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1. 发明授权

US10090963B2 System, apparatus, and method for single-carrier block transmission with adaptive guard interval 有权
公开(公告)号：US10090963B2
公开(公告)日：2018-10-02
申请号：US12096626
申请日：2006-12-05
申请人： Seyed-Alireza Seyedi-Esfahani , Vasanth Gaddam , Dagnachew Birru
发明人： Seyed-Alireza Seyedi-Esfahani , Vasanth Gaddam , Dagnachew Birru
IPC分类号： H04L1/00 , H04L1/16 , H04L27/26
摘要： The system, apparatus and method of the present invention provides a single carrier block transmission with guard interval as a means of communications over multi-path channels that enables frequency domain equalization, and therefore, has many of the advantages of OFDM, but does not have some of the drawbacks such as high PAPR and the need for high resolution ADCs. While the use of guard intervals in single carrier communications enables low complexity detection of the signal, it reduces bandwidth efficiency. The present invention improves the bandwidth efficiency by adjusting the length of the guard interval adaptively. Also, by allowing both time-domain and frequency domain equalizations, besides improving bandwidth efficiency, the inventions allows for great flexibility in receiver design.

2. 发明申请

US20110299509A1 SCHEDULING AND PROTECTION OF QUIET PERIODS IN A QUIET ZONE FOR INCUMBENT SIGNAL DETECTION 有权
标题翻译：调度和保护安全区域进行有害信号检测
公开(公告)号：US20110299509A1
公开(公告)日：2011-12-08
申请号：US13201654
申请日：2010-02-02
申请人： Jianfeng Wang , Vasanth Gaddam
发明人： Jianfeng Wang , Vasanth Gaddam
IPC分类号： H04W72/12
CPC分类号： H04W16/14 , H04W72/1289
摘要： A method and system for scheduling and protecting quiet periods (QP) in a quiet zone (105) for incumbent signal (121) detection in a wireless communications system. The communication system includes a plurality of wireless networks (103, 104), each of the plurality of wireless networks contains at least a master device (101, 401) and a client device (111, 411). In each of the plurality of wireless networks, the master device (101, 401) transmits a beacon (402) that contains a QP schedule (500) and a reservation of a time slot (405) for the client device (411). The client device (111, 411) transmits a request-to-quiet (RTQ) message (412) during the time slot, wherein the RTQ message (412) includes the client device's QP schedule information. The master and client devices within the quiet zone (105) keep quiet during scheduled quiet periods according to the QP schedule information contained in the received beacons and RTQ messages.
摘要翻译：一种用于在无线通信系统中调度和保护安静区（105）中的安全期（QP）用于现有信号（121）检测的方法和系统。通信系统包括多个无线网络（103,104），所述多个无线网络中的每一个至少包含主设备（101,401）和客户端设备（111,411）。在所述多个无线网络中的每一个中，所述主设备（101,401）发送包含所述客户端设备（411）的QP调度（500）和时隙（405）的预留的信标（402）。客户端设备（111,411）在时隙期间发送请求到静默（RTQ）消息（412），其中RTQ消息（412）包括客户端设备的QP调度信息。安静区（105）内的主设备和客户端设备根据接收到的信标和RTQ消息中包含的QP调度信息在安排的安静时段内保持安静。

