公开(公告)号：US07970070B2

公开(公告)日：2011-06-28

申请号：US12120505

申请日：2008-05-14

Applicant: Nabil Yousef ,  Jun Ma ,  Yongru Gu

Inventor： Nabil Yousef ,  Jun Ma ,  Yongru Gu

IPC: H04K1/10

CPC classification number: H04L25/03159 ,  H04L25/0216 ,  H04L25/0232 ,  H04L27/2601

Abstract: An apparatus, system, and method of performing adaptive frequency domain equalization in an Orthogonal Frequency Domain Multiplexing (OFDM) based communication system transmitting data information, wherein the method comprises receiving OFDM symbols comprising scattered pilots; obtaining channel estimates on every third bin of the scattered pilots in a frequency domain, wherein the channel estimates are obtained by performing an interpolation in a time domain across the received OFDM symbols; estimating an original channel based on the channel estimates, wherein the original channel in the time domain is estimated by applying a finite impulse response (FIR) low-pass filter in a frequency domain, wherein the FIR low-pass filter is adaptive according to a delay span of an original channel impulse response and is sufficiently wide to cover the delay span of the original channel impulse response; and dividing the received OFDM symbols by the channel estimate to obtain transmitted data information.

Abstract translation: 一种在基于正交频域复用（OFDM）的基于OFDM的通信系统中执行自适应频域均衡的装置，系统和方法，该方法包括：接收包含散射飞行员的OFDM符号; 在频域中获得所述散射导频的每第三个二进制的信道估计，其中所述信道估计是通过在所接收的OFDM符号中的时域执行内插而获得的; 基于信道估计来估计原始信道，其中通过在频域中应用有限脉冲响应（FIR）低通滤波器来估计时域中的原始信道，其中，FIR低通滤波器根据 原始信道脉冲响应的延迟范围，并且足够宽以覆盖原始信道脉冲响应的延迟范围; 并且将所接收的OFDM符号除以信道估计以获得发送的数据信息。

公开(公告)号：US07899140B2

公开(公告)日：2011-03-01

申请号：US11957716

申请日：2007-12-17

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04L27/06

CPC classification number: H04N21/2383 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0216 ,  H04L25/022 ,  H04L25/0222 ,  H04L25/0228 ,  H04N21/4263 ,  H04N21/4382

Abstract: A method for correlating scattered pilot locations in a sequence of OFDM symbols in a multi-carrier transmission system, and includes mapping pilot locations comprising pilot symbols having predetermined known values, wherein the pilot symbols are positioned among data subcarriers in time and frequency dimensions consisting of received pilot symbols and having a predetermined position pattern in the time and frequency dimensions, wherein the predetermined position pattern comprises a finite number of sub-position patterns each corresponding to positions of the pilot symbols; estimating a Doppler spread in a frequency spectrum between the transmitter and the receiver in the multi-carrier transmission system; estimating a channel length of a set of channel paths received at the receiver; and the receiver automatically selecting one of a plurality of predetermined methods of correlating the scattered pilot locations in the sequence of OFDM symbols based only on the estimating processes.

Abstract translation: 一种用于在多载波传输系统中的OFDM符号序列中的分散导频位置相关的方法，并且包括映射导频位置，包括具有预定已知值的导频符号，其中导频符号位于数据子载波中，时间和频率维度由 接收的导频符号并且在时间和频率维度上具有预定的位置模式，其中预定位置模式包括每个对应于导频符号的位置的有限数量的子位置模式; 估计多载波传输系统中的发射机和接收机之间的频谱中的多普勒扩展; 估计在接收机处接收的一组信道路径的信道长度; 并且接收机根据估计过程自动选择使OFDM符号序列中的分散导频位置相关的多个预定方法之一。

公开(公告)号：US07821916B2

公开(公告)日：2010-10-26

申请号：US12062695

申请日：2008-04-04

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04J11/00

CPC classification number: H04L27/2656 ,  H04L27/2613 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2665

Abstract: An apparatus, logic, and method of performing timing and frequency estimation in a MediaFLO™ mobile multimedia multicast system comprising a receiver and a transmitter, wherein the method comprises receiving a wireless data stream comprising a MediaFLO™ mobile multimedia multicast system superframe comprising Orthogonal Frequency Division Multiplexing (OFDM) symbols; estimating a Fast Fourier Transform (FFT) trigger point for each of the received OFDM symbols; estimating a fine carrier frequency offset of each OFDM symbol; determining the start of the MediaFLO™ mobile multimedia multicast system superframe by locating a Time Division Multiplexed (TDM) pilot symbol in the superframe; estimating a coarse carrier frequency offset of each of the received OFDM symbols; and synchronizing the receiver to the start of the MediaFLO™ mobile multimedia multicast system superframe and the transmitted OFDM symbols based on the fine carrier frequency offset, the TDM pilot symbol, and the coarse carrier frequency offset.

