公开(公告)号：US20080002794A1

公开(公告)日：2008-01-03

申请号：US11750471

申请日：2007-05-18

申请人： Mark Wallace ,  John Ketchum ,  J. Walton ,  Steven Howard

发明人： Mark Wallace ,  John Ketchum ,  J. Walton ,  Steven Howard

IPC分类号： H04B1/10

CPC分类号： H04W52/42 ,  H04L27/2613 ,  H04L27/2659 ,  H04L27/266 ,  H04W52/286

摘要： Techniques for performing acquisition of packets are described. First detection values may be determined based on a first plurality of samples, e.g., by performing delay-multiply-integrate on the samples. Power values may be determined based on the first plurality of samples, e.g., by performing multiply-integrate on the samples. The first detection values may be averaged to obtain average detection values. The power values may also be averaged to obtain average power values. Whether a packet is presence may be determined based on the average detection values and the average power values. Second detection values may be determined based on a second plurality of samples. The start of the packet may be determined based on the first and second detection values. A third detection value may be determined based on a third plurality of samples. Frequency error of the packet may be estimated based on the first and third detection values.

摘要翻译： 描述用于执行分组获取的技术。 可以基于第一多个样本来确定第一检测值，例如通过对样本执行延迟乘法积分。 功率值可以基于第一多个样本来确定，例如通过对样本进行乘法积分。 可以对第一检测值进行平均以获得平均检测值。 功率值也可以被平均以获得平均功率值。 可以基于平均检测值和平均功率值来确定分组是否存在。 可以基于第二多个样本来确定第二检测值。 分组的开始可以基于第一和第二检测值来确定。 可以基于第三多个样本来确定第三检测值。 可以基于第一和第三检测值来估计分组的频率误差。

公开(公告)号：US20070207909A1

公开(公告)日：2007-09-06

申请号：US11368980

申请日：2006-03-06

申请人： Dave Whitten ,  John Ketchum

发明人： Dave Whitten ,  John Ketchum

IPC分类号： B31F1/00

CPC分类号： B65H45/163 ,  B65H2301/44314

摘要： A folder includes a cylinder having a first gripping device receiving a folded edge of a signature and rotating the signature at a first surface speed. A conveyor presses the signature against the outer surface and the conveyor contacts the signatures at a second surface speed slower than the first surface speed. The present invention also provides a method for removing signatures from a cylinder.

摘要翻译： 文件夹包括具有接收签名的折叠边缘的第一夹持装置并以第一表面速度旋转签名的圆柱体。 输送机将签名器压靠在外表面上，并且输送机以比第一表面速度慢的第二表面速度接触签名。 本发明还提供一种从圆筒移除签名的方法。

公开(公告)号：US20060274849A1

公开(公告)日：2006-12-07

申请号：US11500852

申请日：2006-08-07

申请人： John Ketchum ,  Mark Wallace ,  Steven Howard ,  Jay Walton

发明人： John Ketchum ,  Mark Wallace ,  Steven Howard ,  Jay Walton

IPC分类号： H04L1/02

CPC分类号： H04B7/0617 ,  H04B7/0413 ,  H04B7/0443 ,  H04B7/0854 ,  H04L25/0204 ,  H04L25/0212 ,  H04L25/0248 ,  H04L25/03057 ,  H04L27/2608

摘要： Techniques for processing a data transmission at the transmitter and receiver. In an aspect, a time-domain implementation is provided which uses frequency-domain singular value decomposition and “water-pouring” results to derive time-domain pulse-shaping and beam-steering solutions at the transmitter and receiver. The singular value decomposition is performed at the transmitter to determine eigen-modes (i.e., spatial subchannels) of the MIMO channel and to derive a first set of steering vectors used to “precondition” modulation symbols. The singular value decomposition is also performed at the receiver to derive a second set of steering vectors used to precondition the received signals such that orthogonal symbol streams are recovered at the receiver, which can simplify the receiver processing. Water-pouring analysis is used to more optimally allocate the total available transmit power to the eigen-modes, which then determines the data rate and the coding and modulation scheme to be used for each eigen-mode.