3. 发明授权

US09178659B2 Techniques for encoding PLCP headers 有权
标题翻译： PLCP头编码技术
公开(公告)号：US09178659B2
公开(公告)日：2015-11-03
申请号：US13254464
申请日：2010-02-25
申请人： Vasanth Gaddam , Monisha Ghosh
发明人： Vasanth Gaddam , Monisha Ghosh
IPC分类号： H04J3/24 , H04L1/00 , H04L27/26
CPC分类号： H04L27/2607 , H04L1/0057 , H04L1/0059 , H04L1/0065 , H04L1/0072
摘要： A method (400) and apparatus for encoding a block-based communication system header. A physical (PHY) layer header and a medium access control (MAC) header of the block-based communication system header are encoded to generate parity bits, wherein the PHY layer header includes at least cyclic prefix (CP) mode bits (S410). Parity bits are appended to the PHY layer header and the MAC layer header to generate a bit vector (S420). The bit vector is divided into at least two data blocks, wherein a first data block includes at least the CP mode bits (S430). A predefined number of tail bits are appended to each data block (S440). The two data blocks are mapped into at least two symbols, wherein the first data block is mapped to a first symbol, such that the first symbol is a first header symbol being transmitted (S450).
摘要翻译：一种用于编码基于块的通信系统报头的方法（400）和装置。对基于块的通信系统头部的物理（PHY）层头部和介质访问控制（MAC）头部进行编码以产生奇偶校验位，其中，PHY层头部至少包括循环前缀（CP）模式比特（S410）。奇偶校验位附加到PHY层报头和MAC层报头以产生位向量（S420）。比特向量被划分为至少两个数据块，其中第一数据块至少包括CP模式比特（S430）。每个数据块附加预定数量的尾比特（S440）。两个数据块被映射到至少两个符号，其中第一数据块被映射到第一符号，使得第一符号是正被发送的第一标题符号（S450）。

4. 发明授权

US09100226B2 Robust sensing of DVB-T/H transmissions in the presence of frequency offsets 有权
标题翻译：在存在频率偏移的情况下对DVB-T / H传输的鲁棒感应
公开(公告)号：US09100226B2
公开(公告)日：2015-08-04
申请号：US13319820
申请日：2010-04-23
申请人： Vasanth Gaddam
发明人： Vasanth Gaddam
IPC分类号： H04L27/12 , H04L27/00 , H04L27/26
CPC分类号： H04L27/0012 , H04L27/2607 , H04L27/2657 , H04L27/2675 , H04L2027/0026
摘要： A method and system is provided for detecting the presence of a DVB (digital video broadcasting) transmission with frequency offsets. The method includes receiving an RF (radio frequency) signal in a selected channel; creating samples from the received RF signal; estimating a frequency offset of the samples; correcting the samples with the estimated frequency offset; correlating the corrected samples with a reference signal; and comparing a correlation result with a threshold value. The frequency offset estimation includes selecting a set of three or more pilots that are boosted continual pilots transmitted at fixed sub-carrier locations in all symbols; transforming the received samples to the frequency domain; determining locations of maxima in the transformed samples, the maxima corresponding to the pilots in the set; and comparing the determined locations with the expected pilot locations in the set.
摘要翻译：提供了一种用于检测具有频率偏移的DVB（数字视频广播）传输的存在的方法和系统。该方法包括在所选择的信道中接收RF（射频）信号; 从接收到的RF信号创建样本; 估计样本的频率偏移; 用估计的频率偏移校正样本; 将校正的样本与参考信号相关; 以及将相关结果与阈值进行比较。频率偏移估计包括选择在所有符号中的固定子载波位置处发送的被提升的连续导频的三个或更多个导频的集合; 将接收的样本转换为频域; 确定变换样本中最大值的位置，与集合中的导频对应的最大值; 以及将确定的位置与该组中的预期导频位置进行比较。

5. 发明授权

US08942336B2 Robust sensing of DVB-T/H transmissions 有权
标题翻译：对DVB-T / H传输的鲁棒感应
公开(公告)号：US08942336B2
公开(公告)日：2015-01-27
申请号：US13319808
申请日：2010-04-23
申请人： Monisha Ghosh , Vasanth Gaddam
发明人： Monisha Ghosh , Vasanth Gaddam
IPC分类号： H04L7/00 , H04N5/44 , H04L27/00 , H04N21/438 , H04N21/61 , H04L5/00
CPC分类号： H04N5/4401 , H04L5/0007 , H04L27/0006 , H04N21/438 , H04N21/6112
摘要： A method and system is provided for detecting the presence of a DVB (digital video broadcasting) transmission. The method includes receiving an RF (radio frequency) signal in a selected channel (1101); creating signal samples from the received RF signal (1102); creating averaged samples from the signal samples, each averaged sample being an average of a predetermined number of signal samples that are separated by a minimum pilot pattern repetition period from one to the next signal sample (1103); correlating the averaged samples with a reference sequence (1104); and comparing a correlation result with a threshold correlation value (1105).
摘要翻译：提供了一种用于检测DVB（数字视频广播）传输的存在的方法和系统。该方法包括在所选择的信道（1101）中接收RF（射频）信号; 从所接收的RF信号（1102）创建信号样本; 从所述信号样本创建平均样本，每个平均样本是由一个到下一个信号样本（1103）的最小导频模式重复周期分隔开的预定数量的信号样本的平均值; 将平均样本与参考序列相关（1104）; 以及将相关结果与阈值相关值（1105）进行比较。

