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71. 发明申请

US20080013521A1 Uplink access request in an OFDM communication environment 有权
标题翻译： OFDM通信环境中的上行链路接入请求
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。

72. 发明授权

US07039370B2 Methods and apparatus of providing transmit and/or receive diversity with multiple antennas in wireless communication systems 有权
公开(公告)号：US07039370B2
公开(公告)日：2006-05-02
申请号：US10964885
申请日：2004-10-14
申请人： Rajiv Laroia , Junyi Li , Sundeep Rangan , Murari Srinivasan , Frank A. Lane , Prashanth Hande
发明人： Rajiv Laroia , Junyi Li , Sundeep Rangan , Murari Srinivasan , Frank A. Lane , Prashanth Hande
IPC分类号： H04B7/02
CPC分类号： H04B7/0604 , H01Q3/24 , H01Q3/2605 , H04B7/061 , H04B7/0691 , H04B7/0805 , H04L1/0026 , H04L5/0007 , H04L5/0023 , H04L5/0026 , H04L5/006 , H04W52/42
摘要： Transmit and/or receive diversity is achieved using multiple antennas. In some embodiments, a single transmitter chain within a wireless terminal is coupled over time to a plurality of transmit antennas. At any given time, a controllable switching module couples the single transmitter chain to one the plurality of transmit antennas. Over time, the switching module couples the output signals from the single transmitter chain to different transmit antennas. Switching decisions are based upon predetermined information, dwell information, and/or channel condition feedback information. Switching is performed on some dwell and/or channel estimation boundaries. In some OFDM embodiments, each of multiple transmitter chains is coupled respectively to a different transmit antenna. Information to be transmitted is mapped to a plurality of tones. Different subsets of tones are formed for and transmitted through different transmit chain/antenna sets simultaneously. The balance of tones allocated to the subsets for each antenna are changed as a function of predetermined information, dwell information, and/or channel condition feedback information.

73. 发明申请

US20050238083A1 Base station identification in orthongonal frequency division multiplexing based spread spectrum multiple access systems 失效
标题翻译：基于频域分频复用的基站识别基于扩频多址系统
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。

74. 发明申请

US20050036441A1 Methods and apparatus of power control in wireless communication systems 失效
标题翻译：无线通信系统中功率控制的方法和装置
公开(公告)号：US20050036441A1
公开(公告)日：2005-02-17
申请号：US10641308
申请日：2003-08-13
申请人： Rajiv Laroia , Junyi Li , John Fan , Sundeep Rangan , Prashanth Hande
发明人： Rajiv Laroia , Junyi Li , John Fan , Sundeep Rangan , Prashanth Hande
IPC分类号： H04B7/00 , H04B7/005 , H04J11/00 , H04L27/26 , H04L27/36
CPC分类号： H04W52/08 , H04L27/2608 , H04L27/362 , H04W52/56 , H04W52/60
摘要： The present invention involves apparatus and methods to perform wireless terminal transmission power control. The invention uses novel and highly efficient methods to: convey power control information, specify power control level adjustments, recognize power control information, limit interference in the power control signaling, and recognize corrupted power control signaling, thus conserving wireless terminal energy and minimizing power control signaling and associated bandwidth. Base stations send analog power control command signals, with a continuous range of control levels, to wireless terminals for transmission power adjustments. Power control signals include two components which can be used to convey information, e.g., power control commands, signal quality, device identity information. For zero power adjustment, the control component signal is not transmitted. For a non-zero adjustment, power control signals are sent using control ranges and limits, known to the base station and wireless terminal, with the scaling adjusted or synchronized based upon feedback information.
摘要翻译：本发明涉及执行无线终端传输功率控制的装置和方法。本发明使用新颖且高效的方法：传送功率控制信息，指定功率控制电平调整，识别功率控制信息，限制功率控制信令中的干扰，并识别损坏的功率控制信令，从而节省无线终端能量并最小化功率控制信令和相关带宽。基站向无线终端发送模拟功率控制命令信号，具有连续的控制级别，用于传输功率调整。功率控制信号包括可用于传送信息的两个组件，例如功率控制命令，信号质量，设备身份信息。对于零功率调整，控制分量信号不发送。对于非零调整，功率控制信号使用基站和无线终端已知的控制范围和限制，基于反馈信息进行缩放调整或同步。

