公开(公告)号：US20090129488A1

公开(公告)日：2009-05-21

申请号：US11944197

申请日：2007-11-21

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

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

IPC: H04B1/10 ,  H04L27/28

CPC classification number: H04L27/2647 ,  H04B1/7103 ,  H04B7/0854 ,  H04B7/0857 ,  H04B2201/70702

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20080144582A1

公开(公告)日：2008-06-19

申请号：US11611882

申请日：2006-12-17

Applicant: Arnab Das ,  Prashanth Hande ,  Sundeep Rangan ,  Xinzhou Wu ,  Juergen Cezanne

Inventor： Arnab Das ,  Prashanth Hande ,  Sundeep Rangan ,  Xinzhou Wu ,  Juergen Cezanne

IPC: H04B7/216

CPC classification number: H04L1/0015 ,  H04L1/0002 ,  H04L1/0033 ,  H04W52/146 ,  H04W52/242 ,  H04W52/243 ,  H04W52/367

Abstract: Systems and methodologies are described that facilitate utilizing power-based rate signaling for uplink scheduling in a wireless communications system. A maximum nominal power (e.g., relative maximum transmit power that may be employed on an uplink) may be known to both a base station and a mobile device. For example, the base station and the mobile device may agree upon a maximum nominal power. According to another example, signaling related to a maximum nominal power for utilization on the uplink may be provided over a downlink. Further, selection of a code rate, modulation scheme, and the like for the uplink may be effectuated by a mobile device as a function of the maximum nominal power. Moreover, such selection may be based at least in part upon an interference cost, which may be evaluated by the mobile device.

Abstract translation: 描述了有助于在无线通信系统中利用基于功率的速率信令用于上行链路调度的系统和方法。 基站和移动设备可以知道最大额定功率（例如，可以在上行链路上采用的相对最大发射功率）。 例如，基站和移动设备可以达成最大额定功率。 根据另一示例，可以在下行链路上提供与在上行链路上的最大标称功率有关的信令。 此外，用于上行链路的码率，调制方案等的选择可以由移动设备作为最大额定功率的函数来实现。 此外，这样的选择可以至少部分地基于可由移动设备评估的干扰成本。

公开(公告)号：US20070149238A1

公开(公告)日：2007-06-28

申请号：US11333771

申请日：2006-01-17

Applicant: Amab Das ,  Sundeep Rangan

Inventor： Amab Das ,  Sundeep Rangan

IPC: H04B7/00

CPC classification number: H04W52/146 ,  H04B17/24 ,  H04W24/10 ,  H04W52/16 ,  H04W52/325 ,  H04W52/365 ,  H04W52/367 ,  H04W52/54

Abstract: A wireless terminal determines the transmission power used for its dedicated control channel at a point in time, and generates a power report indicating a ratio of a maximum wireless terminal transmit power to the transmit power of the dedicated control channel at the point in time. The power report provides a measure of available transmit power for wireless terminal use for other purposes, e.g., uplink traffic channels, after taking into consideration the transmit power used for the dedicated control channel. The point in time has a known time offset from the start of a communications segment in which the power report is transmitted. This allows the base station receiving dedicated control channel uplink signals from the wireless terminal to measure the received signals, receive and process the communicated power report, and correlate information to be used for accurate wireless terminal closed loop power control.

Abstract translation: 无线终端在时间点确定用于其专用控制信道的发送功率，并且生成指示最大无线终端发送功率与该时间点的专用控制信道的发送功率的比率的电力报告。 在考虑到用于专用控制信道的发射功率之后，功率报告提供了用于无线终端用于其它目的（例如上行链路业务信道）的可用发射功率的量度。 该时间点具有从发送功率报告的通信段的开始的已知时间偏移。 这允许基站接收来自无线终端的专用控制信道上行链路信号来测量接收到的信号，接收和处理通信的功率报告，并且将要用于准确的无线终端闭环功率控制的信息相关联。

公开(公告)号：US20070149129A1

公开(公告)日：2007-06-28

申请号：US11487054

申请日：2006-07-14

Applicant: Arnab Das ,  Sundeep Rangan ,  Pablo Anigstein ,  Murari Srinivasan

Inventor： Arnab Das ,  Sundeep Rangan ,  Pablo Anigstein ,  Murari Srinivasan

IPC: H04B17/00

CPC classification number: H04W72/1284 ,  H04B17/24 ,  H04W8/24 ,  H04W24/10 ,  H04W72/1231