Abstract translation: 一种在包括接收机和发射机的MediaFLO TM移动多媒体多播系统中执行定时和频率估计的装置，逻辑和方法，其中所述方法包括接收包括MediaFLO TM移动多媒体多播系统超帧的无线数据流，该超帧包括正交频分 多路复用（OFDM）符号; 估计每个所接收的OFDM符号的快速傅里叶变换（FFT）触发点; 估计每个OFDM符号的精细载波频率偏移; 通过在超帧中定位时分复用（TDM）导频符号来确定MediaFLO TM移动多媒体多播系统超帧的开始; 估计每个所接收的OFDM符号的粗略载波频率偏移; 并且基于精细载波频率偏移，TDM导频符号和粗略载波频率偏移，将接收机同步到MediaFLO TM移动多媒体多播系统超帧的开始和发射的OFDM符号。

公开(公告)号：US07711031B2

公开(公告)日：2010-05-04

申请号：US11766814

申请日：2007-06-22

Applicant: Mirette Sadek ,  Nabil Yousef

Inventor： Mirette Sadek ,  Nabil Yousef

IPC: H04L27/30

CPC classification number: H04L25/0216 ,  H04L1/0047 ,  H04L1/0054 ,  H04L25/0218 ,  H04L25/022 ,  H04L25/0232 ,  H04L25/0236 ,  H04L25/0244 ,  H04L25/03038 ,  H04L25/03286 ,  H04L2025/03414 ,  H04L2025/03496 ,  H04L2025/03522 ,  H04L2025/03617

Abstract: ICI canceling in an OFDM system includes taking a FFT of a wireless electrical signal to produce an OFDM signal; estimating a DC component of a frequency-selective channel in the OFDM system; obtaining an initial estimate of data symbols associated with data bits of the OFDM signal; correcting the data bits with a Viterbi decoder; encoding the corrected data bits to acquire corrected data symbols; re-estimating the DC component of the frequency-selective channel using the corrected data symbols; filtering the corrected data symbols and sub-carrier of the frequency-selective channel; calculating a first order differential function of the frequency-selective channel based on successive ones of the corrected data symbols; removing an ICI component from the calculated first order differential function; and re-estimating the data symbols as a function of the removed ICI component. The filtering occurs using a low pass filter comprising a bank of eight filters.

Abstract translation: OFDM系统中的ICI取消包括对无线电信号进行FFT以产生OFDM信号; 估计所述OFDM系统中的频率选择信道的直流分量; 获得与所述OFDM信号的数据比特相关联的数据符号的初始估计; 用维特比解码器校正数据位; 编码校正的数据位以获取校正的数据符号 使用校正的数据符号重新估计频率选择信道的DC分量; 对频率选择信道的校正数据符号和子载波进行滤波; 基于经校正的数据符号中的连续的一个，计算频率选择信道的一阶微分函数; 从计算的一阶微分函数中去除ICI分量; 并重新估计作为所移除的ICI分量的函数的数据符号。 使用包括八个滤波器组的低通滤波器进行滤波。

公开(公告)号：US07676207B2

公开(公告)日：2010-03-09

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: H04B1/06 ,  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为彼此相差的可编程电压阈值电平。

公开(公告)号：US20090285314A1

公开(公告)日：2009-11-19

申请号：US12120505

申请日：2008-05-14

Applicant: Nabil Yousef ,  Jun Ma ,  Yongru Gu

Inventor： Nabil Yousef ,  Jun Ma ,  Yongru Gu

IPC: H04L27/28

CPC classification number: H04L25/03159 ,  H04L25/0216 ,  H04L25/0232 ,  H04L27/2601

Abstract: An apparatus, system, and method of performing adaptive frequency domain equalization in an Orthogonal Frequency Domain Multiplexing (OFDM) based communication system transmitting data information, wherein the method comprises receiving OFDM symbols comprising scattered pilots; obtaining channel estimates on every third bin of the scattered pilots in a frequency domain, wherein the channel estimates are obtained by performing an interpolation in a time domain across the received OFDM symbols; estimating an original channel based on the channel estimates, wherein the original channel in the time domain is estimated by applying a finite impulse response (FIR) low-pass filter in a frequency domain, wherein the FIR low-pass filter is adaptive according to a delay span of an original channel impulse response and is sufficiently wide to cover the delay span of the original channel impulse response; and dividing the received OFDM symbols by the channel estimate to obtain transmitted data information.

