公开(公告)号：US20100203911A1

公开(公告)日：2010-08-12

申请号：US12280223

申请日：2007-02-20

申请人： Carlos M. Cordeiro ,  Dagnachew Birru ,  Monisha Ghosh

发明人： Carlos M. Cordeiro ,  Dagnachew Birru ,  Monisha Ghosh

IPC分类号： H04B7/00 ,  H04B15/00

CPC分类号： H04W72/0453 ,  H04W16/28 ,  H04W80/00 ,  H04W88/08

摘要： A Communications base-station configured to operate as a hub in a wireless network and provide communication services to a set of remote customer devices using a wireless protocol is disclosed. The communications base-station includes an antenna array having a plurality of antennae arranged in a fashion as to enable the antenna array to transmit and receive wireless signals in both a substantially omnidirectional and non-omnidirectional pattern, a physical layer (PHY) device coupled to the antenna array and configured to transmit and receive wireless signals and a media access control (MAC) device coupled to the PHY device and configured to direct the antenna array to concurrently provide beamformed wireless signals to a first customer device and omnidirectional wireless signals to second customer device.

摘要翻译： 公开了一种被配置为作为无线网络中的集线器并且使用无线协议向一组远程客户设备提供通信服务的通信基站。 通信基站包括具有多个天线的天线阵列，天线阵列以能够使天线阵列在基本上全向和非全向模式中发射和接收无线信号的方式布置，物理层（PHY）设备耦合到 所述天线阵列并且被配置为发送和接收无线信号，以及媒体访问控制（MAC）设备，其耦合到所述PHY设备并被配置为引导所述天线阵列同时向第一客户设备提供波束形成的无线信号以及向所述第二客户提供全向无线信号 设备。

公开(公告)号：US09014638B2

公开(公告)日：2015-04-21

申请号：US12280223

申请日：2007-02-20

申请人： Carlos M. Cordeiro ,  Dagnachew Birru ,  Monisha Ghosh

发明人： Carlos M. Cordeiro ,  Dagnachew Birru ,  Monisha Ghosh

IPC分类号： H04B1/00 ,  H04W88/08 ,  H04W16/28 ,  H04W80/00

CPC分类号： H04W72/0453 ,  H04W16/28 ,  H04W80/00 ,  H04W88/08

摘要： A Communications base-station configured to operate as a hub in a wireless network and provide communication services to a set of remote customer devices using a wireless protocol is disclosed. The communications base-station includes an antenna array having a plurality of antennae arranged in a fashion as to enable the antenna array to transmit and receive wireless signals in both a substantially omnidirectional and non-omnidirectional pattern, a physical layer (PHY) device coupled to the antenna array and configured to transmit and receive wireless signals and a media access control (MAC) device coupled to the PHY device and configured to direct the antenna array to concurrently provide beamformed wireless signals to a first customer device and omnidirectional wireless signals to second customer device.

摘要翻译： 公开了一种通信基站，被配置为作为无线网络中的集线器并且使用无线协议向一组远程客户设备提供通信服务。 通信基站包括具有多个天线的天线阵列，天线阵列以能够使天线阵列在基本上全向和非全向模式中发射和接收无线信号的方式布置，物理层（PHY）设备耦合到 所述天线阵列并且被配置为发送和接收无线信号，以及媒体访问控制（MAC）设备，其耦合到所述PHY设备并被配置为引导所述天线阵列同时向第一客户设备提供波束形成的无线信号以及向所述第二客户提供全向无线信号 设备。

