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：US07359470B2

公开(公告)日：2008-04-15

申请号：US10939284

申请日：2004-09-10

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

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

IPC分类号： H04L7/02

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：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：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：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：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：US20090290563A1

公开(公告)日：2009-11-26

申请号：US12293458

申请日：2006-03-30

申请人： Daqing Gu ,  Hongyuan Zhang ,  Jinyun Zhang ,  Andreas F. Molisch

发明人： Daqing Gu ,  Hongyuan Zhang ,  Jinyun Zhang ,  Andreas F. Molisch

IPC分类号： H04W84/12 ,  H04B7/02

CPC分类号： H04B7/0691 ,  H04B7/0608 ,  H04B7/061 ,  H04B7/0626 ,  H04B7/0634 ,  H04B7/0636 ,  H04B7/0695 ,  H04B7/0874 ,  H04B7/088 ,  H04W84/12

摘要： A method selects antennas in a multiple-input, multiple-output (MIMO) wireless local area network (WLAN) that includes a plurality of stations, and each station includes a set of antennas. Plural consecutive packets, received at a station, include plural consecutive sounding packets. Each sounding packet corresponds to a different subset of the set of antennas, and at least one of the plural consecutive packets includes a high throughput (HT) control field including a signal to initiate antenna selection and a number N indicative of a number of sounding packets which follow the at least one packet including the HT control field and which are to be used for antenna selection. A channel matrix is estimated based on a characteristic of the channel as indicated by the received N sounding packets, and a subset of antennas is selected according to the channel matrix. Station and computer program product embodiments include similar features.

摘要翻译： 一种方法选择包括多个站的多输入多输出（MIMO）无线局域网（WLAN）中的天线，并且每个站包括一组天线。 在站处接收的多个连续分组包括多个连续的探测分组。 每个探测分组对应于该组天线的不同子集，并且多个连续分组中的至少一个分组包括高吞吐量（HT）控制字段，包括用于发起天线选择的信号和指示多个探测分组的数量N 其遵循至少一个包括HT控制字段并将用于天线选择的分组。 基于由接收的N个探测分组指示的信道的特性来估计信道矩阵，并且根据信道矩阵选择天线的子集。 站和计算机程序产品实施例包括类似的特征。

公开(公告)号：US07328026B2

公开(公告)日：2008-02-05

申请号：US10915801

申请日：2004-08-11

申请人： Daqing Gu ,  Zhifeng Tao ,  Jinyun Zhang

发明人： Daqing Gu ,  Zhifeng Tao ,  Jinyun Zhang

IPC分类号： H04Q7/20

CPC分类号： H04L47/824 ,  H04L47/14 ,  H04L47/15 ,  H04L47/70 ,  H04L47/72 ,  H04L47/765 ,  H04L47/788 ,  H04W28/20 ,  H04W74/04 ,  H04W74/0808 ,  H04W74/0866

摘要： A method signals data in a channel of a network including multiple stations and an access point connected by a wireless channel. A station first requests access to the channel using a sequential coordinated channel access method of an access point. After the station receives permission to access the channel during a contention free period at a time corresponding to a sequence index value received by the station from the access point, the station transmits a resource request message to the access point to obtain a bandwidth allocation. In response, the station receives the bandwidth allocation, and the station can then transmit data during the contention free period according to the bandwidth allocation.

摘要翻译： 一种方法是在包括多个站的网络的信道中的信号和由无线信道连接的接入点的信号。 首先，使用接入点的顺序协调信道接入方法请求接入信道。 在与站点从接入点接收到的序列索引值相对应的时间段内，在无竞争阶段期间接收到访问信道的许可之后，站向接入点发送资源请求消息以获得带宽分配。 作为响应，站接收带宽分配，然后站可以根据带宽分配在无竞争期间发送数据。

公开(公告)号：US20060009229A1

公开(公告)日：2006-01-12

申请号：US10888398

申请日：2004-07-10

申请人： Yuan Yuan ,  Daqing Gu ,  Jinyun Zhang

发明人： Yuan Yuan ,  Daqing Gu ,  Jinyun Zhang

IPC分类号： H04Q7/20

CPC分类号： H04W72/14 ,  H04W72/1236 ,  H04W74/04 ,  H04W74/08

摘要： A method provides access to a channel in a network including stations and an access point connected by a common wireless channel. A station makes a request to the access point to access to the channel to transmit a data stream. The access point assigns a sequence index value to the data stream. The sequence index value is broadcast by the access point. Then, the station transmits the data stream, during a contention free period, at a time corresponding to the sequence index value.

摘要翻译： 一种方法提供对包括站和通过公共无线信道连接的接入点的网络中的信道的访问。 站点向接入点发出请求以访问信道以发送数据流。 接入点将序列索引值分配给数据流。 序列索引值由接入点广播。 然后，站在无竞争期间，在与序列索引值对应的时间发送数据流。