公开(公告)号：US20070230649A1

公开(公告)日：2007-10-04

申请号：US11731316

申请日：2007-03-29

Applicant: Nabil Yousef ,  Jonathan Min

Inventor： Nabil Yousef ,  Jonathan Min

IPC: H03D1/04

CPC classification number: H04B1/1027

Abstract: A communication device constructed according to the present invention detects impulse noise in a preamble sequence. In detecting impulse noise in the preamble sequence the communication device first receive a preamble sequence that includes a plurality of preamble symbols. The communication device then divides the plurality of preamble symbols by at least one known preamble symbol to produce a plurality of preamble gains and/or a plurality of preamble phases corresponding to the plurality of preamble symbols. Finally, the communication device determines, based upon the plurality of preamble gains and/or the plurality of preamble phases, that at least one preamble symbol has been adversely affected by a impulse noise. The communication device may discard at least one preamble symbol that has been adversely affected by impulse noise from the plurality of preamble symbols. The communication device may combine non-discarded preamble symbols of the plurality of preamble symbols of the preamble sequence to produce a composite result.

Abstract translation: 根据本发明构造的通信设备检测前导序列中的脉冲噪声。 在检测前导码序列中的脉冲噪声时，通信设备首先接收包括多个前导码符号的前同步码序列。 然后，通信设备将多个前导码符号除以至少一个已知的前导码符号，以产生与多个前导码符号相对应的多个前同步码增益和/或多个前同步码相位。 最后，通信设备基于多个前同步码增益和/或多个前同步信号相位确定至少一个前同步码符号已受到脉冲噪声的不利影响。 通信设备可以丢弃已经被来自多个前同步码符号的脉冲噪声不利影响的至少一个前导码符号。 通信设备可以组合前导码序列的多个前同步码符号中的未丢弃的前导码符号以产生复合结果。

公开(公告)号：US20070213018A1

公开(公告)日：2007-09-13

申请号：US11370761

申请日：2006-03-08

Applicant: Aly Ismail ,  Janakan Sivasubramaniam ,  Edward Youssoufian ,  Nabil Yousef ,  Frank Carr

Inventor： Aly Ismail ,  Janakan Sivasubramaniam ,  Edward Youssoufian ,  Nabil Yousef ,  Frank Carr

IPC: H04B1/04

CPC classification number: H03G3/3068 ,  H03G3/3078 ,  H04N5/4401 ,  H04N5/52 ,  H04N21/42607 ,  H04N21/64315

Abstract: Digital autonomous AGC for a DVB-H receiver comprises detecting a plurality of RF signals entering a LNA in the DVB-H receiver; detecting a RF transmitter blocker signal occurring at the LNA; and differentiating between a desired RF signal and an undesired RF transmitter blocker signal by varying a differential gain of current through the LNA. A RF servo loop is used for detecting the RF transmitter blocker signal. Logic circuitry of the RF servo loop is integrated with a baseband AGC loop to step control the differential gain of current through the LNA. A RF wideband detector is used for detecting the plurality of RF signals entering the LNA; and sending a voltage output corresponding to voltage levels of the RF signals to a plurality of comparators, wherein each of the plurality of comparators are set at a different programmable voltage threshold level compared with one another.

Abstract translation: 用于DVB-H接收机的数字自主AGC包括检测在DVB-H接收机中进入LNA的多个RF信号; 检测在LNA处发生的RF发射器阻挡信号; 并且通过改变通过LNA的电流的差分增益来区分期望的RF信号和不期望的RF发射器阻挡信号。 RF伺服环路用于检测RF发射器阻挡信号。 RF伺服环路的逻辑电路与基带AGC环路集成，以逐步控制通过LNA的电流的差分增益。 RF宽带检测器用于检测进入LNA的多个RF信号; 以及将与所述RF信号的电压电平相对应的电压输出发送到多个比较器，其中所述多个比较器中的每一个被设置在彼此不同的可编程电压阈值电平。

公开(公告)号：US07050516B2

公开(公告)日：2006-05-23

申请号：US10391555

申请日：2003-03-20

Applicant: Bruce J. Currivan ,  Thomas J. Kolze ,  Daniel H. Howard ,  Nabil Yousef ,  William Ngai

Inventor： Bruce J. Currivan ,  Thomas J. Kolze ,  Daniel H. Howard ,  Nabil Yousef ,  William Ngai

IPC: H03D1/04 ,  H03D1/06 ,  H03K5/01 ,  H03K6/04

CPC classification number: H04L1/20 ,  H04L1/0003

Abstract: A system for periodic noise avoidance including a timing discriminator receiving an input signal from a communications channel. The input signal includes data packets and empty slots with periodic noise. The timing discriminator outputs a first error measurement of periodic noise width and a second error measurement of periodic noise position. A first loop filter inputs the first error measurement and outputs a width of the empty slots. A second loop filter inputs the second error measurement and outputs a frequency of the periodic noise. An oscillator inputs the width of the empty slots and the frequency, and outputs an empty slot waveform to the timing discriminator.

