN WIRELESS NETWORKS 未知
公开(公告)号：CA2527511C
公开(公告)日：2013-05-14
申请号：CA2527511
申请日：2003-08-06
申请人： PCTEL INC
发明人： NAIR BIJU , REDZIC OGNJEN , SINGER MARTIN H , BOXALL ROBERT F
IPC分类号： H04W36/14 , H04J3/16 , H04Q7/24 , H04W36/18 , H04W84/12
摘要： A method for the seamless switching of a wireless device between wireless wide area networks (WWANs) and wireless local area networks (WLANs) includes automatically detecting the available WWANs and WLANs, selecting one of the available networks for use by the wireless device, and connecting the wireless device to the selected network. The method also includes maintaining the network connectivity (112) by monitoring the connection and, upon determining that the connection has been lost (114), selecting another available network for use and connecting the wireless device the other network (120). Additionally, the method communicates information about the availability networks and connection status to a user of the wireless device, which allows the user to manually switch the wireless device connection from the automatically selected available network to another available network. Further, a wireless device implements the above-described method.

85. 发明专利

HK1133779A1 CELLULAR DRIVE TEST SYSTEM NETWORK 未知
公开(公告)号：HK1133779A1
公开(公告)日：2010-04-01
申请号：HK10101589
申请日：2010-02-11
申请人： PCTEL INC
发明人： DICKEY SERGEY L , SRIPADHAM SHANKAR
IPC分类号： H04W20090101
摘要： A method and apparatus is provided for processing wireless signals collected from a plurality of cellular base stations by a plurality of drive test units of a drive test system The method includes the steps of a first process within at least one of the plurality of drive test units processing and storing wireless signal samples in real time to identify and measure signals from the plurality of cellular base stations, the first process forming a target list of signals that could be identified and measured, a second process that processes the signals in near real time and a third process that processes signal offline. The first, second and third processes may share information irrespective of where executed, whether executed on a single drives test unit or multiple drive test units.

86. 发明专利

BRPI0606383A2 未知
公开(公告)号：BRPI0606383A2
公开(公告)日：2010-03-23
申请号：BRPI0606383
申请日：2006-02-07
申请人： PCTEL INC
发明人： LU WEI
IPC分类号： H04L27/14
摘要： An improved demodulation mechanism (and corresponding methods of operation) that demodulates a differentially-encoded GMSK signal in a manner that is accurate and efficient and with reduced complexity. The demodulation mechanism includes at least one buffer for storing sequences of in-phase and quadrature-phase baseband samples that carry the GMSK signal therein. A channel estimation block operates on the sequences of in-phase and quadrature-phase baseband samples to derive estimates for timing errors (preferably sample timing errors as well as carrier frequency and phase errors) in the samples. The channel estimation block uses the timing error estimates to transform the sequences of in-phase and quadrature-phase baseband samples to compensate for such timing errors. A de-rotation block operates on the transformed sequences to perform a de-rotation of pi/2 per symbol in the GMSK signal. The result of the de-rotation is a sequence of complex values each having a real part and an imaginary part. An estimation block uses the result of the de-rotation to derive an estimate for the bits in the GMSK signal. Such estimation is generated by adding a first contribution to a second contribution, the first contribution derived from an imaginary part of a first complex value, and the second contribution derived from a real part of a second complex number. The first and second complex values are spaced apart by one symbol. Such mechanisms and methodologies are readily adaptable for the demodulation of other pre-coded partial response signals.

87. 发明专利

HK1113612A1 METHOD AND APPARATUS FOR BEACON DISCOVERY IN A SPREAD SPECTRUM CELLULAR RADIO COMMUNICATION SYSTEM 未知
公开(公告)号：HK1113612A1
公开(公告)日：2008-10-10
申请号：HK08108671
申请日：2008-08-06
申请人： PCTEL INC
发明人： SOLTANIAN AMIR , PERIC MIRJANA , SRIVASTANA VIKASH
IPC分类号： H01Q20060101 , H04B20060101 , H04L20060101 , H04W20090101
摘要： An apparatus (and corresponding methodology) for discovering beacon signals in a spread spectrum radio communication system is selectively operable in one of two modes. The first mode employs a local reference timing signal, while the second mode employs a GPS-derived reference timing signal. Preferably, the first mode identifies a baseline beacon signal that satisfies a constraint based upon time delays for detected beacon signals which are indicative of the relative distance of the transmitting base stations, thus providing selection of a baseline beacon signal that originates from a relatively close base station. The index of the baseline beacon signal is recovered and then used together with relative timing derived from the local reference timing signal to assign indices to other detected beacon signals. In another aspect, control means is provided for selectively switching between the first and second modes in accordance with a plurality of user-selectable modes, which preferably include a GPS-priority mode (whereby the control means automatically switches between the first and second modes based upon GPS signal receive status) and an Indoor mode (whereby the control means operates in the first mode irrespective of GPS signal receive status).

88. 发明专利

CA2533214A1 SYSTEM AND METHOD FOR WAKE ON WIRELESS LAN 未知
公开(公告)号：CA2533214A1
公开(公告)日：2006-02-03
申请号：CA2533214
申请日：2004-07-22
申请人： PCTEL INC
发明人： SHU ZHENGJIN , HSU TSENG JAN
IPC分类号： G06F1/26 , G06F1/32 , H04L20060101 , H04W24/02
摘要： A system and method for energy conservation in wireless networks (1) include s techniques for powering down a Soft AP device (103) while still maintaining compliance with the "always on" requirement for access points in wireless networks. The system and method includes a technique for causing a host syst em (100) having a Soft AP device integrated therein to go into a low power, or energy conservation mode when no wireless activity has occurred over a predetermined period, and for monitoring to identify appropriate signals eve n while in the low power mode. If an appropriate signal is detected, a wake up signal is generated and the host system (100), including the Soft AP (103) device, is returned to normal functionality.

89. 发明专利

HK1056651A1 System and method of providing computer networking 未知
公开(公告)号：HK1056651A1
公开(公告)日：2004-02-20
申请号：HK03106922
申请日：2003-09-25
申请人： PCTEL INC
发明人： BOXALL ROBERT , MULABEGOVIC EMIR
IPC分类号： H04L12/24 , H04L29/06 , H04L29/12 , H04L
摘要： A method of bypassing proxy settings of a computing device on a network wherein the proxy settings do not correspond to the network, the method comprising the steps of receiving a request from the computing device in the form of a DNS or IP address, determining if the request is directed to a proxy server and responding to the request with the identification of a proxy server associated with the network.

90. 发明专利

AU2766601A Power supply circuits for data access arrangement enabling modem operation over a private line 未知
公开(公告)号：AU2766601A
公开(公告)日：2001-07-16
申请号：AU2766601
申请日：2001-01-05
申请人： PCTEL INC
发明人： MOON DAVID M
IPC分类号： G06F1/26 , H04B1/38
摘要： A power supply includes a dc voltage source and circuitry which powers a modem data access arrangement (DAA) while preventing dc voltages from being applied to a private line; i.e., the private line is effectively isolated from dc voltages generated by the voltage sources. The circuitry permits ac signals from the modem to travel substantially unhindered over the private line. A first embodiment includes a split winding transformer, and a capacitor coupled across the voltage source. A second embodiment includes a standard transformer, an inductor and a capacitor. A third embodiment includes two capacitors and two inductors. The capacitors are coupled to the inputs of the DAA, while the inductors are coupled between the poles of the voltage source and respective inputs of the DAA.

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