公开(公告)号：US09118111B2

公开(公告)日：2015-08-25

申请号：US11405832

申请日：2006-04-17

申请人： Ayman Fawzy Naguib ,  Alexei Gorokhov ,  Rajiv Vijayan

发明人： Ayman Fawzy Naguib ,  Alexei Gorokhov ,  Rajiv Vijayan

IPC分类号： H04B17/00 ,  H01Q3/26 ,  H04B17/12 ,  H04B17/21 ,  H04B17/24

CPC分类号： H01Q3/267 ,  H04B17/12 ,  H04B17/21 ,  H04B17/24

摘要： Calibration for a transmit chain of a device transmitting information to multiple devices over wireless links includes selecting from between two or more calibration determination techniques. In certain aspects the techniques include phase only calibration and phase and amplitude calibration.

摘要翻译： 通过无线链路向多个设备发送信息的设备的发送链的校准包括从两个或更多个校准确定技术之间进行选择。 在某些方面，这些技术包括仅相位校准和相位和幅度校准。

公开(公告)号：US09003243B2

公开(公告)日：2015-04-07

申请号：US11192788

申请日：2005-07-29

申请人： Michael Mao Wang ,  Fuyun Ling ,  Murali Ramaswamy Chari ,  Rajiv Vijayan

发明人： Michael Mao Wang ,  Fuyun Ling ,  Murali Ramaswamy Chari ,  Rajiv Vijayan

IPC分类号： G06F11/00 ,  G11C29/00 ,  H03M13/00 ,  H03M7/00 ,  H04L1/00 ,  H03M13/27 ,  H04L5/00 ,  H04L25/02 ,  H04L27/26

CPC分类号： H04L1/0071 ,  H01R24/38 ,  H03M13/27 ,  H03M13/271 ,  H03M13/2757 ,  H03M13/276 ,  H03M13/2771 ,  H04L1/00 ,  H04L1/0041 ,  H04L1/0066 ,  H04L1/007 ,  H04L5/0007 ,  H04L5/0042 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/0083 ,  H04L25/0226 ,  H04L27/2607 ,  H04L27/261 ,  H04L27/2626 ,  H04L27/2656 ,  H04L27/2662

摘要： A system and method for modulation diversity uses interleaving. Code bits are placed into groups and are then shuffled within each group.

摘要翻译： 用于调制分集的系统和方法使用交织。 代码位被放置成组，然后在每个组内进行混洗。

公开(公告)号：US08737470B2

公开(公告)日：2014-05-27

申请号：US12777540

申请日：2010-05-11

申请人： Gordon Kent Walker ,  Rajiv Vijayan ,  Seong Taek Chung ,  Murali Ramaswamy Chari ,  Fuyun Ling

发明人： Gordon Kent Walker ,  Rajiv Vijayan ,  Seong Taek Chung ,  Murali Ramaswamy Chari ,  Fuyun Ling

IPC分类号： H04B1/66 ,  H04N11/02 ,  H04N11/04 ,  H04N7/12

CPC分类号： H04L27/3488 ,  H04W52/0245 ,  Y02D70/00

摘要： A wireless communication apparatus in a hierarchically coded modulation system can use error control mechanisms generated during decoding of base layer information to predict a probability of successful demodulation of enhancement layer information. Performance in the demodulation of the base layer correlates to performance in the demodulation of the enhancement layer. The receiver can determine whether to attempt demodulation of temporally correlated enhancement layer data based in part on the predicted probability of success. If the receiver determines not to demodulate the enhancement layer, the receiver can power down the enhancement layer demodulator, or otherwise minimize the power expended in the enhancement layer demodulator.

