公开(公告)号：AU1424799A

公开(公告)日：1999-04-01

申请号：AU1424799

申请日：1999-01-29

Applicant: QUALCOMM INC

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

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: An apparatus to increase a radio receiver's immunity to radio frequency interference, the radio receiver receiving a signal, the apparatus comprising: a switch (1105) coupled to the received signal, the switch (1105) having an open position and a closed position; a resistance (1101), a first end of the resistance (1101) being coupled to the closed position of the switch (1105) and a second end of the resistance (1101) being coupled to a ground potential; an amplifier (1101) having an input coupled to the open position of the switch (1105), for generating an amplified received signal at an output; a controller coupled to the switch (1105), for switching the switch (1105) to the closed position in response to the received signal exceeding a predetermined power level, said received signal conducting through said switch (1105) and said resistance (1101) to ground potential when said switch (1105) is in said closed position; and said resistance (1101) creating an impedance mismatch at the input to said amplifier (1110) when said switch (1105) is in closed position, thereby reducing the gain contributed by said amplifier (1110).

公开(公告)号：BR9510050A

公开(公告)日：1998-11-03

申请号：BR9510050

申请日：1995-12-11

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K

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: An apparatus to increase a radio receiver's immunity to radio frequency interference, the radio receiver receiving a signal, the apparatus comprising: a switch (1105) coupled to the received signal, the switch (1105) having an open position and a closed position; a resistance (1101), a first end of the resistance (1101) being coupled to the closed position of the switch (1105) and a second end of the resistance (1101) being coupled to a ground potential; an amplifier (1101) having an input coupled to the open position of the switch (1105), for generating an amplified received signal at an output; a controller coupled to the switch (1105), for switching the switch (1105) to the closed position in response to the received signal exceeding a predetermined power level, said received signal conducting through said switch (1105) and said resistance (1101) to ground potential when said switch (1105) is in said closed position; and said resistance (1101) creating an impedance mismatch at the input to said amplifier (1110) when said switch (1105) is in closed position, thereby reducing the gain contributed by said amplifier (1110).

公开(公告)号：AR001578A1

公开(公告)日：1997-11-26

申请号：AR33610196

申请日：1996-04-09

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K

IPC: H03G3/30 ,  H04B1/036 ,  H04B1/04 ,  H04B1/40 ,  H03L5/02 ,  H04Q7/22 ,  H04M1/19

Abstract: La invención se refiere a un circuito para la corrección de la potencia de salida de transmisiones de enlace abierto de un radio-teléfono y a unradio-teléfono que utiliza dicho circuito. El circuito limita la potencia de salida de una radio en respuesta a los componentes claves de la radio. Lossensores térmicos miden la temperatura de los componentes y envían senales de temperatura al conjunto de circuitos de control de potencia. La potenciatransmitida es medida a la salida del amplificador de potencia. A medida que se incrementa la temperatura, el conjunto de circuitos de control de potenciareduce la potencia de transmisión para reducir la temperatura de los componentes clave. La potencia se verifica de modo tal que la misma no sereduzca por debajo del nivel de potencia requerido por las normas.

公开(公告)号：MX9704445A

公开(公告)日：1997-09-30

申请号：MX9704445

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 ,  H04B07/005

Abstract: El método y aparato de la presente invencion mejora la inmunidad a la interferencia de un radio receptor. El nivel de potencia de una señal recibida se detecta. Si el nivel de potencia cumple o excede un umbral de potencia predeterminado, el amplificador de los componentes receptores. Las modalidades alternativas incluyen el uso de un detector de potencia de RF (105) para controlar la ganancia del extremo frontal (110) como una funcion de potencia emisora interferente. En lugar de un bloque de ganancia de RF conmutable (730), se proponen varios métodos de control de ganancia continuo. El control de ganancia continuo permite la supresion de interferencia y la sensibilidad del receptor para ajustarse a niveles de señal inferiores al bloque de ganancia conmutable. Un método de la presente invencion ajusta la ganancia de entrada en una cantidad predeterminada (1601). El procesamiento de receptor mide el cambio de ganancia en la potencia de señal de IF (1605). Si el cambio es menor a la cantidad predeterminada (1610), la señal de CDMA y los emisores perturbadores se encuentran por debajo del piso de ruido y, por consiguiente, la ganancia se incrementa (1615). Si el cambio de la potencia de señal IF es mayor a la cantidad predeterminada, la interferencia es evidente y la ganancia se reduce para reducir los productos de intermodulacion (1620). Este proceso se utiliza hasta que el receptor opera al mejor compromiso entre interferencia y figura de ruido.

公开(公告)号：AU1469397A

公开(公告)日：1997-07-28

申请号：AU1469397

申请日：1996-12-23

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K

IPC: H04J13/00 ,  H04B7/06 ,  H04B7/08 ,  H04B7/26

Abstract: A diversity antenna system in a mobile unit which provides time, space and antenna pattern diversity to mitigate the effects of fading at a CDMA mobile unit. The system is comprised of a diversity antenna (105) and a main antenna (100). The main antenna (100) and diversity antenna (105) are physically separated and oriented such that they have different antenna gain patterns. In a first embodiment, the diversity antenna (105) functions as a receive antenna only, while the main antenna (100) performs both transmit and receive functions. In a second embodiment, both the main antenna (100) and the diversity antenna (105) transmit and receive signals. A delay circuit (130) couples the diversity antenna (105) to a summer (135) which sums the signals received by the main antenna (100) and the diversity antenna (105), respectively.

公开(公告)号：FI971759A

公开(公告)日：1997-07-08

申请号：FI971759

申请日：1997-04-24

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 ,  H01Q

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.

公开(公告)号：MX9504538A

公开(公告)日：1997-05-31

申请号：MX9504538

申请日：1995-02-17

Applicant: QUALCOMM INC

Inventor： WEILAND ANA L ,  KORNFELD RICHARD K ,  KERR RICHARD J ,  MALONEY JOHN E ,  WILSON NATHANIEL B

IPC: H04B1/40 ,  H04B1/04 ,  H04B7/005 ,  H04B7/26 ,  H04W52/06 ,  H04W52/52 ,  H04B07/005

Abstract: El proceso y aparatos de la presente invencion limitan la salida de potencia de un radioteléfono que opera en un sistema celular en la modalidad preferida. Esto asegura que las bandas laterales transmitidas y el ruido de la fase sintetizadora permanezca dentro de una cierta especificacion. Esto se lleva a cabo mediante la deteccion de potencia y un acumulador de correccion que en conjunto generan una señal de control de ganancia al limitar el ajuste de ganancia a un valor máximo, incluso cuando el sitio celular que se comunica con el radioteléfono envía comandos de ascenso de potencia al radioteléfono. Este proceso incluye corregir de manera dinámica el nivel de salida del transmisor debido a las variaciones de ganancia en las etapas del transmisor o los elementos de control de ganancia.

公开(公告)号：FI971244A0

公开(公告)日：1997-03-25

申请号：FI971244

申请日：1997-03-25

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K ,  WHEATLEY III CHARLES E

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：ZA967264B

公开(公告)日：1997-03-04

申请号：ZA967264

申请日：1996-08-27

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 ,  H01Q ,  H04B

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.

公开(公告)号：ZA961022B

公开(公告)日：1996-08-13

申请号：ZA961022

申请日：1996-02-08

Applicant: QUALCOMM INC

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

IPC: H04B1/06 ,  H04B1/38 ,  H04B7/00 ,  H04B7/005 ,  H04L

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.