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    Method and system for generating antenna selection signals in OFDM tranceivers with fewer RF chains than antennas in MIMO wireless networks
    31.
    发明授权
    Method and system for generating antenna selection signals in OFDM tranceivers with fewer RF chains than antennas in MIMO wireless networks 有权
    用于在MIMO无线网络中具有比天线更少的RF链的OFDM收发机中生成天线选择信号的方法和系统

    公开(公告)号：US08824420B2

    公开(公告)日：2014-09-02

    申请号：US11953452

    申请日：2007-12-10

    申请人： Neelesh B. Mehta ,  Erdem Bala ,  Jinyun Zhang

    发明人： Neelesh B. Mehta ,  Erdem Bala ,  Jinyun Zhang

    IPC分类号： H04W4/00 ,  H04B1/44

    CPC分类号： H04B7/061 ,  H04B7/0691 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0228

    摘要： A method and system generating signal to select a subset of antennas from a set of antennas to transmit user data in a wireless communication system. User data are transmitted during a first transmission time intervals (TTI) using a first subset of antennas. Pilot tones are transmitted during a second TTI using a second subset of antennas. Corresponding channels are estimated for the first subset of antennas and the second subset of antennas from the user data and the pilot tones. Then, based on the estimating, an optimal subset of antenna is selected from the first subset of antennas and the second subset of antennas to transmit the user data during a sequent TTI, and in which the selecting is performed adaptively.

    摘要翻译： 一种方法和系统产生信号以从一组天线中选择天线的子集以在无线通信系统中传送用户数据。 在第一传输时间间隔（TTI）期间使用第一天线子集来发送用户数据。 在第二TTI期间使用第二天线子集来传送导频音调。 对于天线的第一子集和来自用户数据和导频音调的第二子天线子集估计相应的信道。 然后，基于估计，从第一天线子集和第二天线子集中选择天线的最佳子集，以便在后续TTI期间发送用户数据，并且其中选择被自适应地执行。

    Cooperative relay networks using rateless codes
    32.
    发明授权
    Cooperative relay networks using rateless codes 失效
    使用无码代码的合作中继网络

    公开(公告)号：US07673219B2

    公开(公告)日：2010-03-02

    申请号：US11377711

    申请日：2006-03-16

    申请人： Andreas F. Molisch ,  Neelesh B. Mehta ,  Jonathan S. Yedidia ,  Jinyun Zhang

    发明人： Andreas F. Molisch ,  Neelesh B. Mehta ,  Jonathan S. Yedidia ,  Jinyun Zhang

    IPC分类号： G11C29/00

    CPC分类号： H04B7/026 ,  H04B7/15592 ,  H04L1/06 ,  H04L1/0618 ,  H04L2001/0097 ,  H04W52/46

    摘要： A system and method for communicating information in a wireless cooperative relay network of nodes, the nodes including a source, a set of relays, and a destination. The source broadcasts a code word encoded as a data stream using a rateless code. The relays receive the data stream, decode the data stream to recover the code word, and reencode and transmit the recovered code word as the data stream with the rateless code. The destination receives and decodes the reencoded data streams to recover the code word.

    摘要翻译： 一种用于在节点的无线协作中继网络中传送信息的系统和方法，所述节点包括源，一组中继和目的地。 源使用无码代码广播编码为数据流的码字。 继电器接收数据流，解码数据流以恢复代码字，并重新编码并发送恢复的代码字作为数据流与无码代码。 目的地接收并解码重新编码的数据流以恢复码字。

    Optimal signaling and selection verification for transmit antenna selection with erroneous feedback
    33.
    发明申请
    Optimal signaling and selection verification for transmit antenna selection with erroneous feedback 审中-公开
    用于发送天线选择的错误反馈的最优信令和选择验证

    公开(公告)号：US20090129501A1

    公开(公告)日：2009-05-21

    申请号：US11990650

    申请日：2005-08-19

    申请人： Neelesh B. Mehta ,  Yabo Li ,  Andreas F. Molisch ,  Jinyun Zhang

    发明人： Neelesh B. Mehta ,  Yabo Li ,  Andreas F. Molisch ,  Jinyun Zhang

    IPC分类号： H04L27/00

    CPC分类号： H04B7/061

    摘要： A method is provided for receiving data at a receiver via a communication channel from a transmitter having at least two transmitter antennas, the method including: receiving (S204) a codebook including an assignment of at least two respective codewords to the at least two transmitter antennas, the assignment being based at least in part on a characteristic of the communication channel; detecting a state of the communication channel by which the receiver can communicate with the transmitter; selecting (S206) at least one desired transmitter antenna from the at least two antennas based at least in part on the detected state of the communication channel; transmitting (S208) to the transmitter a codeword corresponding to the at least one desired transmitter antenna; and receiving (S210) data at the receiver transmitted by the transmitter.

    摘要翻译： 提供了一种用于经由来自具有至少两个发射机天线的发射机的通信信道在接收机处接收数据的方法，所述方法包括：接收（S204）包括至少两个相应码字的分配的码本到所述至少两个发射机天线 所述分配至少部分地基于所述通信信道的特性; 检测接收机可以与发射机通信的通信信道的状态; 至少部分地基于所检测到的通信信道的状态，从所述至少两个天线中选择（S206）至少一个期望的发射机天线; 向所述发射机发送对应于所述至少一个所需发射机天线的码字（S208）; 以及在由发射机发送的接收机处接收（S210）数据。

    Pilot and data signals for MIMO systems using channel statistics
    34.
    发明授权
    Pilot and data signals for MIMO systems using channel statistics 失效
    使用信道统计的MIMO系统的导频和数据信号

