公开(公告)号：US20070127410A1

公开(公告)日：2007-06-07

申请号：US11295320

申请日：2005-12-06

申请人： Jianlin Guo ,  Jinyun Zhang

发明人： Jianlin Guo ,  Jinyun Zhang

IPC分类号： H04Q7/00

CPC分类号： H04W28/24 ,  H04L69/324

摘要： A method manages dynamically bandwidth for transport streams in a wireless network. An available bandwidth is defined for the network. An instantaneous bandwidth required by transport streams transmitted according to a hybrid coordination function controlled channel access (HCCA) category and an enhanced distributed channel access (EDCA) category is determined. The available bandwidth is compared to the instantaneous bandwidth, and the bandwidth of low priority transport streams is adjusted dynamically if the instantaneous bandwidth is different than the available bandwidth.

摘要翻译： 一种方法管理无线网络中传输流的动态带宽。 为网络定义可用带宽。 确定根据混合协调功能控制信道接入（HCCA）类别和增强分布式信道接入（EDCA）类别传输的传输流所需的瞬时带宽。 可用带宽与瞬时带宽进行比较，如果瞬时带宽与可用带宽不同，则可以动态调整低优先级传输流的带宽。

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。

公开(公告)号：US08369379B2

公开(公告)日：2013-02-05

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： H04B1/7156 ,  H04L27/28 ,  H04J4/00

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.

公开(公告)号：US08238868B2

公开(公告)日：2012-08-07

申请号：US11755903

申请日：2007-05-31

申请人： Chunjie Duan ,  Sinan Gezici ,  Jinyun Zhang ,  Rajesh Garg

发明人： Chunjie Duan ,  Sinan Gezici ,  Jinyun Zhang ,  Rajesh Garg

IPC分类号： H04B1/16 ,  H04B1/04 ,  H04B7/00 ,  H04B1/38 ,  H04B7/212 ,  G05F1/577 ,  G05F1/38 ,  G05F3/02 ,  B23K11/24 ,  H03L5/00 ,  H03K5/08 ,  H03G3/20 ,  H03G3/10 ,  G08B5/22 ,  H04Q1/30 ,  G08C17/00 ,  H04L5/16 ,  H04L27/06

CPC分类号： H04B1/1607 ,  G01R33/0029 ,  G01R33/072 ,  H04B1/40 ,  H04W52/0216 ,  H04W52/0232 ,  Y02D70/12 ,  Y02D70/142 ,  Y02D70/40

摘要： A dynamic voltage scaling system for a packet-based data communication transceiver includes a constant voltage supply, a variable voltage supply, and a voltage control unit. The constant voltage supply is configured to supply a constant voltage to at least one parameter-independent function of the transceiver, and the variable voltage supply is configured to supply a variable voltage in accordance with a control signal to at least one parameter-dependent function of the transceiver. Parameter-independent transceiver functions perform operations independent of a predetermined parameter and parameter-dependent transceiver functions perform operations dependent on the predetermined parameter The voltage control unit is configured to generate the control signal based on information provided by at least one parameter-independent transceiver function about the predetermined parameter.

摘要翻译： 用于基于分组的数据通信收发器的动态电压缩放系统包括恒定电压源，可变电压源和电压控制单元。 恒压源被配置为向收发器的至少一个独立于参数的功能提供恒定电压，并且可变电压源被配置为根据控制信号将可变电压提供给至少一个参数相关函数 收发器。 独立于参数的收发机功能执行独立于预定参数的操作，并且参数相关收发器功能执行取决于预定参数的操作。电压控制单元被配置为基于由至少一个与参数无关的收发器功能提供的信息来生成控制信号 预定参数。

公开(公告)号：US20120170684A1

公开(公告)日：2012-07-05

申请号：US12982636

申请日：2010-12-30

申请人： Raymond Yim ,  Amitav Mukherjee ,  Philip V. Orlik ,  Chunjie Duan ,  Jinyun Zhang

发明人： Raymond Yim ,  Amitav Mukherjee ,  Philip V. Orlik ,  Chunjie Duan ,  Jinyun Zhang

IPC分类号： H04B1/06

CPC分类号： H04L25/0204 ,  H04L25/0228 ,  H04L25/03159

摘要： A method estimates a wireless channel at a receiver. The signal is transmitted using narrowband orthogonal frequency division demultiplexing (OFDM) and frequency subcarriers, and the signal includes a set of data tones and a set of pilot tones. The channel and pilot tone interference are estimated based on all the pilot tones extracted from the signal and a channel model. The set of data are equalized based on the channel estimate. Data interference is detected according to the pilot interference and the equalized data tones. Subcarrier interference-to-noise ratios are determined based on the data interference. Signal strengths of the data tones are determined based on the equalized data tones, log-likelihood ratios of bits represented by the data tones are determined based on the subcarrier interference-to-noise ratios and the signal strength of the data tones.