6. 发明授权

US08787324B2 Scheduling and protection of quiet periods in a quiet zone for incumbent signal detection 有权
标题翻译：在安静的区域安排和保护安静的时间段，用于现有的信号检测
公开(公告)号：US08787324B2
公开(公告)日：2014-07-22
申请号：US13201654
申请日：2010-02-02
申请人： Jianfeng Wang , Vasanth Gaddam
发明人： Jianfeng Wang , Vasanth Gaddam
IPC分类号： H04W72/12
CPC分类号： H04W16/14 , H04W72/1289
摘要： A method and system for scheduling and protecting quiet periods (QP) in a quiet zone (105) for incumbent signal (121) detection in a wireless communications system. The communication system includes a plurality of wireless networks (103, 104), each of the plurality of wireless networks contains at least a master device (101, 401) and a client device (111, 411). In each of the plurality of wireless networks, the master device (101, 401) transmits a beacon (402) that contains a QP schedule (500) and a reservation of a time slot (405) for the client device (411). The client device (111, 411) transmits a request-to-quiet (RTQ) message (412) during the time slot, wherein the RTQ message (412) includes the client device's QP schedule information. The master and client devices within the quiet zone (105) keep quiet during scheduled quiet periods according to the QP schedule information contained in the received beacons and RTQ messages.
摘要翻译：一种用于在无线通信系统中调度和保护安静区（105）中的安全期（QP）用于现有信号（121）检测的方法和系统。通信系统包括多个无线网络（103,104），所述多个无线网络中的每一个至少包含主设备（101,401）和客户端设备（111,411）。在所述多个无线网络中的每一个中，所述主设备（101,401）发送包含所述客户端设备（411）的QP调度（500）和时隙（405）的预留的信标（402）。客户端设备（111,411）在时隙期间发送请求到静默（RTQ）消息（412），其中RTQ消息（412）包括客户端设备的QP调度信息。安静区（105）内的主设备和客户端设备根据接收到的信标和RTQ消息中包含的QP调度信息在安排的安静时段内保持安静。

7. 发明申请

US20120050547A1 ROBUST SENSING OF DVB-T/H TRANSMISSIONS IN THE PRESENCE OF FREQUENCY OFFSETS 有权
标题翻译： DVB-T / H传输在频率偏移的存在下的鲁棒感测
公开(公告)号：US20120050547A1
公开(公告)日：2012-03-01
申请号：US13319820
申请日：2010-04-23
申请人： Vasanth Gaddam
发明人： Vasanth Gaddam
IPC分类号： H04N17/00
CPC分类号： H04L27/0012 , H04L27/2607 , H04L27/2657 , H04L27/2675 , H04L2027/0026
摘要： A method and system is provided for detecting the presence of a DVB (digital video broadcasting) transmission with frequency offsets. The method includes receiving an RF (radio frequency) signal in a selected channel (901); creating samples from the received RF signal (902); estimating a frequency offset of the samples (903); correcting the samples with the estimated frequency offset (904); correlating the corrected samples with a reference signal (905); and comparing a correlation result with a threshold value (906). The frequency offset estimation includes selecting a set of three or more pilots that are boosted continual pilots transmitted at fixed sub-carrier locations in all symbols (1001); transforming the received samples to the frequency domain (1002); determining locations of maxima in the transformed samples, the maxima corresponding to the pilots in the set (1003); and comparing the determined locations with the expected pilot locations in the set (1004).
摘要翻译：提供了一种用于检测具有频率偏移的DVB（数字视频广播）传输的存在的方法和系统。该方法包括在所选频道（901）中接收RF（射频）信号; 从所接收的RF信号（902）创建样本; 估计样本的频率偏移（903）; 用估计的频率偏移校正样本（904）; 将校正的样本与参考信号相关（905）; 以及将相关结果与阈值进行比较（906）。所述频率偏移估计包括选择在所有符号（1001）中在固定子载波位置处发送的被提升的连续导频的三个或更多个导频的集合; 将接收的样本变换到频域（1002）; 确定变换样本中最大值的位置，对应于集合中的导频的最大值（1003）; 以及将所确定的位置与所述组中的预期导频位置进行比较（1004）。

