公开(公告)号：US20090296684A1

公开(公告)日：2009-12-03

申请号：US12453685

申请日：2009-05-19

申请人： Zhenzhen Ye ,  Chunjie Duan ,  Philip Orlik ,  Jinyun Zhang

发明人： Zhenzhen Ye ,  Chunjie Duan ,  Philip Orlik ,  Jinyun Zhang

IPC分类号： H04J3/06 ,  H04K1/10

CPC分类号： H04J3/0608

摘要： Synchronization methods and systems for communications over a multi-band system are presented. A synchronization technique for communications over a multi-band system includes receiving a packet of preamble symbols respectively transmitted over a sequence of frequency sub-bands according to one of a plurality of frequency hopping patterns, wherein the plurality of frequency hopping patterns are partitioned into a plurality of disjoint groups, each group having a different associated periodicity; computing, in parallel, respective autocorrelation values of the packet received in a selected frequency sub-band at a plurality of symbol delays; and selecting one of the plurality of groups of frequency hopping patterns based on the autocorrelation values at the plurality of symbol delays.

摘要翻译： 介绍了多频段系统通信的同步方法和系统。 用于通过多频带系统进行通信的同步技术包括：接收根据多个跳频模式之一分别在一系列频率子带上传送的前导符号分组，其中多个跳频模式被划分为 多个不相交组，每组具有不同的相关周期; 并行地计算在多个符号延迟时在所选择的频率子带中接收的分组的相应自相关值; 以及基于所述多个符号延迟的所述自相关值来选择所述多个组跳频模式中的一个。

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：US20090245086A1

公开(公告)日：2009-10-01

申请号：US12112400

申请日：2008-04-30

申请人： Zhifeng Tao ,  Yu-Jung Chang ,  Jinyun Zhang

发明人： Zhifeng Tao ,  Yu-Jung Chang ,  Jinyun Zhang

IPC分类号： H04J11/00

CPC分类号： H04L5/0032 ,  H04L5/0037 ,  H04L5/0058

摘要： A method allocates radio channel resource in an orthogonal frequency-division multiple access network including a set of base stations (BS) and a set of mobile stations (MS). For each BS, a diversity set is maintained for the sets of MS. Each BS determines possible interference at the MS based on the diversity set. A graph is constructed, in which nodes represent the sets of MS, and each edge between a pair of nodes represents channel interference between the MS represented by the pair of nodes. A weight is assigned to each edge, which reflects interference and signal strength on the subchannel between the two MSs connected by the edge. Channel resources are allocated to the MS based on the graph.

摘要翻译： 一种方法在包括一组基站（BS）和一组移动站（MS）的正交频分多址网络中分配无线电信道资源。 对于每个BS，为MS集合保持分集集合。 每个BS基于分集集确定MS处的可能干扰。 构建图，其中节点表示MS集合，并且一对节点之间的每个边缘表示由该对节点表示的MS之间的信道干扰。 权重分配给每个边缘，其反映由边缘连接的两个MS之间的子信道上的干扰和信号强度。 信道资源根据图表分配给MS。

公开(公告)号：US20090220085A1

公开(公告)日：2009-09-03

申请号：US12204093

申请日：2008-09-04

申请人： Zhifeng Tao ,  Jinyun Zhang

发明人： Zhifeng Tao ,  Jinyun Zhang

IPC分类号： H04L9/00 ,  H04K1/00

CPC分类号： H04L63/0428 ,  H04L1/0075 ,  H04L63/0272 ,  H04W12/001 ,  H04W84/12

摘要： Provided is a data structure for transmitting a relay media access control (MAC) protocol data unit (PDU) between stations in a multi-hop relay network. The MAC PDU includes an encryption control bit, an allocation subheader bit, a grant management subheader bit, a fragmentation subheader bit, a packing subheader bit, a quality of service subheader bit, and an encryption key sequence. The relay MAC PDU is transmitted in a tunnel established between base station and relay station.

摘要翻译： 提供了一种用于在多跳中继网络中的站之间发送中继媒体接入控制（MAC）协议数据单元（PDU）的数据结构。 MAC PDU包括加密控制位，分配子头位，授权管理子头位，分段子头位，打包子头位，服务质量分头位和加密密钥序列。 中继MAC PDU在基站和中继站之间建立的隧道中进行传输。

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。

公开(公告)号：US20090074088A1

公开(公告)日：2009-03-19

申请号：US11854790

申请日：2007-09-13

申请人： Zhifeng Tao ,  Anfei Li ,  Koon Hoo Teo ,  Jinyun Zhang

发明人： Zhifeng Tao ,  Anfei Li ,  Koon Hoo Teo ,  Jinyun Zhang

IPC分类号： H04J11/00 ,  H03M13/03 ,  H04L27/28

CPC分类号： H04L1/1812 ,  H04L1/0007 ,  H04L27/2601

摘要： A method performs a hybrid automatic repeat-request (HARQ) operation in a wireless orthogonal frequency division multiple access (OFDMA) network. A quality of a channel between a transmitter and a receiver is estimated as an error metric. A packet for the HARQ operation is fragmented adaptively at the transmitter according to the estimated error metric. The fragmentation is performed at the HARQ layer when the error metric is less than a predetermined threshold, otherwise the fragmentation is performed at the MAC layer.

