公开(公告)号：US08582536B2

公开(公告)日：2013-11-12

申请号：US12630130

申请日：2009-12-03

申请人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan

发明人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan

IPC分类号： H04W4/00

CPC分类号： H04B7/0626

摘要： Methods and apparatus for providing channel diversity to wireless terminals (WTs) in a manner that reduces the latency between the time a WT encounters satisfactory channel conditions are described. A plurality of communications channels with different physical characteristics are maintained in a cell by a base station (BS). Each WT monitors multiple channels and maintains multiple channel estimates at the same time so that rapid switching between channels is possible. Channel quality information is conveyed from each WT to the BS. The WT or BS selects a channel based on the measured channel quality. By supporting multiple channels and by introducing periodic variations into the channels in various embodiments, the time before a WT encounters a channel with good or acceptable channel conditions is minimized even if the WT does not change location. Multiple antennas are used at the BS to support numerous channels simultaneously, e.g., by controlling antenna patterns.

公开(公告)号：US08548515B2

公开(公告)日：2013-10-01

申请号：US13088210

申请日：2011-04-15

申请人： Samel Celebi ,  Charles Stanski ,  Sundeep Rangan

发明人： Samel Celebi ,  Charles Stanski ,  Sundeep Rangan

IPC分类号： H04Q7/20

CPC分类号： H04W52/50 ,  H04W52/10 ,  H04W52/146

摘要： Provided is an feedback mechanism to correct power control information in a broadcast signal that is determined to be incorrect by one or more devices that receive and rely on the broadcast information. A device that receives the incorrect broadcast information can determine a correction and to the information and provide a recommendation to tilt source of the broadcast information. The source can selectively determine whether to modify the broadcast information based on the recommendation from one or more devices. If the broadcast information is modified, subsequent devices that receive the broadcast information are provided with the modified information. If further changes are needed, the subsequent devices can provide further recommended changes.

摘要翻译： 提供了一种反馈机制，用于校正由接收并依赖于广播信息的一个或多个设备确定为不正确的广播信号中的功率控制信息。 接收不正确广播信息的设备可以确定对该信息的校正和提供倾斜广播信息源的建议。 源可以基于来自一个或多个设备的推荐来选择性地确定是否修改广播信息。 如果广播信息被修改，则接收广播信息的后续设备被提供修改的信息。 如果需要进一步的更改，后续设备可以提供进一步的建议更改。

公开(公告)号：US20120099435A1

公开(公告)日：2012-04-26

申请号：US13277124

申请日：2011-10-19

申请人： Yann Barbotin ,  Ali Hormati ,  Sundeep Rangan ,  Martin Vetterli

发明人： Yann Barbotin ,  Ali Hormati ,  Sundeep Rangan ,  Martin Vetterli

IPC分类号： H04L12/26

CPC分类号： H04L1/0631 ,  H04B1/7105 ,  H04B1/7113 ,  H04J11/0063 ,  H04L25/0204 ,  H04L27/2647

摘要： According to a first aspect of the present invention there is provided a method of estimating, jointly, a set of multipath channels having a common path support, the method comprising the steps of, estimating jointly the common path support of the set of multipath channels using a spectral estimation technique, estimating path amplitudes, for each channel in the set of multipath channels, using the estimation of the common path support, to obtain an estimate of the set of multipath channels.

摘要翻译： 根据本发明的第一方面，提供了一种共同估计具有公共路径支持的一组多路径信道的方法，所述方法包括以下步骤：使用以下步骤共同估计所述多路径信道集合的公共路径支持： 频谱估计技术，使用公共路径支持的估计来估计多径信道集合中的每个信道的路径振幅，以获得该多路径信道集合的估计。

公开(公告)号：US07869421B2

公开(公告)日：2011-01-11

申请号：US11486540

申请日：2006-07-14

申请人： Sundeep Rangan ,  Junyi Li

发明人： Sundeep Rangan ,  Junyi Li

IPC分类号： H04J3/08

CPC分类号： H04W56/0045 ,  H04L5/003 ,  H04L5/0078 ,  H04L5/0098

摘要： The claimed subject matter relates to acquiring channel access in a wireless communication environment. A wireless terminal may transmit first and second sets of tones over respective first and second contiguous transmission periods. The first and second tone sets may be disjoint from each other and may each comprise a number of contiguous tones. The terminal may then refrain from transmitting during a third time period in order to receive a grant signal from a base station in response to the access request. The beginnings of the first time period and the second time period may be a function of a determined uplink transmission time.