摘要翻译： 分级编码调制系统中的无线通信装置可以使用在解码基层信息期间产生的误差控制机制来预测增强层信息的成功解调的概率。 基层解调性能与增强层解调性能有关。 接收机可以部分地基于预测的成功概率来确定是否尝试对时间相关的增强层数据的解调。 如果接收机确定不解调增强层，则接收机可以将增强层解调器断电，或以其他方式最小化增强层解调器中消耗的功率。

公开(公告)号：US08477809B2

公开(公告)日：2013-07-02

申请号：US11834671

申请日：2007-08-06

申请人： Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

发明人： Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

IPC分类号： H04J3/06 ,  H04J9/00 ,  H04W4/00 ,  H04L27/28

CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0044 ,  H04L25/0224

摘要： A transmitter or receiver device includes a processing system configured to have one or more pilot interlace vectors and one or more distance vectors. The processing system is further configured to generate a first slot interlace for a first slot based on the one or more pilot interlace vectors, and is further configured to generate a second slot interlace for a second slot based on the first slot interlace and the one or more distance vectors. Additional slot interlaces for all other slots may also be generated based on the first slot interlace and the one or more distance vectors.

摘要翻译： 发射机或接收机设备包括被配置为具有一个或多个导频交织向量和一个或多个距离向量的处理系统。 所述处理系统还被配置为基于所述一个或多个导频交错向量来生成用于第一时隙的第一时隙交织，并且还被配置为基于所述第一时隙交织和所述第一时隙交织而生成用于第二时隙的第二时隙交织， 更多距离矢量。 也可以基于第一时隙交错和一个或多个距离矢量来生成用于所有其他时隙的附加时隙交织。

公开(公告)号：US08355354B2

公开(公告)日：2013-01-15

申请号：US12646520

申请日：2009-12-23

申请人： Rajiv Vijayan ,  Fuyun Ling ,  Gordon K. Walker ,  Murali R. Chari ,  Ashok Mantravadi ,  Anand D. Subramaniam

发明人： Rajiv Vijayan ,  Fuyun Ling ,  Gordon K. Walker ,  Murali R. Chari ,  Ashok Mantravadi ,  Anand D. Subramaniam

IPC分类号： H04H20/71

CPC分类号： H04L5/0041 ,  H04L5/0007 ,  H04L5/0044 ,  H04L5/0048 ,  H04L12/189 ,  H04W72/005

摘要： To broadcast different types of transmission having different tiers of coverage in a wireless broadcast network, each base station processes data for a wide-area transmission in accordance with a first mode (or coding and modulation scheme) to generate data symbols for the wide-area transmission and processes data for a local transmission in accordance with a second mode to generate data symbols for the local transmission. The first and second modes are selected based on the desired coverage for wide-area and local transmissions, respectively. The base station also generates pilots and overhead information for local and wide-area transmissions. The data, pilots, and overhead information for local and wide-area transmissions are multiplexed onto their transmission spans, which may be different sets of frequency subbands, different time segments, or different groups of subbands in different time segments. More than two different types of transmission may also be multiplexed and broadcast.

摘要翻译： 为了在无线广播网络中广播具有不同层次的不同类型的传输，每个基站根据第一模式（或编码和调制方案）处理广域传输的数据，以产生广域的数据符号 根据第二模式传输和处理用于本地传输的数据，以产生用于本地传输的数据符号。 分别基于广域和本地传输的期望覆盖来选择第一和第二模式。 基站还为本地和广域传输生成导频和开销信息。 用于本地和广域传输的数据，导频和开销信息被复用到它们的传输跨度，其可以是不同组的频率子带，不同时间段或不同时间段中的不同子带组。 多于两种不同类型的传输也可以被复用和广播。

公开(公告)号：US08223853B2

公开(公告)日：2012-07-17

申请号：US11329891

申请日：2006-01-10

申请人： Rajiv Vijayan ,  Seong Taek Chung ,  Thomas Sun

发明人： Rajiv Vijayan ,  Seong Taek Chung ,  Thomas Sun

IPC分类号： H04K1/10

CPC分类号： H04L27/3488 ,  H04L1/0045 ,  H04L1/005 ,  H04L1/0065 ,  H04L1/0066 ,  H04L1/007 ,  H04L27/2608 ,  H04L27/2626 ,  H04L27/2647 ,  H04L27/2649 ,  H04L2001/0098

