公开(公告)号：US20070242764A1

公开(公告)日：2007-10-18

申请号：US11486609

申请日：2006-07-14

申请人： Pablo Anigstein ,  Prashanth Hande ,  Junyi Li ,  Rajiv Laroia ,  Sathyadev Venkata Uppala

发明人： Pablo Anigstein ,  Prashanth Hande ,  Junyi Li ,  Rajiv Laroia ,  Sathyadev Venkata Uppala

IPC分类号： H04K1/10

CPC分类号： H04L27/2602 ,  H04L5/0007 ,  H04L27/2655

摘要： User specific modulation-symbol scrambling is implemented for various uplink segments, e.g., uplink traffic acknowledgement channel (ULTACH), uplink state request channel (ULSRCH), and uplink dedicated control channel (ULDCCH) segments. A wireless terminal is assigned a wireless terminal scrambling identifier. A set of ordered input modulation symbols are determined for an uplink dedicated segment to which user specific scrambling is to be applied. One bit of the assigned wireless terminal scrambling identifier is associated with each of the ordered input modulation symbols of a segment in accordance with a predetermined mapping. For each input modulation symbol a scrambling operation, e.g., a phase rotation of the input modulation symbol, is performed as a function of the associated user specific scrambling identifier bit to obtain a corresponding output modulation symbol. A value of (0,1) for a scrambling ID bit is associated with a (first, second) amount of phase rotation, e.g., (0, 180) degrees, respectively.

摘要翻译： 针对各种上行链路段（例如，上行链路业务确认信道（ULTACH），上行链路状态请求信道（ULSRCH）和上行链路专用控制信道（ULDCCH））段实现用户特定的调制符号加扰。 无线终端被分配无线终端扰乱标识符。 针对要应用用户特定加扰的上行链路专用段确定一组有序输入调制符号。 所分配的无线终端扰乱标识符的一个比特根据预定的映射与段的每个有序输入调制符号相关联。 对于每个输入调制符号，作为输入调制符号的相位旋转的加扰操作被执行为相关联的用户特定加扰标识符位的函数，以获得相应的输出调制符号。 加扰ID位的（0,1）的值分别与（第一，第二）相位旋转量相关联，例如（0,180）度。

公开(公告)号：US20090109851A1

公开(公告)日：2009-04-30

申请号：US11933042

申请日：2007-10-31

申请人： Junyi Li ,  Rajiv Laroia ,  Sundeep Rangan ,  Thomas Richardson ,  Xinzhou Wu ,  Saurabh Tavildar

发明人： Junyi Li ,  Rajiv Laroia ,  Sundeep Rangan ,  Thomas Richardson ,  Xinzhou Wu ,  Saurabh Tavildar

IPC分类号： H04L12/28

CPC分类号： H04W72/1231 ,  H04W72/1278 ,  H04W84/18 ,  H04W92/18

摘要： Methods and apparatus for use in a wireless communications system in which traffic air link resources may be, and sometimes are, shared are described. Various described methods and apparatus are well suited for use in a peer to peer communications system in which transmission control decisions are made in a decentralized manner. An exemplary peer to peer communications system implements the scheduling of traffic intervals in a distributed manner utilizing connection priority information and interference information. An exemplary peer to peer timing structure includes a user scheduling interval and an associated traffic interval. The user scheduling interval includes a plurality transmission request/request response rounds. By utilizing multiple request/request response rounds, a transmission decision corresponding to a connection to yield in an earlier round can be overridden in a subsequent round, resulting in higher overall traffic throughput in the system.

摘要翻译： 描述用于其中交通空中链路资源可以共享的无线通信系统中的方法和装置。 各种描述的方法和装置非常适合用于以分散方式进行传输控制决定的对等通信系统。 示例性的对等通信系统利用连接优先级信息和干扰信息以分布式方式实现业务间隔的调度。 一种示例性的对等定时结构包括用户调度间隔和相关联的业务间隔。 用户调度间隔包括多个发送请求/请求响应轮。 通过利用多个请求/请求响应轮，可以在随后的一轮中覆盖对应于在较早轮中产生的连接的传输决定，导致系统中更高的总体流量吞吐量。

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：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。

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.

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.

