公开(公告)号：US20090041135A1

公开(公告)日：2009-02-12

申请号：US11834712

申请日：2007-08-07

Applicant: Mahmoud H. Ismail ,  Waleed Younis ,  Maged F. Barsoum ,  Nabil Yousef

Inventor： Mahmoud H. Ismail ,  Waleed Younis ,  Maged F. Barsoum ,  Nabil Yousef

IPC: H04L27/28

CPC classification number: H04L27/2656 ,  H04L27/2678

Abstract: Detecting Null symbols in a video data frame comprises sending OFDM symbols through a sliding windowed correlation process having a correlation window length proportional to a cyclic prefix length and a delay equal to a FFT size of the symbols, wherein output peaks of the process occur where two similar portions of the symbols coincide; checking peaks in windows sized equal to a duration of a symbol; determining whether the peaks are located in the middle of the windows; determining whether a shift has occurred in the location of the peak of a current window compared to in a second immediately previous window; determining whether the peak in a first immediately previous window is weak compared to that in a second immediately previous window; and declaring that a Null symbol exists in the first previous window when the shift has occurred and the determination of a weak peak exists.

Abstract translation: 检测视频数据帧中的空符号包括通过具有与循环前缀长度成比例的相关窗口长度和等于符号的FFT大小的延迟的滑动窗口相关处理来发送OFDM符号，其中过程的输出峰值发生在两个 符号的相似部分重合; 检查窗口大小等于符号持续时间的峰值; 确定峰是否位于窗的中间; 确定当前窗口的峰值位置与第二个紧接在前的窗口相比是否发生位移; 确定在第一紧邻前一窗口中的峰值是否比在第二紧接的前一窗口中的峰值弱; 并且当发生移位并且存在弱峰值的确定时，声明在第一先前窗口中存在空符号。

公开(公告)号：US20080317153A1

公开(公告)日：2008-12-25

申请号：US11766814

申请日：2007-06-22

Applicant: Mirette Sadek ,  Nabil Yousef

Inventor： Mirette Sadek ,  Nabil Yousef

IPC: H04J11/00 ,  H04L23/02

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：US07447980B2

公开(公告)日：2008-11-04

申请号：US11251721

申请日：2005-10-17

Applicant: Bin Xu ,  Nabil Yousef

Inventor： Bin Xu ,  Nabil Yousef

IPC: H03M13/00

CPC classification number: H03M13/1515 ,  H03M13/09 ,  H03M13/154 ,  H03M13/2906 ,  H03M13/2915 ,  H03M13/293 ,  H03M13/2948 ,  H03M13/373 ,  H03M13/6541

Abstract: A system and method of using recursive cyclic redundancy check (CRC)+forward error correction (FEC) for enhancing the channel coding gain for a DVB-H receiver, and using a physical (PHY) Reed-Solomon (RS) decoder+FEC to achieve better coding gain. The system and method utilize a dual mode RS decoder (erasure mode and error mode) for FEC decoding. The PHY RS is used to provide smaller granularity for FEC. The system includes a cache memory management scheme for implementing the recursive CRC/RS+FEC in very large scale integrated circuit chip (VLSI) hardware.

Abstract translation: 一种使用递归循环冗余校验（CRC）+前向纠错（FEC）的系统和方法，用于增强DVB-H接收机的信道编码增益，并使用物理（PHY）里德 - 所罗门（RS）解码器+ FEC 实现更好的编码增益。 该系统和方法利用双模式RS解码器（擦除模式和错误模式）进行FEC解码。 PHY RS用于为FEC提供较小的粒度。 该系统包括用于在超大规模集成电路芯片（VLSI）硬件中实现递归CRC / RS + FEC的高速缓冲存储器管理方案。

公开(公告)号：US20070089038A1

公开(公告)日：2007-04-19

申请号：US11251721

申请日：2005-10-17

Applicant: Bin Xu ,  Nabil Yousef

Inventor： Bin Xu ,  Nabil Yousef

IPC: H03M13/00

CPC classification number: H03M13/1515 ,  H03M13/09 ,  H03M13/154 ,  H03M13/2906 ,  H03M13/2915 ,  H03M13/293 ,  H03M13/2948 ,  H03M13/373 ,  H03M13/6541

Abstract: A system and method of using recursive cyclic redundancy check (CRC)+forward error correction (FEC) for enhancing the channel coding gain for a DVB-H receiver, and using a physical (PHY) Reed-Solomon (RS) decoder+FEC to achieve better coding gain. The system and method utilize a dual mode RS decoder (erasure mode and error mode) for FEC decoding. The PHY RS is used to provide smaller granularity for FEC. The system includes a cache memory management scheme for implementing the recursive CRC/RS+FEC in very large scale integrated circuit chip (VLSI) hardware.

