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    MULTI-FREQUENCY BAND RECEIVER FOR RF SIGNAL
    53.
    发明专利
    MULTI-FREQUENCY BAND RECEIVER FOR RF SIGNAL 未知

    公开(公告)号：MY118134A

    公开(公告)日：2004-09-30

    申请号：MYPI9800145

    申请日：1998-01-14

    Applicant: ERICSSON TELEFON AB L M

    Inventor： MANNERSTRALE JACOB ,  ISBERG MARTIN ,  LINDQUIST BJORN ,  CARLSSON TORSTEN ,  HAGBERG HANS ,  JAKOBSSON PETER ,  KUNKEL LARS ,  GUSTAFSSON KJELL

    IPC: H04B1/18 ,  H03D3/00 ,  H04B1/26 ,  H03D7/16 ,  H04B1/40

    Abstract: THE PRESENT INVENTION RELATES TO A RECEIVER DEVICE COMPRISING A RECEIVER (104) ADAPTED TO RECEIVE RADIO SIGNALS IN TWO FREQUENCY BANDS (FBI, FB2). THE RADIO SIGNALS IN ONE OF THE FREQUENCY BANDS (FB1) CONSTITUTE COMMUNICATION SIGNALS FOR A RADIO SYSTEM (AMPS, NMT) HAVING A CERTAIN CHANNEL SPACING, WHEREAS THE RADIO SIGNALS OF THE SECOND FREQUENCY BAND (FB2) CONSTITUTES COMMUNICATION SIGNALS FOR A SECOND RADIO SYSTEM (PCS1900, DCS1800, GSM) HAVING A SECOND CERTAIN CHANNEL SPACING. THE RECEIVER (104) COMPRISES TWO INPUTS (108, 11) EACH INTENDED FOR A RADIO SYSTEM HAVING DIFFERENT FREQUENCY BANDS AND CHANNEL SPACING. FOR RADIO SIGNALS OCCURRING ON ONE INPUT (108), MIXING IS PERFORMED FROM THE RF RANGE DIRECTLY TO THEBASEBAND FREQUENCY RANGE. FOR RADIO SIGNALS OCCURRING ON THE SECOND INPUT (108) THE MIXING FROM THE RADIO FREQUENCY RANGE TO THE BASEBAND FREQUENCY RANGE IS CARRIED OUT THROUGH AN INTERMEDIATE FREQUENCY RANGE. FURTHER THE RECEIVER (104) COMPRISES AN OUTPUT (112) INTENDED TO DELIVER BASEBAND SIGNALS FOR BOTH RADIO SYSTEMS. THE OUTPUT (112) IS CONNECTED TO A BASEBAND UNIT WHICH IS COMMON TO THE RADIO SYSTEMS. IN THE BASEBAND UNIT, AMONG OTHER THINGS, LOWPASS FILTERING, DETECTION AND NEIGHBOURING CHANNEL SUPPRESSION ARE PERFORMED ON THE RECEIVED RADIO SIGNAL THAT HAS BEEN MIXED DOWN TO THE BASEBAND FREQUENCY RANGE. (FIGURE 2)

    54.
    发明专利
    未知

    公开(公告)号：DE69916499D1

    公开(公告)日：2004-05-19

    申请号：DE69916499

    申请日：1999-11-17

    Applicant: ERICSSON TELEFON AB L M

    Inventor： GUSTAFSSON KJELL ,  DENT PAUL ,  ERIKSSON HAKAN

    IPC: H03M1/18 ,  H03G1/00 ,  H03G3/20 ,  H04B1/16

    Abstract: A receiver having a digital automatic gain control (AGC) circuit is disclosed for use in a cellular communication system, including a Hierarchical Cellular System. The receiver includes a controller which switches between gain control values depending on system operational mode. In this way, the AGC can be optimized for different types of receive processing operations, e.g., traffic reception and measurement of other channels.