公开(公告)号：US09661519B2

公开(公告)日：2017-05-23

申请号：US11486601

申请日：2006-07-14

申请人： Arnab Das ,  Sundeep Rangan ,  Pablo Anigstein ,  Junyi Li ,  Sathyadev Venkata Uppala ,  Rajiv Laroia

发明人： Arnab Das ,  Sundeep Rangan ,  Pablo Anigstein ,  Junyi Li ,  Sathyadev Venkata Uppala ,  Rajiv Laroia

IPC分类号： H04W24/10 ,  H04L1/00 ,  H04W24/00

CPC分类号： H04W24/10 ,  H04L1/0006 ,  H04L1/0026 ,  H04W24/00

摘要： Techniques for efficiently sending reports in a wireless communication system are described. Reports may be sent repetitively in accordance with a reporting format. A terminal receives an assignment of a control channel used to send reports and determines a reporting format to use based on the assignment. The reporting format indicates a specific sequence of reports sent in specific locations of a control channel frame. The terminal generates a set of reports for each reporting interval and arranges the set of reports in accordance with the reporting format. The terminal repetitively sends a plurality of sets of reports in a plurality of reporting intervals. Reports may also be sent adaptively based on operating conditions. An appropriate reporting format may be selected based on the operating conditions of the terminal, which may be characterized by environment (e.g., mobility), capabilities, QoS, and/or other factors.

公开(公告)号：US20100211540A9

公开(公告)日：2010-08-19

申请号：US11486601

申请日：2006-07-14

申请人： Arnab Das ,  Sundeep Rangan ,  Pablo Anigstein ,  Junyi Li ,  Sathyadev Venkata Uppala ,  Rajiv Laroia

发明人： Arnab Das ,  Sundeep Rangan ,  Pablo Anigstein ,  Junyi Li ,  Sathyadev Venkata Uppala ,  Rajiv Laroia

IPC分类号： G06F17/30

CPC分类号： H04W24/10 ,  H04L1/0006 ,  H04L1/0026 ,  H04W24/00

摘要： Techniques for efficiently sending reports in a wireless communication system are described. Reports may be sent repetitively in accordance with a reporting format. A terminal receives an assignment of a control channel used to send reports and determines a reporting format to use based on the assignment. The reporting format indicates a specific sequence of reports sent in specific locations of a control channel frame. The terminal generates a set of reports for each reporting interval and arranges the set of reports in accordance with the reporting format. The terminal repetitively sends a plurality of sets of reports in a plurality of reporting intervals. Reports may also be sent adaptively based on operating conditions. An appropriate reporting format may be selected based on the operating conditions of the terminal, which may be characterized by environment (e.g., mobility), capabilities, QoS, and/or other factors.

摘要翻译： 描述在无线通信系统中有效地发送报告的技术。 可以按照报告格式重复发送报告。 终端接收用于发送报告的控制信道的分配，并根据分配确定要使用的报告格式。 报告格式指示在控制信道帧的特定位置发送的特定报告序列。 终端为每个报告间隔生成一组报告，并根据报告格式安排报告集。 终端在多个报告间隔重复发送多组报告。 报告也可以根据操作条件自适应地发送。 可以基于可以由环境（例如，移动性），能力，QoS和/或其他因素来表征的终端的操作条件来选择适当的报告格式。

公开(公告)号：US07558245B2

公开(公告)日：2009-07-07

申请号：US11322538

申请日：2005-12-30

申请人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Hemanth T. Sampath

发明人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Hemanth T. 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.

公开(公告)号：US20090129488A1

公开(公告)日：2009-05-21

申请号：US11944197

申请日：2007-11-21

申请人： Rajiv Laroia ,  Sundeep Rangan ,  Junyi Li ,  Thomas Richardson ,  Saurabh Tavildar

发明人： Rajiv Laroia ,  Sundeep Rangan ,  Junyi Li ,  Thomas Richardson ,  Saurabh Tavildar

IPC分类号： H04B1/10 ,  H04L27/28

CPC分类号： H04L27/2647 ,  H04B1/7103 ,  H04B7/0854 ,  H04B7/0857 ,  H04B2201/70702

摘要： Various schemes for reducing effects of interference within communication systems are disclosed. A transmitter transmits a signal in a first time interval and a scrambled version of the signal in a second time interval, which does not overlap with the first time interval. A receiver receives a composite signal including a signal transmitted from the desired transmitter as well as signals from interferers in the first or the second time interval. The receiver determines a dominant interferer and obtains knowledge of signal scrambling done by the interferer as well as the desired transmitter by sensing an identification associated with the interferer or the desired transmitter. This knowledge is employed to determine coefficients for combining the received composite signals received in the first and the second time interval in order to recover the desired signal in a manner that maximizes the SNR associated with the desired signal or completely cancels the dominant interference.

摘要翻译： 公开了用于减少通信系统内的干扰影响的各种方案。 发射机以与第一时间间隔不重叠的第二时间间隔发送第一时间间隔中的信号和信号的加扰版本。 接收机在第一或第二时间间隔中接收包括从所需发射机发送的信号以及来自干扰源的信号的复合信号。 接收机确定主要干扰源，并且通过感测与干扰源或期望发射机相关联的标识来获得由干扰源以及所需发射机完成的信号加扰的知识。 该知识用于确定用于组合在第一和第二时间间隔中接收的接收的复合信号的系数，以便以最大化与期望信号相关联的SNR或完全抵消显性干扰的方式恢复期望信号。