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.

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。

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。

公开(公告)号：US20130013091A1

公开(公告)日：2013-01-10

申请号：US13636236

申请日：2011-03-11

申请人： Dave Cavalcanti ,  Vasanth Gaddam

发明人： Dave Cavalcanti ,  Vasanth Gaddam

IPC分类号： G05B19/00

CPC分类号： H05B37/0272

摘要： Methods and apparatus for a scalable network of heterogeneous devices are disclosed. The network may include segment controllers in communication with a remote management system and a plurality of heterogeneous devices such as, for example, lighting fixture nodes and sensors. The segment controllers may transmit sensor data from the sensors to the remote management system. The segment controllers may also transmit control data to the lighting fixture nodes and, optionally, to one or more supplementary nodes. At least some of the control data may be based on data sent from the remote management system and, optionally, the segment controller may generate at least some of the control data independently of the remote management system.

摘要翻译： 公开了用于可伸缩网络的异构设备的方法和装置。 网络可以包括与远程管理系统和多个异构设备（例如照明器具节点和传感器）通信的段控制器。 分段控制器可以将传感器数据从传感器传送到远程管理系统。 分段控制器还可以将控制数据发送到照明器具节点，并且可选地传送到一个或多个补充节点。 至少一些控制数据可以基于从远程管理系统发送的数据，并且可选地，段控制器可以独立于远程管理系统生成至少一些控制数据。

公开(公告)号：US20080310519A1

公开(公告)日：2008-12-18

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： H04B1/66

CPC分类号： H04L1/0006 ,  H04L1/0025 ,  H04L1/1671 ,  H04L27/2607

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.

摘要翻译： 本发明的系统，装置和方法提供了具有保护间隔的单载波块传输，作为能够进行频域均衡的多径信道上的通信手段，因此具有许多OFDM的优点，但是没有 一些缺点，如高PAPR和高分辨率ADC的需要。 虽然在单载波通信中使用保护间隔可以实现对信号的低复杂度检测，但可以降低带宽效率。 本发明通过自适应地调整保护间隔的长度来提高带宽效率。 此外，通过允许时域和频域均衡，除了提高带宽效率之外，本发明允许在接收机设计中具有极大的灵活性。

公开(公告)号：US07352730B2

公开(公告)日：2008-04-01

申请号：US10524178

申请日：2003-07-31

申请人： Monisha Ghosh ,  Vasanth Gaddam

发明人： Monisha Ghosh ,  Vasanth Gaddam

IPC分类号： H04Q7/24 ,  H03K5/159

CPC分类号： H04L1/20 ,  H04L25/022 ,  H04L25/0228 ,  H04L25/0242 ,  H04L25/025 ,  H04L25/067 ,  H04L27/2647

摘要： A method and system for use in a wireless-local-area network (WLAN), for simultaneously estimating the unknown multi-path channel and noise characteristics and using the channel and noise estimates to improve system performance in the presence of narrowband interferers. Estimates are made for the unknown multi-path channel and noise characteristic without a-priori knowledge of the location of the interference in the band and this information is used to generate soft-metrics for a Viterbi decoder. By using the improved channel and noise estimates, the packet error rate (PER) of an 802.11g WLAN system may be maintained despite collisions with interfering packets thereby allowing the 802.11g system to be less sensitive to the interference.

摘要翻译： 一种在无线局域网（WLAN）中使用的方法和系统，用于同时估计未知多径信道和噪声特性，并使用信道和噪声估计来改善存在窄带干扰源时的系统性能。 对未知的多路径信道和噪声特性进行估计，而无需对频带中的干扰位置的先验知识，并且该信息用于生成维特比解码器的软度量。 通过使用改进的信道和噪声估计，可以保持802.11g WLAN系统的分组错误率（PER），尽管与干扰分组冲突，从而允许802.11g系统对干扰较不敏感。

公开(公告)号：US20060159183A1

公开(公告)日：2006-07-20

申请号：US10562540

申请日：2004-06-28

申请人： Vasanth Gaddam ,  Dagnachew Birru

发明人： Vasanth Gaddam ,  Dagnachew Birru

IPC分类号： H04N7/12

CPC分类号： H04N21/63 ,  H04N21/2383 ,  H04N21/42615 ,  H04N21/4263 ,  H04N21/4382

摘要： A packet formatter for use in a television receiver capable of receiving a dual bitstream signal comprising a standard stream compatible with the Advanced Television Systems Committee (ATSC) standard and a robust stream. The packet formatter comprises: 1) a first processing block capable of receiving the dual bitstream signal and removing therefrom header bits and parity bits associated with the robust stream to thereby produce a first output signal; and 2) a second processing block capable of receiving the first output signal and removing therefrom duplicate bits associated with the robust stream to thereby produce a second output signal that is output from a data path output of the packet formatter.

摘要翻译： 一种用于能够接收双重位流信号的电视接收机的分组格式器，包括与高级电视系统委员会（ATSC）标准兼容的标准流和稳健的流。 分组格式化器包括：1）能够接收双比特流信号并从其去除与鲁棒流相关联的标题比特和奇偶校验位从而产生第一输出信号的第一处理块; 以及2）第二处理块，其能够接收所述第一输出信号并从其中移除与所述鲁棒流相关联的重复位，从而产生从所述分组格式化器的数据路径输出输出的第二输出信号。

公开(公告)号：US20050281294A1

公开(公告)日：2005-12-22

申请号：US10526873

申请日：2003-09-01

申请人： Vasanth Gaddam ,  Dagnachew Birru

发明人： Vasanth Gaddam ,  Dagnachew Birru

IPC分类号： H04N7/26 ,  H04J3/00 ,  H04J3/04 ,  H04N7/24 ,  H04N7/52

CPC分类号： H04N21/2383 ,  H04L1/0057 ,  H04L1/006 ,  H04L1/007 ,  H04L2001/0092 ,  H04N21/4382

摘要： A packet insertion mechanism at the front end of a time-synchronized digital television transmission system multiplexes, along with standard packets, packets whose payload is to be transmitted with redundancy for added robustness. The multiplexer also inputs placeholder packets to accommodate duplicated content of the robust packets. Multiplexing of the robust and placeholder packets is configured to alternate and to interleave with the multiplexing of standard packets. The distribution of the robust packets within a frame is determined by the number of robust packets.

摘要翻译： 时间同步数字电视传输系统前端的分组插入机制与标准分组一起复用其有效负载将被冗余的分组，以增加鲁棒性。 复用器还输入占位符数据包以容纳鲁棒数据包的重复内容。 鲁棒和占位符分组的多路复用被配置为与标准分组的复用交替和交织。 一个帧内的鲁棒数据包的分布由强大的数据包的数量决定。

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）。

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。