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    ITERATIVE CHANNEL AND INTERFERENCE ESTIMATION AND DECODING
    62.
    发明公开
    ITERATIVE CHANNEL AND INTERFERENCE ESTIMATION AND DECODING 有权
    迭代信道和干扰估计以及解码

    公开(公告)号：EP1726137A1

    公开(公告)日：2006-11-29

    申请号：EP05714030.3

    申请日：2005-02-25

    申请人： Qualcomm, Incorporated

    发明人： KHANDEKAR, Aamod ,  AGRAWAL, Avneesh ,  LING, Fuyun

    IPC分类号： H04L25/03 ,  H04L1/00

    CPC分类号： H04L1/005 ,  H04L1/0071 ,  H04L25/0238 ,  H04L25/03171

    摘要： For an iterative channel and interference estimation and decoding scheme, prior information for channel gain and interference is initially obtained based on received pilot symbols. Forward information for code bits corresponding to received data symbols is derived based on the received data symbols and the prior information and then decoded to obtain feedback information for the code bits corresponding to the received data symbols. A posteriori information for channel gain and interference for each received data symbol is derived based on the feedback information for that received data symbol. The a posteriori information for the received data symbols and the prior information are combined to obtain updated information for channel gain and interference for each received data symbol. The process can be repeated for any number of iterations. The prior, a posteriori, and updated information may be represented by joint probability distributions on channel gain and interference. The forward and feedback information may be represented by log-likelihood ratios.

    DEMULTIPLEXER FOR CHANNEL INTERLEAVING
    64.
    发明公开
    DEMULTIPLEXER FOR CHANNEL INTERLEAVING 审中-公开
    解复用器ZUR KANALVERSCHACHTELUNG

    公开(公告)号：EP1135871A1

    公开(公告)日：2001-09-26

    申请号：EP99968109.1

    申请日：1999-12-09

    申请人： QUALCOMM Incorporated

    发明人： LING, Fuyun ,  ODENWALDER, Joseph, P.

    IPC分类号： H04B7/06 ,  H04L1/06 ,  H04L27/26

    CPC分类号： H04L1/0071 ,  H04B7/0604 ,  H04L1/06 ,  H04L1/08 ,  H04L5/0023 ,  H04L5/0042 ,  H04L5/0044 ,  H04L5/0083 ,  H04L27/2602

    摘要： A demultiplexer (402) for channel interleaving in communications systems with multiple carriers and/or transmitter diversity includes a distribution module (700) that distributes data bits in succession to successive transmitter antennas, and a switching module coupled to the distribution module. The distribution module (700) routes one data bit to each antenna such that no data bit is routed to the same antenna as the previous data bit. The switching module controls the distribution module (700) to skip an antenna in the routing process once each time a predefined number of data bits has been routed. Alternatively, the switching module may control the distribution module to repeat an antenna in the routing process once each time a predefined number of data bits has been routed. The transmitter antennas may, in the alternative, be different carrier frequency bands.

    SYNCHRONIZATION IN A BROADCAST OFDM SYSTEM USING TIME DIVISION MULTIPLEXED PILOTS
    67.
    发明公开
    SYNCHRONIZATION IN A BROADCAST OFDM SYSTEM USING TIME DIVISION MULTIPLEXED PILOTS 审中-公开
    利用时分复用导频在广播OFDM系统中同步

    公开(公告)号：EP2210384A2

    公开(公告)日：2010-07-28

    申请号：EP08844481.5

    申请日：2008-10-31

    申请人： QUALCOMM Incorporated

    发明人： LING, Fuyun ,  GUPTA, Alok Kumar ,  KRISHNAMOORTHI, Raghuraman ,  CHARI, Murali Ramaswamy ,  VIJAYAN, Rajiv ,  VRCELJ, Bojan

    IPC分类号： H04L27/26

    CPC分类号： H04L27/2675 ,  H04L5/0007 ,  H04L5/0051 ,  H04L5/0064 ,  H04L7/042 ,  H04L25/0212 ,  H04L25/0216 ,  H04L25/0224 ,  H04L25/0226 ,  H04L27/2613 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2662

    摘要： In an OFDM system, a transmitter broadcasts a first TDM pilot on a first set of subbands followed by a second TDM pilot on a second set of subbands in each frame. The subbands in each set are selected from among N total subbands such that (1) an OFDM symbol for the first TDM pilot contains at least S1 identical pilot-1 sequences of length L1 and (2) an OFDM symbol for the second TDM pilot contains at least S2 identical pilot-2 sequences of length L2, where L2 > L1, S1 • L1 = N, and S2 • L2 = N. The transmitter may also broadcast an FDM pilot. A receiver processes the first TDM pilot to obtain frame timing (e.g., by performing correlation between different pilot-1 sequences) and further processes the second TDM pilot to obtain symbol timing (e.g., by detecting for the start of a channel impulse response estimate derived from the second TDM pilot).