摘要翻译： 一种方法估计接收机处的无线信道。 该信号使用窄带正交频分解复用（OFDM）和频率副载波来发送，并且该信号包括一组数据音调和一组导频音。 基于从信号提取的所有导频音和信道模型来估计信道和导频音干扰。 该数据集合基于信道估计来均衡。 根据导频干扰和均衡数据音调检测数据干扰。 基于数据干扰确定子载波干扰噪声比。 基于均衡的数据音调确定数据音调的信号强度，基于副载波干扰信噪比和数据音调的信号强度来确定由数据音调表示的比特的对数似然比。

公开(公告)号：US08139668B2

公开(公告)日：2012-03-20

申请号：US12503465

申请日：2009-07-15

申请人： Philip V. Orlik ,  Lu Zhang ,  Raymond Yim ,  Jinyun Zhang

发明人： Philip V. Orlik ,  Lu Zhang ,  Raymond Yim ,  Jinyun Zhang

IPC分类号： H04L5/12 ,  H04B7/02 ,  H03C7/02

CPC分类号： H04L1/065 ,  H04L1/0003 ,  H04L25/0212 ,  H04L25/0226

摘要： A transmitter encodes an input bitstream using space-time trellis coding (STTC). The encoder includes a serial to parallel convertor to produce a first and second output bitstreams. First and second three bit shift registers are connected to produce first and second output bitstreams. A multiplier applies a code generating weight to each bit of the shift registers to encode the bitstreams. A first switch is connected between a last bit of the first shift register and a first bit of the second shift register. A second switch is connected between the second output and the first bit of the second shift register. The first set of encoded bit streams and the second set of encoded bitstreams are combined and mapped to a frequency domain.

摘要翻译： 发射机使用空时网格编码（STTC）对输入比特流进行编码。 编码器包括串行到并行转换器以产生第一和第二输出比特流。 连接第一和第二三位移位寄存器以产生第一和第二输出比特流。 乘法器将代码生成权重应用于移位寄存器的每个位以对比特流进行编码。 第一开关连接在第一移位寄存器的最后位和第二移位寄存器的第一位之间。 第二开关连接在第二输出端和第二移位寄存器的第一位之间。 第一组编码比特流和第二组编码比特流被组合并映射到频域。

公开(公告)号：US08023915B2

公开(公告)日：2011-09-20

申请号：US12413868

申请日：2009-03-30

申请人： Philip V. Orlik ,  Raymond Yim ,  Ramesh Annavajjala ,  Jinyun Zhang

发明人： Philip V. Orlik ,  Raymond Yim ,  Ramesh Annavajjala ,  Jinyun Zhang

IPC分类号： H04B1/06 ,  H04B7/00

CPC分类号： H04B7/0617 ,  H04B7/086

摘要： Beams are used to communicate in a wireless network including mobile and stationary receivers. The network operates according to the IEEE 802.11p in wireless access to vehicular environments (WAVE). A direction from the mobile transceiver to the stationary receiver is predicted using geographic information available to the mobile transceiver. A set of signals are received in the mobile transceiver from the stationary transceiver, wherein the signals are received by an array of antennas, and wherein the signals are received using a set of beams, and wherein each beam is approximately directed at the stationary receiver. A signal-to-noise ratio (SNR) is measured for each beam, and the beam with an optimal SNR is selected as an optimal beam for communicating data between the mobile transceiver and the stationary transceiver.

摘要翻译： 光束用于在包括移动和固定接收机的无线网络中进行通信。 该网络根据IEEE 802.11p在无线接入车辆环境（WAVE）中运行。 使用可用于移动收发机的地理信息来预测从移动收发机到固定接收机的方向。 在固定收发器中的移动收发器中接收一组信号，其中信号由天线阵列接收，并且其中使用一组波束接收信号，并且其中每个波束近似地指向固定接收机。 测量每个波束的信噪比（SNR），并且选择具有最佳SNR的波束作为用于在移动收发器和固定收发器之间传送数据的最佳波束。