摘要翻译： 一种方法在无线正交频分多址（OFDMA）网络中执行混合自动重传请求（HARQ）操作。 发射机和接收机之间的信道的质量被估计为误差度量。 用于HARQ操作的分组根据估计的误差度量在发射机处被自适应地分段。 当错误度量小于预定阈值时，在HARQ层执行分段，否则在MAC层执行分段。

公开(公告)号：US20090016372A1

公开(公告)日：2009-01-15

申请号：US12117219

申请日：2008-05-08

申请人： Zhifeng Tao ,  Andreas F. Molisch ,  Philip V. Orlik ,  Jinyun Zhang ,  Shigeru Uchida ,  Kentarou Sawa

发明人： Zhifeng Tao ,  Andreas F. Molisch ,  Philip V. Orlik ,  Jinyun Zhang ,  Shigeru Uchida ,  Kentarou Sawa

IPC分类号： H04J3/16

CPC分类号： H04B7/0874 ,  H04B7/063 ,  H04B7/0691 ,  H04L5/0007

摘要： A method selects antennas in an OFDMA wireless network including a base station and a mobile station. The mobile station measures a channel state of a downlink in a downlink subframe using different subsets of available antennas, and selects a subset of receive antennas for downlink reception based on the channel states between the base station and the different subsets of antennas at the mobile station. The base station measures the channel state in an uplink using an uplink subframe received in the base station from the mobile station, and selects a subset of transmit antennas for mobile station's uplink transmission based on the channel states between the base station and different subset of antennas at the mobile station.

摘要翻译： 一种方法选择包括基站和移动台的OFDMA无线网络中的天线。 移动站使用不同的可用天线子集来测量下行链路子帧中的下行链路的信道状态，并且基于移动站的基站和不同的天线子集之间的信道状态来选择用于下行链路接收的接收天线的子集 。 基站使用来自移动站的基站中接收到的上行链路子帧来测量上行链路中的信道状态，并且基于基站和不同的天线子集之间的信道状态来选择用于移动台的上行链路传输的发射天线的子集 在移动台。

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。

公开(公告)号：US20080212513A1

公开(公告)日：2008-09-04

申请号：US11770327

申请日：2007-06-28

申请人： Zhifeng Tao ,  Jinyun Zhang

发明人： Zhifeng Tao ,  Jinyun Zhang

IPC分类号： H04J3/08

CPC分类号： H04L69/324 ,  H04L69/22 ,  H04W88/04

摘要： The invention provides a data structure embodied in a computer readable media. The data structure is a protocol data packet (PDU) communicated in a mobile multihop network between stations. The data structure includes a relay media access header, a payload and an optional cyclical redundancy checksum for the protocol data unit; and an indication whether the PDU is a relay media access protocol data unit or not.

摘要翻译： 本发明提供一种体现在计算机可读介质中的数据结构。 数据结构是在站之间的移动多跳网络中通信的协议数据分组（PDU）。 数据结构包括用于协议数据单元的中继媒体接入报头，有效载荷和可选的循环冗余校验和; 以及PDU是否为中继媒体接入协议数据单元的指示。

公开(公告)号：US20080166974A1

公开(公告)日：2008-07-10

申请号：US11620759

申请日：2007-01-08

申请人： Koon Hoo Teo ,  Hongyuan Zhang ,  Yves-Paul N. Nakache ,  Jinyun Zhang

发明人： Koon Hoo Teo ,  Hongyuan Zhang ,  Yves-Paul N. Nakache ,  Jinyun Zhang

IPC分类号： H04B17/00

CPC分类号： H04W72/046 ,  H04L5/0062 ,  H04L27/0006 ,  H04W16/28 ,  H04W24/00 ,  H04W72/085

摘要： A method detects unused frequency bands in a cognitive radio network. Multiple frequency bands for RF signals are sensed using an antenna array including a plurality of elements coupled to a receive RF chain, in which the plurality of elements are individually controllable. For each frequency band, multiple spatial directions are sensed for the RF signals using the antenna array. A particular frequency band and a particular direction and a particular time slot are assigned as an available frequency band, an available direction and a particular time slot for transmitting RF signals in a cognitive radio if the RF signals are not sensed in the particular spatial direction for the particular frequency band, and in which the RF signals are transmitted by a transmit chain connected to the antenna array.

摘要翻译： 一种方法检测认知无线电网络中的未使用频带。 使用包括耦合到接收RF链的多个元件的天线阵列感测用于RF信号的多个频带，其中多个元件可单独地控制。 对于每个频带，使用天线阵列检测RF信号的多个空间方向。 如果在特定空间方向上没有感测到RF信号，则将特定频带和特定方向以及特定时隙分配为可用频带，可用方向和用于在认知无线电中发送RF信号的特定时隙 特定频带，并且其中通过连接到天线阵列的发射链发射RF信号。