    摘要翻译： 在OFDM系统中，发射机在第一组子带上广播第一TDM导频，然后在每帧中的第二组子带上广播第二TDM导频。 （1）用于第一TDM导频的OFDM符号包含至少S1个相同的长度为L1的导频-1序列，以及（2）用于第二TDM导频的OFDM符号包含 至少具有长度为L2的S2个相同的导频-2序列，其中L2> L1，S1·L1 = N，并且S2·L2 = N。发射机还可以广播FDM导频。 接收机处理第一TDM导频以获得帧定时（例如，通过执行不同导频-1序列之间的相关）并进一步处理第二TDM导频以获得符号定时（例如，通过检测导出的信道脉冲响应估计的开始 来自第二个TDM试点）。

    APPARATUS AND METHOD FOR DETERMINING SLEEP CLOCK TIMING
    68.
    发明授权
    APPARATUS AND METHOD FOR DETERMINING SLEEP CLOCK TIMING 有权
    装置和方法用于确定睡眠冲程正

    公开(公告)号：EP1869780B1

    公开(公告)日：2010-04-21

    申请号：EP06737617.8

    申请日：2006-03-08

    申请人： QUALCOMM INCORPORATED

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

    IPC分类号： H04B1/16

    CPC分类号： H04W52/029 ,  Y02D70/00

    摘要： Apparatus and methods for estimating the frequency of a sleep or slow clock by selectively utilizing an estimated sleep clock frequency and an estimated change in the sleep clock frequency. The disclosed apparatus includes a sleep clock frequency estimator to output a fast clock derived sleep clock frequency estimate and a sleep clock change frequency estimator to output an estimate of a change in frequency of the sleep clock. The apparatus further includes a combiner that weights at least one of the fast clock derived sleep clock frequency estimate to obtain a weighted sleep clock frequency estimate and the estimate of the change in frequency of the sleep clock to obtain a weighted estimate of the change in frequency of the sleep clock. The combiner also determines a new estimate of the sleep clock frequency using at least one of the weighted sleep clock frequency estimate and the weighted estimate of the change in frequency of the sleep clock. Complementary methods are also disclosed.

    METHODS AND APPARATUS FOR SIGNAL AND INTERFERENCE ENERGY ESTIMATION IN A COMMUNICATION SYSTEM
    70.
    发明公开
    METHODS AND APPARATUS FOR SIGNAL AND INTERFERENCE ENERGY ESTIMATION IN A COMMUNICATION SYSTEM 审中-公开
    方法和用于信号和干扰功率估计器件的通信系统

    公开(公告)号：EP2097986A1

    公开(公告)日：2009-09-09

    申请号：EP07854763.5

    申请日：2007-11-26

    申请人： QUALCOMM Incorporated

    发明人： MANTRAVADI, Ashok ,  LING, Fuyun ,  MUKKAVILLI, Krishna Kiran ,  KRISHNAMOORTHI, Raghuraman

    IPC分类号： H04B1/10

    CPC分类号： H04B1/1027

    摘要： Methods and apparatus for signal and interference energy estimation in a communication system. In an aspect, a method includes setting a threshold value, and comparing a channel estimate to the threshold value to determine an interference estimate (Iest). The method also includes averaging the interference estimate (Iest) to determine average channel interference (Ic), and determining interference energy (I) based on the interference estimate (Iest) and the average channel interference (Ic). In another aspect, an apparatus includes threshold logic configured to set a threshold value and compare a channel estimate to the threshold value to determine an interference estimate (Iest). The apparatus includes averaging logic configured to average the interference estimate (Iest) to determine average channel interference (Ic), and summing logic configured to determine interference energy (I) based on the interference estimate (Iest) and average channel interference (Ic).