公开(公告)号：US08755813B2

公开(公告)日：2014-06-17

申请号：US13498106

申请日：2010-07-09

申请人： Jung Yee ,  Vajira Samarasooriya ,  Lingjie Li

发明人： Jung Yee ,  Vajira Samarasooriya ,  Lingjie Li

IPC分类号： H04W72/00

CPC分类号： G06F17/30289 ,  G06F17/30091 ,  G06F17/30345 ,  G06F17/30557 ,  H04W16/14 ,  H04W28/18 ,  H04W48/14

摘要： A two-level database structure for use by unlicensed TVBD devices operating in TV white space comprises a central database and local databases. The central database comprises two sub-database: the central licensed database which maintains information about all licensed TV devices and the central unlicensed database which maintains information about unlicensed wireless devices operating in TV spectrum. The local database is created by each TVBD device or TVBD network when it initiates and it stores information related to all transmitters in the local area including location, power transmission levels, operating schedule, sensing results, backup channel information. The local databases communicate with central database to query it about licensed usage of TV spectrum and register with central database. The local databases communicate with each other to exchange information about channel usage, sensing results, transmission patterns and other information that will allow the local databases to negotiate coexistence without central coordinator. The locally implemented negotiation prevents the overloading of the central database.

摘要翻译： 用于在TV空白中工作的未经许可的TVBD设备使用的两级数据库结构包括中央数据库和本地数据库。 中央数据库包括两个子数据库：中央许可数据库，其维护关于所有许可的电视设备的信息和中央非许可数据库，其维护关于在TV频谱中操作的未许可的无线设备的信息。 每个TVBD设备或TVBD网络创建本地数据库，并且存储与本地区域中的所有发射机有关的信息，包括位置，功率传输级别，操作时间表，感测结果，备份信道信息。 本地数据库与中央数据库进行通信，查询有关电视频谱的许可使用情况，并向中央数据库注册。 本地数据库相互通信以交换关于信道使用，感测结果，传输模式和其他信息的信息，这些信息将允许本地数据库在没有中央协调器的情况下协商共存。 本地实施的协商可以防止中央数据库的超载。

公开(公告)号：US08692891B2

公开(公告)日：2014-04-08

申请号：US13275006

申请日：2011-10-17

申请人： Lingjie Li ,  Jung Yee

发明人： Lingjie Li ,  Jung Yee

IPC分类号： H04N17/00 ,  H04N17/02 ,  H04N5/50 ,  H04W4/00 ,  G01R31/08 ,  G06F11/00 ,  G08C15/00 ,  H04J1/16 ,  H04J3/14 ,  H04L1/00 ,  H04L12/26

CPC分类号： H04N21/42202 ,  H04N5/50 ,  H04N21/25841 ,  H04N21/436

摘要： A TV band device for indoor applications uses information gleaned from a database inquiry based on geo-location information in combination with spectrum sensing to determine if TV channels are available for unlicensed use.

摘要翻译： 用于室内应用的电视频带设备使用基于地理位置信息的数据库查询收集的信息与频谱感测相结合，以确定电视频道是否可用于未许可使用。

公开(公告)号：US20120314818A1

公开(公告)日：2012-12-13

申请号：US13590608

申请日：2012-08-21

申请人： Lingjie Li ,  Shiquan Wu

发明人： Lingjie Li ,  Shiquan Wu

IPC分类号： H04L27/06

CPC分类号： H04L27/2671 ,  H04L27/0014 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2695 ,  H04L2027/003 ,  H04L2027/0067

摘要： A carrier frequency offset can be present in a signal received by a communications receiver, when the receiver has a local frequency oscillator that generates a carrier frequency different from a carrier frequency generated by a local frequency oscillator at a transmitter that transmitted the signal. A residual carrier frequency offset can remain after most of the carrier frequency offset has been removed from the received signal using conventional techniques. The residual carrier frequency offset is estimated using first and second channel impulse responses derived from first and second portions of the received signal. An estimated phase difference between the first and second channel impulse responses is computed. An estimate of the residual carrier frequency offset is computed using the estimated phase difference.

摘要翻译： 当接收机具有本地频率振荡器时，载波频率偏移可以存在于由通信接收机接收的信号中，本地频率振荡器产生与发射信号的发射机处的本地频率振荡器产生的载波频率不同的载波频率。 在使用常规技术从接收信号中去除了大部分载波频率偏移之后，剩余载波频率偏移量可以保持。 使用从接收信号的第一和第二部分导出的第一和第二信道脉冲响应来估计残余载波频率偏移。 计算第一和第二信道脉冲响应之间的估计相位差。 使用估计的相位差来计算残余载波频率偏移的估计。

