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    23.
    发明专利
    未知

    公开(公告)号：DE69620744D1

    公开(公告)日：2002-05-23

    申请号：DE69620744

    申请日：1996-01-30

    Applicant: ERICSSON TELEFON AB L M

    Inventor： OESTMAN THOMAS ,  GUSTAFSSON MAGNUS ,  JAERLEHOLM ANDERS

    IPC: H03G3/20 ,  H03G7/00

    Abstract: A device and method are provided for fully realizing the precision gained internally from a conventional digital signal processor by generating a feed forward automatic gain control (AGC) signal. The feed forward AGC bit is indicative of the output of the digital signal processor being multiplied by a gain factor when the output from the digital filter included in the digital signal processor is below a threshold value. When the feed forward AGC signal is received by an inphase and quadrature (I/Q)-to-(logR/ phi ) converter connected to the digital signal processor, a corresponding value is subtracted from the radius component of the signal calculated by the (I/Q)-to-(logR/ phi ) converter. Because conventional digital signal processors have 16 IO bits, the feed forward AGC signal allows an input signal with a dynamic range and precision exceeding 16 bits to be transferred from the digital signal processor without loosing performance. As a result, a digital signal processor with a fewer number of IO bits than is nominally required for the precision and dynamic range of the output signal is implemented.

    28.
    发明专利
    未知

    公开(公告)号：DE69737932T2

    公开(公告)日：2007-12-06

    申请号：DE69737932

    申请日：1997-05-27

    Applicant: ERICSSON TELEFON AB L M

    Inventor： FORSSEN ULF ,  OESTMAN THOMAS ,  BOTTOMLEY GREGORY E

    IPC: H04B7/08 ,  H04L25/08 ,  H01Q3/26 ,  H03M13/23 ,  H04B7/02 ,  H04B7/10 ,  H04B7/26 ,  H04L1/06 ,  H04L25/03 ,  H04W16/28

    Abstract: Recently, interference rejection combining techniques have been proposed which can increase significantly the performance of the uplink in C/I limited environments. Another interesting property of the IRC techniques is that their C/I performance does not degrade as the correlation between the received signals increases. This feature of IRC techniques is exploited in the present invention to allow for a reduced spacing between the antennas. According to another aspect of the present invention, the performance of the downlink is improved using beamforming techniques to "steer" base station transmissions toward a desired mobile station. In this way, the performance of the downlink is improved using beamforming techniques to a degree similar to that at which the uplink has been improved using IRC techniques. This allows the system designer to more fully exploit the variations in system design associated with improving the uplink performance.

    29.
    发明专利
    未知

    公开(公告)号：AT363772T

    公开(公告)日：2007-06-15

    申请号：AT00946706

    申请日：2000-07-04

    Applicant: ERICSSON TELEFON AB L M

    Inventor： UTTERBORN CEYLON ,  OESTMAN THOMAS ,  STOLT TOMAS

    IPC: H04B7/005 ,  H01Q1/24 ,  H03F3/60 ,  H04B1/04 ,  H04B7/26

    Abstract: The present invention is related to a terrestrial cellular radio communication network comprising at least a first base station (BS1) in which a common set of multi carrier power amplifiers (409-412) are used to amplify radio signals transmitted by the first base station (BS1) in different cells. The invention enables reductions in the total maximum output power the first base station (BS1) needs to support when downlink power control functions, such as power control or discontinuous transmission, and/or Adaptive Channel Allocation are applied in the cells served by the first base station (BS1).

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