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    Interference and noise estimation in an OFDM system
    1.
    发明申请
    Interference and noise estimation in an OFDM system 有权
    OFDM系统中的干扰和噪声估计

    公开(公告)号：US20050002324A1

    公开(公告)日：2005-01-06

    申请号：US10809538

    申请日：2004-03-24

    申请人： Arak Sutivong ,  Ayman Naguib ,  Avneesh Agrawal

    发明人： Arak Sutivong ,  Ayman Naguib ,  Avneesh Agrawal

    IPC分类号： G01H20060101 ,  H04J11/00 ,  H04L1/20 ,  H04L27/26

    CPC分类号： H04L1/20 ,  H04L27/2647

    摘要： Noise and interference can be independently measured in a multiple user Orthogonal Frequency Division Multiplexing (OFDM) system. Co-channel interference is measured in a frequency hopping, multiple user, OFDM system by tracking the sub-carriers assigned to all users in a particular service area or cell. The composite noise plus interference can be determined by measuring the amount of received power in a sub-carrier whenever it is not assigned to any user in the cell. A value is stored for each sub-carrier in the system and the value of noise plus interference can be a weighted average of the present value with previously stored values. The noise component can be independently determined in a synchronous system. In the synchronous system, all users in a system may periodically be prohibited from broadcasting over a sub-carrier and the received power in the sub-carrier measured during the period having no broadcasts.

    摘要翻译： 噪声和干扰可以在多用户正交频分复用（OFDM）系统中独立测量。 通过跟踪分配给特定服务区域或小区中的所有用户的子载波，在跳频，多用户OFDM系统中测量同信道干扰。 复合噪声加干扰可以通过在子载波中没有分配给小区中的任何用户时测量子载波中的接收功率的量来确定。 为系统中的每个子载波存储一个值，并且噪声加干扰的值可以是具有先前存储的值的当前值的加权平均值。 噪声分量可以在同步系统中独立确定。 在同步系统中，系统中的所有用户可以周期地禁止通过子载波进行广播，并且在没有广播的时段期间测量的子载波中的接收功率。

    Channel structures for a quasi-orthogonal multiple-access communication system
    2.
    发明授权
    Channel structures for a quasi-orthogonal multiple-access communication system 有权
    准正交多址通信系统的信道结构

    公开(公告)号：US08446892B2

    公开(公告)日：2013-05-21

    申请号：US11129140

    申请日：2005-05-13

    申请人： Tingfang Ji ,  Ayman Naguib ,  Arak Sutivong ,  Dhananjay Ashok Gore ,  Alexei Gorokhov

    发明人： Tingfang Ji ,  Ayman Naguib ,  Arak Sutivong ,  Dhananjay Ashok Gore ,  Alexei Gorokhov

    IPC分类号： H04W4/00 ,  H04W72/00 ,  H04B7/216 ,  H04B7/208 ,  H04B1/00 ,  H04J1/00

    CPC分类号： H04J11/005 ,  H04B1/7143

    摘要： A channel structure has at least two channel sets. Each channel set contains multiple channels and is associated with a specific mapping of the channels to the system resources available for data transmission. Each channel set may be defined based on a channel tree having a hierarchical structure. To achieve intra-cell interference diversity, the channel-to-resource mapping for each channel set is pseudo-random with respect to the mapping for each remaining channel set. In each scheduling interval, terminals are scheduled for transmission on the forward and/or reverse link. The scheduled terminals are assigned channels from the channel sets. Multiple terminals may use the same system resources and their overlapping transmissions may be separated in the spatial domain. For example, beamforming may be performed to send multiple overlapping transmissions on the forward link, and receiver spatial processing may be performed to separate out multiple overlapping transmissions received on the reverse link.

    摘要翻译： 通道结构具有至少两个通道组。 每个信道集合包含多个信道，并且将信道的特定映射与可用于数据传输的系统资源相关联。 可以基于具有分层结构的信道树来定义每个信道集合。 为了实现小区内干扰分集，每个信道集合的信道到资源映射相对于每个剩余信道集合的映射是伪随机的。 在每个调度间隔中，终端被调度为在前向链路和/或反向链路上传输。 调度终端从通道集分配通道。 多个终端可以使用相同的系统资源，并且它们的重叠传输可以在空间域中分离。 例如，可以执行波束成形以在前向链路上发送多个重叠传输，并且可以执行接收机空间处理以分离在反向链路上接收的多个重叠传输。

