中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

56 records (took 0.081 seconds)

    31.
    发明专利
    未知

    公开(公告)号：BR9713622A

    公开(公告)日：2000-04-11

    申请号：BR9713622

    申请日：1997-12-19

    Applicant: ERICSSON TELEFON AB L M

    Inventor： HAARTSEN JACOBUS ,  DENT PAUL

    IPC: H04W52/02 ,  H04Q7/00

    Abstract: Establishing a connection between a paging unit and a standby unit in a channel hopping communications system includes activating the standby unit for an activation time period out of every standby time period. During each activation time period, the standby unit monitors a selected channel for receipt of a paging message. The selected channel is selected from a plurality of channels, and, for each subsequent activation time period, the selected channel is a subsequent one of the plurality of channels as specified by a hopping sequence and an internal clock. A page train is repeatedly transmitted from the paging unit to the standby unit, until a response is received from the standby unit. Each page train includes a plurality of paging messages, each paging message being transmitted on a different one of a subset of the plurality of channels. Selection of a page train for transmission by the paging unit may be based on an estimate of the standby unit's internal clock.

    33.
    发明专利
    未知

    公开(公告)号：BRPI0720837A2

    公开(公告)日：2014-03-04

    申请号：BRPI0720837

    申请日：2007-11-27

    Applicant: ERICSSON TELEFON AB L M

    Inventor： DENT PAUL

    IPC: H03M1/66

    Abstract: A fast, high resolution digital-to-analog converter (DAC) is described herein. The DAC comprises a pulse generator, decay circuit, controller, and sample circuit. The pulse generator serially outputs pulses representing digits of a digital word least significant digit first. Each pulse generates a response in the decay circuit that decays over time according to a known decay response. One exemplary decay circuit comprises an RC circuit having an exponential decay response. The controller controls the timing of the pulses output by the pulse generator such that the period of each pulse relates to a predetermined decay amount. The sample circuit samples an output of the decay circuit at a sample time after the decay circuit receives the pulse for the most significant digit. The sampled output represents the analog value corresponding to the input digital word. The digital word may have any length, radix, or format.

    34.
    发明专利
    未知

    公开(公告)号：DE69734009D1

    公开(公告)日：2005-09-22

    申请号：DE69734009

    申请日：1997-12-19

    Applicant: ERICSSON TELEFON AB L M

    Inventor： HAARTSEN JACOBUS ,  DENT PAUL

    IPC: H04W52/02 ,  H04B7/26 ,  H04B1/713

    Abstract: Establishing a connection between a paging unit and a standby unit in a channel hopping communications system includes activating the standby unit for an activation time period out of every standby time period. During each activation time period, the standby unit monitors a selected channel for receipt of a paging message. The selected channel is selected from a plurality of channels, and, for each subsequent activation time period, the selected channel is a subsequent one of the plurality of channels as specified by a hopping sequence and an internal clock. A page train is repeatedly transmitted from the paging unit to the standby unit, until a response is received from the standby unit. Each page train includes a plurality of paging messages, each paging message being transmitted on a different one of a subset of the plurality of channels. Selection of a page train for transmission by the paging unit may be based on an estimate of the standby unit's internal clock.

    Method and apparatus for automatic frequency control in a cdma receiver
    36.
    发明专利
    Method and apparatus for automatic frequency control in a cdma receiver 未知

    公开(公告)号：AU9386201A

    公开(公告)日：2002-04-15

    申请号：AU9386201

    申请日：2001-10-04

    Applicant: ERICSSON TELEFON AB L M

    Inventor： DENT PAUL ,  BOTTOMLEY GREGORY ,  ATARIUS ROOZBEH

    IPC: H04B1/7087 ,  H04B1/712 ,  H04L27/00

    Abstract: Code division multiple access signals received through at least one multipath propagation channel are processed to produce at least one relative frequency error estimate. This involves receiving and processing the signals using a local frequency reference oscillator to obtain representative complex numerical samples for processing. The complex numerical samples are correlated with shifts of a locally generated despreading code and a number of complex channel estimates are produced, each corresponding to a different delayed ray of the at least one multipath propagation channel. A frequency error estimate is computed for each ray based on successive values of a respective one of the channel estimates, and a weighted summation of the frequency error estimates is performed to provide at least one relative frequency error estimate.

    38.
    发明专利
    未知

    公开(公告)号：AT433228T

    公开(公告)日：2009-06-15

    申请号：AT01974324

    申请日：2001-10-04

    Applicant: ERICSSON TELEFON AB L M

    Inventor： DENT PAUL ,  BOTTOMLEY GREGORY ,  ATARIUS ROOZBEH

    IPC: H04B1/7087 ,  H04B1/712 ,  H04L27/00

    Abstract: Code division multiple access signals received through at least one multipath propagation channel are processed to produce at least one relative frequency error estimate. This involves receiving and processing the signals using a local frequency reference oscillator to obtain representative complex numerical samples for processing. The complex numerical samples are correlated with shifts of a locally generated despreading code and a number of complex channel estimates are produced, each corresponding to a different delayed ray of the at least one multipath propagation channel. A frequency error estimate is computed for each ray based on successive values of a respective one of the channel estimates, and a weighted summation of the frequency error estimates is performed to provide at least one relative frequency error estimate.

    SAME-FREQUENCY SATELLITE TERRESTRIAL RADIO BROADCAST
    39.
    发明专利
    SAME-FREQUENCY SATELLITE TERRESTRIAL RADIO BROADCAST 未知

    公开(公告)号：CA2688254A1

    公开(公告)日：2008-12-04

    申请号：CA2688254

    申请日：2008-03-14

    Applicant: ERICSSON TELEFON AB L M

    Inventor： DENT PAUL

    IPC: H04B7/185 ,  H04B7/19

    Abstract: A satellite broadcasts radio programs to mobile and fixed receivers at various locations. Ground stations (220, 320, 620, 720, 820, 1120) supplement the satellite broadcasts in areas where the satellite signal may be shadowed. Likewise, the satellite signal supplements the terrestrial transmissions in areas with marginal terrestrial signal strength. Ground stations (220, 320, 620, 720, 820, 1120) and a satellite (210, 1110) transmit the same digital symbol stream over a same frequency spectrum. The symbol streams arrive in each service area of the ground stations (220, 320, 620, 720, 820. 1120) with a relative delay that is within a window for which a receiver is adapted to decode efficiently. Spectral efficiency is achieved by allowing the ground stations to share the same frequencies as the satellites.

Patent Agency Ranking