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1. 发明申请

WO2011060532A8 ESTIMATING RESIDUAL CARRIER FREQUENCY OFFSET IN AN OFDM SIGNAL 审中-公开
标题翻译：在OFDM信号中估计残留载波频偏
公开(公告)号：WO2011060532A8
公开(公告)日：2012-08-30
申请号：PCT/CA2010001801
申请日：2010-11-18
申请人： WI LAN INC , LI LINGJIE , WU SHIQUAN
发明人： LI LINGJIE , WU SHIQUAN
IPC分类号： H04B7/208 , H04J11/00
CPC分类号： H04L27/2671 , H04L27/0014 , H04L27/266 , H04L27/2675 , H04L27/2695 , H04L2027/003 , H04L2027/0067
摘要： A residual carrier frequency offset of a signal received by a receiver, which has a local frequency oscillator that generates a carrier frequency different from a carrier frequency generated by a local frequency oscillator at a transmitter that transmitted the received signal is estimated using first and second channel impulse responses derived from first and second portions of the received signal, an estimated phase difference between the first and second channel impulse responses, and an estimate of the residual carrier frequency offset computed using the estimated phase differences. The residual carrier frequency offset is estimated after most of the carrier frequency offset has been removed from the received signal using conventional means.
摘要翻译：由发送接收信号的发射机产生与本地频率振荡器产生的载波频率不同的载波频率的接收机接收的信号的残余载波频率偏移是使用第一和第二信道从接收信号的第一和第二部分导出的脉冲响应，第一和第二信道脉冲响应之间的估计相位差以及使用估计的相位差计算出的残余载波频率偏移的估计。在使用常规方法从接收信号中去除了大部分载波频率偏移之后，估计残余载波频率偏移。

2. 发明申请

WO2012065270A1 SYSTEMS AND METHODS FOR CHANNEL TRACKING IN OFDMA 审中-公开
标题翻译： OFDMA中的通道跟踪系统和方法
公开(公告)号：WO2012065270A1
公开(公告)日：2012-05-24
申请号：PCT/CA2011/050714
申请日：2011-11-17
申请人： WI-LAN, INC. , LI, Lingjie , MOHER, Michael, L. , YEE, Jung
发明人： LI, Lingjie , MOHER, Michael, L. , YEE, Jung
IPC分类号： H04W72/04 , H04J11/00 , H04W74/04
CPC分类号： H04L5/0007 , H04L5/0044 , H04L5/0048 , H04L5/0094
摘要： Methods and systems for operating a base station communicating with one or more user terminals in an orthogonal frequency division multiple access (OFDMA) system where the one or more user terminals are configured to insert pilots in up stream (US) bursts every nth symbol on each subcarrier, where n is an integer, are provided. The method includes identifying a needed amount of US bandwidth to be allocated to a user terminal; determining the subcarriers and the number of symbols per subcarrier to be allocated to meet the identified need in a burst; allocating, for the user terminal, a set of subcarriers and a number of symbols for each member of the set of subcarriers, wherein sufficient symbols per subcarrier per burst are allocated to allow user terminal to send two or more pilots per subcarrier per burst; and transmitting a message to the user terminal, the message identifying the allocated subcarriers and the number of symbols allocated for each subcarrier.
摘要翻译：用于在正交频分多址（OFDMA）系统中操作与一个或多个用户终端进行通信的基站的方法和系统，其中所述一个或多个用户终端被配置为在每个第n个符号上的上行（US）突发中插入导频副载波，其中n是整数。该方法包括识别要分配给用户终端的US带宽所需的量; 确定要在分组中满足所识别的需要的子载波和每个子载波的符号数量; 为用户终端分配一组子载波和每个子载波组的每个成员的符号数，其中每个突发的每个子载波的足够符号被分配以允许用户终端每个突发发送两个或更多个每个子载波的导频; 以及向所述用户终端发送消息，所述消息标识所分配的副载波和为每个副载波分配的符号数。

