公开(公告)号：US08780828B2

公开(公告)日：2014-07-15

申请号：US13119309

申请日：2009-09-03

Applicant: Monisha Ghosh ,  Vasanth Gaddam ,  Kiran Challapali

Inventor： Monisha Ghosh ,  Vasanth Gaddam ,  Kiran Challapali

IPC: H04W4/00 ,  H04W72/04 ,  H04W88/08 ,  H04W76/00

CPC classification number: H04W72/04 ,  H04W16/14 ,  H04W76/00 ,  H04W88/08

Abstract: A detector module (100) is operable in a cognitive radio device and capable of determining channel occupancy. The detector module comprises a sensor (110) for sensing incumbent signals at a variable sensing threshold, wherein the sensor generates a first occupancy indication indicating whether the channel includes an incumbent signal having a sensing metric above the variable sensing threshold; a geo-location unit (120) for generating a second occupancy indication based on a location of the detector module; and a decision unit (130) for generating an occupancy decision based on both the first occupancy indication and the second occupancy indication.

Abstract translation: 检测器模块（100）可在认知无线电设备中操作并且能够确定信道占用。 检测器模块包括用于感测在可变感测阈值处的现有信号的传感器（110），其中传感器产生第一占用指示，指示信道是否包括具有高于可变感测阈值的感测度量的在线信号; 地理位置单元（120），用于基于所述检测器模块的位置产生第二占用指示; 以及用于基于所述第一占用指示和所述第二占用指示两者来生成占用决定的决定单元（130）。

公开(公告)号：US08175046B2

公开(公告)日：2012-05-08

申请号：US12066853

申请日：2006-09-14

Applicant: Carlos Cordeiro ,  Kiran Challapali

Inventor： Carlos Cordeiro ,  Kiran Challapali

IPC: H04W4/00 ,  H04J3/16

CPC classification number: H04W16/14 ,  H04W48/08 ,  H04W72/10 ,  H04W72/12 ,  H04W76/30 ,  H04W80/02 ,  H04W92/10

Abstract: A wireless system and method including a medium access control (MAC) layer adapted to notify a wireless station of the presence or absence of an incumbent wireless are described.

Abstract translation: 描述了包括适于通知无线站的介质访问控制（MAC）层的无线系统和方法，即存在或不存在现有无线的无线系统和方法。

公开(公告)号：US07650126B2

公开(公告)日：2010-01-19

申请号：US10599749

申请日：2005-04-04

Applicant: Dagnachew Birru ,  Stefan Mangold ,  Kiran Challapali ,  Javier Del Prado Pavon

Inventor： Dagnachew Birru ,  Stefan Mangold ,  Kiran Challapali ,  Javier Del Prado Pavon

IPC: H04B17/00 ,  H04B1/00 ,  H04B15/00

CPC classification number: H04W16/06 ,  H04B1/71632 ,  H04B1/719 ,  H04W16/14

Abstract: A method and system for efficiently utilizing frequency spectrum resources is disclosed. The method comprises the steps of determining at least one spectrum opportunity (510), wherein the opportunity is identified by a frequency range and a time duration, determining a set of altered transmission characteristics (515, 517) to allow transmission of a desired signal in the identified frequency range, wherein the altered transmission characteristics avoid interference with signals expected in the frequency range, and transmitting said desired signal using the altered transmission characteristics when the transmission occurs during said time duration. In one aspect of the system, the step of determining at least one opportunity comprises the steps of receiving signals in known frequency ranges, and determining the characteristics of the received signals. The system comprises a receiving unit (1001) for receiving information items regarding at least one receivable signal, a processing unit (862) for determining characteristics of the at least one received signal, a managing unit (864) for altering transmission characteristics of a desired signal based on the determined received signal characteristics, wherein the altered transmission characteristics avoid interference with the received signals and a transmission unit (866) receiving said altered transmission characteristics to transmit said desired signal. In one aspect, the desired signal transmission characteristics are altered in a frequency range/time period to avoid interference with received signals in the frequency range.

Abstract translation: 公开了一种有效利用频谱资源的方法和系统。 该方法包括以下步骤：确定至少一个频谱机会（510），其中通过频率范围和持续时间识别机会，确定一组改变的传输特性（515,517），以允许传输期望信号 所述识别的频率范围，其中所述改变的传输特性避免对在所述频率范围内期望的信号的干扰，并且当在所述持续时间期间发生传输时，使用改变的传输特性来发送所述期望信号。 在系统的一个方面，确定至少一个机会的步骤包括以下步骤：接收已知频率范围内的信号，并确定接收到的信号的特性。 该系统包括用于接收关于至少一个可接收信号的信息项的接收单元（1001），用于确定所述至少一个接收信号的特性的处理单元（862），用于改变所需接收信号的传输特性的管理单元（864） 基于所确定的接收信号特性的信号，其中所述改变的传输特性避免对接收到的信号的干扰;以及发送单元（866），接收所述改变的传输特性以发送所述期望信号。 在一个方面，期望的信号传输特性在频率范围/时间段内改变，以避免在频率范围内对接收信号的干扰。