公开(公告)号：US20120127936A1

公开(公告)日：2012-05-24

申请号：US13297656

申请日：2011-11-16

申请人： Lingjie Li ,  Michael L. Moher ,  Jung Yee

发明人： Lingjie Li ,  Michael L. Moher ,  Jung Yee

IPC分类号： H04W72/04

CPC分类号： H04L5/0007 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/0094

摘要： Methods and systems which include identifying a needed amount of US bandwidth to be allocated to a user terminal; determining the subcarriers and the number of symbols per subcarrier to be allocated to meet the identified need in a burst; allocating, for the user terminal, a set of subcarriers and a number of symbols for each member of the set of subcarriers, wherein sufficient symbols per subcarrier per burst are allocated to allow user terminal to send two or more pilots per subcarrier per burst; and transmitting a message to the user terminal, the message identifying the allocated subcarriers and the number of symbols allocated for each subcarrier.

摘要翻译： 包括识别要分配给用户终端的US带宽所需数量的方法和系统; 确定要在分组中满足所识别的需要的每个副载波的子载波和符号的数量; 为用户终端分配一组子载波和每个子载波组的每个成员的符号数，其中每个突发的每个子载波的足够符号被分配以允许用户终端每个突发发送两个或更多个每个子载波的导频; 以及向用户终端发送消息，识别所分配的子载波的消息和为每个子载波分配的符号数。

公开(公告)号：US08928759B2

公开(公告)日：2015-01-06

申请号：US13489078

申请日：2012-06-05

申请人： Lingjie Li ,  Jung Yee

发明人： Lingjie Li ,  Jung Yee

IPC分类号： H04N17/00 ,  H04N17/02 ,  H04N5/50 ,  H04W4/00 ,  H04B17/00 ,  H04W16/14 ,  H04W64/00

CPC分类号： H04W16/14 ,  H04W64/00

摘要： A cognitive radio band device uses information gleaned from a database inquiry based on geo-location information in combination with spectrum sensing to determine if cognitive radio channels are available for unlicensed use.

摘要翻译： 认知无线电频段设备使用基于地理位置信息的数据库查询收集的信息与频谱感测相结合，以确定认知无线电信道是否可用于未经许可的使用。

公开(公告)号：US08675586B2

公开(公告)日：2014-03-18

申请号：US13297656

申请日：2011-11-16

申请人： Lingjie Li ,  Michael L. Moher ,  Jung Yee

发明人： Lingjie Li ,  Michael L. Moher ,  Jung Yee

IPC分类号： H04W4/00

CPC分类号： H04L5/0007 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/0094

摘要： Methods and systems for operating a base station communicating with one or more user terminals in an orthogonal frequency division multiple access (OFDMA) system where the one or more user terminals are configured to insert pilots in up stream bursts every nth symbol on each subcarrier, where n is an integer, are provided. The method includes identifying a needed amount of up stream bandwidth to be allocated to a user terminal; determining the subcarriers and the number of symbols per subcarrier to be allocated to meet the identified need in a burst; allocating, for the user terminal, a set of subcarriers and a number of symbols for each member of the set of subcarriers, wherein sufficient symbols per subcarrier per burst are allocated to allow user terminal to send two or more pilots per subcarrier per burst; and transmitting a message to the user terminal, the message identifying the allocated subcarriers and the number of symbols allocated for each subcarrier.

摘要翻译： 用于在正交频分多址（OFDMA）系统中操作与一个或多个用户终端通信的基站的方法和系统，其中一个或多个用户终端被配置为在每个子载波上每第n个符号的上行脉冲串中插入导频，其中 n是整数。 该方法包括：识别要分配给用户终端的上行带宽所需的量; 确定要在分组中满足所识别的需要的每个副载波的子载波和符号的数量; 为用户终端分配一组子载波和每个子载波组的每个成员的符号数，其中每个突发的每个子载波的足够符号被分配以允许用户终端每个突发发送两个或更多个每个子载波的导频; 以及向所述用户终端发送消息，所述消息标识所分配的副载波和为每个副载波分配的符号数。

公开(公告)号：US20110116562A1

公开(公告)日：2011-05-19

申请号：US12621331

申请日：2009-11-18

申请人： Lingjie Li ,  Shiquan Wu

发明人： Lingjie Li ,  Shiquan Wu

IPC分类号： H04L27/28 ,  H04L27/00

CPC分类号： H04L27/2671 ,  H04L27/0014 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2695 ,  H04L2027/003 ,  H04L2027/0067

摘要： A residual carrier frequency offset of a signal received by a receiver, which has a local frequency oscillator that generates a carrier frequency different from a carrier frequency generated by a local frequency oscillator at a transmitter that transmitted the received signal is estimated using first and second channel impulse responses derived from first and second portions of the received signal, an estimated phase difference between the first and second channel impulse responses, and an estimate of the residual carrier frequency offset computed using the estimated phase differences. The residual carrier frequency offset is estimated after most of the carrier frequency offset has been removed from the received signal using conventional means.