公开(公告)号：US07206352B2

公开(公告)日：2007-04-17

申请号：US10078933

申请日：2002-02-19

申请人： Dagnachew Birru ,  Vasanth R. Gaddam ,  Monisha Ghosh

发明人： Dagnachew Birru ,  Vasanth R. Gaddam ,  Monisha Ghosh

IPC分类号： H04L23/02 ,  H04L5/12

CPC分类号： H04L1/007 ,  H04L1/0059 ,  H04N19/89 ,  H04N21/2383 ,  H04N21/4382 ,  H04N21/631

摘要： This disclosure describes a flexible digital transmission system that improves upon the ATSC A/53 HDTV signal transmission standard. The system includes a digital television signal transmitter for generating a first Advanced Television Systems Committee (ATSC) standard 8-VSB bit stream and, for generating an encoded new bit stream capable of transmitting high priority information bits, wherein symbols of the new bit stream are capable of being transmitted according to a transmission mode selected from group comprising: a 2-VSB mode, a 4-VSB mode, and a hierarchical-VSB (H-VSB) transmission mode. Each respective 2-VSB, 4-VSB, and H-VSB mode is characterized as having symbols mapped according to possible symbol values from an alphabet comprising respectively, {−7, −5, 5, 7}, {7, 3, −3, −7}, and {7, 5, 3, −3, −5, −7}. The standard 8-VSB bit stream and new bit stream may be simultaneously transmitted over a terrestrial channel according to a broadcaster defined bit-rate ratio.

摘要翻译： 本公开描述了一种改进了ATSC A / 53 HDTV信号传输标准的灵活数字传输系统。 该系统包括用于产生第一高级电视系统委员会（ATSC）标准8-VSB比特流的数字电视信号发射机，用于产生能够发送高优先级信息比特的编码新比特流，其中新比特流的符号是 能够根据从包括2-VSB模式，4-VSB模式和分级VSB（H-VSB）传输模式的组中选择的传输模式进行传输。 每个相应的2-VSB，4-VSB和H-VSB模式的特征在于具有根据分别由{-7,5 -5,7}，{7,3，...， 3，-7}和{7，5，3，-3，-5，-7}。 标准8-VSB比特流和新比特流可以根据广播器定义的比特率比率通过地面信道同时发送。

公开(公告)号：US08155141B2

公开(公告)日：2012-04-10

申请号：US12280000

申请日：2007-02-20

申请人： Carlos M. Cordeiro ,  Kiran S. Challapali ,  Dagnachew Birru

发明人： Carlos M. Cordeiro ,  Kiran S. Challapali ,  Dagnachew Birru

IPC分类号： H04L12/43 ,  H04J3/16

CPC分类号： H04W72/082 ,  H04W16/14 ,  H04W72/0413

摘要： The present invention is a system (1200), base station (1100)/customer premise equipment (1150) apparatus, and method (400 450) for a two-stage quiet-period management mechanism that provides the required protection to incumbents (primary spectrum users) while supporting the desired QoS of secondary users participating in a cognitive radio network. In the first stage, a simple fast sensing (301) is done (e.g., energy detection) by all devices in the network. Depending on the result of the fast sensing, the second and possibly longer stage, herein termed fine sensing (302), is performed.

摘要翻译： 本发明是一种用于两阶段安静期管理机制的系统（1200），基站（1100）/客户驻地设备（1150）装置和方法（400 450），其为现任者提供所需的保护（主频谱 用户），同时支持参与认知无线电网络的次要用户的期望QoS。 在第一阶段，由网络中的所有设备完成简单的快速感测（301）（例如，能量检测）。 根据快速感测的结果，执行第二可能更长的阶段，这里称为精细感测（302）。

公开(公告)号：US09577863B2

公开(公告)日：2017-02-21

申请号：US12522932

申请日：2008-01-15

申请人： Dagnachew Birru ,  Seyed-Alireza Seyedi-Esfahani

发明人： Dagnachew Birru ,  Seyed-Alireza Seyedi-Esfahani

IPC分类号： H04B1/38 ,  H04N7/167 ,  H04L27/26 ,  H04B1/62 ,  H04L5/00

CPC分类号： H04L27/2657 ,  H04B1/62 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/2607 ,  H04L27/2692

摘要： A single carrier modulation scheme suitable for use in high frequency communication systems is provided that achieves improved residual frequency error and phase noise estimation. At a transmitter, cyclically orthogonal constant amplitude pilot signals are inserted at the beginning (or end) of a plurality of SCBT blocks of a block coded data stream. At a receiver, a phase rotation of the received data stream is determined to remove a residual frequency error or to estimate the phase noise.

