公开(公告)号：CA2207745C

公开(公告)日：2004-10-26

申请号：CA2207745

申请日：1995-12-11

Applicant: QUALCOMM INC

Inventor： PETERZELL PAUL E ,  KORNFELD RICHARD K ,  WEILAND ANA L ,  WHEATLEY CHARLES E III

IPC: H04B1/06 ,  H03G1/00 ,  H03G3/30 ,  H04B20060101 ,  H04B1/10 ,  H04B1/16 ,  H04B1/18 ,  H04B1/40 ,  H04B1/7075 ,  H04B1/7097 ,  H04B3/06 ,  H04B7/005 ,  H04B7/26 ,  H04B15/00 ,  H04Q7/32

Abstract: The method and apparatus of the present invention improve the immunity to interference of a radio receiver. The power level of a received signal is detected. If the power level meets or exceeds a predetermined power threshold, the low noise amplifier (703) is by-passed (730), thus increasing the intercept point of the receiver components. Alternative embodiments include the use of an RF power detector (105) to control the front-end gain (110) as a function of jammer power. In lieu of a switchable RF gain block (730), several methods of continuous gain control are proposed. Continuous gain control allows the interference suppression and sensitivity of the receiver to be adjusted at lower signal levels than the switchable gain block. A method of the present invention adjusts the input gain by a predetermined amount (1601). The receiver processing measures the gain change in the IF signal power (1605). If the change is less than the predetermined amount (1610), the CDMA signal and jammers are below the noise floor and, therefore, the gain is increased (1615). If the IF signal power change is greater than the predetermined amount, the interference is evident and the gain is reduced to reduce the intermodulation products (1620). This process is used until the receiver is operating at the best compromise between interference and noise figure.

公开(公告)号：AT237887T

公开(公告)日：2003-05-15

申请号：AT96944497

申请日：1996-12-26

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K ,  WHEATLEY CHARLES E III ,  CAMARILLO RICHARD J ,  WHITE KATHERINE W

IPC: H03F99/00 ,  H03F1/02 ,  H03F1/32 ,  H03F3/60 ,  H03F3/68 ,  H03F3/72 ,  H03G3/02 ,  H03G3/30 ,  H04B1/04 ,  H04B7/26 ,  H04J13/00

Abstract: An amplifier circuit for providing an amplified signal in response to an input signal. The amplifier circuit includes an input network for applying the input signal to a selected at least one of a plurality of amplifier stages. An output network is provided for coupling the amplified signal from the selected at least one amplifier stage. The appropriate amplifier stage is selected by a control circuit in response to a desired power value of the amplified signal. By selectively activating only the amplifier stage(s) that are necessary to provide the desired level of output power, increased DC efficiency can be accomplished in applications that require an amplifier which operates linearly over a wide dynamic range.

