公开(公告)号：US20060133388A1

公开(公告)日：2006-06-22

申请号：US11021310

申请日：2004-12-22

申请人： Michael Wang ,  Bojan Vrcelj ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

发明人： Michael Wang ,  Bojan Vrcelj ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

IPC分类号： H04L12/56

CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0083 ,  H04L27/261

摘要： The embodiments utilize OFDM symbols to communicate network IDs. The IDs are encoded into symbols utilizing the network IDs as seeds to scramble respective pilots that are then transmitted by utilizing the symbols. The pilots can be structured into a single OFDM symbol and/or multiple OFDM symbols. The single symbol structure for transmitting the network IDs is independent of the number of network ID bits and minimizes frequency offset and Doppler effects. The multiple symbol structure allows a much coarser timing accuracy to be employed at the expense of transmitting additional symbols. Several embodiments employ a search function to find possible network ID candidates from a transmitted symbol and a selection function to find an optimum candidate from a network ID candidate list.

摘要翻译： 这些实施例利用OFDM符号来传送网络ID。 ID被编码成使用网络ID作为种子的符号，以对通过利用符号进行发送的各个导频进行加扰。 导频可以被构造成单个OFDM符号和/或多个OFDM符号。 用于发送网络ID的单个符号结构与网络ID比特数无关，并且使频偏和多普勒效应最小化。 多符号结构允许以牺牲传输附加符号为代价采用更粗糙的定时精度。 几个实施例采用搜索功能来从发送的符号和选择功能中找到可能的网络ID候选，以从网络ID候选列表中找到最佳候选。

公开(公告)号：US20050249181A1

公开(公告)日：2005-11-10

申请号：US10926884

申请日：2004-08-25

申请人： Rajiv Vijayan ,  Ashok Mantravadi ,  Krishna Mukkavilli

发明人： Rajiv Vijayan ,  Ashok Mantravadi ,  Krishna Mukkavilli

IPC分类号： H04L25/02 ,  H04L27/26 ,  H04B7/208

CPC分类号： H04L25/022 ,  H04L5/0048 ,  H04L23/02 ,  H04L25/0212 ,  H04L25/0228 ,  H04L27/2662 ,  H04L27/2695

摘要： To allow a receiving entity to derive a longer channel estimate while limiting overhead, a transmitting entity transmits a pilot on different groups of subbands in different time intervals. N subbands in the system are arranged into M non-overlapping groups. Each group includes P=N/M subbands that are uniformly distributed across the N subbands. The transmitting entity transmits the pilot on a different subband group in each time interval, and selects all M subband groups in M time intervals based on a pilot staggering pattern. The receiving entity derives (1) an initial impulse response estimate with P channel taps based on the pilot received on one subband group and (2) two longer impulse response estimates with different lengths used for data detection and time tracking. Each longer impulse response estimate may be derived by filtering initial impulse response estimates for a sufficient number of subband groups using a time-domain filter.

摘要翻译： 为了允许接收实体在限制开销的同时导出更长的信道估计，发送实体以不同的时间间隔在不同的子带组上发送导频。 系统中的N个子带被布置成M个非重叠组。 每组包括均匀分布在N个子带上的P = N / M个子带。 发送实体在每个时间间隔中在不同子带组上发送导频，并且基于导频交错模式以M个时间间隔选择所有M个子带组。 接收实体基于在一个子带组上接收到的导频导出（1）具有P个信道抽头的初始脉冲响应估计，以及（2）用于数据检测和时间跟踪的两个具有不同长度的较长脉冲响应估计。 可以通过使用时域滤波器对足够数量的子带组的初始脉冲响应估计进行滤波来导出更长的脉冲响应估计。