Abstract translation: 一种用于周期性噪声回避的系统，包括接收来自通信信道的输入信号的定时鉴别器。 输入信号包括具有周期性噪声的数据包和空槽。 定时鉴别器输出周期性噪声宽度的第一误差测量值和周期噪声位置的第二误差测量值。 第一个环路滤波器输入第一个误差测量值，并输出空时隙的宽度。 第二个环路滤波器输入第二个误差测量并输出周期性噪声的频率。 振荡器输入空插槽的宽度和频率，并将空槽波形输出到定时鉴频器。

公开(公告)号：US20050169361A1

公开(公告)日：2005-08-04

申请号：US11090611

申请日：2005-03-25

Applicant: Nabil Yousef ,  Ricardo Merched

Inventor： Nabil Yousef ,  Ricardo Merched

IPC: H04L1/06 ,  H04L25/03 ,  H03K5/159

CPC classification number: H04L1/06 ,  H04L25/03057 ,  H04L2025/0349 ,  H04L2025/03605

Abstract: Directly computing Feed Forward Equalizer (FFE) coefficients and Feed Back Equalizer (FBE) coefficients of a Decision Feedback Equalizer (DFE) from a channel estimate. The FBE coefficients have an energy constraint. A recursive least squares problem is formulated based upon the DFE configuration, the channel estimate, and the FBE energy constraint. The recursive least squares problem is solved to yield the FFE coefficients. The FFE coefficients are convolved with a convolution matrix that is based upon the channel estimate to yield the FBE coefficients. A solution to the recursive least squares problem is interpreted as a Kalman gain vector. A Kalman gain vector solution to the recursive least squares problem may be determined using a Fast Transversal Filter (FTF) algorithm.

Abstract translation: 从信道估计直接计算判决反馈均衡器（DFE）的前馈均衡器（FFE）系数和反馈均衡器（FBE）系数。 FBE系数具有能量约束。 基于DFE配置，信道估计和FBE能量约束来制定递归最小二乘问题。 求解递归最小二乘问题以产生FFE系数。 FFE系数与基于信道估计的卷积矩阵进行卷积以产生FBE系数。 递归最小二乘问题的解决方案被解释为卡尔曼增益向量。 可以使用快速横向滤波器（FTF）算法来确定递归最小二乘问题的卡尔曼增益向量解。

公开(公告)号：US20050141460A9

公开(公告)日：2005-06-30

申请号：US10142189

申请日：2002-05-08

Applicant: Bruce Currivan ,  Thomas Kolze ,  Gottfried Ungerboeck ,  Nabil Yousef

Inventor： Bruce Currivan ,  Thomas Kolze ,  Gottfried Ungerboeck ,  Nabil Yousef

IPC: H04B1/707 ,  H04B7/216 ,  H04J13/00 ,  H04J13/16

CPC classification number: H04B7/216 ,  H04B1/71 ,  H04B1/7102 ,  H04B1/7105 ,  H04B1/7107 ,  H04J13/0003 ,  H04J13/16

Abstract: Cancellation of interference in a communication system with application to S-CDMA. A relatively straight-forward implemented, and computationally efficient approach of selecting a predetermined number of unused codes is used to perform weighted linear combination selectively with each of the input spread signals in a multiple access communication system. If desired, the predetermined number of unused codes is always the same in each implementation. Alternatively, the predetermined number of unused codes are selected from within a reordered code matrix using knowledge that is shared between the two ends of a communication system, such as between the CMs and a CMTS. While the context of an S-CDMA communication system having CMs and a CMTS is used, the solution is generally applicable to any communication system that seeks to cancel narrowband interference. Several embodiments are also described that show the generic applicability of the solution across a wide variety of systems.