Abstract translation: 一种使用递归循环冗余校验（CRC）+前向纠错（FEC）的系统和方法，用于增强DVB-H接收机的信道编码增益，并使用物理（PHY）里德 - 所罗门（RS）解码器+ FEC 实现更好的编码增益。 该系统和方法利用双模式RS解码器（擦除模式和错误模式）进行FEC解码。 PHY RS用于为FEC提供较小的粒度。 该系统包括用于在超大规模集成电路芯片（VLSI）硬件中实现递归CRC / RS + FEC的高速缓冲存储器管理方案。

公开(公告)号：US20050163196A1

公开(公告)日：2005-07-28

申请号：US11089139

申请日：2005-03-24

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

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

IPC: H04B1/707 ,  H04B7/216 ,  H04L25/03 ,  H04L25/49 ,  H04L27/34

CPC classification number: H04B7/216 ,  H04B1/71 ,  H04B1/7107 ,  H04J13/0003 ,  H04J13/16 ,  H04L25/03038 ,  H04L25/03343 ,  H04L25/49 ,  H04L27/3405 ,  H04L2025/03375 ,  H04L2025/03477

Abstract: A communication system performs burst noise cancellation. A transmitter produces and transmits a spread signal that comprises at least one known-value symbol spread by a plurality of non data-carrying orthogonal codes and data symbols spread by at least one data-carrying orthogonal code. The transmitter transmits the spread signal across a communication link that introduces burst noise. A burst noise detector determines burst noise affected chips of the orthogonal codes. A weight computation functional block calculates a plurality of complex-valued combining weights based upon the burst noise affected chips. A vector de-spreader and a linear combiner operate in combination to use the plurality of non data-carrying orthogonal codes, the at least one data-carrying orthogonal code, and the plurality of complex-valued combining weights to de-spread the received spread signal to produce the data symbols with the burst noise substantially removed.

Abstract translation: 通信系统执行突发噪声消除。 发射机产生并发射扩展信号，该扩展信号包括由多个非数据携带正交码扩展的至少一个已知值符号和由至少一个携带数据的正交码扩展的数据符号。 发射机通过引入突发噪声的通信链路发送扩展信号。 突发噪声检测器确定正交码的突发噪声影响码片。 权重计算功能块基于突发噪声影响的码片计算多个复值组合权重。 向量解扩器和线性组合器组合操作以使用多个非数据携带正交码，所述至少一个数据携带正交码和多个复值组合权重来对接收到的扩展进行解扩展 信号以产生具有基本去除的突发噪声的数据符号。

公开(公告)号：USRE44622E1

公开(公告)日：2013-12-03

申请号：US13645489

申请日：2012-10-04

Applicant: Xiaoyu Fu ,  Jun Ma ,  Nabil Yousef

Inventor： Xiaoyu Fu ,  Jun Ma ,  Nabil Yousef

IPC: H04K1/10

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 communication 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样本估计接收符号的粗略偏移的方法 移动广播（CMMB）移动电视通信网络包括将接收到的采样Ykj划分为两组仅噪声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失配时才获得接收的采样 将所述数据的功率和噪声音调的加和除以所述仅噪声音调的功率的和，以获得Lambdakj，并且估计所接收到的所述接收到的噪声音调的整数粗略频率偏移估计值Delta（f（f）} Ij） 当Lambdakj是最大值时的符号。

公开(公告)号：US08599933B2

公开(公告)日：2013-12-03

申请号：US11924628

申请日：2007-10-26

Applicant: Elsayed Ahmed ,  Nabil Yousef

Inventor： Elsayed Ahmed ,  Nabil Yousef

IPC: H04N7/12 ,  H04N11/02 ,  H04N11/04

CPC classification number: H04N7/52 ,  H04N21/434

Abstract: One embodiment provides a method of performing packet identifier (PID) filtering of a digital video broadcasting-handheld (DVB-H) transport stream and includes processing a PID and a continuity counter (CC) sequence of the DVB-H transport stream, computing a number of mismatched bits between the PID and a desired PID, proceeding to a start of a reset state on a first-in-first-out (FIFO) queue of the DVB-H transport stream when a FIFO buffer becomes full, determining if a number of mismatched bits of a first packet in the FIFO buffer is less than a first threshold value, and proceeding to a start of a run algorithm state only if the number of mismatched bits of the first packet in the FIFO buffer is less than the first threshold value and if there is a valid CC sequence that includes the first packet.

Abstract translation: 一个实施例提供了一种执行数字视频广播手持（DVB-H）传输流的分组标识符（PID）滤波的方法，并且包括处理DVB-H传输流的PID和连续性计数器（CC）序列，计算 PID和所需PID之间的不匹配位的数量，当FIFO缓冲器变满时，在DVB-H传输流的先进先出（FIFO）队列中开始复位状态，确定是否 FIFO缓冲器中的第一分组的不匹配比特数小于第一阈值，并且仅当FIFO缓冲器中的第一分组的不匹配比特的数量少于第一阈值的数量时才进入运行算法状态的开始 并且如果存在包括第一分组的有效CC序列。

公开(公告)号：US08077736B2

公开(公告)日：2011-12-13

申请号：US12036389

申请日：2008-02-25

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04L12/42

CPC classification number: H04L65/608 ,  H04J3/0638 ,  H04L65/80

Abstract: An apparatus and method of reducing a channel switching delay in TDM mobile television systems, and comprises receiving a data burst associated with channels for reception on a RF channel bandwidth received on a mobile television receiver, wherein the data burst comprises a plurality of RTP packets and a RTCP packet; buffering the data burst upon reception of a first RTP packet; synchronizing the buffered data burst to allow for reception of playable A/V data; and adjusting the synchronized buffered data burst upon reception of the RTCP packet. The method may further comprise performing the synchronizing upon reception of the RTCP packet. The method may further comprise inserting a null packet in the data burst prior to performing the buffering. The first RTP packet is preferably received prior to reception of the RTCP packet.