8. 发明申请

US20110170512A1 COGNITIVE RADIO DEVICE AND METHOD FOR DETERMINING CHANNEL OCCUPANCY 失效
标题翻译：认知无线电设备及确定通道业务的方法
公开(公告)号：US20110170512A1
公开(公告)日：2011-07-14
申请号：US13119309
申请日：2009-09-03
申请人： Monisha Ghosh , Vasanth Gaddam , Kiran Challapali
发明人： Monisha Ghosh , Vasanth Gaddam , Kiran Challapali
IPC分类号： H04W72/04
CPC分类号： H04W72/04 , H04W16/14 , H04W76/00 , H04W88/08
摘要： 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.
摘要翻译：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）。

9. 发明申请

US20080279293A1 Coded Orthogonal Frequency Division Multiplexing Method and Apparatus 审中-公开
标题翻译：编码正交频分复用方法与装置
公开(公告)号：US20080279293A1
公开(公告)日：2008-11-13
申请号：US12091560
申请日：2006-10-27
申请人： Vasanth Gaddam , Dagnachew Birru
发明人： Vasanth Gaddam , Dagnachew Birru
IPC分类号： H04L27/26 , H04L27/28
CPC分类号： H04L5/0046 , H04L1/0059 , H04L1/0068 , H04L1/0071 , H04L5/0007
摘要： A method and apparatus for transmitting and receiving data via guard tones are described. The information bits are coded by convolutional encoder (101) and some of the punctured bits from punctured (102) are selected with bit selector (105) and subject as the punctured data to interleaving by an interleaver (106-103 for the punctured data-). The OFDM process that follows (104, 107, 108) maps the interleaved selected punctured bits to guard tones and the interleved punctured data to data sub-carriers.
摘要翻译：描述了一种通过保护音发送和接收数据的方法和装置。信息比特由卷积编码器（101）编码，并且用比特选择器（105）选择来自打孔（102）的一些打孔比特，并将其作为穿孔数据进行对象，由交织器（106-103））。接下来的OFDM处理（104,107,108）将交织的选择的删截比特映射到保护音，并将经插入的穿孔数据映射到数据子载波。

10. 发明授权

US09397779B2 Method of packet retransmission and reception and wireless device employing the same 有权
标题翻译：分组重传和接收方法以及采用该方法的无线设备
公开(公告)号：US09397779B2
公开(公告)日：2016-07-19
申请号：US12812640
申请日：2009-01-23
申请人： Vasanth Gaddam , Monisha Ghosh , Jianfeng Wang
发明人： Vasanth Gaddam , Monisha Ghosh , Jianfeng Wang
IPC分类号： H04W40/00 , H04J11/00 , H04B7/00 , H04L27/28 , H04L1/00 , H04L1/18 , H04L5/00
CPC分类号： H04L1/0001 , H04L1/0071 , H04L1/1867 , H04L5/0007 , H04L5/0044
摘要： A first wireless device communicates data to a second wireless device. The first wireless device employs at least one of a first interleaving scheme and a first sub-carrier mapping scheme to produce a first data packet from a first plurality of data bits, and transmits the first data packet to the second wireless device. When the first data packet is not received correctly by the second wireless device, then the first wireless device employs at least one of a second interleaving scheme and a second sub-carrier mapping scheme to create a second data packet from the first plurality of data bits, and transmits the second data packet to the second wireless device.
摘要翻译：第一无线设备将数据传送到第二无线设备。第一无线设备采用第一交织方案和第一子载波映射方案中的至少一个从第一多个数据比特产生第一数据分组，并将第一数据分组发送到第二无线设备。当第二无线设备未正确接收到第一数据分组时，第一无线设备采用第二交织方案和第二子载波映射方案中的至少一个从第一多个数据比特中产生第二数据分组，并将第二数据分组发送到第二无线设备。

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