公开(公告)号：MY114998A

公开(公告)日：2003-03-31

申请号：MYPI9600743

申请日：1996-02-29

Applicant: QUALCOMM INC

Inventor： MARTIN CHRISTOPHER B ,  KORNFELD RICHARD K ,  GREGORY SHERMAN

IPC: H04B3/36 ,  H04B1/06 ,  H04B1/38 ,  H04B7/00 ,  H04B7/005

Abstract: A TRANSCEIVER SYSTEM FOR INTERFACING DIGITAL MODEMS WITH RADIO FREQUENCY SIGNALS IS DESCRIBED. THE TRANSCEIVER SYSTEM INCLUDES AN ANTENNA, AN ANTENNA INTERFACE SYSTEM AND MODEM INTERFACE SYSTEM SEPARATED BY A CABLE. THE ANTENNA IS PLACED IN A LOCATION HAVING OPTIMAL RECEPTION SUCH AS THE ROOF OF A BUILDING AND IN CLOSE PROXIMITY TO THE ANTENNA INTERFACE SYSTEM. THE CABLE COUPLES THE ANTENNA INTERFACE SYSTEM TO THE MODEM INTERFACE SYSTEM WHICH IS PLACED WITHIN THE BUILDING SO THAT IT MAY BE EASILY ACCESSED FOR SERVICE AND CONFIGURATION AND SO THAT IT MAY BE COUPLED TO THE MODEMS. THE MODEM INTERFACE SYSTEM INCLUDES A TWO STATE VARIABLE ATTENUATOR AND AN ATTENUATION REGISTER THAT ARE CONFIGURED TO EITHER REDUCE THE STRENGTH OF THE RECEIVE (RX) SIGNAL WHEN THE MODEMS ARE LOCATED NEAR A BASE STATION, OR TO TRANSMIT THE RX SIGNAL WITHOUT ATTENUATION WHEN THE CONCENTRATED SUBSCRIBER UNIT IS AT A MORE DISTANT LOCATION. THE OUTGOING, OR TRANSMIT (TX), SIGNAL IS ALSO ATTENUATED IN A SIMILAR MANNER TO THE INCOMING SIGNAL. ONCE THE TRANSCEIVER SYSTEM IS PUT IN PLACE, A SIGNAL LOSS DETECTION SYSTEM FIXES THE AMOUNT OF SIGNAL LOSS EXPERIENCED BY THE INCOMING SIGNAL BEFORE BEING SUPPLIED TO THE MODEMS OVER CHANGING ENVIRONMENTAL CONDITIONS. THE SIGNAL LOSS DETECTION SYSTEMS INCLUDES A DETECTOR LOCATED IN THE MODEM INTERFACE SYSTEM THAT RECEIVES AN OSCILLATING SIGNAL TRANSMITTED FROM THE ANTENNA INTERFACE SYSTEM THROUGH THE COAXIAL CABLE. A DIFFERENTIAL INTEGRATOR THEN DETERMINES THE AMOUNT OF SIGNAL LOSS EXPERIENCED BY THIS OSCILLATING SIGNAL BY TRANSMISSION THROUGH THE COAXIAL CABLE AND ATTENUATES THE SIGNAL FROM THE ANTENNA INTERFACE SYSTEM ACCORDINGLY SO THE AMOUNT OF LOSS EXPERIENCED REMAINS CONSTANT OR IS NORMALIZED. ADDITIONALLY, DC POWER IS TRANSMITTED FROM THE MODEM INTERFACE SYSTEM TO THE ANTENNA INTERFACE SYSTEM THROUGH THE COAXIAL CABLE. THE ANTENNA INTERFACE SYSTEM ALLOWS MULTIPLE MODEMS TO GENERATE A SIGNAL USING A SINGLE POWER AMPLIFIER CIRCUIT BY INCLUDING A MAXIMUM POWER LIMITING SYSTEM THAT DETECTS WHEN THE SIGNAL BEING GENERATED EXCEEDS THE CAPACITY OF THE TRANSMIT POWER AMPLIFIER, AND THAT TRANSMIT AN ALARM SIGNAL TO THE MODEM INTERFACE SYSTEM IN RESPONSE SO THAT THE MODEM INTERFACE SYSTEM CAN SIGNAL THE REST OF THE CONCENTRATED SUBSCRIBER SYSTEM.

