公开(公告)号：DE69131230T2

公开(公告)日：1999-12-09

申请号：DE69131230

申请日：1991-10-15

Applicant: QUALCOMM INC

Inventor： WHEATLEY CHARLES

IPC: H03G3/00 ,  H03G1/04 ,  H03G3/10 ,  H03G3/30

Abstract: An amplification circuit having a compensation circuit for receiving a control signal and generating a corresponding compensation signal according to predetermined compensation characteristics. An input amplification circuit is provided for, receiving an input signal and the compensation signal amplifying the input signal at an input gain level determined by the compensation signal and providing a corresponding input amplification circuit output signal. A filter element receives and filters unwanted frequency components from the input amplification circuit output signal. An output amplification circuit is provided for, receiving the filtered input amplification circuit output signal and the compensation signal, amplifying the filtered input amplification circuit output signal at an output gain level determined by the compensation signal and providing a corresponding output amplification circuit output signal.

公开(公告)号：DE69131074T2

公开(公告)日：1999-11-11

申请号：DE69131074

申请日：1991-11-27

Applicant: QUALCOMM INC

Inventor： WHEATLEY CHARLES ,  PUNCH DEREK

IPC: H03G3/30 ,  H03G3/20 ,  H03G7/00

Abstract: A closed loop automatic gain control (AGC) circuit with high dynamic range capabilities having an amplifier circuit for receiving an input signal, which is susceptible to variations in signal power, and a control signal. The amplifier circuit is responsive to the control signal for amplifying the input signal at a gain level corresponding to the control signal so as to provide a corresponding output signal. A measurement circuit is coupled to the amplifier means for measuring logarithmic signal power of the amplified input signal and providing a corresponding linear measurement signal. An integration circuit is included for receiving the measurement signal, and a reference signal which corresponds to a desired signal power of the output signal. The integration circuit integrates with respect to time the difference between the measurement signal and the reference signal, and generates the control signal which corresponds to the result of the integration.

公开(公告)号：DE69032105T2

公开(公告)日：1998-10-08

申请号：DE69032105

申请日：1990-11-05

Applicant: QUALCOMM INC

Inventor： GILHOUSEN KLEIN ,  PADOVANI ROBERTO ,  WHEATLEY CHARLES

IPC: H04B7/005 ,  H04B7/26 ,  H04W52/00 ,  H04W52/02 ,  H04W52/06 ,  H04W52/08 ,  H04W52/10 ,  H04W52/12 ,  H04W52/40 ,  H04W52/52

Abstract: A power control system for a cellular mobile telephone system in which system users communicate information signals between one another via at least one cell site using code division multiple access spread spectrum communication signals. The power control system controls transmission signal power for each cellular mobile telephone in the cellular mobile telephone system wherein each cellular mobile telephone has an antenna, transmitter and receiver and each cell-site also has an antenna, transmitter and receiver. Cell-site transmitted signal power is measured as received at the mobile unit. Transmitter power is adjusted at the mobile unit in an opposite manner with respect to increases and decreases in received signal power. A power control feedback scheme may also be utilized. At the cell-site communicating with the mobile unit, the mobile unit transmitted power is measured as received at the cell-site. A command signal is generated at the cell-site and transmitted to the mobile unit for further adjusting mobile unit transmitter power corresponding to deviations in the cell site received signal power. The feedback scheme is used to further adjust the mobile unit transmitter power so as to arrive at the cell-site at a desired power level.

公开(公告)号：DE69032044T2

公开(公告)日：1998-06-10

申请号：DE69032044

申请日：1990-11-05

Applicant: QUALCOMM INC

Inventor： GILHOUSEN KLEIN ,  PADOVANI ROBERTO ,  WHEATLEY CHARLES

IPC: H04B1/7115 ,  H04B1/712 ,  H04B7/08 ,  H04B7/26 ,  H04L1/06 ,  H04Q7/30 ,  H04L27/30

Abstract: A spread spectrum receiver subsystem for utilization in a CDMA cellular telephone having a searcher receiver for scanning the time domain so as to use the PN processing gain and time discrimination properties of spread spectrum coding to determine the location in the time domain and the received signal strength of multiple receptions of a pilot signal traveling upon one or more physical propagation paths to reception. The searcher receiver provides a control signal indicative of the received pilot signals of greatest strength and corresponding time relationship. A data receiver receives spread spectrum communication signals accompanying each received pilot signal and is responsive to the searcher control signal for acquiring and demodulating a spread spectrum communication signal, concomitant with the pilot signal of greatest signal strength, and thus providing a corresponding information bearing encoded output signal.

公开(公告)号：DE69032105D1

公开(公告)日：1998-04-09

申请号：DE69032105

申请日：1990-11-05

Applicant: QUALCOMM INC

Inventor： GILHOUSEN KLEIN ,  PADOVANI ROBERTO ,  WHEATLEY CHARLES

IPC: H04B7/005 ,  H04B7/26 ,  H04W52/00 ,  H04W52/02 ,  H04W52/06 ,  H04W52/08 ,  H04W52/10 ,  H04W52/12 ,  H04W52/40 ,  H04W52/52

Abstract: A power control system for a cellular mobile telephone system in which system users communicate information signals between one another via at least one cell site using code division multiple access spread spectrum communication signals. The power control system controls transmission signal power for each cellular mobile telephone in the cellular mobile telephone system wherein each cellular mobile telephone has an antenna, transmitter and receiver and each cell-site also has an antenna, transmitter and receiver. Cell-site transmitted signal power is measured as received at the mobile unit. Transmitter power is adjusted at the mobile unit in an opposite manner with respect to increases and decreases in received signal power. A power control feedback scheme may also be utilized. At the cell-site communicating with the mobile unit, the mobile unit transmitted power is measured as received at the cell-site. A command signal is generated at the cell-site and transmitted to the mobile unit for further adjusting mobile unit transmitter power corresponding to deviations in the cell site received signal power. The feedback scheme is used to further adjust the mobile unit transmitter power so as to arrive at the cell-site at a desired power level.

公开(公告)号：DE69401744T2

公开(公告)日：1997-09-04

申请号：DE69401744

申请日：1994-08-24

Applicant: QUALCOMM INC

Inventor： DEAN RICHARD ,  ANTONIO FRANKLIN ,  GILHOUSEN KLEIN ,  WHEATLEY CHARLES

IPC: H04B7/04 ,  H01Q21/29 ,  H04B7/02 ,  H04B7/06 ,  H04B7/08 ,  H04B7/26 ,  H04W36/18 ,  H04W88/08 ,  H04Q7/36

Abstract: A distributed antenna system is utilized in a system for providing multipath signals which facilitate signal diversity for enhanced system performance. Each node of the antenna comprises more than one antenna. Each antenna at a common node provides a path having a different delay to the base station.