摘要翻译： 所要求保护的主题涉及在无线通信环境中获取信道接入。 无线终端可以在相应的第一和第二连续传输周期上传送第一和第二组音调。 第一和第二音调集可以彼此不相交，并且可以各自包括多个连续的音调。 然后终端可以在第三时间段期间避免发送，以便响应于接入请求从基站接收授权信号。 第一时间段和第二时间段的开始可以是确定的上行链路传输时间的函数。

公开(公告)号：US20100238901A1

公开(公告)日：2010-09-23

申请号：US12727155

申请日：2010-03-18

申请人： Ashwin Sampath ,  Sundeep Rangan ,  Raja Sekhar Bachu

发明人： Ashwin Sampath ,  Sundeep Rangan ,  Raja Sekhar Bachu

IPC分类号： H04W4/00 ,  H04B7/00

CPC分类号： H04W24/02 ,  H04W72/08 ,  H04W72/082 ,  H04W84/045

摘要： Systems, apparatus, methods and computer program products are provided. In some embodiments, a method for facilitating interference management in an unplanned wireless communication system is provided. The method can include a non-serving base station obtaining information about a user equipment served by a serving base station; and determining signal information based, at least, in part, on the information. The method can also include the non-serving base station disallowing access to the user equipment due to restricted access rules for the non-serving base station. The method can also include the non-serving base station performing interference management of the user equipment served by the serving base station. The interference management can be performed based, at least, in part, on the determined signal information.

摘要翻译： 提供系统，设备，方法和计算机程序产品。 在一些实施例中，提供了一种用于促进非计划无线通信系统中的干扰管理的方法。 该方法可以包括非服务基站获取关于由服务基站服务的用户设备的信息; 以及至少部分地基于所述信息来确定信号信息。 该方法还可以包括非服务基站由于非服务基站的受限访问规则而不允许对用户设备的访问。 该方法还可以包括非服务基站对由服务基站服务的用户设备进行干扰管理。 可以至少部分地基于确定的信号信息来执行干扰管理。

公开(公告)号：US20090248770A1

公开(公告)日：2009-10-01

申请号：US12412340

申请日：2009-03-26

申请人： Siddharth Ray ,  Sundeep Rangan

发明人： Siddharth Ray ,  Sundeep Rangan

IPC分类号： G06F7/00 ,  G06F17/10 ,  G06F7/52

CPC分类号： G06F17/10 ,  H04L25/03006 ,  H04L2025/0342 ,  H04L2025/03426

摘要： Methods and apparatus which reduce or completely eliminate non-shift based divisions as part of estimating transmitted symbols and/or generating slicing parameters corresponding to two symbol transmission streams in a wireless communication system are described. A linear least squares error estimation filtering module performs symbol estimations and/or slicing parameter generation while avoiding non-shift based division operations. The linear least squares estimation module generates intermediate parameters, and implements equations which facilitate symbol estimation utilizing shift based divisions while avoiding non-shift based divisions.

摘要翻译： 描述了作为在无线通信系统中估计传输符号和/或生成与两个符号传输流相对应的限幅参数的一部分来减少或完全消除基于非移位的部分的方法和装置。 线性最小二乘误差估计滤波模块执行符号估计和/或限制参数生成，同时避免基于非移位的划分操作。 线性最小二乘估计模块生成中间参数，并且实现方便符号估计的等式，利用基于移位的划分，同时避免基于非移位的划分。

公开(公告)号：US20080013521A1

公开(公告)日：2008-01-17

申请号：US11486540

申请日：2006-07-14

申请人： Sundeep Rangan ,  Junyi Li

发明人： Sundeep Rangan ,  Junyi Li

IPC分类号： H04J3/06

CPC分类号： H04W56/0045 ,  H04L5/003 ,  H04L5/0078 ,  H04L5/0098

摘要： The claimed subject matter relates to acquiring channel access in a wireless communication environment. A wireless terminal may transmit first and second sets of tones over respective first and second contiguous transmission periods. The first and second tone sets may be disjoint from each other and may each comprise a number of contiguous tones. The terminal may then refrain from transmitting during a third time period in order to receive a grant signal from a base station in response to the access request. The beginnings of the first time period and the second time period may be a function of a determined uplink transmission time.

摘要翻译： 所要求保护的主题涉及在无线通信环境中获取信道接入。 无线终端可以在相应的第一和第二连续传输周期上传送第一和第二组音调。 第一和第二音调集可以彼此不相交，并且可以各自包括多个连续的音调。 然后终端可以在第三时间段期间避免发送，以便响应于接入请求从基站接收授权信号。 第一时间段和第二时间段的开始可以是确定的上行链路传输时间的函数。

公开(公告)号：US20050238083A1

公开(公告)日：2005-10-27

申请号：US11168210

申请日：2005-06-27

申请人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Pramod Viswanath

发明人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Pramod Viswanath

IPC分类号： H04J11/00 ,  H04B1/7143 ,  H04B1/7156 ,  H04B7/26 ,  H04L5/02 ,  H04L27/26 ,  H04B1/713

CPC分类号： H04B1/7143 ,  H04B1/7156 ,  H04B2001/71563 ,  H04L5/0019 ,  H04L5/0048 ,  H04L25/0226 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2675