公开(公告)号：MY114796A

公开(公告)日：2003-01-31

申请号：MYPI9603598

申请日：1996-08-29

Applicant: QUALCOMM INC

Inventor： PITTA THOMAS A ,  WEILAND ANA L ,  PETERZELL PAUL E ,  WALLACE RAYMOND C ,  KORNFELD RICHARD K

IPC: H01Q1/50 ,  H01P1/213 ,  H03H7/46 ,  H04B1/40

Abstract: A DUAL-BAND ANTENNA SYSTEM FOR USE IN A PORTABLE COMMUNICATIONS DEVICE IS DISCLOSED HEREIN. THE ANTENNA SYSTEM INCLUDES AN ANTENNA ELEMENT FOR RADIATING ELECTROMAGNETIC ENERGY WITHIN LOW-BAND AND HIGH-BAND WAVELENGTH RANGES. IN A PREFERRED EMBODIMENT, A LOW-BAND ISOLATOR NETWORK, COUPLED TO THE ANTENNA ELEMENT, PROVIDES SIGNAL ISOLATION BETWEEN HIGH-BAND AND LOW-BAND SIGNAL PATHS DURING HIGH-BAND OPERATION. SIMILARLY, A HIGH-BAND ISOLATOR NETWORK PROVIDES SIGNAL ISOLATION, DURING OPERATION OVER THE LOW-BAND RANGE OF WAVELENGTHS, BETWEEN THE HIGH-BAND AND LOW-BAND SIGNAL PATHS. DURING TRANSMIT AND RECEIVE OPERATION, LOW-BAND AND HIGH-BAND ELELCTROMAGNETIC ENERGY DIRECTED THROUGH THE ANTENNA IS PASSED BY THE LOW-BAND AND HIGH-BAND ISOLATOR NETWORKS, RESPECTIVELY. ALSO INCLUDED ARE LOW-BAND AND HIGH-BAND MATCHING NETWORKS WHICH COUPLE THE LOW-BAND AND HIGH-BAND ISOLATOR NETWORKS TO LOW-BAND AND HIGH-BAND TRANSCEIVER CIRCUITRY.

公开(公告)号：RU2196384C2

公开(公告)日：2003-01-10

申请号：RU97111882

申请日：1995-12-11

Applicant: QUALCOMM INC

Inventor： WHEATLEY CHARLES E III ,  PETERZELL PAUL E ,  KORNFELD RICHARD K ,  WEILAND ANA L

IPC: H04B1/06 ,  H03G1/00 ,  H03G3/30 ,  H04B20060101 ,  H04B1/10 ,  H04B1/16 ,  H04B1/18 ,  H04B1/40 ,  H04B1/7075 ,  H04B1/7097 ,  H04B3/06 ,  H04B7/005 ,  H04B7/26 ,  H04B15/00

Abstract: FIELD: radio communications. SUBSTANCE: power level of received signal is determined in all design alternates and if this level is equal to or higher than predetermined threshold value, received- signal amplifier gain is controlled in radio receiver. Amplifier gain is controlled either by shorting out the amplifier or by continuously controlling its gain. Continuous gain control enables noise suppression and matching of radio receiver sensitivity at lower levels of signal than those in shorted-out amplifier. EFFECT: enhanced noise immunity. 10 cl, 15 dwg

公开(公告)号：AU697823B2

公开(公告)日：1998-10-15

申请号：AU5091096

申请日：1996-03-01

Applicant: QUALCOMM INC

Inventor： MARTIN CHRISTOPHER B ,  KORNFELD RICHARD K ,  GREGORY SHERMAN

IPC: H04B1/06 ,  H04B1/38 ,  H04B7/00 ,  H04B7/005

Abstract: A transceiver system for interfacing digital modems with radio frequency signals including an antenna, an antenna interface system and a modem interface system separated by a cable. The antenna is placed in a location having optimal reception and in close proximity to the antenna interface system. The cable couples the antenna interface system to the modem interface system. The modem interface system includes a two state variable attenuator and an attenuation register that are configured to either reduce the strength of the receive (Rx) signal when the modems are located near a base station, or to transmit the Rx signal without attenuation when the concentrated subscriber unit is at a more distant location. The outgoing, or transmit (Tx), signal is also attenuated in a similar manner to the incoming signal. A signal loss detection system includes a detector located in the modem interface system that receives an oscillating signal transmitted from the antenna interface system through the coaxial cable. A differentiating integrator then determines the amount of signal loss experienced by this oscillating signal during transmission through the coaxial cable and attenuates the signal from the antenna interface system accordingly so the amount of loss experienced remains constant. DC power is transmitted from the modem interface system to the antenna interface system through the coaxial cable. A maximum power limiting system detects when the signal being generated exceeds the capacity of the transmit power amplifier and transmits an alarm signal to the modem interface system.

