公开(公告)号：US07961593B2

公开(公告)日：2011-06-14

申请号：US12021167

申请日：2008-01-28

申请人： Ron Porat ,  Yu Wen ,  Peter J. Graumann ,  Srikanth Gummadi

发明人： Ron Porat ,  Yu Wen ,  Peter J. Graumann ,  Srikanth Gummadi

IPC分类号： H04J11/00

CPC分类号： H04L27/2647 ,  H04L27/2657 ,  H04L27/2662

摘要： The subject matter disclosed herein provides methods and apparatus, including computer program products, for detecting a preamble to enable acquisition of a downlink. In one aspect, there is provided a method. The method may include receiving a plurality of symbols. From an autocorrelation of the received symbols, a guard interval may be detected. The guard interval may represent a receive/transmit transition gap (RTG). A metric may be used to verify whether at least one symbol positioned after the detected guard interval is a preamble. Related systems, apparatus, methods, and/or articles are also described.

摘要翻译： 本文公开的主题提供了用于检测前导码以使得能够获取下行链路的方法和装置，包括计算机程序产品。 一方面，提供了一种方法。 该方法可以包括接收多个符号。 根据接收到的符号的自相关，可以检测到保护间隔。 保护间隔可以表示接收/发送转换间隙（RTG）。 可以使用度量来验证位于检测到的保护间隔之后的至少一个符号是否是前同步码。 还描述了相关系统，装置，方法和/或制品。

公开(公告)号：US20080176523A1

公开(公告)日：2008-07-24

申请号：US11625254

申请日：2007-01-19

申请人： Todd Sutton ,  Srikanth Gummadi ,  Walid Hosseini ,  Lei Wang

发明人： Todd Sutton ,  Srikanth Gummadi ,  Walid Hosseini ,  Lei Wang

IPC分类号： H04B1/40

CPC分类号： H04B1/0475 ,  H04B1/525 ,  H04L5/0007 ,  H04L5/003 ,  H04L5/0066

摘要： Methods and apparatus for reducing transmit emissions are described herein. The transmit out of band emissions in an adjacent band can be reduced while complying with existing wireless communication standards through utilization of one or more of reduced transmit bandwidth, transmit operating band offset, and channel index remapping. The transceiver can support a receive operating band that is substantially adjacent to a band edge. The transmit operating band can be offset from an adjacent frequency band, and can use a narrower operating band than is supported by the receiver. The transmit baseband signal can have a reduced bandwidth to reduce the amount of noise. The frequency offset can introduce a larger transition band between the transmit operating band edges and the adjacent frequency band of interest. The transceiver can remap channel assignments to compensate for the frequency offset such that the frequency offset introduced in the transmitter is transparent to channel allocation.

摘要翻译： 本文描述了用于减少发射发射的方法和装置。 通过利用减少的发送带宽，发射工作频带偏移和信道索引重映射中的一个或多个，可以减少相邻频带中的发射带外发射，同时遵守现有的无线通信标准。 收发器可以支持基本上与带边缘相邻的接收工作频带。 发射工作频带可以偏离相邻频带，并且可以使用比由接收机支持的更窄的工作频带。 发射基带信号可以具有减小的带宽以减少噪声量。 频率偏移可以在发射工作频带边缘和感兴趣的相邻频带之间引入更大的转换频带。 收发器可以重新分配信道分配以补偿频率偏移，使得在发射机中引入的频率偏移对信道分配是透明的。

公开(公告)号：US07382832B2

公开(公告)日：2008-06-03

申请号：US10903668

申请日：2004-07-30

申请人： David P. Magee ,  Srinath Hosur ,  Michael O. Polley ,  Srikanth Gummadi

发明人： David P. Magee ,  Srinath Hosur ,  Michael O. Polley ,  Srikanth Gummadi

IPC分类号： H04B7/02 ,  H04L1/02

CPC分类号： H04B7/04 ,  H04B7/0669 ,  H04B7/0671

摘要： The present invention provides a time-switched preamble supplement generator for use with a multiple-input, multiple-output (MIMO) transmitter employing N transmit antennas wherein N is at least two. In one embodiment, the time-switched preamble supplement generator includes an initial preamble supplement formatter configured to provide a first permutation of a set of preamble supplements to the N transmit antennas during an initial time interval. The first permutation includes a single first preamble supplement and at least one second preamble supplement. The time-switched preamble supplement generator also includes a subsequent preamble supplement formatter coupled to the initial preamble supplement formatter and configured to provide (N−1) mutually exclusive further permutations of the set to the N transmit antennas during (N−1) subsequent time intervals.