3. 发明申请

WO2011026229A1 SYMBOL SYNCHRONIZATION METHOD AND APPARATUS 审中-公开
标题翻译：符号同步方法和装置
公开(公告)号：WO2011026229A1
公开(公告)日：2011-03-10
申请号：PCT/CA2010/001359
申请日：2010-09-01
申请人： WI-LAN INC. , LI, Lingjie , WU, Shiquan
发明人： LI, Lingjie , WU, Shiquan
IPC分类号： H04L27/01 , H04J11/00 , H04L5/06 , H04L7/04 , H04W56/00
CPC分类号： H04L27/2665 , H04L27/2607 , H04L27/2663 , H04L27/2678 , H04L27/2688
摘要： A received signal comprises a continuous sequence of symbols φ 1 , φ 2 ,... φ n , each represented by a sequence of samples X 0 , X 2 ,...X n-1 , and wherein the symbols have a guard period GP of duration T gp at the beginning thereof. Each guard period contains a cyclic prefix with the same subsequence of samples as a tail end portion of the associated symbol. The symbols are identified by delaying the received signal by a fixed number of samples, computing the correlation of the received signal with the delayed signal, computing the summation of said correlation over a window of duration T i ,, wherein T i >T gp , and sliding the window over the correlation to find a characteristic point or region. The start of each symbol for further processing is selected from the characteristic point or region. By increasing the duration of the window, more robust performance can be achieved, especially in multipath conditions.
摘要翻译：接收到的信号包括由样本X0，X2，... Xn-1的序列表示的符号f1，f2，... fn的连续序列，并且其中符号具有在时间Tgp的保护周期GP 开始。每个保护周期包含循环前缀，其具有与相关联的符号的尾端部分相同的样本子序列。通过将接收到的信号延迟固定数量的样本来识别符号，计算接收信号与延迟信号的相关性，计算在持续时间Ti的窗口上的所述相关性的总和，其中Ti> Tgp，并滑动关联的窗口，找到一个特征点或区域。从特征点或区域中选择用于进一步处理的每个符号的开始。通过增加窗口的持续时间，可以实现更强大的性能，特别是在多径条件下。

4. 发明申请

WO2011060533A1 METHODS AND APPARATUS FOR AN INTERLEAVING SCHEME IN OFDM/OFDMA SYSTEMS 审中-公开
标题翻译： OFDM / OFDMA系统中交织方案的方法和装置
公开(公告)号：WO2011060533A1
公开(公告)日：2011-05-26
申请号：PCT/CA2010/001818
申请日：2010-11-18
申请人： WI-LAN, INC. , LI, Lingjie , WU, Shiquan
发明人： LI, Lingjie , WU, Shiquan
IPC分类号： H04J11/00 , H03M13/27 , H04W28/04
CPC分类号： H04L5/0044 , H04L1/0043 , H04L1/0071
摘要： An interleaver of an OFDM/OFDMA transceiver reshapes a binary vector to be transmitted into a matrix, rotates bits in respective columns of the matrix, divides respective rows of the matrix into an integer number of interleaving blocks, and interleaves the bits in the respective interleaving blocks.
摘要翻译： OFDM / OFDMA收发器的交织器将要发送到矩阵中的二进制向量重新整形，旋转矩阵的各列中的比特，将矩阵的各行划分为整数个交织块，并且交织相应交织中的比特块。

5. 发明申请

WO2011060532A1 ESTIMATING RESIDUAL CARRIER FREQUENCY OFFSET IN AN OFDM SIGNAL 审中-公开
标题翻译：在OFDM信号中估计残留载波频偏
公开(公告)号：WO2011060532A1
公开(公告)日：2011-05-26
申请号：PCT/CA2010/001801
申请日：2010-11-18
申请人： WI-LAN, INC. , LI, Lingjie , WU, Shiquan
发明人： LI, Lingjie , WU, Shiquan
IPC分类号： H04B7/208 , H04J11/00
CPC分类号： H04L27/2671 , H04L27/0014 , H04L27/266 , H04L27/2675 , H04L27/2695 , H04L2027/003 , H04L2027/0067
摘要： A residual carrier frequency offset of a signal received by a receiver, which has a local frequency oscillator that generates a carrier frequency different from a carrier frequency generated by a local frequency oscillator at a transmitter that transmitted the received signal is estimated using first and second channel impulse responses derived from first and second portions of the received signal, an estimated phase difference between the first and second channel impulse responses, and an estimate of the residual carrier frequency offset computed using the estimated phase differences. The residual carrier frequency offset is estimated after most of the carrier frequency offset has been removed from the received signal using conventional means.
摘要翻译：由发送接收信号的发射机产生与本地频率振荡器产生的载波频率不同的载波频率的接收机接收的信号的残余载波频率偏移是使用第一和第二信道从接收信号的第一和第二部分导出的脉冲响应，第一和第二信道脉冲响应之间的估计相位差以及使用估计的相位差计算出的残余载波频率偏移的估计。在使用常规方法从接收信号中去除了大部分载波频率偏移之后，估计残余载波频率偏移。

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