公开(公告)号：US6067118A

公开(公告)日：2000-05-23

申请号：US991521

申请日：1997-12-16

Applicant: Yingwei Chen ,  Kiran Challapali

Inventor： Yingwei Chen ,  Kiran Challapali

IPC: G06T9/00 ,  H04N7/26 ,  H04N7/30

CPC classification number: H04N19/126 ,  H04N19/60 ,  H04N19/124

Abstract: A method of reducing distortion in a video signal by coding a video frame utilizing a quantization matrix specifically determined for the video frame. The method includes the steps of determining the degree to which the video signal is spread about an average value, determining an average quantizer scale-value Q for the video frame, determining a reference weighted distortion for all DCT frequency bands in the video frame, determining the quantization parameter through a normalized distortion function, determining each weight for each DCT frequency band and coding the video frame taking into account the determined weights in the quantization matrix.

Abstract translation: 一种通过使用专门为视频帧确定的量化矩阵对视频帧进行编码来减少视频信号中的失真的方法。 该方法包括以下步骤：确定视频信号关于平均值的扩展程度，确定视频帧的平均量化器比例值Q，确定视频帧中所有DCT频带的参考加权失真，确定 通过归一化失真函数的量化参数，确定每个DCT频带的每个权重，并且考虑到量化矩阵中确定的权重对视频帧进行编码。

公开(公告)号：US09654673B2

公开(公告)日：2017-05-16

申请号：US12160445

申请日：2007-01-16

Applicant: Kiran Challapali ,  Bin Dong ,  Dagnachew Birru

Inventor： Kiran Challapali ,  Bin Dong ,  Dagnachew Birru

IPC: H04N17/00 ,  H04N17/02 ,  H04L7/00 ,  H04N5/08 ,  H04N5/21 ,  H04N5/44 ,  H04N21/426 ,  H04N5/46

CPC classification number: H04N5/08 ,  H04N5/21 ,  H04N5/4401 ,  H04N5/46 ,  H04N21/42607

Abstract: A method for detecting the presence of a television signal embedded in a received signal including the television signal and noise is disclosed. Either first-order or second order cyclostationary property of the signals may be used for their detection. When the first-order cyclostationary property is used, the following method is used, the method comprising the steps of upsampling the received signal by a factor of N, performing a synchronous averaging of a set of M segments of the upsampled received signal, performing an autocorrelation of the signal; and detecting the presence of peaks in the output of the autocorrelation function. When the second order cyclostationary property of the signal is used, the method comprising the steps of delaying the received signal by a fixed delay (symbol time), multiplying the received signal with the delayed version, looking for a tone (single frequency) in the output.

公开(公告)号：US08873470B2

公开(公告)日：2014-10-28

申请号：US12066867

申请日：2006-09-14

Applicant: Carlos Cordeiro ,  Kiran Challapali

Inventor： Carlos Cordeiro ,  Kiran Challapali

IPC: H04W4/00 ,  H04L1/22 ,  H04W16/06 ,  H04W72/04 ,  H04L5/06 ,  H04W76/02 ,  H04W74/00 ,  H04W84/12

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：US20110170512A1

公开(公告)日：2011-07-14

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: H04W72/04

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：US20100246434A1

公开(公告)日：2010-09-30

申请号：US12744409

申请日：2008-11-24

Applicant: JIANFENG WANG ,  KIRAN CHALLAPALI

Inventor： JIANFENG WANG ,  KIRAN CHALLAPALI

IPC: H04L12/26 ,  H04L12/28

CPC classification number: H04W72/044 ,  H04W48/16

Abstract: A device (400) scans and classifies each channel within a spectrum of channels (215-270) as being occupied or unoccupied (255), and, if occupied, whether it is occupied by a primary user (240), a secondary user (230), or an unknown user (260). As a secondary device (400), transmissions are avoided on channels occupied by primary users (490). The device selectively joins an existing network of secondary devices, or establishes a new network on an unoccupied channel (125), based on the quality of service (QoS) that the channel can provide and/or other factors. If the device is paired with a target device (115), the paired device advertises itself on a selected channel (345-360) for a period that is at least as long as the time required to scan all channels, to facilitate discovery in the event that the target device is also in a search mode. The advertising duration randomly alternates (345) among integer multiples of the scan duration.