摘要翻译： 本发明提供了一种与使用N个发射天线的多输入多输出（MIMO）发射机一起使用的时间切换前导码补充生成器，其中N是至少两个。 在一个实施例中，时间切换前导码补充生成器包括初始前导码补充格式化器，被配置为在初始时间间隔期间向N个发射天线提供一组前导码补充的第一置换。 第一排列包括单个第一前序补码和至少一个第二前序补码。 所述时间切换前导码补充生成器还包括后续前导码补充格式化器，其耦合到所述初始前导码补充格式器，并且被配置为在（N-1）个后续时间期间向所述N个发射天线提供所述集合的（N-1）个互斥另外的排列 间隔

公开(公告)号：US20080056193A1

公开(公告)日：2008-03-06

申请号：US11469794

申请日：2006-09-01

申请人： Yair Bourlas ,  Adam E. Newham ,  Lei Wang ,  Srikanth Gummadi

发明人： Yair Bourlas ,  Adam E. Newham ,  Lei Wang ,  Srikanth Gummadi

IPC分类号： H04Q7/00

CPC分类号： H04L27/2601 ,  H04B7/2668 ,  H04J11/0073 ,  H04L5/0051 ,  H04W36/0016 ,  H04W36/08 ,  H04W64/006 ,  H04W72/048 ,  H04W72/14 ,  H04W74/004 ,  H04W74/006 ,  H04W74/0833 ,  H04W74/085 ,  H04W74/0875 ,  H04W74/0891 ,  H04W76/28 ,  H04W88/02 ,  H04W88/08

摘要： Systems and methods of pre-allocating identifiers to wireless devices for use in requesting resources over a random access channel are described. A wireless communication system includes a random access channel over which wireless devices can anonymously send requests for resources. The base stations receiving and processing the anonymous requests reduces the probability of random access channel collisions and conserves the resources needed to support the anonymous requests by pre-allocating one or more codes to select wireless devices. The wireless devices having the pre-allocated codes can transmit a particular code over the random access channel as a request for resources that uniquely identifies the requester.

摘要翻译： 描述了将标识符预分配给无线设备以用于在随机接入信道上请求资源的系统和方法。 无线通信系统包括随机接入信道，无线设备可通过该随机接入信道匿名地发送资源请求。 接收和处理匿名请求的基站降低随机接入信道冲突的概率，并通过预分配一个或多个代码来选择无线设备来节省支持匿名请求所需的资源。 具有预先分配的代码的无线设备可以通过随机接入信道发送特定的代码，作为唯一地标识请求者的资源的请求。

公开(公告)号：US20060171488A1

公开(公告)日：2006-08-03

申请号：US11046085

申请日：2005-01-28

申请人： John Rosenlof ,  Kirupairaj Asirvatham ,  Srikanth Gummadi

发明人： John Rosenlof ,  Kirupairaj Asirvatham ,  Srikanth Gummadi

IPC分类号： H04L27/06

CPC分类号： H04L27/2657 ,  H04L27/2675 ,  H04L2027/003

摘要： A communications receiver is provided that includes a first and second compensators 64 and 68, a pilot tracker 60, and a demodulator 66. The first compensator 64 is operable to adjust an input signal based on both a coarse frequency offset and a fine frequency offset to produce an adjusted input signal. The pilot tracker 60 determines an estimated residual frequency offset based on at least a portion of the adjusted input signal. The demodulator 66 determines at least a first symbol sequence and a second symbol sequence based on the adjusted input signal. The second compensator 68 is operable to adjust the first symbol sequence and the second symbol sequence based on the estimate residual frequency offset.

