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18 条记录 (耗时 0.011 秒)

    Method for Estimating Time-Varying and Frequency-Selective Channels
    1.
    发明申请
    Method for Estimating Time-Varying and Frequency-Selective Channels 失效
    估计时变和频率选择通道的方法

    公开(公告)号：US20120082252A1

    公开(公告)日：2012-04-05

    申请号：US12894994

    申请日：2010-09-30

    申请人： Ramesh Annavajjala ,  Hobin Kim

    发明人： Ramesh Annavajjala ,  Hobin Kim

    IPC分类号： H04L27/28

    CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L25/0204 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/0228 ,  H04L25/0242

    摘要： Time-varying and frequency-selective channels in an orthogonal frequency division multiplexing (OFDM) network are estimated by first storing, in a buffer at a receiver, a received signal corresponding to a set of pilot tones of a set of OFDM symbols, wherein the pilot tones are predetermined and inserted in frequency subcarriers and time slots of the OFDM symbol. A covariance matrix of the received signal is estimated. A diagonal matrix is estimated based on the covariance matrix and a variance of noise in the received signal. The diagonal matrix indicates delays of non-zero paths in a time domain. A channel impulse response (CIR) for each OFDM symbol is estimated using the diagonal matrix, and the received signal. Then, the CIR is transformed to the frequency domain to obtain the channel frequency response (CFR).

    摘要翻译： 通过首先在接收机的缓冲器中存储对应于一组OFDM符号的一组导频音调的接收信号来估计正交频分复用（OFDM）网络中的时变和频率选择性信道，其中， 导频音被预先确定并插入在OFDM符号的频率子载波和时隙中。 估计接收信号的协方差矩阵。 基于协方差矩阵和接收信号中的噪声方差来估计对角矩阵。 对角矩阵表示时域中非零路径的延迟。 使用对角矩阵和接收信号来估计每个OFDM符号的信道脉冲响应（CIR）。 然后，将CIR转换到频域以获得信道频率响应（CFR）。

    Method for estimating time-varying and frequency-selective channels
    2.
    发明授权
    Method for estimating time-varying and frequency-selective channels 失效
    估计时变频率选择频道的方法

    公开(公告)号：US08509330B2

    公开(公告)日：2013-08-13

    申请号：US12894994

    申请日：2010-09-30

    申请人： Ramesh Annavajjala ,  Hobin Kim

    发明人： Ramesh Annavajjala ,  Hobin Kim

    IPC分类号： H04K1/10

    CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L25/0204 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/0228 ,  H04L25/0242

    摘要： Time-varying and frequency-selective channels in an orthogonal frequency division multiplexing (OFDM) network are estimated by first storing, in a buffer at a receiver, a received signal corresponding to a set of pilot tones of a set of OFDM symbols. The pilot tones are predetermined and inserted in frequency subcarriers and time slots of the OFDM symbol. A covariance matrix of the received signal is estimated. A diagonal matrix is estimated based on the covariance matrix and a variance of noise in the received signal. The diagonal matrix indicates delays of non-zero paths in a time domain. A channel impulse response (CIR) for each OFDM symbol is estimated using the diagonal matrix, and the received signal. Then, the CIR is transformed to the frequency domain to obtain the channel frequency response (CFR).

    摘要翻译： 通过首先在接收机的缓冲器中存储对应于一组OFDM符号的一组导频音调的接收信号来估计正交频分复用（OFDM）网络中的时变和频率选择信道。 导频音被预先确定并插入在OFDM符号的频率子载波和时隙中。 估计接收信号的协方差矩阵。 基于协方差矩阵和接收信号中的噪声方差来估计对角矩阵。 对角矩阵表示时域中非零路径的延迟。 使用对角矩阵和接收信号来估计每个OFDM符号的信道脉冲响应（CIR）。 然后，将CIR转换到频域以获得信道频率响应（CFR）。

    METHOD OF EFFICIENTLY UTILIZING RESOURCES IN A WIRELESS COMMUNICATION SYSTEM
    5.
    发明申请
    METHOD OF EFFICIENTLY UTILIZING RESOURCES IN A WIRELESS COMMUNICATION SYSTEM 有权
    在无线通信系统中有效利用资源的方法