摘要： A decoder for a layered modulation system can be configured to independently and concurrently decode each of a base and enhancement layer. The base layer decoder and enhancement layer decoder can be configured substantially in parallel and can each operate concurrently on the same received layered modulation symbol. Each of the base and enhancement layer decoders can be configured with a bit metric module that is configured to determine a signal quality metric based on the received symbol. In systems having turbo encoded data, the bit metric module can be configured to determine a log likelihood ratio. The ratio is based in part on a channel estimate and an energy ratio used in the layered modulation constellation.

摘要翻译： 用于分层调制系统的解码器可以被配置为独立地并且解码每个基本和增强层。 基本层解码器和增强层解码器可以基本并行配置，并且可以在相同的接收分层调制符号上同时操作。 基本和增强层解码器中的每一个可以配置有位度量模块，其被配置为基于接收到的符号来确定信号质量度量。 在具有turbo编码数据的系统中，比特量度模块可被配置为确定对数似然比。 该比率部分地基于在分层调制星座中使用的信道估计和能量比。

公开(公告)号：US08175123B2

公开(公告)日：2012-05-08

申请号：US11371837

申请日：2006-03-08

申请人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Rajiv Vijayan ,  Michael Mao Wang

发明人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Rajiv Vijayan ,  Michael Mao Wang

IPC分类号： H04J3/08

CPC分类号： H04L27/2662 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0216 ,  H04L25/022 ,  H04L25/0228 ,  H04L27/261 ,  H04L27/265 ,  H04L27/2665 ,  H04L27/2679

摘要： A method for positioning a collection window for a Fourier transform function is disclosed. A first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol are received. The first OFDM symbol comprises a plurality of frequency division multiplexed (FDM) symbols. The first OFDM symbol is characterized by at least two of the following: a delay spread, a first arriving path (FAP), or a last arriving path (LAP). A channel location is estimated from a channel impulse response. A point relative to the channel location is selected. A beginning of the collection window is positioned for the second OFDM symbol at the selected point. Alternatively, a point is selected at a first location relative to the channel location using a first algorithm if a delay spread is less than a predetermined length. The selected point is chosen at a second location relative to the channel location using a second algorithm if the delay spread is greater than the predetermined length.

摘要翻译： 公开了一种用于定位用于傅立叶变换函数的收集窗口的方法。 接收第一正交频分复用（OFDM）符号和第二OFDM符号。 第一OFDM符号包括多个频分复用（FDM）符号。 第一OFDM符号的特征在于以下至少两个：延迟扩展，第一到达路径（FAP）或最后到达路径（LAP）。 从信道脉冲响应估计信道位置。 选择相对于通道位置的点。 收集窗口的开始位于所选点处的第二OFDM符号。 或者，如果延迟扩展小于预定长度，则使用第一算法在相对于信道位置的第一位置处选择点。 如果延迟扩展大于预定长度，则使用第二算法在相对于信道位置的第二位置处选择所选择的点。

公开(公告)号：US20120002623A1

公开(公告)日：2012-01-05

申请号：US13178357

申请日：2011-07-07

申请人： Aamod Khandekar ,  Alexei Gorokhov ,  Avneesh Agrawal ,  Rajiv Vijayan ,  Edward Harrison Teague ,  Fatih Ulupinar

发明人： Aamod Khandekar ,  Alexei Gorokhov ,  Avneesh Agrawal ,  Rajiv Vijayan ,  Edward Harrison Teague ,  Fatih Ulupinar

IPC分类号： H04W72/04

CPC分类号： H04L5/023 ,  H04L27/2602 ,  H04W48/12

摘要： To support mobile stations that are not capable of demodulating the entire bandwidth or that can be made to demodulate less than the entire bandwidth, a system, apparatus and method are provided to schedule users on less than all of the bandwidth. Further, certain users can be scheduled on more of the bandwidth than others.