75. 发明授权

US08571493B2 Methods and apparatus of providing transmit and/or receive diversity with multiple antennas in wireless communication systems 有权
公开(公告)号：US08571493B2
公开(公告)日：2013-10-29
申请号：US12606079
申请日：2009-10-26
申请人： Rajiv Laroia , Junyi Li , Sundeep Rangan , Murari Srinivasan , Frank A. Lane , Prashanth Hande
发明人： Rajiv Laroia , Junyi Li , Sundeep Rangan , Murari Srinivasan , Frank A. Lane , Prashanth Hande
IPC分类号： H04B7/06
CPC分类号： H04B7/0604 , H01Q3/24 , H01Q3/2605 , H04B7/061 , H04B7/0691 , H04B7/0805 , H04L1/0026 , H04L5/0007 , H04L5/0023 , H04L5/0026 , H04L5/006 , H04W52/42
摘要： Transmit and/or receive diversity is achieved using multiple antennas. In some embodiments, a single transmitter chain within a wireless terminal is coupled over time to a plurality of transmit antennas. At any given time, a controllable switching module couples the single transmitter chain to one the plurality of transmit antennas. Over time, the switching module couples the output signals from the single transmitter chain to different transmit antennas. Switching decisions are based upon predetermined information, dwell information, and/or channel condition feedback information. Switching is performed on some dwell and/or channel estimation boundaries. In some OFDM embodiments, each of multiple transmitter chains is coupled respectively to a different transmit antenna. Information to be transmitted is mapped to a plurality of tones. Different subsets of tones are formed for and transmitted through different transmit chain/antenna sets simultaneously. The balance of tones allocated to the subsets for each antenna are changed as a function of predetermined information, dwell information, and/or channel condition feedback information.

76. 发明授权

US08150345B2 Simplified interference suppression in multi-antenna receivers 有权
标题翻译：多天线接收机中的简化干扰抑制
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。

77. 发明申请

US20110075639A1 UPLINK ACCESS REQUEST IN AN OFDM COMMUNICATION ENVIRONMENT 有权
标题翻译： OFDM通信环境中的UPLINK接入请求
公开(公告)号：US20110075639A1
公开(公告)日：2011-03-31
申请号：US12958676
申请日：2010-12-02
申请人： Sundeep Rangan , Junyi Li
发明人： Sundeep Rangan , Junyi Li
IPC分类号： H04W72/04 , 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。

78. 发明授权

US07397838B2 Base station identification in orthogonal frequency division multiplexing based spread spectrum multiple access systems 失效
标题翻译：基于正交频分复用的扩频多址系统中的基站识别
公开(公告)号：US07397838B2
公开(公告)日：2008-07-08
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： 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.
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。

79. 发明申请

US20060104257A1 Method and apparatus for time and frequency synchronization of OFDM communication systems 失效
公开(公告)号：US20060104257A1
公开(公告)日：2006-05-18
申请号：US11322538
申请日：2005-12-30
申请人： Rajiv Laroia , Junyi Li , Sundeep Rangan , Hemanth Sampath
发明人： Rajiv Laroia , Junyi Li , Sundeep Rangan , Hemanth Sampath
IPC分类号： H04J3/06
CPC分类号： H04L27/2663 , H04L27/2659 , H04L27/266 , H04L27/2665 , H04L27/2675
摘要： A method and apparatus for joint time and frequency synchronization for orthogonal frequency division multiplexing (OFDM) systems. A multitone pilot signal is sent in a designated OFDM symbol period. The receiver synchronizes to the pilot signal in a two-stage procedure. The first stage estimates the frequency offset coarsely with a frequency-domain correlation method and estimates the time offset with smoothed time-domain correlation. In a multipath channel, the smoothed time offset estimate is used to locate a cyclic prefix interval which captures the maximum total signal energy. The second stage improves the frequency estimate with a computationally efficient numerical optimization method.

80. 发明授权

US06553019B1 Communications system employing orthogonal frequency division multiplexing based spread sprectrum multiple access 有权
公开(公告)号：US06553019B1
公开(公告)日：2003-04-22
申请号：US09472074
申请日：1999-12-23
申请人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala , Sundeep Rangan
发明人： Rajiv Laroia , Junyi Li , Sathyadev Venkata Uppala , Sundeep Rangan
IPC分类号： H04J100
CPC分类号： H04L5/026 , H04B1/7136 , H04B1/7143 , H04L5/0007
摘要： Tone sequences in a frequency hopping arrangement are generated and assigned by advantageously employing a combination of a sequence generator and a sequence assignor to generate sequences and assign them on a time slot by time slot basis. In a transmitter, the sequence generator and sequence assignor, in combination with a user tone assignor are employed to generate and assign tone sequences to a user on a time slot by time slot basis. In a receiver, the sequence generator and sequence assignor, in combination with a user tone identifier are employed to generate sequences and to identify incoming tone sequences to a user on a time slot by time slot basis. Specifically, the sequence assignment in a time slot is such that a prescribed plurality of sequences is assigned to a particular user. This partitioning of the tasks facilitates the use of a sequence generator that generates sequences with the desirable properties of interference and frequency diversity and, which, leaves the task of properly assigning these sequences among one or more users to the sequence assignor. The sequence assignor functions in such a manner that the interference and frequency diversity properties for the one or more users are preserved, and this is further facilitated by assigning sequences in such a manner that they maximally overlap prior assigned sequences. In one embodiment of the invention, a Latin square based sequence is generated in accordance with a first prescribed process. In a second embodiment of the invention, a Latin cube based sequence is generated in accordance with a second prescribed process. In a third embodiment of the invention, a Latin hypercube of prescribed dimension based sequence is generated in accordance with a third prescribed process. In still another embodiment of the invention, the principles of the invention are employed to realize frequency band hopping.

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