公开(公告)号：US07356100B2

公开(公告)日：2008-04-08

申请号：US10616875

申请日：2003-07-10

申请人： Andreas Molisch ,  Ye Li ,  Jinyun Zhang

发明人： Andreas Molisch ,  Ye Li ,  Jinyun Zhang

IPC分类号： H04L27/06 ,  H04B1/00

CPC分类号： H04B1/71637 ,  H04B1/709 ,  H04B1/719 ,  H04L1/203 ,  H04L25/0212 ,  H04L25/0226 ,  H04L25/03012 ,  H04L2025/03484

摘要： A method estimates a channel impulse response in an ultra wide bandwidth (UWB) system. Multiple training sequences modulated at a chip rate are received. Each training sequence is sampled by parallel with multiple correlators at sampling rate substantially slower than the chip rate to obtain a samples over a time interval of the impulse response at a resolution substantially equal to the chip rate, and then estimating the channel impulse response from these samples.

摘要翻译： 一种方法估计超宽带（UWB）系统中的信道脉冲响应。 接收以码片速率调制的多个训练序列。 每个训练序列以与码片速率相比更慢的采样速率与多个相关器并联采样，以在基本上等于码片速率的分辨率下在脉冲响应的时间间隔上获得采样，然后从这些估计信道脉冲响应 样品。

公开(公告)号：US20060056533A1

公开(公告)日：2006-03-16

申请号：US10939284

申请日：2004-09-10

申请人： Andreas Molisch ,  Jianxuan Du ,  Ye Li ,  Daqing Du ,  Jinyun Zhang

发明人： Andreas Molisch ,  Jianxuan Du ,  Ye Li ,  Daqing Du ,  Jinyun Zhang

IPC分类号： H04L1/02

CPC分类号： H04L1/0687

摘要： A method minimizes a rate for feeding back channel state information from a receiver to a transmitter in a multi-input, multi-output communications systems. A temporal autocorrelation function of the channel between the transmitter and the receiver is determined. A spatial covariance information is estimated of the channel. Then, the minimum rate for feeding back channel state information from the receiver to the transmitter is based on actual channel state information and the estimated spatial covariance information and the temporal autocorrelation function.

摘要翻译： 一种方法使在多输入多输出通信系统中将信道状态信息从接收机反馈到发射机的速率最小化。 确定发射机和接收机之间的信道的时间自相关函数。 估计通道的空间协方差信息。 然后，从接收机向发射机反馈信道状态信息的最小速率基于实际信道状态信息和估计的空间协方差信息和时间自相关函数。

公开(公告)号：US20060002414A1

公开(公告)日：2006-01-05

申请号：US10872578

申请日：2004-06-21

申请人： Jianxuan Du ,  Andreas Molisch ,  Jinyun Zhang

发明人： Jianxuan Du ,  Andreas Molisch ,  Jinyun Zhang

IPC分类号： H04L12/28 ,  H04L12/56

CPC分类号： H04L1/0002 ,  H04L1/0019 ,  H04L1/0656

摘要： A method allocates data rates to layers to be transmitted in a multiple input, multiple output communications system. An input data stream is demultiplexed into multiple layers. For each layer, determine statistics representing a capacity of the layer based on past observations of transmitting the layer through a channel. For each layer, determine an optimum data rate based on the statistics. For each layer, determine if the optimum data rate is less than a minimum data rate of a set of available bit rates, and, if true, selecting, for a particular layer, the minimum data rate from the set of available data rates, and otherwise, if false, selecting, for the particular layer, a closest data rate from the set of available data rates that is less than the optimum data rate.

