中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

197 records (took 0.034 seconds)

    81.
    发明专利
    未知

    公开(公告)号：BR9505648A

    公开(公告)日：2002-06-04

    申请号：BR9505648

    申请日：1995-01-09

    Applicant: MOTOROLA INC

    Inventor： STEWART KENNETH A ,  KOTZIN MICHAEL

    IPC: G10L19/00 ,  H04B1/10 ,  H04B7/26 ,  H04L12/56 ,  H04W16/14 ,  H04W28/22 ,  H04W36/18 ,  H04Q7/30

    Abstract: A code division multiple access (CDMA) communication system reduces interference by reducing the encoding rate for selected mobiles. The system primarily uses link related characteristics such as, inter alia, distance measurements, physical resource power and mobile determined noise, to determine which mobiles require a encoding rate reduction. Once determined, the encoding rate of the determined mobiles is reduced, which in turn reduces self-interference and enhances system capacity.

    83.
    发明专利
    未知

    公开(公告)号：BR9814805A

    公开(公告)日：2000-10-17

    申请号：BR9814805

    申请日：1998-11-13

    Applicant: MOTOROLA INC

    Inventor： STEWART KENNETH A ,  QIAO YI

    IPC: H04K1/02 ,  H04B1/7105 ,  H04B7/08 ,  H04L27/18 ,  H04B15/00 ,  H04K1/00 ,  H04L27/30

    Abstract: Joint detection of data signals occurs in a code division, multiple access (CDMA) communication system as follows: A digital signal processor (315) first extracts a midamble portion of transmitted signal vectors and generates an estimate of the channel response corresponding to each user-antenna pair using a channel estimator (401). In the preferred embodiment, each user's transmission within the communication system comprises either the type-1 or type-2 burst with varying midamble and guard period durations. Next, a convolution processor (402) forms the convolution of the user signature sequence with the channel impulse response estimate associated with each user and each of the antennas (308)-(310). A detector (403) utilizes the set of vectors and creates a set of sub-system matrices and solves the sub-system matrices to extract symbol information from an individual remote unit's transmission. Finally, the detector (403) outputs symbol information for subsequent infrastructure processing.

    84.
    发明专利
    未知

    公开(公告)号：BR9710602A

    公开(公告)日：1999-08-17

    申请号：BR9710602

    申请日：1997-05-21

    Applicant: MOTOROLA INC

    Inventor： SEXTON THOMAS A ,  LING FUYUN ,  STEWART KENNETH A

    IPC: H04L27/01 ,  H04B1/7085 ,  H04L7/00 ,  H04L7/033 ,  H04L7/10 ,  H04L27/22 ,  H04Q7/38 ,  H04B3/04

    Abstract: The method includes acquiring a signal (501); inputting (502), at a first time, a received symbol to a demodulator having a plurality of outputs to produce a set of early outputs; inputting (504), at a second time, the received symbol to the demodulator to produce a set of on-time outputs; inputting (505), at a third time, the received symbol to the demodulator to produce a set of late outputs; and comparing (506) at least one output in the set of early outputs with at least one output in the set of late outputs to produce a timing measure.

    86.
    发明专利
    未知

    公开(公告)号：FI964470A

    公开(公告)日：1996-11-06

    申请号：FI964470

    申请日：1996-11-06

    Applicant: MOTOROLA INC

    Inventor： STEWART KENNETH A

    IPC: H04B1/707 ,  H04B7/24 ,  H04Q7/38 ,  H04B

    Abstract: A method and apparatus is provided for generating a decision value (809) for use in signal acquisition and channel estimation. In a first embodiment a receiver (850) is provided including at least two spatially diverse antennas (600, 601) which can receive different, e.g. consecutive, segments of the same signal, a signal characteristic (e.g., energy) determination stage (840) for processing the different segments to determine the separate energy values for the segments, and an accumulator (808) for accumulating the energy values so as to form the decision value or statistic (809). Additional embodiments are also provided.

    88.
    发明专利
    未知

    公开(公告)号：FI954623A0

    公开(公告)日：1995-09-29

    申请号：FI954623

    申请日：1995-09-29

    Applicant: MOTOROLA INC

    Inventor： KOTZIN MICHAEL D ,  STEWART KENNETH A

    IPC: G10L19/00 ,  H04B1/10 ,  H04B7/26 ,  H04L12/56 ,  H04W16/14 ,  H04W28/22 ,  H04W36/18 ,  H04Q ,  H04B

    Abstract: A code division multiple access (CDMA) communication system reduces interference by reducing the encoding rate for selected mobiles. The system primarily uses link related characteristics such as, inter alia, distance measurements, physical resource power and mobile determined noise, to determine which mobiles require a encoding rate reduction. Once determined, the encoding rate of the determined mobiles is reduced, which in turn reduces self-interference and enhances system capacity.

    89.
    发明专利
    未知

    公开(公告)号：SE9502703D0

    公开(公告)日：1995-07-27

    申请号：SE9502703

    申请日：1995-07-27

    Applicant: MOTOROLA INC

    Inventor： LOVE ROBERT TRISTAN ,  STEWART KENNETH A ,  RAPALA BRYAN

    IPC: H04L27/22 ,  H04B1/707 ,  H04L27/227

    Abstract: The present invention provides a downconverter method and apparatus for downconverting a multiphase modulated signal. The downconverter can be implemented in a multi-phase receiver such as a quadrature receiver. An analog-to-digital converter (103) converts an intermediate frequency signal to a digital signal at a sampling rate. A Hilbert transformation filter (104) and a delay element (105) connected in parallel provide respective passband quadrature and in-phase components of the digital signal. A digital translator (107) alters the passband quadrature and in-phase components based on a predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal. The digital translator (107) can be a pseudorandom sequence demodulator for demodulating a code division multiple access (CDMA) signal. Various types of DC estimation can also be provided in addition to automatic gain control.

Patent Agency Ranking