Abstract: Methods and apparatus for communicating transmission backlog information are described. Reporting control factors are utilized to expand reporting possibilities for a fixed bit size request report. At least one report control factor is determined as a function of channel quality information, power information, device capability information, and/or quality of service information. A transmission backlog report value is interpreted as a function of a reporting control factor. A wide range of quantization schemes for reporting transmission backlog information are facilitated corresponding to a small bit size report. A communications device can adaptively select a quantization request level closely matched to its current needs such as to provide an accurate representation of its current traffic channel resource needs. A communications device may request a number of frames in a request report and the same report may be indirectly requesting a number of communications segments needed to clear its transmission backlog.

Abstract translation: 描述用于传送传输积压信息的方法和装置。 报告控制因素用于扩展固定位大小请求报告的报告可能性。 至少一个报告控制因子被确定为信道质量信息，功率信息，设备能力信息和/或服务质量信息的函数。 传输积压报告值被解释为报告控制因子的函数。 用于报告传输积压信息的宽范围的量化方案对应于小位尺寸报告是便利的。 通信设备可以自适应地选择与其当前需求紧密匹配的量化请求级别，以提供其当前业务信道资源需求的精确表示。 通信设备可以在请求报告中请求多个帧，并且相同的报告可以间接地请求清除其传输积压所需的多个通信段。

公开(公告)号：US20060099915A1

公开(公告)日：2006-05-11

申请号：US11284285

申请日：2005-11-21

Applicant: Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Frank Lane ,  Prashanth Hande

Inventor： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Frank Lane ,  Prashanth Hande

IPC: H04B7/00

CPC classification number: H04B7/0604 ,  H01Q3/24 ,  H01Q3/2605 ,  H04B7/061 ,  H04B7/0691 ,  H04B7/0805 ,  H04L1/0026 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0026 ,  H04L5/006 ,  H04W52/42

Abstract: 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.

公开(公告)号：US07027429B2

公开(公告)日：2006-04-11

申请号：US09884581

申请日：2001-06-19

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

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

IPC: H04J3/06

CPC classification number: H04L27/2663 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2665 ,  H04L27/2675

Abstract: 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：US20050277429A1

公开(公告)日：2005-12-15

申请号：US10865616

申请日：2004-06-10

Applicant: Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Prashanth Hande

Inventor： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Prashanth Hande

IPC: H04W68/00 ,  H04W68/02 ,  H04Q7/20

CPC classification number: H04W68/025 ,  Y02D70/00

Abstract: Methods and apparatus for efficient two-stage paging wireless communications systems are described. Wireless terminals are assigned to paging groups. A few first paging message information bits are modulated (using non-coherent modulation) into a first paging signal and communicated from a base station to wireless terminals. WTs wake-up, receive the first paging signal and quickly ascertain whether its paging group should expect a second paging signal, if so, the WT is operated to receive the second paging signal; otherwise, the WT goes back to sleep conserving power. The base station modulates (using coherent modulation) a number of second message information bits into a second paging signal and transmits the signal to WTs. From the information in first and second paging signals, a WT can determine that it is the paged WT and process the paging instructions. The intended paged WT can transmit an acknowledgement signal on a dedicated uplink resource.

Abstract translation: 描述了用于有效的两阶段寻呼无线通信系统的方法和装置。 无线终端被分配给寻呼组。 几个第一寻呼消息信息比特被调制（使用非相干调制）到第一寻呼信号中并从基站传送到无线终端。 WT唤醒，接收第一个寻呼信号，并快速确定其寻呼组是否应该预期第二个寻呼信号，如果是，则操作WT接收第二寻呼信号; 否则，WT回去睡眠节省电力。 基站将多个第二消息信息比特（使用相干调制）调制成第二寻呼信号，并将该信号发送给WT。 根据第一和第二寻呼信号中的信息，WT可以确定它是寻呼WT并处理寻呼指令。 预期的寻呼WT可以在专用上行链路资源上发送确认信号。