Abstract translation: 设备（400）扫描并分类频道（215-270）内的每个信道被占用或未被占用（255），并且如果被占用，是否被主用户（240）占用，次用户（ 230）或未知用户（260）。 作为辅助设备（400），在主要用户（490）占用的信道上避免传输。 设备选择性地加入二次设备的现有网络，或者基于信道可以提供的服务质量（QoS）和/或其他因素在未占用信道（125）上建立新网络。 如果设备与目标设备（115）配对，则配对设备在所选频道（345-360）上通告自身的持续时间至少等于扫描所有频道所需的时间，以便于在 目标设备也处于搜索模式的事件。 广告持续时间的整数倍之间随机交替（345）。

公开(公告)号：US07724713B2

公开(公告)日：2010-05-25

申请号：US10597391

申请日：2005-02-02

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

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

IPC: H04W4/00 ,  H04B7/212 ,  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 that includes a super-frame having a slotted Beaconing Period and a data transfer period. The super-frame includes a plurality of medium access slots which are assigned to the slotted Beaconing Period. The Beaconing Period length may be fixed or variable. The Beaconing protocol defines initializing an ad hoc network by means of starting a Beaconing Period, joining an existing Beaconing Period of ad hoc network and resolving collisions during the Beaconing Period.

Abstract translation: 一种分布式MAC协议，包括具有时隙信标周期和数据传送周期的超帧。 超帧包括分配给时隙信标时段的多个媒体接入时隙。 信标期长度可以是固定的或可变的。 信标协议定义了通过启动信标时间段来初始化一个自组织网络，加入现有的信标时代的自组织网络，并在信标期间解决冲突。

公开(公告)号：US07519032B2

公开(公告)日：2009-04-14

申请号：US10314576

申请日：2002-12-09

Applicant: Amjad Soomro ,  Kiran Challapali ,  Javier Del Prado Pavon ,  Saishankar Nandagopalan

Inventor： Amjad Soomro ,  Kiran Challapali ,  Javier Del Prado Pavon ,  Saishankar Nandagopalan

IPC: H04Q7/24

CPC classification number: H04W72/1289 ,  H04W48/08 ,  H04W52/0216 ,  H04W72/042 ,  H04W72/1284 ,  Y02D70/142 ,  Y02D70/168 ,  Y02D70/23

Abstract: An apparatus and method is disclosed for providing a Quality of Service (QoS) service schedule and bandwidth allocation message to a wireless station in a wireless network. The apparatus of the invention comprises a hybrid coordinator that is capable of (1) creating a Quality of Service (QoS) service schedule and a bandwidth allocation message for a wireless station and (2) sending the QoS service schedule and the bandwidth allocation message to the wireless station. The wireless station is capable of using the scheduling information to perform power management by entering a power save mode during times when the hybrid coordinator has not scheduled any transmission opportunities.

Abstract translation: 公开了一种用于向无线网络中的无线站提供服务质量（QoS）服务调度和带宽分配消息的装置和方法。 本发明的装置包括能够（1）为无线站创建服务质量（QoS）服务调度和带宽分配消息的混合协调器，以及（2）将QoS服务调度和带宽分配消息发送到 无线电台。 在混合协调器尚未调度任何传输机会的时间期间，无线站能够使用调度信息来执行功率管理。

公开(公告)号：US20080259895A1

公开(公告)日：2008-10-23

申请号：US10597543

申请日：2005-02-03

Applicant: Joerg Habetha ,  Guido Hiertz ,  Javier Del Prado Pavon ,  Kiran Challapali ,  Sai Shankar Nandagopalan

Inventor： Joerg Habetha ,  Guido Hiertz ,  Javier Del Prado Pavon ,  Kiran Challapali ,  Sai Shankar Nandagopalan