公开(公告)号：US20090252219A1

公开(公告)日：2009-10-08

申请号：US11721830

申请日：2005-12-12

Applicant: Yingwei Chen ,  Ruediger Schmitt ,  Richard Chen ,  Karl Wittig ,  Kiran Challapali

Inventor： Yingwei Chen ,  Ruediger Schmitt ,  Richard Chen ,  Karl Wittig ,  Kiran Challapali

IPC: H04N11/02

CPC classification number: H04N21/43637 ,  H04L47/50 ,  H04N21/234327 ,  H04N21/2402 ,  H04N21/2662 ,  H04N21/43615

Abstract: An apparatus, system and method are provided for adaptive flow control of layered streaming video over wireless local area networks (WLANs). In one aspect prioritised and adaptive transmission mechanisms are provided based on buffer fullness and discarding visually less important packets so that future visually more important packets can reach the decoder in time. In another aspect, aggregated control is provided for all video applications as well as separate control for each video application.

Abstract translation: 提供了一种用于通过无线局域网（WLAN）的分层流视频的自适应流控制的装置，系统和方法。 在一个方面，基于缓冲器充满度提供优先级和自适应传输机制，并且丢弃视觉上不太重要的分组，使得将来视觉上更重要的分组可以及时到达解码器。 在另一方面，为所有视频应用提供聚合控制以及针对每个视频应用的单独控制。

公开(公告)号：US20090040986A1

公开(公告)日：2009-02-12

申请号：US12066867

申请日：2006-09-14

Applicant: Carlos Cordeiro ,  Kiran Challapali

Inventor： Carlos Cordeiro ,  Kiran Challapali

IPC: H04W4/00

CPC classification number: H04W72/0406 ,  H04L1/22 ,  H04L5/06 ,  H04W16/06 ,  H04W74/00 ,  H04W76/10 ,  H04W84/12

Abstract: A wireless system and method including a medium access control (MAC) layer adapted to recover service in restricted channels.

Abstract translation: 一种无线系统和方法，包括适于在受限通道中恢复服务的介质访问控制（MAC）层。

公开(公告)号：US20080247376A1

公开(公告)日：2008-10-09

申请号：US10597391

申请日：2005-02-02

Applicant: Javier Del Prado Pavon ,  Amjad Soomro ,  SaiShankar Nandagopalan ,  Zhun Zhong ,  Kiran Challapali ,  Joerg Habetha ,  Guido Hiertz

Inventor： Javier Del Prado Pavon ,  Amjad Soomro ,  SaiShankar Nandagopalan ,  Zhun Zhong ,  Kiran Challapali ,  Joerg Habetha ,  Guido Hiertz

IPC: H04J3/00

CPC classification number: H04W48/08 ,  H04W28/06 ,  H04W52/0216 ,  H04W52/0219 ,  H04W74/04 ,  H04W80/00 ,  H04W84/12 ,  H04W84/18 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/22

Abstract: A distributed MAC protocol is provided that includes a superframe (102) having a slotted Beaconing Period (104) and a data transfer period (103). The provided superframe (102) comprises a plurality of medium access slots (107) and a plurality of medium access slots (107) is assigned to the slotted Beaconing Period (104). The Beaconing Period length (106) may be fixed or variable. The provided Beaconing protocol defines initializing an ad hoc network by means of starting (101) a Beaconing Period (104), joining an existing Beaconing Period (104) of ad hoc network and resolving collisions during the Beaconing Period.

Abstract translation: 提供了分布式MAC协议，其包括具有时隙信标定时周期（104）和数据传送周期（103）的超帧（102）。 所提供的超帧（102）包括多个媒体接入时隙（107），并且多个媒体接入时隙（107）被分配给时隙信标时段（104）。 信标期长度（106）可以是固定的或可变的。 提供的信标协议定义了通过启动（101）信标时段（104）来初始化自组织网络，加入现有的自组织网络的信标时段（104）并且在信标期间解决冲突。

公开(公告)号：US20070189244A1

公开(公告)日：2007-08-16

申请号：US10598647

申请日：2005-03-04

Applicant: Javier del Prado Pavon ,  Sai Shankar Nandagopalan ,  Kiran Challapali ,  Joerg Habetha

Inventor： Javier del Prado Pavon ,  Sai Shankar Nandagopalan ,  Kiran Challapali ,  Joerg Habetha

IPC: H04Q7/24

CPC classification number: H04W74/06 ,  H04W28/18 ,  H04W28/26 ,  H04W48/10 ,  H04W48/18 ,  H04W72/04 ,  H04W84/18

Abstract: A system and method is provided for incorporating host-device communication in wireless USB (WUSB). A host (101) either uses a multicast Distributed Reservation Protocol (DRP) frame on behalf of connected devices (102) to reserve wireless channel resources, a unicast DRP frame or Enhanced Distributed Channel Access (EDCA) with a Poll Frame. In the case of a unicast DRP frame the number of unicast frames sent for reservation depends on the number of connected devices (102).