公开(公告)号：US20050152326A1

公开(公告)日：2005-07-14

申请号：US10754796

申请日：2004-01-08

申请人： Rajiv Vijayan ,  Alok Gupta ,  Raghuraman Krishnamoorthi

发明人： Rajiv Vijayan ,  Alok Gupta ,  Raghuraman Krishnamoorthi

IPC分类号： H04L27/26 ,  H04J11/00

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，通过将针对N N C C（例如，最近的）OFDM符号周期获得的度量值与N C 3期望值相关联，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：US20050101319A1

公开(公告)日：2005-05-12

申请号：US10968613

申请日：2004-10-18

申请人： Ramaswamy Murali ,  Gordon Walker ,  Rajiv Vijayan

发明人： Ramaswamy Murali ,  Gordon Walker ,  Rajiv Vijayan

IPC分类号： H04H20/71 ,  G06F20060101 ,  G06Q50/30 ,  H04B7/00 ,  H04N7/08

CPC分类号： H04N5/4401 ,  H04N5/50 ,  H04N21/41407 ,  H04N21/4345 ,  H04N21/4384 ,  H04N21/44222

摘要： Techniques to seamlessly switch reception between multimedia programs are described. For “continued decoding”, a wireless device continues to receive, decode, decompress, and (optionally) display a current program, even after a new program has been selected, until overhead information needed to decode the new program is received. After receiving the overhead information, the wireless device decodes the new program but continues to decompress the current program. The wireless device decompresses the new program after decoding this program. For “early decoding”, the wireless device receives a user input and identifies a program with potential for user selection. The identified program may be the one highlighted by the user input or a program anticipated to be selected based on the user input. The wireless device initiates decoding of the identified program, prior to its selection, so that the program can be decompressed and displayed earlier if it is subsequently selected.

摘要翻译： 描述了在多媒体节目之间无缝切换接收的技术。 对于“继续解码”，即使在选择了新的程序之后，无线设备继续接收，解码，解压缩和（可选地）显示当前程序，直到接收到解码新程序所需的开销信息。 在接收到开销信息之后，无线设备解码新程序，但是继续解压缩当前程序。 解码该程序后，无线设备解压缩新程序。 对于“早期解码”，无线设备接收用户输入并识别具有用户选择潜力的节目。 识别的程序可以是由用户输入或预期将基于用户输入选择的程序突出显示的程序。 无线设备在其选择之前启动所识别的节目的解码，使得如果随后选择该节目，则可以更早地解压缩并显示节目。

公开(公告)号：US06680925B2

公开(公告)日：2004-01-20

申请号：US09982239

申请日：2001-10-16

申请人： Qiang Wu ,  Nagabhushana Sindhushayana ,  Peter J. Black ,  Rajiv Vijayan ,  Rashid Attar

发明人： Qiang Wu ,  Nagabhushana Sindhushayana ,  Peter J. Black ,  Rajiv Vijayan ,  Rashid Attar

IPC分类号： H04Q700

CPC分类号： H04W36/06 ,  H04B7/0491 ,  H04W16/24

摘要： In a disclosed embodiment, signal levels of the active sectors of an access terminal are compared with the signal level of the current serving sector of the access terminal. Next, a delta credit is accumulated. If a DRC lock bit is available, then an accumulated total credit is authorized to produce an authorized accumulated total credit. Afterwards, a new serving sector is identified from a pool of candidate sectors based on the signal levels of the active sectors and the authorized accumulated total credits.

摘要翻译： 在公开的实施例中，将接入终端的活动扇区的信号电平与接入终端的当前服务扇区的信号电平进行比较。 接下来，积累了三角洲信贷。 如果DRC锁定位可用，则累积的总信用额被授权生成授权的累积总额。 之后，基于活动扇区的信号电平和授权的累计总信用，从候选扇区池中识别新的服务扇区。

公开(公告)号：US09356752B2

公开(公告)日：2016-05-31

申请号：US12948759

申请日：2010-11-18

申请人： Michael Mao Wang ,  Bojan Vrcelj ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

发明人： Michael Mao Wang ,  Bojan Vrcelj ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

