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    CONTENT-ADAPTIVE MULTIMEDIA CODING AND PHYSICAL LAYER MODULATION
    34.
    发明公开
    CONTENT-ADAPTIVE MULTIMEDIA CODING AND PHYSICAL LAYER MODULATION 审中-公开
    内容自适应多媒体编码和物理层调制

    公开(公告)号：EP2070235A2

    公开(公告)日：2009-06-17

    申请号：EP07814451.6

    申请日：2007-08-27

    申请人： QUALCOMM Incorporated

    发明人： WALKER, Gordon, Kent ,  LING, Fuyun ,  RAVEENDRAN, Vijayalakshmi, R.

    IPC分类号： H04L1/00

    CPC分类号： H04L1/00 ,  H04N19/12 ,  H04N19/136 ,  H04N19/179

    摘要： This disclosure describes content-adaptive coding and modulation techniques. In particular, this disclosure describes techniques in which both a multimedia coding mode and a physical layer modulation scheme are adaptively selected based on content of a multimedia sequence. When the content changes such that either the coding or the modulation scheme can be improved, the coding and/or modulation may be changed to better optimize to the changed content. In one aspect, this disclosure provides a method of processing multimedia data, the method comprising selecting a multimedia coding mode for an encoder to encode the multimedia data and a physical layer modulation scheme for transmission of the multimedia data based on content of the multimedia data.

    APPARATUS AND METHODS FOR TIMING RECOVERY IN A WIRELESS TRANSCEIVER
    35.
    发明公开
    APPARATUS AND METHODS FOR TIMING RECOVERY IN A WIRELESS TRANSCEIVER 审中-公开
    装置及方法的无线传输/接收装置卒中恢复

    公开(公告)号：EP1958412A2

    公开(公告)日：2008-08-20

    申请号：EP06850961.1

    申请日：2006-12-14

    申请人： Qualcomm, Incorporated

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

    IPC分类号： H04L27/26

    CPC分类号： H04L27/2656 ,  H04L27/261 ,  H04L27/2675

    摘要： Apparatus and methods for use in a wireless communication system are disclosed for recovery of timing tracking in a device, such as a wireless transceiver, after decoding errors occur due to incorrect timing tracking. In particular, the disclosed methods and apparatus recover timing tracking by monitoring a decoded signal in the transceiver for decoding errors occurring during a first frame, determining whether a number of decoding errors is greater than a predetermined amount, reacquiring a first pilot channel at a start of a subsequently received second frame when the number of decoding errors is determined to be greater than the predetermined amount, and resetting timing tracking of the transceiver based on the reacquired first pilot channel.

    METHODS AND APPARATUS FOR DETERMINING TIMING IN A WIRELESS COMMUNICATION SYSTEM
    36.
    发明公开
    METHODS AND APPARATUS FOR DETERMINING TIMING IN A WIRELESS COMMUNICATION SYSTEM 审中-公开
    方法和设备用于确定时序无线通信系统

    公开(公告)号：EP1943799A2

    公开(公告)日：2008-07-16

    申请号：EP06839646.4

    申请日：2006-10-13

    申请人： QUALCOMM Incorporated

    发明人： VRCELJ, Bojan ,  LING, Fuyun ,  WANG, Michael, Mao

    IPC分类号： H04L27/26

    CPC分类号： H04L27/2662 ,  H04L27/2676

    摘要： Methods and apparatus for setting timing of sampling of one or more symbols. The disclosed methods account for at least three types of effective interference (EI) and are used to set the timing of a sampling window for sampling received symbols. The methods includes setting timing based on determining an energy density function accounting for both static and dynamic EI, determining the minimum of a total energy profile and sliding the sampling window to ensure that the minimum point is at a predetermined point, and determining and using a composite energy profile accounting for short term and long term fading effects. The disclosed apparatus include a transceiver employing one or more of the disclosed methods for setting timing when receiving the symbols.

    POSITION LOCATION USING PHASE-ADJUSTED TRANSMITTERS
    37.
    发明公开
    POSITION LOCATION USING PHASE-ADJUSTED TRANSMITTERS 审中-公开
    POSITIONSLOKALISIERUNG UNTER VERWENDUNG PHASENJUSTIERTER SENDER

    公开(公告)号：EP1929830A1

    公开(公告)日：2008-06-11

    申请号：EP06815730.4

    申请日：2006-09-27

    申请人： Qualcomm Incorporated

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

    IPC分类号： H04Q7/38 ,  G01S5/10

    CPC分类号： G01S5/021 ,  G01S1/024 ,  G01S5/0226 ,  G01S5/14 ,  H04W64/00

    摘要： Systems and methods are provided for determining position location information in a wireless network. In one embodiment, timing offset information is communicated between multiple transmitters and one or more receivers. Such information enables accurate position or location determinations to be made that account for timing differences throughout the network. In another embodiment, transmitter phase adjustments are made that advance or delay transmissions from the transmitters to account for potential timing differences at receivers. In yet another embodiment, combinations of timing offset communications and/or transmitter phase adjustments can be employed in the wireless network to facilitate position location determinations.

    摘要翻译： 提供了用于确定无线网络中的位置位置信息的系统和方法。 在一个实施例中，在多个发射机和一个或多个接收机之间传送定时偏移信息。 这样的信息使得可以进行精确的位置或位置确定，从而考虑整个网络的时序差异。 在另一个实施例中，进行发射机相位调整，其推进或延迟来自发射机的传输以考虑接收机处的潜在时序差异。 在另一个实施例中，可以在无线网络中采用定时偏移通信和/或发射机相位调整的组合以便于位置定位确定。

    FFT COLLECTION WINDOW POSITIONING USING OFDM SYMBOL TIME TRACKING INFORMATION
    38.
    发明公开
    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：EP1869857A1

    公开(公告)日：2007-12-26

    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.

    AUTOMATIC FREQUENCY CONTROL FOR A WIRELESS COMMUNICATION SYSTEM WITH MULTIPLE SUBCARRIERS
    39.
    发明公开
    AUTOMATIC FREQUENCY CONTROL FOR A WIRELESS COMMUNICATION SYSTEM WITH MULTIPLE SUBCARRIERS 审中-公开
    自动频率控制与多个子载波无线通信系统

    公开(公告)号：EP1869767A2

    公开(公告)日：2007-12-26

    申请号：EP06738527.8

    申请日：2006-03-13

    申请人： Qualcomm Incorporated

    发明人： MURTHY, Vinay ,  GUPTA, Alok ,  CHUNG, Seong Taek ,  LING, Fuyun

    IPC分类号： H03J7/04

    CPC分类号： G06F1/0353 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2678

    摘要： Techniques for performing frequency control in an OFDM system are described. In one aspect, frequency acquisition is performed based on a received pilot, and frequency tracking is performed based on received OFDM symbols. For frequency acquisition, an initial frequency error estimate may be derived based on the received pilot, and an automatic frequency control (AFC) loop may be initialized with the initial frequency error estimate. For frequency tracking, a frequency error estimate may be derived for each received OFDM symbol, and the AFC loop may be updated with the frequency error estimate. Frequency error in input samples is corrected by the AFC loop with the initial frequency error estimate as well as the frequency error estimate for each received OFDM symbol. In another aspect, a variable number of samples of a received OFDM symbol are selected, e.g., based on the received OFDM symbol timing, for use for frequency error estimation.