摘要翻译： 一种方法将数据速率分配给要在多输入多输出通信系统中发送的层。 输入数据流被解复用为多层。 对于每个层，基于通过信道传输层的过去观察来确定表示层的容量的统计信息。 对于每一层，根据统计数据确定最佳数据速率。 对于每个层，确定最佳数据速率是否小于一组可用比特率的最小数据速率，并且如果为真，则从一组可用数据速率为特定层选择最小数据速率，以及 否则，如果为false，则对于特定层，从小于最佳数据速率的可用数据速率集合中选择最接近的数据速率。

公开(公告)号：US20050265218A1

公开(公告)日：2005-12-01

申请号：US10856708

申请日：2004-05-28

申请人： Andreas Molisch ,  Ye Li ,  Jinyun Zhang

发明人： Andreas Molisch ,  Ye Li ,  Jinyun Zhang

IPC分类号： H04J11/00 ,  H04B1/69 ,  H04B1/713 ,  H04B7/08 ,  H04B7/26 ,  H04J13/00 ,  H04L25/02 ,  H04L27/26

CPC分类号： H04B1/719 ,  H04L25/022 ,  H04L25/0224 ,  H04L27/261

摘要： A method suppresses interference in a time-frequency hopped, ultra wide bandwidth system. Signals corresponding to a transmitted symbol are received. The received signals are frequency demodulated, and a coefficient vector w that minimizes a cost function C ⁡ ( w n ) = 1 ∑ k ⁢ λ  n - k  ⁢ ∑ k ⁢ λ  n - k  ⁢   ⁢  w n H ⁢ x k - c k  2 , is estimated, where λ is a weighting factor between 0, x is a vector representing the received signals, H is a frequency response of a channel used to transmit the symbol, and c is a known training symbol. A coefficient vector, ŵn={circumflex over (R)}n−1{circumflex over (d)}n, is determined, where a correlation matrix for the received signals is R ^ n = 1 ∑ k ⁢ λ  n - k  ⁢ ∑ k ⁢ λ  n - k  ⁢   ⁢ x k ⁢ x k H , and an estimate of a crosscorrelation is d ^ n = 1 ∑ k ⁢ λ  n - k  ⁢ ∑ k ⁢ λ  n - k  ⁢   ⁢ x k ⁢ c k * . The received signals are then combined according to c ^ n = 1 C ⁡ ( w ^ n ) ⁢ w ^ n H ⁢ x n = 1 1 - w ^ n H ⁢   ⁢ d ^ n ⁢ w ^ n H ⁢ x n .

公开(公告)号：US20050048933A1

公开(公告)日：2005-03-03

申请号：US10720596

申请日：2003-11-24

申请人： Jingxian Wu ,  Jinyun Zhang ,  Andreas Molisch

发明人： Jingxian Wu ,  Jinyun Zhang ,  Andreas Molisch

IPC分类号： H04B7/06 ,  H04L1/06 ,  H04B7/02

CPC分类号： H04B7/0626 ,  H04B7/0658 ,  H04B7/0669 ,  H04L1/0618 ,  H04L1/0693

摘要： A wireless communication system includes a transmitter and a receiver. The transmitter includes multiple groups of transmit antennas. Input symbols are generated and then orthogonal space-time block is encoded to produce a data stream for each group of transmit antennas. Each data stream is adaptively linear space encoded to produce an encoded signal for each transmit antenna of each group according to feedback information for the group. The receiver includes a single receive antenna, a module for measuring a phase of a channel impulse response for each transmit antenna. The feedback information is determined independently for each group of transmit antennas from the channel impulse responses. The feedback information for each group of transmit antennas is sent to the transmitter.

摘要翻译： 无线通信系统包括发射机和接收机。 发射机包括多组发射天线。 生成输入符号，然后对正交空时块进行编码，以产生每组发射天线的数据流。 每个数据流被自适应地线性空间编码，以根据组的反馈信息为每个组的每个发射天线产生编码信号。 接收机包括单个接收天线，用于测量每个发射天线的信道脉冲响应的相位的模块。 对于每组发射天线，信道脉冲响应独立地确定反馈信息。 每组发射天线的反馈信息被发送到发射机。

公开(公告)号：US20050268202A1

公开(公告)日：2005-12-01

申请号：US10857042

申请日：2004-05-28

申请人： Andreas Molisch ,  Daqing Gu ,  Jinyun Zhang ,  Jianxuan Du ,  Ye Li

发明人： Andreas Molisch ,  Daqing Gu ,  Jinyun Zhang ,  Jianxuan Du ,  Ye Li

IPC分类号： H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  G11C29/00

CPC分类号： H04L1/005 ,  H04L1/0057 ,  H04L1/0618

摘要： A method codes multiple data streams in multiple-input, multiple-output communications systems. In a transmitter, an input bitstream is encoded as codewords b in multiple layers. Each layer is modulated. A quasi-block diagonal, low-density parity-check code is applied to each layer, the quasi-block diagonal, parity-check code being a matrix H, the matrix H including one row of blocks for each subcode, and one row of blocks for each layer such that Hb=0 for any valid codeword. The layers are then forwarded to transmit antennas as a transmitted signal x.