IPC分类号： H04L5/00 ,  H04L27/26

CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0083 ,  H04L27/261

摘要： The embodiments utilize OFDM symbols to communicate network IDs. The IDs are encoded into symbols utilizing the network IDs as seeds to scramble respective pilots that are then transmitted by utilizing the symbols. The pilots can be structured into a single OFDM symbol and/or multiple OFDM symbols. The single symbol structure for transmitting the network IDs is independent of the number of network ID bits and minimizes frequency offset and Doppler effects. The multiple symbol structure allows a much coarser timing accuracy to be employed at the expense of transmitting additional symbols. Several embodiments employ a search function to find possible network ID candidates from a transmitted symbol and a selection function to find an optimum candidate from a network ID candidate list.

公开(公告)号：US08738614B2

公开(公告)日：2014-05-27

申请号：US11112238

申请日：2005-04-21

申请人： Gordon Kent Walker ,  George Alan Wiley ,  Ricardo Jorge Lopez ,  Richard Doil Lane ,  Rajiv Vijayan

发明人： Gordon Kent Walker ,  George Alan Wiley ,  Ricardo Jorge Lopez ,  Richard Doil Lane ,  Rajiv Vijayan

IPC分类号： G06F7/00 ,  G06F17/30

CPC分类号： H04L29/06027 ,  H04L65/4076 ,  H04L65/4084 ,  H04L65/4092 ,  H04L65/602 ,  H04L65/607 ,  H04N21/23614 ,  H04N21/41407 ,  H04N21/4331 ,  H04N21/4348 ,  H04N21/44016 ,  H04N21/4622 ,  H04N21/6581 ,  H04N21/8455

摘要： System for providing hierarchical services in a data network. A method is provided for inserting content into a content stream for rendering on a device. The method includes obtaining one or more annotation parameters that comprise a content identifier, and determining an insertion point indicator that indicates a location in the content stream. The method also includes retrieving the content based on the content identifier, and inserting the content in the content stream at a location indicated by the insertion point indicator.

摘要翻译： 用于在数据网络中提供分级服务的系统。 提供了一种用于将内容插入到用于在设备上呈现的内容流的方法。 该方法包括获得包含内容标识符的一个或多个注释参数，以及确定指示内容流中的位置的插入点指示符。 该方法还包括基于内容标识符检索内容，并将内容流插入到由插入点指示符指示的位置。

公开(公告)号：US20130156124A1

公开(公告)日：2013-06-20

申请号：US13767834

申请日：2013-02-14

申请人： Michael Mao Wang ,  Murali Ramaswamy Chari ,  Ashok Mantravadi ,  Fuyun Ling ,  Rajiv Vijayan ,  Raghuraman Krishnamoorthi

发明人： Michael Mao Wang ,  Murali Ramaswamy Chari ,  Ashok Mantravadi ,  Fuyun Ling ,  Rajiv Vijayan ,  Raghuraman Krishnamoorthi

IPC分类号： H04L27/26

CPC分类号： H04L27/2601 ,  H03M13/258 ,  H03M13/271 ,  H03M13/2957 ,  H03M13/31 ,  H04L1/0071 ,  H04L1/04 ,  H04L5/0007 ,  H04L5/0042 ,  H04L5/0044 ,  H04L5/0064 ,  H04L5/0083 ,  H04L27/2626 ,  H04L27/2634

摘要： A system and method for frequency diversity uses interleaving in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM) with various FFT sizes. Subcarriers of one or more interlaces are interleaved in a bit reversal fashion and the one or more interlaces are interleaved in the bit reversal fashion.

