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    • 4. 发明申请
    • Trellis-based receiver
    • 网格接收器
    • US20060090121A1
    • 2006-04-27
    • US10532930
    • 2003-09-22
    • Andries HekstraConstant Baggen
    • Andries HekstraConstant Baggen
    • H03M7/00H03M13/03
    • H03M13/4161H03M13/39H03M13/3955
    • Receivers (1) for receiving encoded block signals and comprising processor systems (2) decode block signals by using Viterbi algorithms for finding a first candidate/path in a trellis (18) and by generating cost signals for finding further candidates/paths in said trellis (18). To reduce storage capacity, cost signals are combined for series of branches and cumulated cost is compared with thresholds. While searching for said further paths, a search for a further path is made in view of cumulated cost exceeding a threshold or not. The insight of indirectly constructing a list of candidates and the basic idea of more directly constructing said list brings more control. These receivers are less complex, and are further improved by introducing increasing thresholds per trellis and successive combining and different trellis directions for generating and cumulating cost signals and combining in a lexicographical order, and using a check sum for list reduction and by making error detections.
    • 用于接收编码块信号并且包括处理器系统(2)的接收器(1)通过使用维特比算法来解码块信号,用于在网格(18)中找到第一候选/路径,并且通过生成用于在所述网格中找到更多候选/路径的成本信号 (18)。 为了减少存储容量,将成本信号组合用于一系列分支,并将累积成本与阈值进行比较。 在搜索所述另外的路径时,考虑到累积成本超过阈值而进行另一路径的搜索。 间接构建候选人名单的见解和更直接构建列表的基本思想带来更多的控制。 这些接收机不那么复杂,并且通过引入每个网格增加的阈值以及连续组合和不同的网格方向来进一步改进,用于生成和累积成本信号,并以字典顺序组合,并使用校验和来减少列表并进行错误检测。
    • 7. 发明申请
    • A METHOD FOR SIGNAL PROCESSING AND A SIGNAL PROCESSOR IN AN OFDM SYSTEM
    • 信号处理的方法和OFDM系统中的信号处理器
    • US20070217327A1
    • 2007-09-20
    • US11569594
    • 2005-05-24
    • Constant BaggenSri HusenMaurice StassenHoi Tsang
    • Constant BaggenSri HusenMaurice StassenHoi Tsang
    • H04J11/00
    • H04L25/03159H04L25/0234H04L25/0236H04L2025/03414H04L2025/03605
    • 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 (y0) is obtained, followed by a first estimation of a pilot channel transfer function (H0)at pilot sub-carriers from said received signal (y0) 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 (H0). 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 (y0) and said pilot values (ap) by removal of pilot-induced interference.
    • 一种用于OFDM编码数字信号的接收机的信号处理方法。 OFDM编码数字信号作为多个频率信道中的数据符号子载波发送。 子载波的子集是具有接收机已知的导频值(导频值)的导频子载波的形式。 首先,获得接收到的信号(y 0> 0),接着在导频子载波上从所述接收信号中首先估计导频信道传递函数(H 0> 0) (y <0> 0)和所述已知导频值(a p )。 然后,在来自所述导频信道传递函数(H 0> 0)的所有子载波上执行信道传递函数(H SUB)的第二估计。 从信道传递函数(H 1> 1)执行信道传递函数(H 1> 1)的导数(H'1)的第三估计和信道传递函数 (H 3 3)从过去的OFDM符号。 最后,从所述导数(H'1> 1)执行清除的接收信号(y 1> 1)的第四估计,所述接收信号(y 0 < SUB>)和所述导频值(a p )通过去除导频干扰。
    • 8. 发明申请
    • Channel Estimation in an Ofdm System With High Doppler Shift
    • 具有高多普勒频移的OFDM系统中的信道估计
    • US20070211827A1
    • 2007-09-13
    • US11569444
    • 2005-05-23
    • Constant BaggenSri HusenMaurice StassenHoi Tsang
    • Constant BaggenSri HusenMaurice StassenHoi Tsang
    • H04L27/26
    • H04L25/0232H04L25/022H04L25/0256H04L27/2602H04L27/2647H04L2025/03496
    • 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.
    • 一种信号处理方法和用于OFDM编码数字信号的接收机的信号处理器。 OFDM编码数字信号作为多个频率信道中的数据符号子载波发送。 所述子载波的子集是具有接收机已知的值的导频子载波的形式。 执行所述导频子载波处的信道系数(H 0> 0)的第一估计,然后清除导频子载波处的估计信道系数(H SUB) 。 然后,在数据符号子载波上执行信道系数(H 1> 1)的第二估计。 通过将所述导频子载波处的接收符号(y SUB p)除以已知的导频符号(a> SUB)来执行第一估计。 假设信道频率响应在一个OFDM符号内线性变化。 因此,对于每个符号和子带,计算或内插信道频率响应及其导数。
    • 10. 发明申请
    • Method of joint decoding of possibly multilated code words
    • 联合解码可能多行码字的方法
    • US20050108616A1
    • 2005-05-19
    • US10506375
    • 2003-02-14
    • Andries HekstraConstant BaggenLudovicus Marinus Tolhuizen
    • Andries HekstraConstant BaggenLudovicus Marinus Tolhuizen
    • G11B20/10G11B20/00G11B20/18H03M13/15H03M13/37H03M13/43H03M13/45H03M13/47H03M13/00
    • H03M13/37G11B20/18
    • The invention relates to a method of decoding possibly multilated code words (r) of a code (C), wherein an information word (m) and an address word (a) are encoded into a code word (c) of said code (C) using a generator matrix (G) and wherein said address words (a) are selected such that address words (a) having a known relationship are assigned to consecutive code words (c). To provide a reliable way of decoding making use of the known relationship, a method comprising the following steps is proposed: decoding the differences (D) of a number (L−1) of pairs of possibly mutilated code words (rib, ri+1) to obtain estimates (u, v) for the differences of the corresponding pairs of code words (ci, ci+1), combining said estimates (u, v) to obtain a number (L) of at least two corrupted versions (wj) of a particular code word (c), forming a code vector (z) from said number (L) of corrupted versions (wj) of said particular code word (c) in each coordinate, decoding said code vector (z) to a decoded code word (c′) in said code (C), and—using said generator matrix (G) to obtain the information word (m) and the address word (a) embedded in said decoded code word (c′).
    • 本发明涉及一种解码码(C)的可能多个码字(r)的方法,其中信息字(m)和地址字(a)被编码成所述码(C)的码字(c) ),并且其中所述地址字(a)被选择为使得具有已知关系的地址字(a)被分配给连续码字(c)。 为了提供使用已知关系的可靠的解码方法,提出了一种包括以下步骤的方法:对可能残缺的码字对(rib,ri + 1)的数目(L-1)的数目(L-1) )以获得对应的代码字对(ci,ci + 1)的差的估计(u,v),将所述估计(u,v)组合以获得至少两个损坏版本的数量(L)(wj ),从每个坐标中的所述特定码字(c)的损坏版本(wj)的所述数目(L)形成码矢量(z),将所述码矢量(z)解码为 (C)中的解码码字(c'),并使用所述生成矩阵(G)获得嵌入在所述解码码字(c')中的信息字(m)和地址字(a)。