摘要翻译： 由发送接收信号的发射机产生与本地频率振荡器产生的载波频率不同的载波频率的接收机接收的信号的残余载波频率偏移是使用第一和第二信道 从接收信号的第一和第二部分导出的脉冲响应，第一和第二信道脉冲响应之间的估计相位差以及使用估计的相位差计算出的残余载波频率偏移的估计。 在使用常规方法从接收信号中去除了大部分载波频率偏移之后，估计残余载波频率偏移。

公开(公告)号：US20130165051A9

公开(公告)日：2013-06-27

申请号：US13489078

申请日：2012-06-05

申请人： Lingjie Li ,  Jung Yee

发明人： Lingjie Li ,  Jung Yee

IPC分类号： H04B17/00

CPC分类号： H04W16/14 ,  H04W64/00

摘要： A cognitive radio band device uses information gleaned from a database inquiry based on geo-location information in combination with spectrum sensing to determine if cognitive radio channels are available for unlicensed use.

摘要翻译： 认知无线电频段设备使用基于地理位置信息的数据库查询收集的信息与频谱感测相结合，以确定认知无线电信道是否可用于未经许可的使用。

公开(公告)号：US20110051862A1

公开(公告)日：2011-03-03

申请号：US12551980

申请日：2009-09-01

申请人： Lingjie Li ,  Shiquan Wu

发明人： Lingjie Li ,  Shiquan Wu

IPC分类号： H04L27/06

CPC分类号： H04L27/2665 ,  H04L27/2607 ,  H04L27/2663 ,  H04L27/2678 ,  H04L27/2688

摘要： A received signal comprises a continuous sequence of symbols φ1, φ2, . . . φn, each represented by a sequence of samples X0, X2, . . . Xn−1, and wherein the symbols have a guard period GP of duration Tgp at the beginning thereof. Each guard period contains a cyclic prefix with the same subsequence of samples as a tail end portion of the associated symbol. The symbols are identified by delaying the received signal by a fixed number of samples, computing the correlation of the received signal with the delayed signal, computing the summation of said correlation over a window of duration Ti, wherein Ti>Tgp, and sliding the window over the correlation to find a characteristic point or region. The start of each symbol for further processing is selected from the characteristic point or region. By increasing the duration of the window, more robust performance can be achieved, especially in multipath conditions.

摘要翻译： 接收到的信号包括连续的符号序列＆phgr; 1，＆phgr; 2，。 。 。 每个由样本X0，X2，...的序列表示。 。 。 Xn-1，并且其中符号在其开始处具有持续时间Tgp的保护周期GP。 每个保护周期包含循环前缀，其具有与相关联的符号的尾端部分相同的样本子序列。 通过将接收到的信号延迟固定数量的样本来识别符号，计算接收信号与延迟信号的相关性，计算持续时间Ti的窗口上的所述相关性的总和，其中Ti> Tgp，并且滑动窗口 在相关性上找到特征点或区域。 从特征点或区域中选择用于进一步处理的每个符号的开始。 通过增加窗口的持续时间，可以实现更强大的性能，特别是在多径条件下。

公开(公告)号：US08938251B2

公开(公告)日：2015-01-20

申请号：US13540292

申请日：2012-07-02

申请人： Lingjie Li ,  Jung Yee

发明人： Lingjie Li ,  Jung Yee

IPC分类号： H04W72/00 ,  H04W16/14

CPC分类号： H04W16/14

摘要： A frequency resource allocation system and method for a wireless network that comprises one or more unlicensed cognitive devices that operate using white spaces in a TV frequency spectrum and one or more licensed incumbent devices that are associated with an incumbent service that uses the TV frequency spectrum stores one or more frequency resource databases that store one or more frequency band lists. A frequency band list comprises one or more frequency bands within the TV frequency spectrum. Merit-related information specific to a location associated with the wireless network are collected to choose a specified frequency based on the merit-related information. The specified frequency band can be chosen based on a merit class derived from transforming the merit-related information into different merit classes, with each merit class being associated with one or more frequency bands. A resource user device is then notified to operate in the specified frequency band.

摘要翻译： 一种用于无线网络的频率资源分配系统和方法，其包括使用TV频谱中的空格操作的一个或多个未许可的认知设备和与使用TV频谱存储的现有服务相关联的一个或多个许可的现任设备 存储一个或多个频带列表的一个或多个频率资源数据库。 频带列表包括TV频谱内的一个或多个频带。 收集与无线网络相关的位置特定的优点相关信息，以根据与功能相关的信息选择指定的频率。 可以基于从功能相关信息转换为不同优值级别而导出的优值类别来选择指定的频带，每个品质类别与一个或多个频带相关联。 然后通知资源用户设备在指定的频带中操作。