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87 条记录 (耗时 0.024 秒)

    FFT collection window positioning using OFDM symbol time tracking information
    52.
    发明授权
    FFT collection window positioning using OFDM symbol time tracking information 有权
    使用OFDM符号时间跟踪信息收集FFT窗口位置

    公开(公告)号：EP1869857B1

    公开(公告)日：2010-03-03

    申请号：EP06737928.9

    申请日：2006-03-09

    申请人： QUALCOMM Incorporated

    发明人： VRCELJ, Bojan ,  MANTRAVADI, Ashok ,  LING, Fuyun ,  VIJAYAN, Rajiv ,  WANG, Michael, Mao

    IPC分类号： H04L27/26

    CPC分类号： H04L27/2662 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0216 ,  H04L25/022 ,  H04L25/0228 ,  H04L27/261 ,  H04L27/265 ,  H04L27/2665 ,  H04L27/2679

    摘要： A method for positioninga collection window for a Fourier transform function is disclosed. A first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol are received. The first OFDM symbol comprises a plurality of frequency division multiplexed (FDM) symbols. The first OFDM symbol is characterized by at least two of the following: a delay spread, a first arriving path (FAP), or a last arriving path (LAP). A channel location is estimated from a channel impulse response. A point relative to the channel location is selected. A beginning of the collection window is positionedfor the second OFDM symbol at the selected point. Alternatively, apoint is selectedat a first location relative to the channel location using a first algorithm if a delay spread is less than a predetermined length. The selected point is chosen at a second location relative to the channel location using a second algorithm if the delay spread is greater than the predetermined length.

    METHODS AND APPARATUS FOR REDUCTION OF A PEAK TO AVERAGE RATIO FOR AN OFDM TRANSMIT SIGNAL
    55.
    发明公开
    METHODS AND APPARATUS FOR REDUCTION OF A PEAK TO AVERAGE RATIO FOR AN OFDM TRANSMIT SIGNAL 审中-公开
    法和设备峰值平均比例对于OFDM传输信号还原

    公开(公告)号：EP2008420A1

    公开(公告)日：2008-12-31

    申请号：EP07760139.1

    申请日：2007-04-04

    申请人： QUALCOMM Incorporated

    发明人： VAN VEEN, Durk L. ,  LING, Fuyun ,  KRISHNAMOORTHI, Raghuraman

    IPC分类号： H04L27/26

    CPC分类号： H04L27/2614 ,  H04L27/2615

    摘要： Methods and apparatus for reduction of a peak to average ratio for an OFDM transmit signal. In an aspect, a method is provided for reducing a peak to average ratio of a transmit waveform. The method includes obtaining a primary scrambler sequence, generating a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining the primary and secondary scrambler sequences to produce a PAR reduction sequence. In another aspect, an apparatus is provided for reducing a peak to average ratio of a transmit waveform. The apparatus includes a secondary generator configured to generate a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining logic configured to combine a primary scrambler sequence and the secondary scrambler sequences to produce a PAR reduction sequence.

    METHODS AND APPARATUS FOR POSITION LOCATION IN A WIRELESS NETWORK
    57.
    发明公开
    METHODS AND APPARATUS FOR POSITION LOCATION IN A WIRELESS NETWORK 有权
    的方法和装置的位置定位的无线网络中

    公开(公告)号：EP1977625A2

    公开(公告)日：2008-10-08

    申请号：EP07777506.2

    申请日：2007-01-04

    申请人： QUALCOMM Incorporated

    发明人： MUKKAVILLI, Krishna Kiran ,  LING, Fuyun ,  WALKER, Gordon Kent ,  CHARI, Murali Ramaswamy

    IPC分类号： H04Q7/38 ,  H04L27/26 ,  G01S5/02

    CPC分类号： G01S5/0205 ,  H04L5/0053 ,  H04W24/00 ,  H04W64/00

    摘要： Methods and apparatus for position location in a wireless network. In an aspect, a method is provided that includes determining whether a symbol (234) to be transmitted is an active symbol, wherein the symbol comprises a plurality of subcarriers, and encoding identification information on a first portion of subcarriers if it is determined that the symbol is the active symbol (236). The method also includes encoding idle information on a second portion of subcarriers if it is determined that the symbol in not the active symbol. In an aspect, an apparatus includes detector logic configured to decode a plurality of symbols to determine identification information that identifies a plurality of transmitters, and to determine a plurality of channel estimate associated with the plurality of transmitters. The apparatus also includes position determination logic configured to calculate a device position based on the plurality of transmitters and the plurality of channel estimates.