公开(公告)号：BR9509111A

公开(公告)日：1998-07-14

申请号：BR9509111

申请日：1995-09-27

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K ,  WHEATLEY CHARLES E III

IPC: H04B1/40 ,  H04B1/38 ,  H04B7/005 ,  H04B7/12 ,  H04B7/208 ,  H04B7/26 ,  H04J1/04 ,  H04L1/04 ,  H04L5/06 ,  H04Q11/02 ,  H04W36/14 ,  H04W36/18

Abstract: The dual band code division multiple access radio of the present invention operates on multiple frequencies simultaneously on either transmit or receive. The transmit path operates by splitting the transmit intermediate frequency (IF) path (103) and mixing the IF to two different transmit frequencies using two frequency synthesizers (140 and 145). The receive path (104) has two RF channels (116 and 117) that are mixed with the frequencies generated by the synthesizers (140 and 145) and summed into one IF strip. Thus the radio of the present invention can perform a soft hand-off between frequencies while communicating with both base stations simultaneously. Additional mixing paths and synthesizers can be added if it is desired to communicate with more than two base stations simultaneously.\!

公开(公告)号：HK1001448A1

公开(公告)日：1998-06-19

申请号：HK98100402

申请日：1998-01-16

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K ,  WHEATLEY CHARLES E III

IPC: H04B1/38 ,  H04B1/40 ,  H04B7/005 ,  H04B7/12 ,  H04B7/208 ,  H04B7/26 ,  H04J1/04 ,  H04L1/04 ,  H04L5/06 ,  H04Q11/02 ,  H04W36/14 ,  H04W36/18 ,  H04B

Abstract: The dual band code division multiple access radio of the present invention operates on multiple frequencies simultaneously on either transmit or receive. The transmit path operates by splitting the transmit intermediate frequency (IF) path (103) and mixing the IF to two different transmit frequencies using two frequency synthesizers (140 and 145). The receive path (104) has two RF channels (116 and 117) that are mixed with the frequencies generated by the synthesizers (140 and 145) and summed into one IF strip. Thus the radio of the present invention can perform a soft hand-off between frequencies while communicating with both base stations simultaneously. Additional mixing paths and synthesizers can be added if it is desired to communicate with more than two base stations simultaneously.\!

公开(公告)号：MX9708050A

公开(公告)日：1998-02-28

申请号：MX9708050

申请日：1996-04-22

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K

IPC: H03G3/30 ,  H04B1/036 ,  H04B1/04 ,  H04B1/40 ,  H03G03/20

Abstract: El proceso y el aparato de la presente invencion limitan la potencia de salida de un radio en respuesta a la temperatura de los componentes importantes del radio. Unos sensores de temperatura (1025) miden la temperatura de los componentes y envían las señales de temperatura a la circunferencia de control de potencia (1030). La poetencia de transmision se mide (1020) a la salida de amplificador de potencia (1015). A medida que aumenta la temperatura, la circuitería de control de potencia (1030) reduce la potencia de transmision a fin de reducir la temperatura de los componentes importantes. La potencia de supervisa de manera que no se reduzca por debajo del nivel de potencia requerido por las normas.

公开(公告)号：BR9606630A

公开(公告)日：1998-01-06

申请号：BR9606630

申请日：1996-09-11

Applicant: QUALCOMM INC

Inventor： PITTA THOMAS A ,  PETERZELL PAUL E ,  KORNFELD RICHARD K ,  WEILAND ANA L ,  WALLACE RAYMOND C

IPC: H01P1/213 ,  H03H7/46 ,  H04B1/40

Abstract: A dual-band antenna system for use in a portable communications device is disclosed herein. The antenna system includes an antenna element for radiating electromagnetic energy within low-band and high-band wavelength ranges. In a preferred embodiment, a low-band isolator network, coupled to the antenna element, provides signal isolation between high-band and low-band signal paths during high-band operation. Similarly, a high-band isolator network provides signal isolation, during operation over the low-band range of wavelengths, between the high-band and low-band signal paths. During transmit and receive operation, low-band and high-band electromagnetic energy directed through the antenna is passed by the low-band and high-band isolator networks, respectively. Also included are low-band and high-band matching networks which couple the low-band and high-band isolator networks to low-band and high-band transceiver circuitry.