    Channel Structures for a Quasi-Orthogonal Multiple-Access Communication System
    5.
    发明申请
    Channel Structures for a Quasi-Orthogonal Multiple-Access Communication System 有权
    准正交多址通信系统的信道结构

    公开(公告)号：US20100238902A1

    公开(公告)日：2010-09-23

    申请号：US12791702

    申请日：2010-06-01

    申请人： Tingfang Ji ,  Ayman Naguib ,  Arak Sutivong ,  Dhananjay Ashok Gore ,  Alexei Gorokhov

    发明人： Tingfang Ji ,  Ayman Naguib ,  Arak Sutivong ,  Dhananjay Ashok Gore ,  Alexei Gorokhov

    IPC分类号： H04W72/04 ,  H04W36/00

    CPC分类号： H04J11/005 ,  H04B1/7143

    摘要： A channel structure has at least two channel sets. Each channel set contains multiple channels and is associated with a specific mapping of the channels to the system resources available for data transmission. Each channel set may be defined based on a channel tree having a hierarchical structure. To achieve intra-cell interference diversity, the channel-to-resource mapping for each channel set is pseudo-random with respect to the mapping for each remaining channel set. In each scheduling interval, terminals are scheduled for transmission on the forward and/or reverse link. The scheduled terminals are assigned channels from the channel sets. Multiple terminals may use the same system resources and their overlapping transmissions may be separated in the spatial domain. For example, beamforming may be performed to send multiple overlapping transmissions on the forward link, and receiver spatial processing may be performed to separate out multiple overlapping transmissions received on the reverse link.

    摘要翻译： 通道结构具有至少两个通道组。 每个信道集合包含多个信道，并且将信道的特定映射与可用于数据传输的系统资源相关联。 可以基于具有分层结构的信道树来定义每个信道集合。 为了实现小区内干扰分集，每个信道集合的信道到资源映射相对于每个剩余信道集合的映射是伪随机的。 在每个调度间隔中，终端被调度为在前向链路和/或反向链路上传输。 调度终端从通道集分配通道。 多个终端可以使用相同的系统资源，并且它们的重叠传输可以在空间域中分离。 例如，可以执行波束成形以在前向链路上发送多个重叠传输，并且可以执行接收机空间处理以分离在反向链路上接收的多个重叠传输。

    Rate selection for a quasi-orthogonal communication system
    10.
    发明申请
    Rate selection for a quasi-orthogonal communication system 有权
    准正交通信系统的速率选择

    公开(公告)号：US20060234646A1

    公开(公告)日：2006-10-19

    申请号：US11150417

    申请日：2005-06-10

    申请人： Ayman Naguib ,  Alexei Gorokhov ,  Tingfang Ji ,  Dhananjay Gore ,  Arak Sutivong

    发明人： Ayman Naguib ,  Alexei Gorokhov ,  Tingfang Ji ,  Dhananjay Gore ,  Arak Sutivong

    IPC分类号： H04B7/00 ,  H04B1/00

    CPC分类号： H04L1/0019 ,  H04L1/0003 ,  H04L1/0016 ,  H04L1/06 ,  H04L25/0212 ,  H04L25/0228 ,  H04L25/0242 ,  H04L25/0256

    摘要： To select a rate for a transmitter in a communication system, a receiver obtains a channel response estimate and a received SINR estimate for the transmitter, e.g., based on a pilot received from the transmitter. The receiver computes a hypothesized SINR for the transmitter based on the channel response estimate and the received SINR estimate. The receiver then selects a rate for the transmitter based on (1) the hypothesized SINR and (2) characterized statistics of noise and interference at the receiver for the transmitter, which may be given by a probability density function (PDF) of SINR loss with respect to the hypothesized SINR. A look-up table of rate versus hypothesized SINR may be generated a priori for the PDF of SINR loss. The receiver may then apply the hypothesized SINR for the transmitter to the look-up table, which then provides the rate for the transmitter.

    摘要翻译： 为了在通信系统中选择发射机的速率，接收机例如基于从发射机接收到的导频，获得用于发射机的信道响应估计和接收到的SINR估计。 接收机基于信道响应估计和接收的SINR估计来计算发射机的假设SINR。 接收机然后基于（1）假设的SINR和（2）用于发射机的接收机处的噪声和干扰的特征统计来选择发射机的速率，其可以由SINR丢失的概率密度函数（PDF）给出， 尊重假设的SINR。 速率与假设SINR的查找表可能会先于SINR损失的PDF生成。 然后，接收机可以将发射机的假设SINR应用于查找表，然后查找表提供发射机的速率。