Abstract translation: 消除应用于S-CDMA的通信系统中的干扰。 使用选择预定数量的未使用代码的相对简单的实现和计算上有效的方法来在多址通信系统中选择性地与每个输入扩展信号执行加权线性组合。 如果需要，在每个实现中，预定数量的未使用代码总是相同的。 或者，使用在诸如CM和CMTS之间的通信系统的两端之间共享的知识，从重排序代码矩阵中选择预定数量的未使用代码。 虽然使用具有CM和CMTS的S-CDMA通信系统的上下文，但该解决方案通常适用于试图取消窄带干扰的任何通信系统。 还描述了几个实施例，其显示了解决方案在各种系统上的通用适用性。

公开(公告)号：US20050058194A1

公开(公告)日：2005-03-17

申请号：US10956829

申请日：2004-10-01

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04L1/06 ,  H04L25/03 ,  H03K5/159 ,  H04L27/06

CPC classification number: H04L1/06 ,  H04L25/03057 ,  H04L2025/0349 ,  H04L2025/03605

Abstract: Computing optimal Linear Equalizer (LE) coefficients gopt from a channel estimate h. A channel impulse response h is first estimated based upon either a known training sequence or an unknown sequence. The channel estimate is formulated as a convolution matrix H. The convolution matrix H is then related to the LE coefficients in a matrix format equation, the matrix format equation based upon the structure of the LE, the convolution matrix, and an expected output of the LE. A Fast Transversal Filter (FTF) algorithm is then used to formulate a recursive least squares solution to the matrix format equation. Computing the recursive least squares solution yields the LE coefficients using structured equations.

Abstract translation: 从信道估计h计算最优线性均衡器（LE）系数。 首先基于已知训练序列或未知序列来估计信道脉冲响应h。 信道估计被公式化为卷积矩阵H.然后，卷积矩阵H与矩阵格式方程中的LE系数相关，矩阵格式方程基于LE的结构，卷积矩阵和预期的输出 LE。 然后使用快速横向滤波器（FTF）算法为矩阵格式方程式制定递归最小二乘解。 计算递归最小二乘解使用结构化方程得到LE系数。

公开(公告)号：US06256338B1

公开(公告)日：2001-07-03

申请号：US09201185

申请日：1998-11-30

Applicant: Louay Jalloul ,  Nabil Yousef

Inventor： Louay Jalloul ,  Nabil Yousef

IPC: H04L2730

CPC classification number: H04B1/7113 ,  H04B1/7117 ,  H04B7/005 ,  H04B17/364 ,  H04B17/391

Abstract: A method for determining a fading correction factor to be used for correcting a sample of a power delay profile of a received signal in a communication system, the fading correction factor associated with a fading channel characteristic through which the received signal propagates, includes estimating a number (N) of complex samples, obtaining fading channel autocorrelation sequence (R(n)) of the fading channel for a plurality (n) of complex samples, the number of the plurality (n) of complex samples corresponding to the number (N) of complex samples, and computing the fading correction factor based on the number (N) of complex samples, autocorrelation sequence (R(n)), and the number of the plurality (n) of complex samples.

Abstract translation: 一种用于确定用于校正通信系统中的接收信号的功率延迟分布的采样的衰落校正因子的方法，与接收信号传播的衰落信道特性相关联的衰落校正因子包括估计数 （N）的复数样本，获得多个（n）个复数样本的衰落信道的衰落信道自相关序列（R（n）），对应于数目（N）的多个（n）个复数样本的数量， 并且基于复数样本的数量（N），自相关序列（R（n））和多个（n）个复杂样本的数量来计算衰落校正因子。

公开(公告)号：USRE44776E1

公开(公告)日：2014-02-25

申请号：US13645498

申请日：2012-10-04

Applicant: Jun Ma ,  Nabil Yousef

Inventor： Jun Ma ,  Nabil Yousef

IPC: H04L27/00

CPC classification number: H04L27/2657 ,  H04L27/2662 ,  H04L27/2675

Abstract: A technique for estimating a carrier frequency offset and a timing offset in a MediaFLO™ (Forward Link Only) communication system, wherein the method comprises includes receiving Orthogonal Frequency Division Multiplexing (OFDM) symbols; interpolating pilots on odd or even symbols of the received OFDM symbols; determining a phase difference between two successive symbols using the interpolated pilots; obtaining an estimate of the carrier frequency offset and the timing offset from the determined phase difference between two successive symbols; and correcting a sampling frequency in accordance with the estimated carrier frequency offset and timing offset.