摘要： A base station having the strongest downlink signal is identified by utilizing a unique slope of a pilot tone hopping sequence being transmitted by a base station. Specifically, base station identification is realized by determining the slope of the strongest received pilot signal, i.e., the received pilot signal having the maximum energy. In an embodiment of the invention, the pilot tone hopping sequence is based on a Latin Squares sequence. With a Latin Squares based pilot tone hopping sequence, all a mobile user unit needs is to locate the frequency of the pilot tones at one time because the pilot tone locations at subsequent times can be determined from the slope of the Latin Squares pilot tone hopping sequence. The slope and initial frequency shift of the pilot tone hopping sequence with the strongest received power is determined by employing a unique maximum energy detector. In one embodiment, the slope and initial frequency shift of the pilot signal having the strongest received power is determined by finding the slope and initial frequency shift of a predicted set of pilot tone locations having the maximum received energy. In another embodiment, the frequency shift of the pilot signal with the strongest, i.e., maximum, received power is estimated at each of times “t”. These frequency shifts are employed in accordance with a prescribed relationship to determine the unknown slope and the initial frequency shift of the pilot signal.

摘要翻译： 通过利用由基站发送的导频音跳频序列的唯一斜率，来识别具有最强下行链路信号的基站。 具体地，通过确定最强接收导频信号的斜率，即具有最大能量的接收导频信号来实现基站识别。 在本发明的实施例中，导频音跳频序列基于拉丁方阵序列。 利用基于拉丁方阵的导频音跳频序列，移动用户单元需要的是一次定位导频音频的频率，因为可以从拉丁方正导频音跳频序列的斜率确定随后时间的导频音位置 。 具有最强接收功率的导频音跳频序列的斜率和初始频移通过采用独特的最大能量检测器来确定。 在一个实施例中，具有最大接收功率的导频信号的斜率和初始频移通过找到具有最大接收能量的预测导频音位置集合的斜率和初始频移来确定。 在另一个实施例中，在每个时间“t”处估计具有最强，即最大接收功率的导频信号的频移。 根据规定的关系采用这些频移来确定导频信号的未知斜率和初始频移。

公开(公告)号：US08150345B2

公开(公告)日：2012-04-03

申请号：US12413527

申请日：2009-03-28

申请人： Subhadeep P. Roy ,  Niranjan N. Ratnakar ,  Sundeep Rangan

发明人： Subhadeep P. Roy ,  Niranjan N. Ratnakar ,  Sundeep Rangan

IPC分类号： H04B17/02

CPC分类号： H04B7/0854 ,  H04B7/0417

摘要： A signal received via a plurality of antennas, and containing an interference component and a desired communication component, is processed to suppress the interference component. The interference component is suppressed based on an inverse of a spatial covariance matrix, which inverse is produced without performing a matrix inversion operation.

摘要翻译： 处理经由多个天线接收并包含干扰成分和期望的通信部件的信号，以抑制干扰成分。 基于空间协方差矩阵的逆，抑制干扰分量，而不执行矩阵求逆运算而产生反相。

公开(公告)号：US07957757B2

公开(公告)日：2011-06-07

申请号：US11773939

申请日：2007-07-05

申请人： Samel Celebi ,  Charles Stanski ,  Sundeep Rangan

发明人： Samel Celebi ,  Charles Stanski ,  Sundeep Rangan

IPC分类号： H04Q7/20

CPC分类号： H04W52/50 ,  H04W52/10 ,  H04W52/146

摘要： Provided is an feedback mechanism to correct power control information in a broadcast signal that is determined to be incorrect by one or more devices that receive and rely on the broadcast information. A device that receives the incorrect broadcast information can determine a correction and to the information and provide a recommendation to the source of the broadcast information. The source can selectively determine whether to modify the broadcast information based on the recommendation from one or more devices. If the broadcast information is modified, subsequent devices that receive the broadcast information are provided with the modified information. If further changes are needed, the subsequent devices can provide further recommended changes.

摘要翻译： 提供了一种反馈机制，用于校正由接收并依赖于广播信息的一个或多个设备确定为不正确的广播信号中的功率控制信息。 接收不正确的广播信息的设备可以确定对该信息的修正和提供对广播信息的来源的推荐。 源可以基于来自一个或多个设备的推荐来选择性地确定是否修改广播信息。 如果广播信息被修改，则接收广播信息的后续设备被提供修改的信息。 如果需要进一步的更改，后续设备可以提供进一步的建议更改。