Abstract translation: 提供了一种将无线USB（WUSB）中的主机设备通信结合起来的系统和方法。 主机（101）代表连接的设备（102）使用组播分布式预留协议（DRP）帧来保留无线信道资源，单播DRP帧或具有轮询帧的增强型分布式信道访问（EDCA）。 在单播DRP帧的情况下，发送用于预约的单播帧的数量取决于连接的设备的数量（102）。

公开(公告)号：US06715076B1

公开(公告)日：2004-03-30

申请号：US09422737

申请日：1999-10-21

Applicant: Kiran Challapali

Inventor： Kiran Challapali

IPC: H04L912

CPC classification number: H04N21/235 ,  H04N7/162 ,  H04N7/1675 ,  H04N21/435 ,  H04N21/63345

Abstract: A video signal authentication system utilizes selected portions of a video signal to generate authentication codes that are transmitted in association with respective portions of the signal. The video signal preferably is in compressed format and includes synchronizing codes. The data between synchronizing codes preferably is used as discreet portions of the video signal. Each discreet portion is utilized with a selectively known key and a hash-based authentication code generating strategy to generate an authentication code. Each video portion preferably has its own authentication code. The authentication code is appended to the portion of the video signal and transmitted from a first location to the second location. At the second location, the same authentication code generating strategy is performed on the received portion of video data to generate a received authentication code. The transmitted authentication code is then compared to the received authentication code to verify the authenticity of the transmitted portion of the video signal.

Abstract translation: 视频信号认证系统利用视频信号的所选部分产生与信号的相应部分相关联地发送的认证码。 视频信号优选地是压缩格式并且包括同步码。 同步码之间的数据优选地被用作视频信号的离散部分。 利用选择性已知的密钥和基于散列的认证码生成策略来生成每个谨慎部分以生成认证码。 每个视频部分优选地具有其自己的认证码。 验证码被附加到视频信号的部分并从第一位置传送到第二位置。 在第二位置，对视频数据的接收部分执行相同的认证码生成策略，以产生接收到的认证码。 然后将发送的认证码与接收的认证码进行比较，以验证视频信号的发送部分的真实性。

公开(公告)号：US06687294B2

公开(公告)日：2004-02-03

申请号：US09844457

申请日：2001-04-27

Applicant: Yong Yan ,  Kiran Challapali

Inventor： Yong Yan ,  Kiran Challapali

IPC: H04N712

CPC classification number: H04N19/126 ,  H04N19/147 ,  H04N19/154 ,  H04N19/60

Abstract: A video encoder that allows for the selection of a distortion level, comprising: a selection system for selecting a target distortion level; and a system for determining a quantization parameter q that will ensure compliance with the selected target distortion level, wherein the system includes an algorithm for calculating distortion that utilizes a Gaussian distribution having a variance that is a function of the quantization parameter q. The algorithm is based on a distortion model D(q)=N(a1q2+a2q+a3, b1q2+b2q+b3), wherein N is a Gaussian distribution and a1, a2, a3, b1, b2 and b3 are distortion model parameters.

Abstract translation: 一种允许选择失真电平的视频编码器，包括：选择系统，用于选择目标失真电平; 以及用于确定将确保符合所选择的目标失真级别的量化参数q的系统，其中所述系统包括用于计算使用具有作为量化参数q的函数的方差的高斯分布的失真的算法。 该算法基于失真模型D（q）= N（a1q2 + a2q + a3，b1q2 + b2q + b3），其中N是高斯分布，a1，a2，a3，b1，b2 b3是失真模型参数。

公开(公告)号：US6101278A

公开(公告)日：2000-08-08

申请号：US16038

申请日：1998-01-30

Applicant: Yingwei Chen ,  Kiran Challapali ,  Mahesh Balakrishnan

Inventor： Yingwei Chen ,  Kiran Challapali ,  Mahesh Balakrishnan

IPC: H04N7/26 ,  H04N7/30 ,  G06K9/36 ,  H04N7/12

CPC classification number: H04N19/40 ,  H04N19/124 ,  H04N19/126 ,  H04N19/136 ,  H04N19/14 ,  H04N19/172 ,  H04N19/176 ,  H04N19/60 ,  H04N19/85 ,  H04N19/146 ,  H04N19/149 ,  H04N19/15

Abstract: A system extracts, from uncoded video data, coding parameters that correspond substantially to coding parameters used in a coding operation that was previously performed on the video data. The system generates a histogram for at least one AC frequency band in the uncoded video data and calculates a correlation function for the histogram. A maximum value of the correlation function is then identified, and a coding parameter for the at least one AC frequency band is determined using the maximum value of the correlation function.

Abstract translation: 系统从未编码的视频数据中提取与以前对视频数据执行的编码操作中使用的编码参数基本相符的编码参数。 系统为未编码视频数据中的至少一个AC频带生成直方图，并计算直方图的相关函数。 然后识别相关函数的最大值，并且使用相关函数的最大值来确定用于至少一个AC频带的编码参数。