摘要翻译： 提供了适用于高频通信系统的单载波调制方案，其实现了改进的残余频率误差和相位噪声估计。 在发射机处，在块编码数据流的多个SCBT块的开始（或结束）处插入循环正交的恒定幅度导频信号。 在接收机处，确定接收数据流的相位旋转以消除残余频率误差或估计相位噪声。

公开(公告)号：US09137805B2

公开(公告)日：2015-09-15

申请号：US12066887

申请日：2006-09-14

申请人： Carlos Cordeiro ,  Dagnachew Birru

发明人： Carlos Cordeiro ,  Dagnachew Birru

IPC分类号： H04W4/00 ,  H04W72/06

CPC分类号： H04W72/06

摘要： A plurality of MAC/PHY stacks is adapted to support wireless devices. A superframe structure includes a preamble and a superframe initialization header.

摘要翻译： 多个MAC / PHY堆栈适于支持无线设备。 超帧结构包括前同步码和超帧初始化头。

公开(公告)号：US08630363B2

公开(公告)日：2014-01-14

申请号：US12447491

申请日：2007-10-25

申请人： Seyed-Alireza Seyedi-Esfahani ,  Dagnachew Birru

发明人： Seyed-Alireza Seyedi-Esfahani ,  Dagnachew Birru

IPC分类号： H04L5/12 ,  H04L23/02

CPC分类号： H04L1/0041 ,  H04L1/0054 ,  H04L1/006 ,  H04L1/0071 ,  H04L25/03159 ,  H04L25/03203 ,  H04L27/186 ,  H04L27/3416

摘要： The system (900), transmitter (700), receiver (800.a 800.b), and method of the present invention provide a technique to code data bits into symbols using TCM, MLCM or BIMLCM before the symbols are placed in an SCBT block. Generally, TCM, MLCM, and BIMLCM do not have good performance over the frequency selective channels. However, since the frequency domain equalization of SCBT will flatten the channel, the use of TCM, MLCM and BIMLCM can provide significant gain. Furthermore, since some of the bits are left uncoded, the speed requirements on the encoder and decoder can be relaxed. This feature is especially important for the very high data rate systems.

摘要翻译： 本发明的系统（900），发射机（700），接收机（800.a800.b）和方法提供了一种技术，在将符号放置在SCBT中之前，使用TCM，MLCM或BIMLCM将数据比特编码成符号 块。 通常，TCM，MLCM和BIMLCM在频率选择性通道上的性能不佳。 然而，由于SCBT的频域均衡将使通道平坦化，所以使用TCM，MLCM和BIMLCM可以提供显着的增益。 此外，由于某些位未编码，可以放宽对编码器和解码器的速度要求。 该特性对于非常高的数据速率系统尤为重要。

公开(公告)号：US08418035B2

公开(公告)日：2013-04-09

申请号：US12522967

申请日：2008-01-17

申请人： Dagnachew Birru ,  Seyed-Alireza Seyedi-Esfahani ,  Richard Chen ,  Hong Zhai ,  Chun-Ting Chou

发明人： Dagnachew Birru ,  Seyed-Alireza Seyedi-Esfahani ,  Richard Chen ,  Hong Zhai ,  Chun-Ting Chou

IPC分类号： H03M13/00

CPC分类号： H04L1/0071 ,  H04L1/0043 ,  H04L1/0052

摘要： A Single Carrier Block Transmission (SCBT) system employs an inherently parallel approach to error correction processing. At the transmission system (200), an incoming data stream is split (210) into P parallel data streams, each having a data rate equal to a fraction of the incoming data stream's data rate. The parallel data streams are then each separately encoded (220) in P parallel encoding processes (beneficially, using P parallel encoders (222)). The P separately encoded data streams are then merged (330), interleaved (320), and mapped (310) into a single stream of encoded symbols, which are transmitted to the receiver using an arbitrary modulation (240) and transmission scheme. At the receiver (255), the received data stream is de-interleaved (350) and split into P encoded data streams, which are then decoded (285) using P parallel decoders. Then, the decoded data streams are combined or multiplexed (295) into a single data stream.