摘要翻译： 一种方法在多输入多输出通信系统中对多个数据流进行编码。 在发射机中，输入比特流被编码为多层的码字b。 每层调制。 准块对角线，低密度奇偶校验码被应用于每个层，准块对角线，奇偶校验码是矩阵H，矩阵H包括每个子码的一行块，以及一行 每个层的块，使得对于任何有效的码字，Hb = 0。 然后将层转发到发射天线作为发射信号x。

公开(公告)号：US20050048940A1

公开(公告)日：2005-03-03

申请号：US10648558

申请日：2003-08-25

申请人： Jingxian Wu ,  Andreas Molisch ,  Jinyun Zhang

发明人： Jingxian Wu ,  Andreas Molisch ,  Jinyun Zhang

IPC分类号： H04B7/06 ,  H04L1/06 ,  H04B7/02

CPC分类号： H04L1/0693 ,  H04B7/0626 ,  H04B7/0658 ,  H04B7/0669 ,  H04L1/0618

摘要： A method increases transmit diversity gain in a wireless communication system. In the wireless network, a transmitter has multiple antennas and a receiver has one antenna. A phase of each of received signal is measured. One signal is selected as a reference signal. For each other signal, a phase, with respect to the phase of the reference signal, is measured independently to determine feedback information indicating a required rotation of each other signal so that a phase of each other rotated signal is within an identical quadrant as the phase of the reference signal. The feedback information for each other signal is sent to the transmitter. In the transmitter, each other signal is phase rotated according to the corresponding feedback information before the signal is transmitting to the receiver.

摘要翻译： 一种方法增加了无线通信系统中的发射分集增益。 在无线网络中，发射机具有多个天线，接收机具有一个天线。 测量每个接收信号的相位。 选择一个信号作为参考信号。 对于每个其他信号，相对于参考信号的相位的相位被独立地测量以确定指示每个其他信号的所需旋转的反馈信息，使得彼此旋转的信号的相位在与相位相同的象限内 的参考信号。 每个其他信号的反馈信息被发送到发射机。 在发射机中，在信号发送到接收机之前，根据对应的反馈信息，每个其他信号相位旋转。

公开(公告)号：US20070224943A1

公开(公告)日：2007-09-27

申请号：US11387252

申请日：2006-03-23

申请人： Daqing Gu ,  Andreas Molisch ,  Jinyun Zhang ,  Hongyuan Zhang ,  Dong Wang

发明人： Daqing Gu ,  Andreas Molisch ,  Jinyun Zhang ,  Hongyuan Zhang ,  Dong Wang

IPC分类号： H04B1/02 ,  H04B7/00 ,  H04M1/00

CPC分类号： H04B7/0874 ,  H04B7/061 ,  H04B7/0691 ,  H04L25/0242

摘要： A method for selecting antennas in a multiple-input, multiple-output wireless communications network that includes multiple stations is presented. Each station includes a set of transmit RF chains and a set of receive RF chains, and each RF chain is connectable to a set of antennas. A first station transmits a training frame for each possible subset of the set of antennas, and the set of transmit RF chains are connected to the subset of antennas according to a connection mapping rule while transmitting each training frame. A subchannel matrix is estimated in a second station for each frame. The subchannel matrices are combined to obtain a complete channel matrix. A particular subset of the antennas is selected according to the complete channel matrix. The set of transmit RF chains is connected to the selected particular subset of antennas to transmit data from the first station to the second station.