公开(公告)号：US09572179B2

公开(公告)日：2017-02-14

申请号：US11487054

申请日：2006-07-14

Applicant: Arnab Das ,  Sundeep Rangan ,  Pablo Anigstein ,  Murari Srinivasan

Inventor： Arnab Das ,  Sundeep Rangan ,  Pablo Anigstein ,  Murari Srinivasan

IPC: H04B1/00 ,  H04W72/12 ,  H04B17/24 ,  H04W8/24 ,  H04W24/10

CPC classification number: H04W72/1284 ,  H04B17/24 ,  H04W8/24 ,  H04W24/10 ,  H04W72/1231

Abstract: Methods and apparatus for communicating transmission backlog information are described. Reporting control factors are utilized to expand reporting possibilities for a fixed bit size request report. At least one report control factor is determined as a function of channel quality information, power information, device capability information, and/or quality of service information. A transmission backlog report value is interpreted as a function of a reporting control factor. A wide range of quantization schemes for reporting transmission backlog information are facilitated corresponding to a small bit size report. A communications device can adaptively select a quantization request level closely matched to its current needs such as to provide an accurate representation of its current traffic channel resource needs. A communications device may request a number of frames in a request report and the same report may be indirectly requesting a number of communications segments needed to clear its transmission backlog.

Abstract translation: 描述用于传送传输积压信息的方法和装置。 报告控制因素用于扩展固定位大小请求报告的报告可能性。 至少一个报告控制因子被确定为信道质量信息，功率信息，设备能力信息和/或服务质量信息的函数。 传输积压报告值被解释为报告控制因子的函数。 用于报告传输积压信息的宽范围的量化方案对应于小位尺寸报告是便利的。 通信设备可以自适应地选择与其当前需求紧密匹配的量化请求级别，以提供其当前业务信道资源需求的精确表示。 通信设备可以在请求报告中请求多个帧，并且相同的报告可以间接地请求清除其传输积压所需的多个通信段。

公开(公告)号：US09119220B2

公开(公告)日：2015-08-25

申请号：US11610189

申请日：2006-12-13

Applicant: Arnab Das ,  Sundeep Rangan ,  Yunus Hussain ,  Samel Celebi

Inventor： Arnab Das ,  Sundeep Rangan ,  Yunus Hussain ,  Samel Celebi

IPC: H04B1/04 ,  H04W72/12

CPC classification number: H04W72/1284 ,  H04W72/1221 ,  H04W72/1252

Abstract: Methods and apparatus for efficient communication of backlog information, e.g., backlog information indicating amounts of uplink traffic waiting to transmitted by a wireless terminal are described. Delta backlog reports are used in addition to absolute backlog reports, thus reducing control signaling overhead, at least some information communicated in a delta backlog report being referenced with respect to a previously transmitted backlog report. A base station uses received backlog information from wireless terminals in determining scheduling of uplink traffic channel segments In some embodiments, the absolute backlog report uses a first fixed size report format, while the delta backlog report using a second fixed size report format, said second size being different from said first fixed size.

Abstract translation: 描述了用于积压信息的有效通信的方法和装置，例如指示等待由无线终端发送的上行链路业务量的积压信息。 除了绝对的积压报告之外，还使用了增量积压报告，从而减少了控制信号开销，至少在以前发送的积压报告中引用的增量积压报告中传达的至少一些信息。 基站在确定上行链路业务信道段的调度中使用来自无线终端的接收的积压信息。在一些实施例中，绝对积压报告使用第一固定大小报告格式，而使用第二固定大小报告格式的差异积压报告，所述第二大小 与所述第一固定尺寸不同。

公开(公告)号：US09014134B2

公开(公告)日：2015-04-21

申请号：US12958676

申请日：2010-12-02

Applicant: Sundeep Rangan ,  Junyi Li

Inventor： Sundeep Rangan ,  Junyi Li

IPC: H04W4/00 ,  H04J3/00 ,  H04J3/06 ,  H04W56/00 ,  H04L5/00

CPC classification number: H04W56/0045 ,  H04L5/003 ,  H04L5/0078 ,  H04L5/0098

Abstract: 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.

Abstract translation: 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。