Abstract translation: 一种用于估计MediaFLO TM（仅前向链路）通信系统中的载波频率偏移和定时偏移的技术，其中所述方法包括接收正交频分复用（OFDM）符号; 在所接收的OFDM符号的奇数或偶数符号上内插导频; 使用内插导频确定两个连续符号之间的相位差; 从两个连续符号之间确定的相位差获得载波频率偏移和定时偏移的估计; 以及根据估计的载波频率偏移和定时偏移来校正采样频率。

公开(公告)号：US08230462B2

公开(公告)日：2012-07-24

申请号：US12018483

申请日：2008-01-23

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04N5/445 ,  H04N7/173 ,  H04N5/63 ,  G06F3/00

CPC classification number: H04N7/1675 ,  H04N21/23412 ,  H04N21/23895 ,  H04N21/25891 ,  H04N21/26609 ,  H04N21/4384 ,  H04N21/43853 ,  H04N21/4405 ,  H04N21/44209 ,  H04N21/4623 ,  H04N21/4667

Abstract: Enhancing a stream layer transmission for a MediaFLO™ mobile multimedia multicast system comprising a transmitter and a receiver. Code word (CW) computations are performed on a current channel being accessed by the receiver. A favorite channel that a user is statistically mostly likely to switch to on the receiver at any particular time is anticipated. The Overhead Information Symbols (OIS) for each favorite channel is periodically monitored. The receiver remains in a sleep mode while data bursts are received from non-favorite channels, and then wakes up during data bursts of the favorite channel. The same CW computations are performed on the favorite channel as were being performed on the current channel. A cyclic redundancy check (CRC) is performed once the CW computations are performed upon selecting the favorite channel.

Abstract translation: 增强包含发射机和接收机的MediaFLO TM移动多媒体多播系统的流层传输。 在接收器正在访问的当前通道上执行码字（CW）计算。 预计用户在任何特定时间统计上可能在接收器上切换的最喜欢的频道。 定期监控每个喜爱频道的开销信息符号（OIS）。 接收机保持睡眠模式，同时从非收藏频道接收数据突发，然后在喜爱频道的数据突发期间唤醒。 在最喜爱的频道上执行相同的CW计算，正如在当前频道上执行的那样。 一旦选择喜爱的频道执行CW计算，就执行循环冗余校验（CRC）。

公开(公告)号：US08169546B2

公开(公告)日：2012-05-01

申请号：US12033323

申请日：2008-02-19

Applicant: Xiaoyu Fu ,  Jun Ma ,  Waleed M. Younis ,  Nabil Yousef ,  Janakan Sivasubramaniam ,  Edward Youssoufian

Inventor： Xiaoyu Fu ,  Jun Ma ,  Waleed M. Younis ,  Nabil Yousef ,  Janakan Sivasubramaniam ,  Edward Youssoufian

IPC: H04N5/52 ,  H04N3/27 ,  H04N5/00 ,  H04N5/44 ,  H04B1/40 ,  H04B17/02 ,  H04B1/06 ,  H04B7/00 ,  H04B1/26 ,  H04B1/00 ,  H04L27/06 ,  H04L17/08

CPC classification number: H04N5/52 ,  H03G3/001 ,  H03G3/3068 ,  H04N5/4446

Abstract: A technique for providing stable tracking performance to an AGC loop circuit comprises amplifying a wideband radio frequency signal; detecting signals and blockers adjacent to the radio frequency signal; lowering a gain of the radio frequency signal; mixing a local oscillator signal with the radio frequency signal; shifting a frequency of the radio frequency signal from a radio frequency to an intermediate frequency; continuously varying a gain of the intermediate frequency signal; converting the intermediate frequency signal into a digital output signal; comparing the digital output signal with predefined thresholds comprising an upper threshold and a lower threshold; switching a post mixer amplifier (PMA) to a high gain state when an input of a variable gain amplifier (VGA) is greater than the upper threshold, and switching the PMA to a low gain state when an input of the VGA is lower than the lower threshold.

Abstract translation: 一种用于向AGC环路电路提供稳定跟踪性能的技术包括放大宽带射频信号; 检测与射频信号相邻的信号和阻塞; 降低射频信号的增益; 将本地振荡器信号与射频信号混合; 将射频信号的频率从射频转换到中频; 连续地改变中频信号的增益; 将所述中频信号转换为数字输出信号; 将数字输出信号与包括上阈值和下阈值的预定义阈值进行比较; 当可变增益放大器（VGA）的输入大于上阈值时，将后混频器放大器（PMA）切换到高增益状态，并且当VGA的输入低于该阈值时，将PMA切换到低增益状态 较低的门槛。