IPC: H04J3/00 ,  H04L12/43 ,  H04Q7/24

CPC classification number: H04W74/04 ,  H04B1/7163 ,  H04W28/26 ,  H04W72/0446 ,  H04W74/002 ,  H04W84/12 ,  H04W84/18 ,  Y02D70/14

Abstract: A system (300), apparatus (301), and method are provided for decentralized medium access control comprising an enhanced protocol for UWB MAC that includes a distributed reservation protocol (DRP) for distributed reservation of the medium (310). The invention also relates to any wireless system (300) that uses a MAC protocol comprising a distributed reservation protocol. The method comprises devices (301) announcing medium reservations in beacons (400) and devices (301) that receive such announcements respecting the reservations.

Abstract translation: 提供了一种用于分散介质访问控制的系统（300），装置（301）和方法，其包括用于UWB MAC的增强协议，其包括用于介质（310）的分布式预留的分布式预留协议（DRP）。 本发明还涉及使用包括分布式预留协议的MAC协议的任何无线系统（300）。 该方法包括通知信标中的媒体预留（400）的装置（301）和接收关于保留的这种通告的装置（301）。

公开(公告)号：US20080253350A1

公开(公告)日：2008-10-16

申请号：US10597388

申请日：2005-01-28

Applicant: Kiran Challapali ,  Stefan Mangold

Inventor： Kiran Challapali ,  Stefan Mangold

IPC: H04J3/00 ,  G06K9/36

CPC classification number: G01S7/021

Abstract: The invention includes a method and device for identifying opportunities to transmit in a radio network. The method and device listen for a first, second, and third period of time to detect first, second, and third busy slots. A processor recognizes a sequence of the first, second, and third busy slots as a function of time, performs a Randomized Hough Transform on the sequence, generates a histogram based on the Randomized Hough Transform, identifies peaks in the histogram, determines whether the peaks correspond to a known radar, and identifies an opportunity to transmit.

Abstract translation: 本发明包括用于识别在无线电网络中传送的机会的方法和装置。 方法和设备监听第一，第二和第三时间段以检测第一，第二和第三忙时隙。 处理器根据时间来识别第一，第二和第三繁忙时隙的序列，对序列执行随机化霍夫变换，基于随机霍夫变换产生直方图，识别直方图中的峰，确定峰的峰值 对应于已知的雷达，并识别发送的机会。

公开(公告)号：US20080253341A1

公开(公告)日：2008-10-16

申请号：US12066860

申请日：2006-09-16

Applicant: Carlos Cordeiro ,  Kiran Challapali

Inventor： Carlos Cordeiro ,  Kiran Challapali

IPC: H04Q7/24

CPC classification number: H04W16/14 ,  H04W72/1257

Abstract: Self-coexistence of first and second wireless communication networks (200) is improved by transmitting a coexistence beacon from a first station (210, 220) of the first wireless communication network (200) to a first station (210, 220) of the second wireless communication network (200. The coexistence beacon includes information about a traffic reservation of the first station (210, 220) of the first wireless communication network (200). The first station (210, 220) of the second wireless communication network (200) may then use this information in a variety of ways to reduce data collisions between the two networks (200). It can communicate this information to a base station (210) of the second wireless communication network (200). The base station (210) of the second wireless communication network (200) can then use this information to more efficiently allocate frequency channels and/or time slots for future traffic reservations of the first station (220) of the second wireless communication network (200).

Abstract translation: 通过将来自第一无线通信网络（200）的第一站（210,220）的共存信标发送到第二无线通信网络（200）的第一站（210,220）来改善第一和第二无线通信网络（200）的自共存 无线通信网络（200）。共存信标包括关于第一无线通信网络（200）的第一站（210,220）的业务预留的信息，第二无线通信网络（200）的第一站（210,220） ）可以以各种方式使用该信息来减少两个网络（200）之间的数据冲突，它可以将该信息传送到第二无线通信网络（200）的基站（210），基站（210） 然后可以使用该信息来更有效地分配用于第一站（220）的未来业务预留的频率信道和/或时隙， 的第二无线通信网络（200）。