公开(公告)号：US08229003B2

公开(公告)日：2012-07-24

申请号：US10533174

申请日：2003-09-05

申请人： Vasanth R. Gaddam ,  Dagnachew Birru

发明人： Vasanth R. Gaddam ,  Dagnachew Birru

IPC分类号： H04N7/18

CPC分类号： H04N21/2383 ,  H04L27/04 ,  H04L2025/03382 ,  H04N21/4382

摘要： Transmission of a digital television signal conveys data parameters along with the encoder data that are utilized by the receiver in equalization and in decoding the encoded data. Leveraging the existing digital television standard data formatting, parameters are split between the two fields of a frame of the interlaced signal. Spread spectrum techniques are employed to robustly convey the parameters in encoded form to the receiver.

摘要翻译： 数字电视信号的传输与数据参数一起传送接收机所使用的编码器数据进行均衡和解码编码数据。 利用现有的数字电视标准数据格式，参数在隔行扫描信号的帧的两个场之间被分割。 采用扩频技术将编码形式的参数鲁棒地传递给接收机。

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：US08503488B2

公开(公告)日：2013-08-06

申请号：US10526873

申请日：2003-09-01

申请人： Vasanth R. Gaddam ,  Dagnachew Birru

发明人： Vasanth R. Gaddam ,  Dagnachew Birru

IPC分类号： H04J3/04

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：US07675994B2

公开(公告)日：2010-03-09

申请号：US10118876

申请日：2002-04-09

申请人： Vasanth R. Gaddam ,  Dagnachew Birru

发明人： Vasanth R. Gaddam ,  Dagnachew Birru

IPC分类号： H04L27/04

CPC分类号： H04N21/2383 ,  H04L1/0041 ,  H04L1/006 ,  H04L1/0065 ,  H04L1/007 ,  H04L27/02 ,  H04N21/4382

摘要： A flexible digital transmission system that improves upon the ATSC A/53 HDTV signal transmission standard. The system includes a digital signal transmitter for generating a first Advanced Television Systems Committee (ATSC) standard encoded 8-VSB bit stream and, for generating an encoded new robust bit stream for transmitting high priority information bits, wherein symbols of the new bit stream are capable of being transmitted according to a transmission mode including: a 2-VSB mode and a 4-VSB transmission mode. 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. The transmission system includes a control mechanism for generating information needed for encoding robust packets at a transmitter device. It also includes a mechanism for encoding control parameters and multiplexes the generated information with the standard and robust bit-streams for transmission. A receiver architecture is additionally provided to decode standard and robust bit-streams transmitted by the transmitter device.

摘要翻译： 灵活的数字传输系统，改进了ATSC A / 53 HDTV信号传输标准。 该系统包括用于产生第一高级电视系统委员会（ATSC）标准编码的8-VSB比特流的数字信号发射机，并且用于产生用于发送高优先级信息比特的编码的新鲁棒比特流，其中新比特流的符号是 能够根据包括2-VSB模式和4-VSB传输模式的传输模式进行传输。 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。 传输系统包括用于产生在发射机设备处对鲁棒分组进行编码所需的信息的控制机制。 它还包括用于编码控制参数的机制，并将所生成的信息与标准和鲁棒的比特流多路复用以进行传输。 另外提供接收机架构来解码由发射机设备发射的标准和鲁棒的比特流。

公开(公告)号：US20100020732A1

公开(公告)日：2010-01-28

申请号：US12441595

申请日：2007-09-21

申请人： Vasanth R. Gaddam ,  Dagnachew Birru

发明人： Vasanth R. Gaddam ,  Dagnachew Birru

IPC分类号： H04L12/28 ,  H04B7/00

CPC分类号： H04B7/2656 ,  H04H20/72 ,  H04N5/50 ,  H04N21/2383 ,  H04N21/2385 ,  H04N21/6131 ,  H04W72/04

摘要： The present invention provides a system (900), apparatus (700, 800) and method for frames, preambles and control headers for a physical (PHY) layer of the 802.22 WRAN specification. Some of the main features of the present invention include: Superframe and Frame structure; Superframe Preamble (and CBP Preamble); Frame Preamble; Superframe Control Header (SCH); and Frame Control Header (FCH).

摘要翻译： 本发明提供了一种用于802.22 WRAN规范的物理（PHY）层的帧，前导码和控制报头的系统（900），装置（700,800）和方法。 本发明的一些主要特征包括：超帧和帧结构; 超帧前缀（和CBP前导码）; 帧前缀; 超帧控制头（SCH）; 和帧控制头（FCH）。

公开(公告)号：US20090323610A1

公开(公告)日：2009-12-31

申请号：US12441610

申请日：2007-09-21

申请人： Vasanth R. Gaddam ,  Dagnachew Birru

发明人： Vasanth R. Gaddam ,  Dagnachew Birru

IPC分类号： H04N7/24 ,  H04W4/00

CPC分类号： H04L5/023 ,  H04L27/0006 ,  H04W16/10 ,  H04W16/14

摘要： A method and system of calculating debt service capacity of a loan applicant includes capturing, indexing, reclassifying and grouping transaction data and profile data of the loan applicant. Next, capturing a loan structure, risk factors, financial variables and reconciliation rules and finally using the aforementioned and loan applicants' data and cash flow projections to calculate loan applicants' debt service capacity with time value of money calculations.

摘要翻译： 贷款申请人偿债能力的计算方法和系统包括对贷款申请人的交易数据和资料数据的采集，索引，重新分类和归类。 接下来，收集贷款结构，风险因素，财务变量和对账规则，最后使用上述和贷款申请人的数据和现金流量预测来计算贷款申请人的债务偿还能力与时间价值计算。

公开(公告)号：US07111221B2

公开(公告)日：2006-09-19

申请号：US10127531

申请日：2002-04-22

申请人： Dagnachew Birru ,  Vasanth R. Gaddam

发明人： Dagnachew Birru ,  Vasanth R. Gaddam

IPC分类号： H03M13/00

CPC分类号： H04N21/4382 ,  H04N21/2383

摘要： A transmission system includes a first forward error correction unit, a robust processor unit, a trellis encoder unit, a second forward error correction unit, and a transmitter device. The first forward error correction unit encodes packets belonging to robust and normal bit streams. The robust processor unit receives the encoded robust packets and processes the robust packets to generate the robust bit stream. The trellis encoder unit produces a stream of trellis encoded data bits corresponding to bits of the normal and robust bit streams by mapping encoded data bits of the robust packets into symbols according to one or more symbol mapping schemes. The second forward error correction unit reads in only packets of the robust bit stream and enables generation of parity bytes only for the robust packets. The transmitter device transmits the robust bit stream over a communications channel to a receiver device.

摘要翻译： 传输系统包括第一前向纠错单元，鲁棒处理器单元，网格编码器单元，第二前向纠错单元和发射机设备。 第一前向纠错单元对属于鲁棒和正常比特流的分组进行编码。 鲁棒的处理器单元接收编码的鲁棒分组并处理鲁棒分组以产生鲁棒的比特流。 网格编码器单元通过根据一个或多个符号映射方案将鲁棒分组的编码数据位映射成符号，产生对应于正常和鲁棒比特流的比特的网格编码数据比特流。 第二前向纠错单元仅读入鲁棒比特流的分组，并且仅允许为鲁棒分组生成奇偶校验字节。 发射机设备通过通信信道将鲁棒比特流发送到接收机设备。

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。