摘要翻译： 提供一种通信接收机，其包括第一和第二补偿器64和68，导频跟踪器60和解调器66.第一补偿器64可操作以基于粗频率偏移和精细频率偏移来调整输入信号 产生调整后的输入信号。 导频跟踪器60基于经调整的输入信号的至少一部分来确定估计的残余频率偏移。 解调器66基于经调整的输入信号确定至少第一符号序列和第二符号序列。 第二补偿器68可操作以基于估计残余频率偏移来调整第一符号序列和第二符号序列。

公开(公告)号：US20050147022A1

公开(公告)日：2005-07-07

申请号：US10744147

申请日：2003-12-22

申请人： Srinath Hosur ,  Srikanth Gummadi ,  Anuj Batra ,  Michael Polley

发明人： Srinath Hosur ,  Srikanth Gummadi ,  Anuj Batra ,  Michael Polley

IPC分类号： H04B7/005 ,  H04J11/00 ,  H04L27/26

CPC分类号： H04W52/325 ,  H04L27/2614 ,  H04L27/2626 ,  H04W52/367 ,  H04W52/52

摘要： A preamble transmit power tailoring system for use with an Orthogonal Frequency Division Multiplexing (OFDM) transmitter, a method of tailoring preamble transmit power, and an OFDM transmitter. In one embodiment, the preamble transmit power tailoring system includes (1) a peak power estimator configured to calculate, based on a payload to be transmitted by the OFDM transmitter and an associated transmit power limitation value, an available power headroom and (2) a preamble power enhancer, associated with the peak power estimator, configured to increase transmit power of at least a portion of a preamble for the payload subject to the available power headroom.

摘要翻译： 一种与正交频分复用（OFDM）发射机一起使用的前导码发射功率调整系统，一种定制前导码发送功率的方法和一种OFDM发射机。 在一个实施例中，前导码发射功率调整系统包括：（1）峰值功率估计器，被配置为基于要由OFDM发射机发射的有效载荷和相关联的发射功率限制值，计算可用的功率余量，以及（2） 与峰值功率估计器相关联的前导码功率增强器被配置为增加对可用功率余量的有效载荷的前导码的至少一部分的发射功率。

公开(公告)号：US06754475B1

公开(公告)日：2004-06-22

申请号：US10185974

申请日：2002-06-28

申请人： Robert Mark Harrison ,  Kamyar Rohani ,  Srikanth Gummadi

发明人： Robert Mark Harrison ,  Kamyar Rohani ,  Srikanth Gummadi

IPC分类号： H03C162

CPC分类号： H04L1/0001 ,  H04B7/04 ,  H04B7/0615 ,  H04B7/0689 ,  H04L1/0025 ,  H04L1/0026

摘要： A method for and wireless communications unit adapted for measuring transmission performance for a signal emanating from an antenna is discussed. The wireless communications unit includes a receiver for receiving the signal in a first and a second time interval to provide, respectively, a first and a second signal; and a channel processor for assessing a relative channel metric corresponding to the first and second signal, the relative channel metric indicative of the transmission performance of a transmission mode. A corresponding method and base transmitter is also arranged and adapted for adjusting a transmission mode based on measured transmission performance and includes a transmitter for sending the signal in the first and second time interval and a base channel processor for determining a channel metric corresponding to the first and second signal, the channel metric indicative of the transmission performance; the transmitter further sending a control signal corresponding to the transmission mode adjusted according to the transmission performance.

摘要翻译： 讨论了一种用于测量从天线发出的信号的传输性能的方法和无线通信单元。 无线通信单元包括接收器，用于在第一和第二时间间隔中接收信号以分别提供第一和第二信号; 以及信道处理器，用于评估对应于第一和第二信号的相对信道度量，表示传输模式的传输性能的相对信道度量。 相应的方法和基站发射机也被布置并适于基于测量的传输性能来调整传输模式，并且包括用于在第一和第二时间间隔内发送信号的发射机和用于确定与第一和第二时间间隔对应的信道度量的基本信道处理器 和第二信号，表示传输性能的信道度量; 发射机进一步发送对应于根据传输性能调整的传输模式的控制信号。