摘要翻译： 单载波块传输（SCBT）系统采用固有的并行方法进行纠错处理。 在传输系统（200）处，输入数据流被分离（210）为P个并行数据流，每个数据流的数据速率等于输入数据流的数据速率的一小部分。 然后，并行数据流在P个并行编码处理（有利地，使用P个并行编码器（222））中分别编码（220）。 然后将P个分离编码的数据流合并（330），交织（320）和映射（310）到编码符号​​的单个流中，其使用任意调制（240）和传输方案发送到接收机。 在接收机（255）处，对接收到的数据流进行解交织（350）并分割成P个编码数据流，然后使用P个并行解码器解码（285）。 然后，解码的数据流被组合或多路复用（295）到单个数据流中。

公开(公告)号：US08233566B2

公开(公告)日：2012-07-31

申请号：US12301304

申请日：2007-05-17

申请人： Dagnachew Birru

发明人： Dagnachew Birru

IPC分类号： H04L27/00

CPC分类号： H04B1/719

摘要： A system (100) and method (300) detect the presence of a narrowband signal having a bandwidth ΔF2 in a wideband frequency channel having a bandwidth ΔF1>ΔF2. The method (300) includes digitizing (310) a signal received in the frequency channel; transforming (320) the digitized signal into N digital frequency domain components; averaging (330) the power spectrum of the N digital frequency domain components over a plurality of samples; filtering (340) the averaged power spectrum of the N digital frequency domain components with a filter having M non-zero values spanning a bandwidth, ΔF3, where N>M and ΔF1>ΔF3; computing (350) a mean, μk, a modified standard deviation, βk, and a peak value, PMAX of the filtered, averaged power; and detecting (360) the presence of the narrowband whenever PMAX>(k1*μk)+(k2*βk), where k1 and k2 are selected to provide a probability of detection, a probability of missed detection, and a probability of false alarm.

摘要翻译： 系统（100）和方法（300）在具有带宽＆Dgr; F1>＆Dgr; F2的宽带频道中检测具有带宽＆Dgr; F2的窄带信号的存在。 方法（300）包括数字化（310）在频率信道中接收的信号; 将（320）数字化信号转换成N个数字频域分量; 在多个样本中平均（330）N个数字频域分量的功率谱; 滤波（340）具有M个非零值的滤波器的N个数字频域分量的平均功率谱，跨越带宽＆Dgr; F3，其中N> M和＆Dgr; F1>＆Dgr; F3; 计算（350）平均值μk，修正的标准偏差＆bgr; k和滤波平均功率的峰值PMAX; 并且每当PMAX>（k1 *μk）+（k2 *＆bgr; k）选择k1和k2以提供检测的概率，错过检测的概率和概率为 虚惊。

公开(公告)号：US08233415B2

公开(公告)日：2012-07-31

申请号：US12132868

申请日：2008-06-04

申请人： Dagnachew Birru

发明人： Dagnachew Birru

IPC分类号： H04B7/00

CPC分类号： H04J13/0059

摘要： A method for generating preamble structures to be used in multi-mode wireless communication systems. The method includes generating a basic element sequence in a predefined length, wherein the basic element sequence has a circularly orthogonal property; generating a type-A preamble by repeating the basic element sequence a number of predefined times; and generating a type-B preamble by adding respective values of real parts to values of imaginary parts of elements in the type-A preamble. The type-A preamble and type-B preamble are cross-correlated.

摘要翻译： 一种用于产生要在多模式无线通信系统中使用的前导码结构的方法。 该方法包括以预定长度生成基本元素序列，其中基本元素序列具有圆形正交属性; 通过重复基本元素序列多个预定义时间来生成A类前导码; 并且通过将实部的相应值添加到类型-A前同步码中的元素的虚部的值来生成类型B前同步码。 A型前同步码和B型前同步码是相互关联的。