    公开(公告)号：US20080089281A1

    公开(公告)日：2008-04-17

    申请号：US11767446

    申请日：2007-06-22

    申请人： Young Yoon ,  Li-Hsiang Sun ,  Sang Kim ,  Shu Wang ,  Suk Lee ,  Hobin Kim

    发明人： Young Yoon ,  Li-Hsiang Sun ,  Sang Kim ,  Shu Wang ,  Suk Lee ,  Hobin Kim

    IPC分类号： H04Q7/00

    CPC分类号： H04W72/042

    摘要： A method of transmitting data via a control channel in a wireless communication system is disclosed. More specifically, the method includes transmitting a message including information on which control channel resources are used or unused, and transmitting data via the unused control channel which is allocated to at least one user, wherein the data is an added portion related to at least one sub-packet transmitted on a data channel

    摘要翻译： 公开了一种通过无线通信系统中的控制信道发送数据的方法。 更具体地，该方法包括发送包括关于使用或未使用哪个控制信道资源的信息的消息，以及经由未分配给至少一个用户的未使用的控制信道发送数据，其中该数据是与至少一个 在数据信道上发送的子包

    Access probe randomization for wireless communication system
    7.
    发明授权
    Access probe randomization for wireless communication system 有权
    无线通信系统接入探测随机化

    公开(公告)号：US08379606B2

    公开(公告)日：2013-02-19

    申请号：US11534520

    申请日：2006-09-22

    申请人： Sang G Kim ,  Shu Wang ,  Young C Yoon ,  Suk Woo Lee ,  Li-Hsiang Sun ,  Hobin Kim

    发明人： Sang G Kim ,  Shu Wang ,  Young C Yoon ,  Suk Woo Lee ,  Li-Hsiang Sun ,  Hobin Kim

    IPC分类号： H04J3/00 ,  H04L12/413

    CPC分类号： H04W74/085 ,  H04W74/0833

    摘要： A method and apparatus for randomizing access probes from co-located mobile terminals in order to reduce collisions is provided. By each mobile terminal or group of mobile terminals computing a random delay between a minimum delay value and a maximum delay value and using the random delay to delay the starting time of access probes, collisions between access probes from different mobile terminals may be reduced.

    摘要翻译： 提供了一种从同位移动终端随机化接入探针以减少冲突的方法和装置。 通过每个移动终端或移动终端组计算最小延迟值和最大延迟值之间的随机延迟，并且使用随机延迟来延迟接入探测的开始时间，可以减少来自不同移动终端的接入探测之间的冲突。

    Method for performance enhancement in a cell edge region
    8.
    发明授权
    Method for performance enhancement in a cell edge region 有权
    细胞边缘区域的性能增强方法

    公开(公告)号：US08274927B2

    公开(公告)日：2012-09-25

    申请号：US11671432

    申请日：2007-02-05

    申请人： Sang Gook Kim ,  Young C. Yoon ,  Soonyil Kwon ,  Shu Wang ,  Suk Woo Lee ,  Li-Hsiang Sun ,  Hobin Kim

    发明人： Sang Gook Kim ,  Young C. Yoon ,  Soonyil Kwon ,  Shu Wang ,  Suk Woo Lee ,  Li-Hsiang Sun ,  Hobin Kim

    IPC分类号： H04L1/00

    CPC分类号： H04L1/1812 ,  H04B7/022 ,  H04L1/0001 ,  H04L1/06 ,  H04L1/1819 ,  H04L1/1893 ,  H04L5/023 ,  H04L27/2608 ,  H04L2001/0092 ,  H04L2001/0096 ,  H04W36/18 ,  H04W52/04

    摘要： A method for receiving data at different frequencies includes receiving a first transmission packet including data at a first carrier frequency, and receiving a second transmission packet comprising data at a second carrier frequency. The method further includes maintaining communication with transmission entities which transmit the first and second transmission packets, and identifying reception quality of the first and second transmission packets. In addition, a method for retransmitting subpackets includes transmitting a first subpacket of a packet transmission from at least two transmitting entities. Upon receiving a non-acknowledgement NACK generated responsive to the first subpacket, the method further includes alternating transmission of subsequent subpackets from different transmitting entities. Upon receiving an acknowledgement ACK generated responsive to any subpackets of the packet transmission, the method further includes transmitting a first subpacket of a new packet transmission.

    摘要翻译： 用于以不同频率接收数据的方法包括：以第一载波频率接收包括数据的第一传输分组，以及接收包含第二载波频率的数据的第二传输分组。 该方法还包括维护与发送第一和第二传输分组的传输实体的通信，以及识别第一和第二传输分组的接收质量。 此外，重发子分组的方法包括从至少两个发送实体发送分组传输的第一子分组。 在接收到响应于第一子分组产生的未确认NACK之后，该方法还包括交替地从不同发送实体发送后续子分组。 在接收到响应于分组传输的任何子分组产生的确认ACK时，该方法还包括发送新分组传输的第一子分组。