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    22.
    发明专利
    未知

    公开(公告)号：AT264570T

    公开(公告)日：2004-04-15

    申请号：AT99972799

    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.

    23.
    发明专利
    未知

    公开(公告)号：DE69915342D1

    公开(公告)日：2004-04-08

    申请号：DE69915342

    申请日：1999-11-26

    Applicant: ERICSSON TELEFON AB L M

    Inventor： ATARIUS ROOZBEH ,  ERIKSSON H KAN ,  PALENIUS TORGNY ,  CARLSSON TORSTEN ,  GUSTAFSSON KJELL ,  OESTBERG 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.

    25.
    发明专利
    未知

    公开(公告)号：BR9814221A

    公开(公告)日：2000-10-03

    申请号：BR9814221

    申请日：1998-11-17

    Applicant: ERICSSON TELEFON AB L M

    Inventor： GUSTAFSSON KJELL ,  ATARIUS ROOZBEH

    IPC: H03K23/66 ,  H04B1/40

    Abstract: A circuit is disclosed for sampling analog signals at a rate which is a rational, non-integer fraction of a clock frequency. The analog signal is sampled at non-equidistant sampling points, with the distances between successive points forming a jitter sequence. The jitter sequence is pre-calculated and stored in a memory within the circuit, reducing processing requirements in use.

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