    56.
    发明专利
    未知

    公开(公告)号：DE69906349D1

    公开(公告)日：2003-04-30

    申请号：DE69906349

    申请日：1999-11-03

    Applicant: ERICSSON TELEFON AB L M

    Inventor： ATARIUS ROOZBEH ,  ERIKSSON HAKAN ,  PALENIUS TORGNY ,  CARLSSON TORSTEN ,  OESTBERG CHRISTER ,  GUSTAFSSON KJELL

    IPC: H04B1/7115 ,  H04B7/26 ,  H04B1/707 ,  H04B17/00

    Abstract: The present invention provides a system and method for reducing the power consumed by a RAKE receiver. In exemplary embodiments of the present invention, an environment variation estimator is implemented in a CDMA mobile station. The environment variation estimator is connected to the searcher of the RAKE receiver and provides an estimate of the rate at which the mobile station's environment is changing. By providing an estimate of the rate of change of the mobile station's environment, the duty cycle of the searcher can be optimized, thereby reducing the overall power consumed by the receiver. By also providing the estimate to the RAKE fingers, channel tracking can be improved.

    Method and apparatus for configuring a rake receiver
    58.
    发明专利
    Method and apparatus for configuring a rake receiver 未知

    公开(公告)号：AU2014100A

    公开(公告)日：2000-06-26

    申请号：AU2014100

    申请日：1999-11-26

    Applicant: ERICSSON TELEFON AB L M

    Inventor： ATARIUS ROOZBEH ,  ERIKSSON HAKAN ,  PALENIUS TORGNY ,  CARLSSON TORSTEN ,  GUSTAFSSON KJELL ,  OSTBERG CHRISTER

    IPC: H04B1/7093 ,  H04B1/7115 ,  H04B7/08 ,  H04B1/707

    Abstract: A searcher uses an input signal, and for example, a matched filter to generate a first set of candidate paths. A selector uses the input signal and the first set of candidate paths to generate a second set of paths. The second set of paths is used to configure the fingers of a RAKE receiver. According to one aspect of the invention, the first set of candidate paths contains M paths, and the second stage uses M correlators to generate a set of M correlation values. The second stage uses the M correlation values to select N paths that are used to configure the N fingers of the RAKE receiver. According to another aspect of the invention, the first set of candidate paths contains M paths, and the second stage uses a multiple of M correlators to track the M paths and generate a set of M estimates. The second stage uses the M estimates to select N paths that are used to configure the N fingers of the RAKE receiver. According to another aspect of the invention, the selector can generate new sets of N paths while the searcher is either active or inactive. The receiver can use a quality signal or a counter to notify the searcher and/or the selector to generate new sets of paths. The selector decreases the need to continuously run the matched filter. The receiver can re-configure the fingers without having to search for new paths. The receiver can also find paths that are uncorrelated and less susceptible to fading.

    Motion estimator for a cdma mobile station
    59.
    发明专利
    Motion estimator for a cdma mobile station 未知

    公开(公告)号：AU1433600A

    公开(公告)日：2000-05-29

    申请号：AU1433600

    申请日：1999-11-03

    Applicant: ERICSSON TELEFON AB L M

    Inventor： ATARIUS ROOZBEH ,  ERIKSSON HIKAN ,  PALENIUS TORGNY ,  CARLSSON TORSTEN ,  OSTBERG CHRISTER ,  GUSTAFSSON KJELL

    IPC: H04B1/7115 ,  H04B7/26 ,  H04B1/707 ,  H04B17/00

    Abstract: The present invention provides a system and method for reducing the power consumed by a RAKE receiver. In exemplary embodiments of the present invention, an environment variation estimator is implemented in a CDMA mobile station. The environment variation estimator is connected to the searcher of the RAKE receiver and provides an estimate of the rate at which the mobile station's environment is changing. By providing an estimate of the rate of change of the mobile station's environment, the duty cycle of the searcher can be optimized, thereby reducing the overall power consumed by the receiver. By also providing the estimate to the RAKE fingers, channel tracking can be improved.

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