    公开(公告)号：US07443925B2

    公开(公告)日：2008-10-28

    申请号：US10895167

    申请日：2004-07-20

    申请人： Neelesh B. Mehta ,  Fadel F. Digham ,  Andreas F. Molisch ,  Jinyun Zhang

    发明人： Neelesh B. Mehta ,  Fadel F. Digham ,  Andreas F. Molisch ,  Jinyun Zhang

    IPC分类号： H04L27/04

    CPC分类号： H04B7/0417 ,  H04B7/0443 ,  H04B7/0615 ,  H04B7/0626 ,  H04L1/0687 ,  H04W52/42

    摘要： A method generates signals in a transmitter of a multiple-input, multiple-output wireless communications system. The transmitter includes Nt transmit antennas. A transmit covariance matrix Rt determined using statistical state information of a channel. The transmit covariance Rt matrix is decomposed using transmit eigenvalues Λt to obtain a transmit eigenspace Ut according to Rt=UtΛtU†t, where † is a Hermitian transpose. A pilot eigenspace Up is set equal to the transmit eigenspace Ut. A NtxTp block of pilot symbols Xp is generated from the pilot eigenspace Up and pilot eigenvalue Λp according to Xp=UpΛp1/2. A data eigenspace Ud is set equal to the transmit eigenspace Ut. In addition, a Nt×Nt data covariance matrix Qd is generated according to UdΛdU†d, where Λd are data eigenvalues. A NtxTd block of data symbols is generated, such that an average covariance of each of the columns in the block of data symbols Xd equals the data covariance matrix Qd. The block of pilot and data symbols form the signals to be transmitted.

    摘要翻译： 一种方法在多输入多输出无线通信系统的发射机中产生信号。 发射机包括N T个发射天线。 使用信道的统计状态信息确定发送协方差矩阵R t t。 使用发射特征值λλt来分解发射协方差矩阵，以获得根据R t的t 1的发送本征空间U T t， 其中†是Hermitian转置。其中†是Hermitian转置。 飞行员本征空间U P p被设置为等于发射本征空间U T t。 从导频符号空间U P1和导频特征值Lambda生成导频符号X P p P块的导频符号X P＆lt; P＆lt;＆lt; 根据X＆lt; p＆lt; p＆lt; p＆lt; p＆lt; p＆lt; p＆gt;＆lt; 1/2＆gt; 数据本征空间U D D被设置为等于发送本征空间U T t。 另外，根据U SUB ambda is is is is is is is is is is is is is is is is is SUB is according according according according according according according according according according according according according according according according according according according according according according according according according 其中λλd是数据特征值。 生成数据符号块，使得数据符号块X中的每个列的平均协方差为 等于数据协方差矩阵Q 。 导频块和数据符号块形成要传输的信号。

    Method for representing a combination of signals with a distribution of a single lognormal random variable
    37.
    发明授权
    Method for representing a combination of signals with a distribution of a single lognormal random variable 有权

    公开(公告)号：US07280942B2

    公开(公告)日：2007-10-09

    申请号：US11203440

    申请日：2005-08-15

    申请人： Neelesh B. Mehta ,  Andreas F. Molisch ,  Jingxian Wu ,  Jinyun Zhang

    发明人： Neelesh B. Mehta ,  Andreas F. Molisch ,  Jingxian Wu ,  Jinyun Zhang

    IPC分类号： G06F15/00

    CPC分类号： H04B17/23

    摘要： A method analyzes a set of signal acquired from a physical system. A set of parameters characterizing the set of signals is measured. The parameters can include the mean and the variance of the power of the signal, and a Rician factor. A first point and a second point of a moment generating function for a combination of the set of signals are evaluated according to the set of parameters to obtain a first sample and a second sample, respectively. First and second equations are defined. The equations respectively have an approximation of a moment generation function of a lognormal random variable representing the combination of the set of signals, at the first point and the second point, on the left side, and the first and second sample on the right side. The two equations are solved to obtain a mean and a variance of the lognormal random variable representing a distribution of the combination of the set of the signals.

    Method and system for selecting antennas adaptively in OFDMA networks
    40.
    发明授权
    Method and system for selecting antennas adaptively in OFDMA networks 失效
    在OFDMA网络中自适应选择天线的方法和系统

    公开(公告)号：US07756099B2

    公开(公告)日：2010-07-13

    申请号：US11777356

    申请日：2007-07-13

    申请人： Zhifeng Tao ,  Chun Nie ,  Neelesh B. Mehta ,  Andreas F. Molisch ,  Jinyun Zhang

    发明人： Zhifeng Tao ,  Chun Nie ,  Neelesh B. Mehta ,  Andreas F. Molisch ,  Jinyun Zhang

    IPC分类号： H04B7/208

    CPC分类号： H04B7/0628 ,  H04B7/0404 ,  H04B7/0413 ,  H04B7/0691 ,  H04B7/0874 ,  H04B7/0888 ,  H04B17/309

    摘要： A method selects antennas in an OFDMA network. A channel state of a downlink is measured using a downlink subframe received in a mobile station from a base station. A channel state of an uplink is measured using an uplink subframe received in the base station from the mobile station. Next, the method compares the channel states to determine whether the downlink and the uplink are reciprocal or not. The mobile station can perform receive antenna selection based on the quality of the downlink channel state. The mobile station can also perform transmit antenna selection when instructed by the base station.

    摘要翻译： 一种方法选择OFDMA网络中的天线。 使用从基站在移动台中接收的下行链路子帧来测量下行链路的信道状态。 使用从移动站在基站中接收的上行链路子帧来测量上行链路的信道状态。 接下来，该方法比较信道状态以确定下行链路和上行链路是否是倒数的。 移动台可以基于下行链路信道状态的质量来执行接收天线选择。 当基站指示时，移动站也可以执行发射天线选择。