摘要翻译： 用于频率分集的系统和方法使用利用具有各种FFT大小的正交频分复用（OFDM）的无线通信系统中的交织。 一个或多个交错的子载波以位反向方式进行交织，并且该一个或多个交织以比特反转方式进行交织。

公开(公告)号：US08422434B2

公开(公告)日：2013-04-16

申请号：US10368733

申请日：2003-02-18

申请人： Rajiv Vijayan ,  Avneesh Agrawal ,  Sanjay Jha

发明人： Rajiv Vijayan ,  Avneesh Agrawal ,  Sanjay Jha

IPC分类号： H04W4/00

CPC分类号： H04W72/0453 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0066 ,  H04L27/2614 ,  H04W52/343 ,  H04W52/367

摘要： Techniques for managing peak-to-average power ratio (PAPR) for multi-carrier modulation in wireless communication systems. Different terminals in a multiple-access system may have different required transmit powers. The number of carriers to allocate to each terminal is made dependent on its required transmit power. Terminals with higher required transmit powers may be allocated fewer carriers (associated with smaller PAPR) to allow the power amplifier to operate at higher power levels. Terminals with lower required transmit powers may be allocated more carriers (associated with higher PAPR) since the power amplifier is operated at lower power levels. The specific carriers to assign to the terminals may also be determined by their transmit power levels to reduce out-of-band emissions. Terminals with higher required transmit powers may be assigned with carriers near the middle of the operating band, and terminals with lower required transmit powers may be assigned with carriers near the band edges.

摘要翻译： 用于管理无线通信系统中多载波调制的峰均功率比（PAPR）的技术。 多址系统中的不同终端可能具有不同的所需传输功率。 分配给每个终端的载波数量取决于其所需的发射功率。 具有更高所需发射功率的终端可以被分配较少的载波（与较小的PAPR相关联），以允许功率放大器在较高的功率电平下工作。 由于功率放大器在较低的功率电平下工作，所以具有较低所需发射功率的终端可以分配更多的载波（与更高的PAPR相关联）。 分配给终端的特定载波也可以由其发射功率电平来确定，以减少带外发射。 具有更高要求的发射功率的终端可以被分配到靠近工作频带中间的载波，并且具有较低所需发射功率的终端可以被分配给带边缘附近的载波。

公开(公告)号：US08194796B2

公开(公告)日：2012-06-05

申请号：US12607879

申请日：2009-10-28

申请人： Bruce Collins ,  Rajeev Krishnamurthi ,  Murali Ramaswamy Chair ,  Shusheel Gautam ,  Rajiv Vijayan ,  Seong Taek Chung

发明人： Bruce Collins ,  Rajeev Krishnamurthi ,  Murali Ramaswamy Chair ,  Shusheel Gautam ,  Rajiv Vijayan ,  Seong Taek Chung

IPC分类号： H04L27/06

CPC分类号： H04L1/0065 ,  H04L1/0041 ,  H04L1/0045 ,  H04L1/0058 ,  H04L5/023 ,  H04L27/3488 ,  H04L2001/0098

摘要： A media access control (MAC) layer controller can manage base layer data and enhancement layer data in a layered modulation system. The MAC layer controller can process both base layer data and enhancement layer data and map the encoded symbols to a layered modulation constellation when both are present. If data for one of the layers terminates, then the MAC layer controller can generate and supply predetermined stuffing data to the layer lacking additional data. The MAC layer controller can send a control signal to the physical layer hardware to cause the hardware to map the layered signals having the stuffing data to a modified signal constellation. The MAC controller can also generate an overhead message that indicates the occurrence of the stuffing data. The receiver can receive the overhead message and can use the information to configure the receiver for the layered modulation constellation or the modified signal constellation.

摘要翻译： 媒体访问控制（MAC）层控制器可以在分层调制系统中管理基层数据和增强层数据。 当两者都存在时，MAC层控制器可以处理基本层数据和增强层数据两者并将编码符号映射到分层调制星座。 如果其中一层的数据终止，则MAC层控制器可以生成并向缺少附加数据的层提供预定的填充数据。 MAC层控制器可以向物理层硬件发送控制信号，使得硬件将具有填充数据的分层信号映射到修改的信号星座。 MAC控制器还可以生成指示填充数据的发生的开销消息。 接收机可以接收开销消息，并且可以使用该信息来配置用于分层调制星座或修改的信号星座的接收机。