公开(公告)号：US20130114765A1

公开(公告)日：2013-05-09

申请号：US13291546

申请日：2011-11-08

申请人： Ramesh Annavajjala ,  Liangbin Li ,  Philip Orlik

发明人： Ramesh Annavajjala ,  Liangbin Li ,  Philip Orlik

IPC分类号： H04L27/06

CPC分类号： H04L5/0048 ,  H04J11/004 ,  H04L25/03171 ,  H04L27/2602 ,  H04L27/32 ,  H04L2025/03777

摘要： Interference in a received orthogonal frequency division multiplexing (OFDM) symbol, modulated according to selected constellation points Sk, is reduced. The symbol includes a set of pilot signals and a set of data signals yk, where k is a number of consecutive subcarriers used for the pilot and the data signals. The pilot signals are thresholded to detect interfering pilot signals, which are then erased. Channels Ĥk are estimated using remaining pilot signals. The set of data signals are decoded based on the estimated channels Ĥk, and, for each bit bi in the set of data signals, a logarithmic likely ratio (LLR) log  ∑ s k : b i = 0  1  y k - H ^ k  s k  2 ∑ s k : b i = 1  1  y k - H ^ k  s k  2 is determined. The LLR is an indicator of the likely interference.

摘要翻译： 根据选择的星座点Sk进行调制的接收正交频分复用（OFDM）符号中的干扰被减少。 符号包括一组导频信号和一组数据信号yk，其中k是用于导频和数据信号的连续副载波的数量。 导频信号被阈值以检测干扰导频信号，然后擦除导频信号。 使用剩余的导频信号估计信道Hk。 基于估计的信道H k解码数据信号组，并且对于数据信号组中的每个比特bi，存在对数可能比率（LLR）logΣΣΣKi：k = 2Σsk：2 LLR是可能的干扰的指标。

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：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：US20100246635A1

公开(公告)日：2010-09-30

申请号：US12385078

申请日：2009-03-30

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： H04B1/69 ,  H04B1/10

CPC分类号： H04J11/0066 ,  H04B1/719

摘要： An exemplary method is disclosed to accurately estimate the center frequency of a narrow-band interference (NBI). The exemplary method uses multi-stage autocorrelation-function (ACF) to estimate an NBI frequency. The exemplary method allows an accurate estimation of the center frequency of NBI in an Ultra-Wideband system. A narrow band interference (NBI) estimator based on such a method allows a low complexity hardware implementation. The exemplary method estimates the frequency in multiple stages. Each stage performs an ACF operation on the received signals. The first stage gives an initial estimation and the following stages refine the estimation. The results of all stages are combined to produce the final estimation. An apparatus based on such a multi-stage narrow band interference frequency detector is also disclosed to improve the accuracy by combining various filters with the detector.

摘要翻译： 公开了一种用于精确估计窄带干扰（NBI）的中心频率的示例性方法。 该示例性方法使用多级自相关函数（ACF）来估计NBI频率。 该示例性方法允许在超宽带系统中准确估计NBI的中心频率。 基于这种方法的窄带干扰（NBI）估计器允许低复杂度的硬件实现。 该示例性方法以多个阶段估计频率。 每个级对所接收的信号执行ACF操作。 第一阶段给出初步估计，并且以下阶段改进估计。 结合所有阶段的结果进行最终估计。 还公开了一种基于这种多级窄带干扰频率检测器的装置，通过将各种滤波器与检测器组合来提高精度。

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：US20060209924A1

公开(公告)日：2006-09-21

申请号：US11029135

申请日：2005-01-04

申请人： Andreas Molisch ,  Philip Orlik

发明人： Andreas Molisch ,  Philip Orlik

IPC分类号： H04B1/00

CPC分类号： H04B1/71637 ,  H04B1/71635 ,  H04B1/7172 ,  H04B2201/71636

摘要： A method determines a delay time between reference and data pulses in a time-hopping impulse radio system. Channel state information of a channel between two transceivers is estimated periodically. The delay time frame between the reference and data pulses is then determined according to the channel state information.