摘要翻译： 提出了一种在包含多个站的多输入，多输出无线通信网络中选择天线的方法。 每个站包括一组发射RF链和一组接收RF链，并且每个RF链可连接到一组天线。 第一台站发送针对该组天线的每个可能子集的训练帧，并且该组发射RF链根据连接映射规则连接到天线子集，同时传输每个训练帧。 在每个帧的第二站中估计子信道矩阵。 子信道矩阵被组合以获得完整的信道矩阵。 根据完整的信道矩阵来选择天线的特定子集。 发射RF链的集合被连接到所选择的特定天线子集，以将数据从第一站传送到第二站。

公开(公告)号：US07103326B2

公开(公告)日：2006-09-05

申请号：US10648558

申请日：2003-08-25

申请人： Jingxian Wu ,  Andreas Molisch ,  Jinyun Zhang

发明人： Jingxian Wu ,  Andreas Molisch ,  Jinyun Zhang

IPC分类号： H03C7/02 ,  H04B1/02 ,  H04B7/02

CPC分类号： H04L1/0693 ,  H04B7/0626 ,  H04B7/0658 ,  H04B7/0669 ,  H04L1/0618

摘要： A method increases transmit diversity gain in a wireless communication system. In the wireless network, a transmitter has multiple antennas and a receiver has one antenna. A phase of each of received signal is measured. One signal is selected as a reference signal. For each other signal, a phase, with respect to the phase of the reference signal, is measured independently to determine feedback information indicating a required rotation of each other signal so that a phase of each other rotated signal is within an identical quadrant as the phase of the reference signal. The feedback information for each other signal is sent to the transmitter. In the transmitter, each other signal is phase rotated according to the corresponding feedback information before the signal is transmitting to the receiver.

摘要翻译： 一种方法增加了无线通信系统中的发射分集增益。 在无线网络中，发射机具有多个天线，接收机具有一个天线。 测量每个接收信号的相位。 选择一个信号作为参考信号。 对于每个其他信号，相对于参考信号的相位的相位被独立地测量以确定指示每个其他信号的所需旋转的反馈信息，使得彼此旋转的信号的相位在与相位相同的象限内 的参考信号。 每个其他信号的反馈信息被发送到发射机。 在发射机中，在信号发送到接收机之前，根据对应的反馈信息，每个其他信号相位旋转。

公开(公告)号：US07382840B2

公开(公告)日：2008-06-03

申请号：US10629240

申请日：2003-07-29

申请人： Andreas Molisch ,  Sun Yuan Kung ,  Xinying Zhang ,  Jinyun Zhang

发明人： Andreas Molisch ,  Sun Yuan Kung ,  Xinying Zhang ,  Jinyun Zhang

IPC分类号： H04B7/10

CPC分类号： H04B7/0874 ,  H04B7/0691 ,  H04B7/0805 ,  H04B7/0857

摘要： A method for antenna subset selection by joint processing in RF and baseband in a multi-antenna systems. Lt input data streams are generated in a transmitter for either diversity transmission or multiplexing transmission. These streams are modulated to RF signals. These signals are switched to the t branches associated with the t transmit antennas, and a phase-shift transformation is applied to the RF signals by a t×t matrix multiplication operator Φ1, whose output are t≧Lt RF signals. These signals are transmitted over a channel by t antennas. The transmitted signals are received by r antennas in a receiver. A phase-shift transformation is applied to the r RF signals by a r×r matrix multiplication operator Φ2. Lr branches of these phase shifted streams are demodulated and further processed in baseband to recover the input data streams.

摘要翻译： 一种在多天线系统中通过RF和基带中的联合处理进行天线子集选择的方法。 在用于分集发送或复用传输的发射机中生成输入数据流。 这些流被调制成RF信号。 这些信号被切换到与t个发送天线相关联的t个分支，并且通过txt矩阵乘法运算符Phi1 <1>将RF移位变换应用于RF信号，其输出为t> = L RF信号。 这些信号通过t个天线在信道上传输。 所发送的信号由接收机中的r个天线接收。 通过rxr矩阵乘法运算符Phi <2>将相移变换应用于r RF信号。 这些相移流的L分支分支被解调并在基带中进一步处理以恢复输入数据流。