中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

15 records (took 0.02 seconds)

    FREQUENCY OFFSET ESTIMATING DEVICE FOR OFDM COMMUNICATION SYSTEM
    1.
    发明专利
    FREQUENCY OFFSET ESTIMATING DEVICE FOR OFDM COMMUNICATION SYSTEM 失效

    公开(公告)号：JP2000244448A

    公开(公告)日：2000-09-08

    申请号：JP2000035081

    申请日：2000-02-14

    Applicant: MOTOROLA INC

    Inventor： DE COURVILLE MARC ,  SIMOENS SEBASTIEN ,  BUZENAC SETTINERI VERONIQUE

    IPC: H04J11/00 ,  H04L7/00 ,  H04L27/26

    Abstract: PROBLEM TO BE SOLVED: To provide a device by which carrier/clock frequency offsets can jointly and blindly be estimated on a channel by estimating items related to the carrier frequency offset and the sampling frequency offset by means of a specified joint maximum likelihood estimate. SOLUTION: This device is provided with a local oscillator, a demodulator, a first modulator, a second module and a third module. The first modulator removes the parasitic effect of a channel on a symbol R(k) and generates at least one block Y(k) of a component Ym(k). The second module removes a modulation effect from Y(k), generates at least a modulation effect from Y(k), generates at least one block Z(k) of a component Zm(k) and calculates V of a component Vm. It is set to be Vm=/Ym/. The third module estimates an item A and an item B, which are related to a carrier frequency offset /fc-fb/ and the sampling frequency offset /ft-fr/ by performing a joint maximum likelihood estimate by an expression.

    A OFDM COMMUNICATION AND A METHOD OF TRANSMITTING DATA THEREFOR
    4.
    发明申请
    A OFDM COMMUNICATION AND A METHOD OF TRANSMITTING DATA THEREFOR 审中-公开
    OFDM通信及其发送数据的方法

    公开(公告)号：WO2006076080A3

    公开(公告)日：2006-11-16

    申请号：PCT/US2005041972

    申请日：2005-11-18

    Applicant: MOTOROLA INC ,  MUCK MARKUS ,  DE COURVILLE MARC ,  ROUQUETTE-LEVEIL STEPHANIE

    Inventor： MUCK MARKUS ,  DE COURVILLE MARC ,  ROUQUETTE-LEVEIL STEPHANIE

    IPC: H04J11/00 ,  H04J1/00 ,  H04L27/04 ,  H04L27/28

    CPC classification number: H04L27/261 ,  H04L27/262

    Abstract: An orthogonal Frequency Division Multiplex (OFDM) transmitter (100 in Fig. 1) comprises a symbol generator (103) for generating a first OFDM symbol comprising user data and pilot data. The pilot data comprises a set of predetermined non-orthogonal pilot symbols. A weight generator (109) uses an ampliture estimator (107) for selecting a set of weights for the pilot data in response to a time domain amplitude variation characteristic of the first OFDM symbol. The peak to average power ratio may be determined. The set of weights are selected from a discrete alphabet of weights. A weight processor (113) determineds a second OFDM symbol by weightitng the pilo symbols by the set of weights. The second OFDM symbol is transmitted to a receiver without transmitting identification of the selected set of weights. The receiver may perform a blind detection of the applied weights and may compensate the received pilot symbols for the estimated weight.

    Abstract translation: 正交频分复用（OFDM）发射机（图1中的100）包括用于生成包括用户数据和导频数据的第一OFDM符号的符号发生器（103）。 导频数据包括一组预定的非正交导频符号。 权重发生器（109）使用放大估计器（107）来响应于第一OFDM符号的时域幅度变化特性来选择导频数据的一组权重。 可以确定峰均功率比。 权重集是从离散的权重字母表中选出的。 权重处理器（113）通过将该匹配符号加权一组权重来确定第二OFDM符号。 第二OFDM符号被发送到接收机，而不发送所选择的一组权重的标识。 接收机可以执行所施加的权重的盲检测，并且可以针对所估计的权重补偿接收到的导频符号。

    A TRANSMITTER AND A RECEIVER FOR COMMUNICATING A SIGNAL FROM MULTIPLE ANTENNAS USING A PREAMBLE
    5.
    发明申请
    A TRANSMITTER AND A RECEIVER FOR COMMUNICATING A SIGNAL FROM MULTIPLE ANTENNAS USING A PREAMBLE 审中-公开
    使用前导码从多个天线传输信号的发射机和接收机

    公开(公告)号：WO2006052774A9

    公开(公告)日：2006-09-14

    申请号：PCT/US2005040076

    申请日：2005-11-04

    Applicant: MOTOROLA INC ,  MUCK MARKUS ,  ROUQUETTE-LEVEIL STEPHANIE ,  DE COURVILLE MARC

    Inventor： MUCK MARKUS ,  ROUQUETTE-LEVEIL STEPHANIE ,  DE COURVILLE MARC

    IPC: H04B1/02

    CPC classification number: H04L27/2613 ,  H04J13/18 ,  H04L1/0618

    Abstract: A transmitter comprises a transmit processor (105), preamble inserters (107, 109) and transmit units (113, 117) which are operable to transmit sub-signals from the antennas (115, 119). A preamble set comprising an individual preamble for each antenna generated by a preamble generator (111). Each of the individual preambles comprise first and second sections. The first section comprises a first data sequence, different for each antenna, and is selected from a predetermined set of preamble sequences. The first data sequence may comprise only time domain symbols belonging to the alphabet [1,-1, i,-i,0]. The second section comprises repetitions of a predetermined second data sequence where each repetition is weighted by a coefficient that is different for each antenna. Weighting may be by coefficients of different rows of a Walsh Hadamard matrix. The second data sequence may comprise only frequency domain symbols belonging to the alphabet of [1,-1,0].

    Abstract translation: 发射机包括发射处理器（105），可操作以从天线（115,119）发射子信号的前导码插入器（107,109）和发射单元（113,117）。 前导码集合包括由前导码生成器（111）生成的每个天线的单独前导码。 每个单独的前导码包括第一和第二部分。 第一部分包括对于每个天线不同的第一数据序列，并且从预定的一组前导码序列中选择。 第一数据序列可以仅包括属于字母表[1，-1，i，-i，0]的时域符号。 第二部分包括预定的第二数据序列的重复，其中每个重复由每个天线不同的系数加权。 加权可以是Walsh Hadamard矩阵的不同行的系数。 第二数据序列可以仅包括属于[1，-1,0]的字母表的频域符号。

    10.
    发明专利
    未知

    公开(公告)号：DE69942222D1

    公开(公告)日：2010-05-20

    申请号：DE69942222

    申请日：1999-02-11

    Applicant: MOTOROLA INC

    Inventor： DE COURVILLE MARC ,  SIMOENS SEBASTIEN ,  BUZENAC SETTINERI VERONIQUE

    IPC: H04J11/00 ,  H04L27/26 ,  H04L7/00

    Abstract: Apparatus for estimating carrier and clock frequency offsets in OFDM systems employs a maximun likelihood estimator operation on the demodulated signals. The invention has the benefit of low complexity and obviates the need for any requirement for a dedicated training channel.

Patent Agency Ranking