公开(公告)号：US20110194452A1

公开(公告)日：2011-08-11

申请号：US13092562

申请日：2011-04-22

申请人： Philip Orlik ,  Raymond Yim ,  Chunjie Duan ,  Jinyun Zhang

发明人： Philip Orlik ,  Raymond Yim ,  Chunjie Duan ,  Jinyun Zhang

IPC分类号： H04L12/26 ,  H04L12/56

CPC分类号： H04N19/615 ,  H04N19/105 ,  H04N19/13 ,  H04N19/46 ,  H04N19/597 ,  H04N19/61 ,  H04N19/63

摘要： A transmitter transmits data having a set of two or more priorities on subcarriers using orthogonal frequency division multiplexing (OFDM) symbols. The transmitter includes a media access (MAC) layer, wherein the MAC layer further includes a queue for storing data at each priority, a rate control block connected to each queue, and a physical (PHY) layer. The PHY layer further includes a channel coder for each priority, wherein each channel coder is connected to the corresponding queue to receive data, and to the rate control block to send coding information.

摘要翻译： 发射机使用正交频分复用（OFDM）符号在子载波上发射具有两个或更多个优先级集合的数据。 所述发射机包括媒体接入（MAC）层，其中所述MAC层还包括用于存储每个优先级的数据的队列，连接到每个队列的速率控制块以及物理（PHY）层。 PHY层还包括用于每个优先级的信道编码器，其中每个信道编码器连接到对应的队列以接收数据，并且连接到速率控制块以发送编码信息。

公开(公告)号：US20110116389A1

公开(公告)日：2011-05-19

申请号：US12618235

申请日：2009-11-13

申请人： Zhifeng Tao ,  Di Wang ,  Jinyun Zhang

发明人： Zhifeng Tao ,  Di Wang ,  Jinyun Zhang

IPC分类号： H04L12/26

CPC分类号： H04W40/22 ,  H04L45/18 ,  H04W40/125 ,  H04W40/248

摘要： Embodiments of the invention disclose a system and a method for determining a rank of a node in a multi-hop wireless network, wherein the network includes a gateway node, client nodes, and relay nodes, wherein a node p(i) is a default parent of the node i having a rank, and the network uses a directed acyclic graph (DAG) topology. The method comprises steps of transmitting at least one data packet from the node to the default parent node over a wireless link; counting a number of successful transmissions of most recent transmissions of data packets; determining an expected transmission time (ETX) for the wireless link based on the number of successful transmissions in the most recent transmissions; and assigning a rank R(i) to the node based on the rank of the parent node and the ETX.

摘要翻译： 本发明的实施例公开了一种用于确定多跳无线网络中的节点的等级的系统和方法，其中所述网络包括网关节点，客户端节点和中继节点，其中节点p（i）是默认的 具有等级的节点的父节点，并且网络使用有向非循环图（DAG）拓扑。 该方法包括以下步骤：通过无线链路将来自节点的至少一个数据分组发送到默认父节点; 计数数据分组的最近传输的成功传输的数量; 基于最近传输中成功传输的数量确定无线链路的预期传输时间（ETX）; 并且基于父节点和ETX的等级将节点R（i）分配给节点。

公开(公告)号：US20110074569A1

公开(公告)日：2011-03-31

申请号：US12571399

申请日：2009-09-30

申请人： Nayef Alsindi ,  Chunjie Duan ,  Jinyun Zhang

发明人： Nayef Alsindi ,  Chunjie Duan ,  Jinyun Zhang

IPC分类号： G08B1/08

CPC分类号： G01S5/0289

摘要： A wireless sensor network includes an initial set of anchors at known locations, and a set of sensors at unknown locations. Ranges, from each sensor to at least three of the anchors, determine a position, an anchor ranging weight, and an anchor position weight. For each anchor, the anchor ranging weight and the anchor position weight form a combined weight. A weighted least square (WLS) function for the positions and the combined weights is minimized to determine a position of the sensor, and a sensor position weight. The sensor is identified as being a member of a set of candidate anchor nodes, and the candidate anchor node with a largest sensor position weight is selected to be transformed to another anchor to minimize propagation of errors in the positions of the set of sensors.

摘要翻译： 无线传感器网络包括在已知位置处的初始锚点集合，以及在未知位置处的一组传感器。 从每个传感器到至少三个锚的范围确定位置，锚定测距重量和锚定位置重量。 对于每个锚，锚定距离权重和锚位置权重形成组合重量。 用于位置和组合权重的加权最小二乘（WLS）功能被最小化以确定传感器的位置和传感器位置权重。 传感器被识别为一组候选锚节点的成员，并且选择具有最大传感器位置权重的候选锚节点以被变换到另一个锚点，以最小化传感器组中位置误差的传播。