Abstract translation: 一种在基于正交频域复用（OFDM）的基于OFDM的通信系统中执行自适应频域均衡的装置，系统和方法，该方法包括：接收包含散射飞行员的OFDM符号; 在频域中获得所述散射导频的每第三个二进制的信道估计，其中所述信道估计是通过在所接收的OFDM符号中的时域执行内插而获得的; 基于信道估计来估计原始信道，其中通过在频域中应用有限脉冲响应（FIR）低通滤波器来估计时域中的原始信道，其中，FIR低通滤波器根据 原始信道脉冲响应的延迟范围，并且足够宽以覆盖原始信道脉冲响应的延迟范围; 并且将所接收的OFDM符号除以信道估计以获得发送的数据信息。

公开(公告)号：US20090285096A1

公开(公告)日：2009-11-19

申请号：US12120487

申请日：2008-05-14

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: G01R31/08

CPC classification number: H04W80/04 ,  H04L1/0052 ,  H04L12/189 ,  H04L69/12 ,  H04L69/324 ,  H04W4/06 ,  H04W52/0219 ,  Y02D70/00 ,  Y02D70/168

Abstract: Protocol stack layer processing for a MediaFLO™ mobile multimedia multicast system comprising a transmitter comprising a host processor and a host memory component. The processing includes a receiver that receives a wireless data stream comprising a MediaFLO™ mobile multimedia multicast system superframe comprising any of audio, video, and text media frames arranged in multiplexed Multicast Logical Channels (MLCs) and received from the transmitter, wherein each MLC is divided into 16 byte data packets, and wherein each MLC carries up to three logical sub-channels comprising stream 2, stream 1, and stream 0; and an Application Specific Integrated Circuit (ASIC) memory component operatively connected to the receiver, wherein the ASIC memory component performs processing of the data packets using hardware components comprising, a Medium Access Control (MAC) layer core; a stream layer core; a decryption layer core; a defragmentation layer core; and a sync layer core.

Abstract translation: 用于MediaFLO TM移动多媒体多播系统的协议栈层处理，包括包括主处理器和主机存储器组件的发射机。 该处理包括接收器，其接收无线数据流，该无线数据流包括MediaFLO TM移动多媒体多播系统超帧，该超帧包括排列在多路复用多播逻辑信道（MLC）中并从发射机接收的音频，视频和文本媒体帧中的任何一个，其中每个 MLC被分成16字节的数据分组，并且其中每个MLC携带多达三个包括流2，流1和流0的逻辑子信道; 以及可操作地连接到所述接收器的专用集成电路（ASIC）存储器组件，其中所述ASIC存储器组件使用包括媒体访问控制（MAC）层核心的硬件组件来执行所述数据分组的处理; 流层核心; 解密层核心; 碎片整理层核心; 和同步层核心。

公开(公告)号：US20090220015A1

公开(公告)日：2009-09-03

申请号：US12039799

申请日：2008-02-29

Applicant: Xiaoyu Fu ,  Jun Ma ,  Nabil Yousef

Inventor： Xiaoyu Fu ,  Jun Ma ,  Nabil Yousef

IPC: H04K1/10 ,  H04H60/04

CPC classification number: H04L27/2676 ,  H04L27/2659

Abstract: A method of estimating coarse frequency offset of received symbols based on a received frequency domain sample at a kth sub-carrier of a 53rd Orthogonal Frequency Division Multiplexing (OFDM) data symbol in a jth time slot (TS) of a receiver in a China Multimedia Mobile Broadcasting (CMMB) mobile television network includes dividing a received sample, Ykj, into two sets of noise only tones and data plus noise tones Dkj, obtaining a received sample only if there is a coarse frequency offset mismatch between a transmitter and the receiver, dividing a summation of a power of the data plus noise tones by a summation of a power of the noise only tones to obtain Λkj, and estimating an integer coarse frequency offset estimate, Δ{circumflex over (f)}Ij, of the received symbols when the Λkj is a maximum.

Abstract translation: 一种基于中国多媒体接收机的第j个时隙（TS）中第53个正交频分复用（OFDM）数据符号的第k个子载波的接收频域采样来估计接收符号的粗频偏移的方法 移动广播（CMMB）移动电视网络包括将接收到的采样Ykj划分为两组仅噪声的音调和数据加噪声音调Dkj，仅在发射机和接收机之间存在粗略的频率偏移不匹配时才获得接收的采样， 通过仅噪声音调的功率的总和除以数据的加权和噪声音调的和，以获得Lambdakj，并且估计接收符号的整数粗略频率偏移估计值Delta（（f）} Ij） 当Lambdakj是最大值。

公开(公告)号：US20090207311A1

公开(公告)日：2009-08-20

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 ,  H04B1/06

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。

公开(公告)号：US20090187946A1

公开(公告)日：2009-07-23

申请号：US12018483

申请日：2008-01-23

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: G06F3/00 ,  G06F11/07

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: 增强包括发射机和接收机的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）。