公开(公告)号：US20060274844A1

公开(公告)日：2006-12-07

申请号：US11471415

申请日：2006-06-19

申请人： J. Walton ,  John Ketchum ,  Mark Wallace ,  Steven Howard

发明人： J. Walton ,  John Ketchum ,  Mark Wallace ,  Steven Howard

IPC分类号： H04K1/10

CPC分类号： H04L1/0002 ,  H04B7/0417 ,  H04B7/0617 ,  H04L25/0206 ,  H04L25/0212 ,  H04L25/0242 ,  H04L27/2647

摘要： Frequency-independent eigensteering in MISO and MIMO systems are described. For principal mode and multi-mode eigensteering, a correlation matrix is computed for a MIMO channel based on channel response matrices and decomposed to obtain NS frequency-independent steering vectors for NS spatial channels of the MIMO channel. ND data symbol streams are transmitted on ND best spatial channels using ND steering vectors, where ND=1 for principal mode eigensteering and ND>1 for multi-mode eigensteering. For main path eigensteering, a data symbol stream is transmitted on the best spatial channel for the main propagation path (e.g., with the highest energy) of the MIMO channel. For receiver eigensteering, a data symbol stream is steered toward a receive antenna based on a steering vector obtained for that receive antenna. For all eigensteering schemes, a matched filter is derived for each receive antenna based on the steering vector(s) and channel response vectors for the receive antenna.

摘要翻译： 描述MISO和MIMO系统中与频率无关的本征导向。 对于主模式和多模式特征向导，基于信道响应矩阵针对MIMO信道计算相关矩阵，并且对其进行分解，以获得N S S / N N的非频率无关导向向量 > MIMO信道的空间信道。 N N个数据符号流使用N D D个导向矢量在N N D个最佳空间信道上发送，其中N N D = 1用于主模式本征转向，N 1 > 1用于多模特征转向。 对于主路径特征导向，在用于主要传播路径（例如，具有最高能量）的MIMO信道的最佳空间信道上发送数据符号流。 对于接收机本征导向，基于为该接收天线获得的导向向量，将数据符号流转向接收天线。 对于所有特征导向方案，基于接收天线的导向矢量和信道响应向量，为每个接收天线导出匹配滤波器。

公开(公告)号：US20060116155A1

公开(公告)日：2006-06-01

申请号：US11330733

申请日：2006-01-11

申请人： Irina Medvedev ,  Jay Walton ,  John Ketchum

发明人： Irina Medvedev ,  Jay Walton ,  John Ketchum

IPC分类号： H04B7/00 ,  H04Q7/20

CPC分类号： H04W52/346 ,  H04B7/0443 ,  H04W24/00 ,  H04W52/241 ,  H04W52/267 ,  H04W52/50 ,  H04W72/00

摘要： Techniques to allocate the total transmit power to the transmission channels in a multi-channel communication system such that higher overall system spectral efficiency and/or other benefits may be achieved. The total transmit power may be initially allocated to the transmission channels based on a particular power allocation scheme (e.g., the water-filling scheme). The initial allocation may result in more power being allocated to some transmission channels than needed to achieve the required SNR (e.g., the SNR needed to achieve the maximum allowed data rate), which would then result in these transmission channels being operated in the saturation region. In such situations, the techniques reallocate the excess transmit power of transmission channels operated in the saturation region to other transmission channels operated below the saturation region. In this way, higher data rate may be achieved for the “poorer” transmission channels without sacrificing the performance of the “better” transmission channels.

公开(公告)号：US20050237920A1

公开(公告)日：2005-10-27

申请号：US10830907

申请日：2004-04-22

申请人： Steven Howard ,  John Ketchum ,  Mark Wallace ,  Peter Monsen ,  J. Walton

发明人： Steven Howard ,  John Ketchum ,  Mark Wallace ,  Peter Monsen ,  J. Walton

IPC分类号： H04J99/00 ,  H04B7/04 ,  H04B7/06 ,  H04L25/02 ,  H04L25/03 ,  H04J11/00

CPC分类号： H04B7/0615 ,  H04B7/0413

摘要： A matrix {circumflex over (V)} of eigenvectors is derived using an iterative procedure. For the procedure, an eigenmode matrix Vi is first initialized, e.g., to an identity matrix. The eigenmode matrix Vi is then updated based on a channel response matrix {circumflex over (H)} for a MIMO channel to obtain an updated eigenmode matrix Vi+1. The eigenmode matrix may be updated for a fixed or variable number of iterations. The columns of the updated eigenmode matrix may be orthogonalized periodically to improve performance and ensure stability of the iterative procedure. In one embodiment, after completion of all iterations, the updated eigenmode matrix for the last iteration is provided as the matrix {circumflex over (V)}.

摘要翻译： 使用迭代过程导出特征向量的矩阵{circumflex over（ V）}。 对于该过程，本征模式矩阵 V I i首先被初始化，例如，到单位矩阵。 然后，基于MIMO信道的信道响应矩阵（对于（ H）}来更新本征模式矩阵 V 更新的本征模式矩阵 V i + 1 。 可以针对固定或可变数量的迭代更新本征模式矩阵。 更新的本征模式矩阵的列可以周期性地正交化以提高性能并确保迭代过程的稳定性。 在一个实施例中，在完成所有迭代之后，用于最后迭代的更新的本征模式矩阵被提供为矩阵{circumflex over（ V）}。