摘要翻译： 为了支持不能解调整个带宽或者可以使其解调的小于整个带宽的移动站，提供了一种系统，装置和方法，以在小于全部带宽上调度用户。 此外，某些用户可以比其他用户更多地调度带宽。

公开(公告)号：US07746760B2

公开(公告)日：2010-06-29

申请号：US10754796

申请日：2004-01-08

申请人： Rajiv Vijayan ,  Alok Kumar Gupta ,  Raghuraman Krishnamoorthi

发明人： Rajiv Vijayan ,  Alok Kumar Gupta ,  Raghuraman Krishnamoorthi

IPC分类号： H04J11/00 ,  H04J3/06

CPC分类号： H04L27/2656 ,  H04L27/2657 ,  H04L27/2675

摘要： Frequency error estimation and frame synchronization are performed at a receiver in an OFDM system based on a metric that is indicative of detected pilot power. The metric may be defined based on cross-correlation between two received symbols obtained in two OFDM symbol periods. For frequency error estimation, a metric value is computed for each of multiple hypothesized frequency errors. The hypothesized frequency error for the metric value with the largest magnitude is provided as the estimated frequency error. For frame synchronization, a correlation value is obtained for each OFDM symbol period by correlating metric values obtained for NC (e.g., most recent) OFDM symbol periods with NC expected values. The expected values are computed in a manner consistent with the manner in which the metric values are computed. Peak detection is performed on the correlation values obtained for different OFDM symbol periods to determine frame synchronization.

摘要翻译： 基于指示检测到的导频功率的度量，在OFDM系统中的接收机处执行频率误差估计和帧同步。 可以基于在两个OFDM符号周期中获得的两个接收符号之间的互相关来定义度量。 对于频率误差估计，针对多个假设的频率误差中的每一个计算度量值。 提供具有最大幅度的度量值的假设频率误差作为估计的频率误差。 对于帧同步，通过将为NC（例如，最近的）OFDM符号周期获得的度量值与NC预期值相关联，获得每个OFDM符号周期的相关值。 以与计算度量值的方式一致的方式计算期望值。 对针对不同的OFDM符号周期获得的相关值执行峰值检测以确定帧同步。

公开(公告)号：US07725799B2

公开(公告)日：2010-05-25

申请号：US11096320

申请日：2005-03-31

申请人： Gordon Kent Walker ,  Rajiv Vijayan ,  Seong Taek Chung ,  Murali Ramaswamy Chari ,  Fuyun Ling

发明人： Gordon Kent Walker ,  Rajiv Vijayan ,  Seong Taek Chung ,  Murali Ramaswamy Chari ,  Fuyun Ling

IPC分类号： H03M13/00 ,  H03M13/03

CPC分类号： H04L27/3488 ,  H04W52/0245 ,  Y02D70/00

摘要： A wireless communication apparatus in a hierarchically coded modulation system can use error control mechanisms generated during decoding of base layer information to predict a probability of successful demodulation of enhancement layer information. Performance in the demodulation of the base layer correlates to performance in the demodulation of the enhancement layer. The receiver can determine whether to attempt demodulation of temporally correlated enhancement layer data based in part on the predicted probability of success. If the receiver determines not to demodulate the enhancement layer, the receiver can power down the enhancement layer demodulator, or otherwise minimize the power expended in the enhancement layer demodulator.

摘要翻译： 分级编码调制系统中的无线通信装置可以使用在解码基层信息期间产生的误差控制机制来预测增强层信息的成功解调的概率。 基层解调性能与增强层解调性能有关。 接收机可以部分地基于预测的成功概率来确定是否尝试对时间相关的增强层数据的解调。 如果接收机确定不解调增强层，则接收机可以将增强层解调器断电，或以其他方式最小化增强层解调器中消耗的功率。