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    A METHOD FOR SIGNAL PROCESSING AND A SIGNAL PROCESSOR IN AN OFDM SYSTEM
    4.
    发明公开
    A METHOD FOR SIGNAL PROCESSING AND A SIGNAL PROCESSOR IN AN OFDM SYSTEM 审中-公开
    一种信号处理方法和一种OFDM系统中的信号处理器

    公开(公告)号：EP1757052A1

    公开(公告)日：2007-02-28

    申请号：EP05740463.4

    申请日：2005-05-24

    申请人： Koninklijke Philips Electronics N.V.

    发明人： BAGGEN, Constant, P., M., J. ,  HUSEN, Sri, A. ,  STASSEN, Maurice, L., A. ,  TSANG, Hoi, Y.

    IPC分类号： H04L25/03 ,  H04L27/26 ,  H04L25/02

    CPC分类号： H04L27/2647 ,  H04L25/0234 ,  H04L2025/03414 ,  H04L2025/03522 ,  H04L2025/03605

    摘要： A method of signal processing for a receiver for OFDM encoded digital signals, for counteracting inter-carrier interference (ICI) caused by Doppler broadening. The OFDM encoded digital signals are transmitted as sub-carriers in several channels, which form OFDM blocks. The method comprises estimation of a channel transfer function (H1) by a channel estimation scheme in each sub-carrier and estimation of data (a1) by a data estimation scheme from said channel transfer function (H1) and a received signal (yo). Then, a derivative (Hj’) of said channel transfer function in each sub-carrier is estimated by a temporal filtering; and the inter-carrier interference (ICI) is removed from said received signal by using the estimated data (â1) and the estimated derivative (Hj’ ) of the channel transfer function in order to obtain a cleaned received signal (y1).

    摘要翻译： 一种用于OFDM编码数字信号的接收机的信号处理方法，用于抵消由多普勒展宽引起的载波间干扰（ICI）。 OFDM编码的数字信号作为形成OFDM块的几个信道中的子载波传送。 该方法包括通过每个子载波中的信道估计方案来估计信道传递函数（H1），并且通过来自所述信道传递函数（H1）和接收信号（yo）的数据估计方案来估计数据（a1）。 然后，通过时间滤波来估计每个子载波中的所述信道传递函数的导数（Hj'）; 并且通过使用估计的数据（11）和信道传递函数的估计微分（Hj'）从所述接收信号中去除载波间干扰（ICI），以便获得清洁的接收信号（y1）。

    CHANNEL ESTIMATION IN AN OFDM SYSTEM WITH HIGH DOPPLER SHIFT
    5.
    发明公开
    CHANNEL ESTIMATION IN AN OFDM SYSTEM WITH HIGH DOPPLER SHIFT 审中-公开
    信道估计在极多普勒变换的OFDM系统

    公开(公告)号：EP1754352A1

    公开(公告)日：2007-02-21

    申请号：EP05738582.5

    申请日：2005-05-23

    申请人： Koninklijke Philips Electronics N.V.

    发明人： BAGGEN, Constant, P., M., J. ,  HUSEN, Sri, A. ,  STASSEN, Maurice, L., A. ,  TSANG, Hoi, Y.

    IPC分类号： H04L25/02 ,  H04L27/26

    CPC分类号： H04L25/0232 ,  H04L25/022 ,  H04L25/0256 ,  H04L27/2602 ,  H04L27/2647 ,  H04L2025/03496

    摘要： A method of signal processing and a signal processor for a receiver for OFDM encoded digital signals. The OFDM encoded digital signals are transmitted as data symbol sub-carriers in several frequency channels. A subset of said sub carriers is in the form of pilot sub-carriers having a value known to the receiver. A first estimation of channel coefficients (H0) at said pilot sub-carriers is performed followed by cleaning of the estimated channel coefficients (H0) at the pilot sub-carriers. Then, a second estimation of channels coefficients (H1) is performed at the data symbol sub-carriers. The first estimation is performed by dividing received symbols (yp) at said pilot sub-carriers by the known pilot symbols (ap). the channel frequency response is supposed to vary linearly within one OFDM symbol. Therefore for each symbol and sub-band, a channel frequency response and its derivate are calculated or interpolated.

    A METHOD FOR SIGNAL PROCESSING AND A SIGNAL PROCESSOR IN AN OFDM SYSTEM
    6.
    发明公开
    A METHOD FOR SIGNAL PROCESSING AND A SIGNAL PROCESSOR IN AN OFDM SYSTEM 审中-公开
    一种信号处理方法和一种OFDM系统中的信号处理器

    公开(公告)号：EP1754354A1

    公开(公告)日：2007-02-21

    申请号：EP05739795.2

    申请日：2005-05-24

    申请人： Koninklijke Philips Electronics N.V.

    发明人： BAGGEN, Constant, P., M., J. ,  HUSEN, Sri, A. ,  STASSEN, Maurice, L., A. ,  TSANG, Hoi, Y.

    IPC分类号： H04L25/03 ,  H04L27/26 ,  H04L25/02

    CPC分类号： H04L25/03159 ,  H04L25/0234 ,  H04L25/0236 ,  H04L2025/03414 ,  H04L2025/03605

    摘要： A method of signal processing for a receiver for OFDM encoded digital signals. The OFDM encoded digital signals are transmitted as data symbol sub-carriers in several frequency channels. A subset of the sub-carriers is in the form of pilot sub-carriers having a pilot value (ap) known to the receiver. First, a received signal (yo) is obtained, followed by a first estimation of a pilot channel transfer function (Ho) at pilot sub-carriers from said received signal (yo) and said known pilot values (ap). Then a second estimation of a channel transfer function (H1) is performed at all sub-carriers from said pilot channel transfer function (Ho). A third estimation of a derivative (H'1) of the channel transfer function (H1) is performed from the channel transfer function (H1) and a channel transfer function (H3) from a past OFDM symbol. Finally, a fourth estimation of a cleaned received signal (y1) is performed from said derivative (H'1), said received signal (yo) and said pilot values (ap) by removal of pilot-induced interference.

    摘要翻译： 用于OFDM编码数字信号的接收机的信号处理方法。 OFDM编码的数字信号在数个频道中作为数据符号子载波传输。 子载波的子集采用具有接收机已知的导频值（ap）的导频子载波的形式。 首先，获得接收信号（y 0），然后从所述接收信号（y 0）和所述已知导频值（ap）在导频子载波处对导频信道传递函数（H 0）进行第一估计。 然后，在来自所述导频信道传递函数（Ho）的所有子载波处执行信道传递函数（H1）的第二估计。 根据信道传递函数（H1）和来自过去的OFDM符号的信道传递函数（H3）来执行信道传递函数（H1）的导数（H'1）的第三估计。 最后，通过去除导频感应干扰，从所述导数（H'1），所述接收信号（yo）和所述导频值（ap）执行干净的接收信号（y1）的第四估计。