公开(公告)号：US07016405B2

公开(公告)日：2006-03-21

申请号：US10075330

申请日：2002-02-14

申请人： Jyhchau Horng ,  Jinyun Zhang ,  Philip Orlik

发明人： Jyhchau Horng ,  Jinyun Zhang ,  Philip Orlik

IPC分类号： H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC分类号： H04L25/03133

摘要： A method and system for equalizing a signal transmitted via a channel of a communications system stores an input signal received via the channel in a main buffer. A training signal portion of the received input signal is stored in a circular buffer as a circulating training signal. A mean square error of the training signal is minimized while estimating the transmitted signal, until the mean square error is less than a predetermine threshold. In this case, the input signal received via the channel is equalized directly to make decisions on symbols of the signal transmitted via the channel. During an initial stage of training, the mean square error is determined directly from the training signal, during subsequent stages of training the circulating training signal is used.

公开(公告)号：US20130308700A1

公开(公告)日：2013-11-21

申请号：US13475350

申请日：2012-05-18

申请人： Toshiaki Koike-Akino ,  Jesper H. Soerensen ,  Philip Orlik

发明人： Toshiaki Koike-Akino ,  Jesper H. Soerensen ,  Philip Orlik

IPC分类号： H04N7/26

CPC分类号： H04N19/164 ,  H03M13/373 ,  H03M13/3761

摘要： A method and system use capacity-approaching rateless code to communicate multimedia data even with very short codewords, such as 64 bits or less, via erasure and noise channels. The method provides a way to design the edge degree distribution of rateless codes for any arbitrary channel. Based on an equivalent metric of decoding behavior in any channels, the degree distribution of a rateless code such as Luby-transform codes and raptor codes is optimized based on in-process status of decoding. A regularized least-squares optimization is used to avoid erroneous decoding. Multiple feedbacks can further improve the performance.

摘要翻译： 一种方法和系统使用容量接近的无码代码即使通过擦除和噪声信道的诸如64位或更少的非常短的码字来传送多媒体数据。 该方法提供了一种设计任意任意通道的无码代码边缘度分布的方法。 基于任何通道中的解码行为的等效度量，基于解码的进程内状态来优化诸如Luby变换代码和猛禽代码之类的无码代码的度分布。 使用正则化的最小二乘优化来避免错误的解码。 多个反馈可以进一步提高性能。

公开(公告)号：US20130259014A1

公开(公告)日：2013-10-03

申请号：US13436047

申请日：2012-03-30

申请人： Philip Orlik ,  Ke Xu

发明人： Philip Orlik ,  Ke Xu

IPC分类号： H04W72/12

CPC分类号： H04W72/1252 ,  H04L47/11 ,  H04L47/14 ,  H04L47/24 ,  H04L47/32 ,  H04W72/1273

摘要： Packets are transmitted by a server to mobile nodes in a coverage area of a wireless network using a coverage and reliability map, which indicates qualities and reliabilities of links between the server and the nodes. When a new packet is received in the server, the server transmits the packet if a current load of the packets including the new packet is less than a peak load constraint. Otherwise, the new packet is delayed for one time slot.

摘要翻译： 数据包由服务器传输到无线网络的覆盖区域中的移动节点，使用覆盖和可靠性映射表，指示服务器和节点之间链路的质量和可靠性。 当在服务器中接收到新的分组时，如果包括新分组的分组的当前负载小于峰值负载约束，则服务器发送分组。 否则，新数据包将延迟一个时隙。

公开(公告)号：US20130208583A1

公开(公告)日：2013-08-15

申请号：US13371423

申请日：2012-02-11

申请人： Jianlin Guo ,  Chuan Han ,  Ghulam M. Bhatti ,  Philip Orlik ,  Jinyun Zhang

发明人： Jianlin Guo ,  Chuan Han ,  Ghulam M. Bhatti ,  Philip Orlik ,  Jinyun Zhang

IPC分类号： H04L12/24 ,  H04L12/26

CPC分类号： H04W40/22 ,  H04L45/18 ,  H04L45/28 ,  H04L45/48 ,  Y02D70/122 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/162 ,  Y02D70/22 ,  Y02D70/39

摘要： Broken links in a sensor network are avoided by representing the network as a DODAG. A rank associated with each node defines a position of each node relative to other nodes, and the rank is in a form of a proper fraction, and the rank of each node never increases to enable loop-free routing.

摘要翻译： 通过将网络表示为DODAG来避免传感器网络中的链路断开。 与每个节点相关联的等级定义每个节点相对于其他节点的位置，并且秩是适当分数的形式，并且每个节点的等级从不增加以实现无环路由。