公开(公告)号：US07092436B2

公开(公告)日：2006-08-15

申请号：US10057179

申请日：2002-01-25

申请人： Xiaoqiang Ma ,  Hisashi Kobayashi ,  Stuart C. Schwartz ,  Daqing Gu ,  Jinyun Zhang

发明人： Xiaoqiang Ma ,  Hisashi Kobayashi ,  Stuart C. Schwartz ,  Daqing Gu ,  Jinyun Zhang

IPC分类号： H03H7/30 ,  H03H7/40

CPC分类号： H04L25/0242 ,  H04L25/0204 ,  H04L25/0224 ,  H04L27/2647

摘要： A system and method detect symbols of a modulated signal received via a plurality of channels of a wireless communications system. A symbol transmitted via the channels is initially estimated based on the channel estimate from either pilot symbol or previously estimated symbol, and then channel estimate is updated. The next estimate of the symbol is computed by using updated channel information and maximizing the expectation of the log likelihood function. The next estimate is then quantized according to the signal constellation. The quantized estimate of the symbol is compared with the previous estimate of the symbol to determine if the previous estimate of the symbol and the quantized next estimate of the symbol have converged. Otherwise, the quantized next estimate of the symbol is made as the input for the next iteration, and the updating, optimizing, quantizing, and comparing are repeated until the estimate converges.

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。

公开(公告)号：US07562279B2

公开(公告)日：2009-07-14

申请号：US11134545

申请日：2005-05-20

申请人： Juntan Zhang ,  Daqing Gu ,  Jinyun Zhang

发明人： Juntan Zhang ,  Daqing Gu ,  Jinyun Zhang

IPC分类号： H03M13/00

CPC分类号： H03M13/658 ,  H03M13/1117 ,  H03M13/112 ,  H03M13/1194 ,  H03M13/1197 ,  H03M13/6583

摘要： A method for decoding error-correcting codes normalizes messages generated by a bit node processor, and normalizes messages generated by the check node processor.

摘要翻译： 用于解码纠错码的方法对由比特节点处理器产生的消息进行归一化，并对由校验节点处理器产生的消息进行归一化。

公开(公告)号：US20080247370A1

公开(公告)日：2008-10-09

申请号：US12088285

申请日：2005-09-30

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： H04Q7/24

CPC分类号： H04B7/0691 ,  H04B7/024 ,  H04B7/0695 ,  H04B7/0851 ,  H04B7/0874 ,  H04B7/088

摘要： A computer implemented method selects antennas in a multiple-input, multiple-output wireless local area network that includes multiple stations, and each station includes a set of antennas. Multiple consecutively transmitted sounding packets are received in a station. Each sounding packet corresponds to a different subset of the set of antennas. A channel matrix is estimated from the multiple consecutively transmitted sounding packets, and a subset of antennas is selected according to the channel matrix.

摘要翻译： 计算机实现的方法选择包括多个站的多输入多输出无线局域网中的天线，并且每个站包括一组天线。 在站中接收到多个连续发送的探测包。 每个探测包对应于该组天线的不同子集。 从多个连续发送的探测分组估计信道矩阵，并根据信道矩阵选择天线子集。

公开(公告)号：US07385976B2

公开(公告)日：2008-06-10

申请号：US10917053

申请日：2004-08-12

申请人： Daqing Gu ,  Zhifeng Tao ,  Jinyun Zhang

发明人： Daqing Gu ,  Zhifeng Tao ,  Jinyun Zhang

IPC分类号： H04L12/56 ,  H04Q7/24

CPC分类号： H04L1/165 ,  H04L1/1628 ,  H04L1/1671

摘要： A method selectively acknowledges data packets in a network including a multiple stations connected by a common wireless channel. A transmitting station requests a block acknowledgement from a receiving station. The transmitting station transmits a block of data packets to the receiving station. The receiving station determines a number of successfully received data packets and a number of incorrectly received packets. Then, the receiving station selectively acknowledges only the successfully received data packets if the number of usefully received data packets is less than the number of incorrectly received data packets, and otherwise acknowledging only the incorrectly received packets.

摘要翻译： 一种方法选择性地确认包括通过公共无线信道连接的多个站的网络中的数据分组。 发送站请求来自接收站的块确认。 发送站向接收站发送数据分组块。 接收站确定成功接收的数据包的数量和一些不正确接收的包。 然后，如果有效接收的数据分组的数量小于错误接收的数据分组的数量，则接收站选择性地仅确认成功接收的数据分组，否则仅确认不正确接收的分组。

公开(公告)号：US20060034247A1

公开(公告)日：2006-02-16

申请号：US10917053

申请日：2004-08-12

申请人： Daqing Gu ,  Zhifeng Tao ,  Jinyun Zhang

发明人： Daqing Gu ,  Zhifeng Tao ,  Jinyun Zhang

IPC分类号： H04J3/24

CPC分类号： H04L1/165 ,  H04L1/1628 ,  H04L1/1671

摘要： A method selectively acknowledges data packets in a network including a multiple stations connected by a common wireless channel. A transmitting station requests a block acknowledgement from a receiving station. The transmitting station transmits a block of data packets to the receiving station. The receiving station determines a number of successfully received data packets and a number of incorrectly received packets. Then, the receiving station selectively acknowledges only the successfully received data packets if the number of usefully received data packets is less than the number of incorrectly received data packets, and otherwise acknowledging only the incorrectly received packets.

摘要翻译： 一种方法选择性地确认包括通过公共无线信道连接的多个站的网络中的数据分组。 发送站请求来自接收站的块确认。 发送站向接收站发送数据分组块。 接收站确定成功接收的数据包的数量和一些不正确接收的包。 然后，如果有效接收的数据分组的数量小于错误接收的数据分组的数量，则接收站选择性地仅确认成功接收的数据分组，否则仅确认不正确接收的分组。

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：US08284686B2

公开(公告)日：2012-10-09

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： H04W4/00

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。