Abstract translation: 一种降低TDM移动电视系统中的信道切换延迟的装置和方法，包括：接收与用于在移动电视接收机上接收的RF信道带宽上接收的信道相关联的数据突发，其中所述数据脉冲串包括多个RTP分组， RTCP包; 在接收到第一RTP分组时缓冲数据脉冲串; 同步缓冲的数据脉冲以允许接收可播放的A / V数据; 以及在接收到RTCP分组时调整同步缓冲的数据脉冲串。 该方法还可以包括在接收到RTCP分组时执行同步。 该方法还可以包括在执行缓冲之前在数据突发中插入空分组。 优选地，在接收到RTCP分组之前接收第一RTP分组。

公开(公告)号：US07974364B2

公开(公告)日：2011-07-05

申请号：US12110688

申请日：2008-04-28

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04L27/00

CPC classification number: H04L27/2647 ,  H04B17/309 ,  H04L25/0212 ,  H04L25/0224

Abstract: A technique for Doppler frequency estimation and adaptation in a MediaFLO™ (Forward Link Only) receiver system includes receiving Orthogonal Frequency Division Multiplexing (OFDM) symbols in the receiver, dividing a Doppler frequency range into N ranges corresponding to N interpolation filters; determining a correlation between two OFDM symbols separated by time; estimating a Doppler frequency by the correlation of OFDM symbols; determining a ratio of the correlation of OFDM symbols; comparing the determined ratio of the correlation of OFDM symbols with a look up table of α stored at a receiver to determine a corresponding Doppler frequency; mapping α ranges stored at the look up table to suitable interpolation filters; estimating an interpolation filter from the mapped α ranges mapped against determined α ratio; adapting Time Domain Interpolation (TDI) to the selected interpolation filter; and synchronizing receiver to the TDI filter.

Abstract translation: 在MediaFLO TM（仅前向链路）接收机系统中的多普勒频率估计和适应技术包括在接收机中接收正交频分复用（OFDM）符号，将多普勒频率范围划分为对应于N个插值滤波器的N个范围; 确定由时间分离的两个OFDM符号之间的相关性; 通过OFDM符号的相关来估计多普勒频率; 确定OFDM符号的相关性的比率; 将所确定的OFDM符号的相关比与存储在接收机处的α查找表进行比较，以确定相应的多普勒频率; 将存储在查找表中的α范围映射到合适的内插滤波器; 根据所确定的α比率映射的映射的α范围估计内插滤波器; 适应时域插值（TDI）到选定的插值滤波器; 并将接收器同步到TDI滤波器。

公开(公告)号：US07950042B2

公开(公告)日：2011-05-24

申请号：US11303398

申请日：2005-12-16

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04N7/173

CPC classification number: H04N5/50 ,  H04N5/38 ,  H04N5/4401 ,  H04N21/2365 ,  H04N21/41407 ,  H04N21/4347 ,  H04N21/4384 ,  H04N21/44004 ,  H04N21/4532 ,  H04N21/64315

Abstract: A system and method of reducing a channel switching delay in TDM mobile television systems comprises transmitting a sequence of data bursts associated with channels for reception on a RF channel bandwidth received on a mobile television receiver; switching between an active state of transmission and a non-active state of transmission during reception of channels on the RF channel bandwidth, wherein the active state of transmission comprises transmission of data bursts associated with user-preferred channels and the non-active state of transmission comprises transmission of data bursts associated with user non-preferred channels; anticipating a particular user-preferred channel that a user will likely switch to during reception of channels on the RF channel bandwidth; decoding the sequence of data bursts during the active state of transmission; buffering one decoded data burst for each of the user-preferred channels; and replacing a previously buffered data burst with a newly buffered data burst.

Abstract translation: 降低TDM移动电视系统中的信道切换延迟的系统和方法包括在移动电视接收机上接收的RF信道带宽上发送与用于接收的信道相关联的数据突发序列; 在RF信道带宽上的信道接收期间在传输的活动状态和非活动状态的传输之间进行切换，其中传输的活动状态包括传输与用户优选信道相关联的数据突发和非活动传输状态 包括与用户非优选信道相关联的数据突发的传输; 预期在RF信道带宽上的信道接收期间用户可能切换的特定用户优选信道; 在传输的活动状态期间解码数据突发序列; 缓冲用于每个用户优选信道的一个解码数据突发; 并用新缓冲的数据突发替换先前缓冲的数据突发。