公开(公告)号：US06724327B1

公开(公告)日：2004-04-20

申请号：US10447400

申请日：2003-05-29

申请人： Stephen P. Pope ,  John T. Coffey ,  Srikanth Gummadi

发明人： Stephen P. Pope ,  John T. Coffey ,  Srikanth Gummadi

IPC分类号： H03M740

CPC分类号： H03M13/00

摘要： An electronic device may receive a packet comprising a plurality of codewords comprising pre-processing logic, a first decoder, and a second decoder. The pre-processing logic causes some of said codewords to be provided to the first decoder and other of said codewords to be provided to the second decoder. The codewords may be of different lengths and/or different code rates. Further, the first and second decoders may implement the same or different decoding technique.

摘要翻译： 电子设备可以接收包括包括预处理逻辑，第一解码器和第二解码器的多个码字的分组。 预处理逻辑使得一些所述码字被提供给第一解码器，并且其他所述码字被提供给第二解码器。 码字可以具有不同的长度和/或不同的码率。 此外，第一和第二解码器可以实现相同或不同的解码技术。

公开(公告)号：US09088958B2

公开(公告)日：2015-07-21

申请号：US13301549

申请日：2011-11-21

申请人： Srikanth Gummadi ,  Ron Porat ,  Todd R. Sutton

发明人： Srikanth Gummadi ,  Ron Porat ,  Todd R. Sutton

IPC分类号： H04W64/00 ,  H04W52/28 ,  H04W24/00 ,  H04W28/18

CPC分类号： H04W4/027 ,  H04L5/0007 ,  H04W24/00 ,  H04W24/08 ,  H04W28/18 ,  H04W52/282 ,  H04W64/006 ,  H04W72/048

摘要： Methods and apparatus for identifying a subscriber station which is in motion, determining a mobility metric indicative of a level of mobility of the subscriber station and varying or updating one or more operating parameters based on the mobility metric. An apparatus can determine a measure of mobility based on one or a combination of a plurality of factors, such as variations in signal strength, variations in a channel estimate, or variations in phase or frequency of a particular signal or signal component. The one or more measures of mobility can be combined to form a single measure of mobility, the measure of mobility can be quantized to a predetermined number of mobility levels and one or more operating parameters can be varied or adjusted based on the mobility level.

摘要翻译： 用于识别运动中的用户站的方法和装置，确定表示用户台的移动性水平的移动性度量，并且基于移动性度量改变或更新一个或多个运行参数。 装置可以基于多个因素的一个或组合来确定移动性的度量，例如信号强度的变化，信道估计的变化，或特定信号或信号分量的相位或频率的变化。 移动性的一个或多个测量可以被组合以形成移动性的单个度量，可以将移动性的量度量化到预定数量的移动性水平，并且可以基于移动性水平来改变或调整一个或多个操作参数。

公开(公告)号：US20140355572A1

公开(公告)日：2014-12-04

申请号：US14128353

申请日：2011-07-25

申请人： Aamod Dinkar Khandekar ,  Srikanth Gummadi ,  Kang Wang ,  Minkui Liu

发明人： Aamod Dinkar Khandekar ,  Srikanth Gummadi ,  Kang Wang ,  Minkui Liu

IPC分类号： H04W74/08 ,  H04W52/52

CPC分类号： H04W74/0891 ,  H04W52/52

摘要： A method and apparatus in wireless communications is provided. The method may include measuring received powers levels for a first window of samples, and computing a gain value based on the measured received powers levels. The method may also include determining an offset duration such that the first window of samples and a second window of samples both are included within a downlink region that has downlink power within a threshold level. The method may additionally include applying the gain value to the second window of samples, and the second window of samples may occur after the offset duration.

摘要翻译： 提供了一种无线通信中的方法和装置。 该方法可以包括测量第一采样窗口的接收功率电平，以及基于测量的接收功率电平来计算增益值。 该方法还可以包括确定偏移持续时间，使得第一采样窗口和第二采样窗口都包括在具有阈值电平内的下行链路功率的下行链路区域内。 该方法可以另外包括将增益值应用于第二采样窗口，并且第二采样窗口可以在偏移持续时间之后发生。