公开(公告)号：US20080130799A1

公开(公告)日：2008-06-05

申请号：US11565003

申请日：2006-11-30

Applicant: Nabil Yousef ,  Aly Ismail ,  Edward Youssoufian

Inventor： Nabil Yousef ,  Aly Ismail ,  Edward Youssoufian

IPC: H04L27/08

CPC classification number: H03G3/3078 ,  H03G3/3068 ,  H04L27/2647

Abstract: A system and method for performing stepped automatic gain control (AGC) for orthogonal-frequency-division-multiplexing (OFDM) applications comprises a radio frequency (RF) tuner and an OFDM demodulator operatively connected to the RF tuner, the OFDM demodulator comprising logic circuitry adapted to (i) detect OFDM symbols from a stream of data; (ii) detect boundaries of the OFDM symbols; (iii) detect a cyclic prefix duration of data values associated with the OFDM symbols; and (iv) provide a feedback to the RF tuner of the information pertaining to the boundaries of the OFDM symbols and the cyclic prefix duration.

Abstract translation: 用于对正交频分复用（OFDM）应用执行步进式自动增益控制（AGC）的系统和方法包括射频（RF）调谐器和可操作地连接到RF调谐器的OFDM解调器，OFDM解调器包括逻辑电路 适于（i）从数据流检测OFDM符号; （ii）检测OFDM符号的边界; （iii）检测与所述OFDM符号相关联的数据值的循环前缀持续时间; 以及（iv）向RF调谐器提供与OFDM符号的边界有关的信息和循环前缀持续时间的反馈。

公开(公告)号：US20070143810A1

公开(公告)日：2007-06-21

申请号：US11303398

申请日：2005-12-16

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04N5/50 ,  H04N7/173 ,  H04N7/16

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: 减少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。

公开(公告)号：US20050053129A1

公开(公告)日：2005-03-10

申请号：US10951318

申请日：2004-09-27

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H03K5/159

CPC classification number: H03H21/0012 ,  H04L25/03057 ,  H04L25/03987 ,  H04L2025/03566 ,  H04L2025/03636 ,  H04L2025/03687

Abstract: An adaptive filter has a plurality of filter coefficients and a filter coefficients processing unit trains of the adaptive filter. The filter coefficients processing unit is operable to iterate to alter the plurality of filter coefficients of the communication system filter. Every Nth iteration, the filter coefficients processing unit is operable to identify a first group of filter coefficients of the plurality of filter coefficients that satisfy filter coefficient threshold rules and a second group of filter coefficients of the plurality of filter coefficients that do not satisfy the filter coefficient threshold rules. Every iteration, the filter coefficients processing unit is operable to: (1) update the first group of filter coefficients using a first step size and a first error signal; and (2) update the second group of filter coefficients using a second step size and a second error signal.

Abstract translation: 自适应滤波器具有多个滤波器系数和自适应滤波器的滤波器系数处理单元列。 滤波器系数处理单元可操作以迭代以改变通信系统滤波器的多个滤波器系数。 每第N次迭代，滤波器系数处理单元可操作以识别满足滤波器系数阈值规则的多个滤波器系数的第一组滤波器系数和不满足滤波器的多个滤波器系数的第二组滤波器系数 系数阈值规则。 每次迭代，滤波器系数处理单元可操作以：（1）使用第一步长和第一误差信号来更新第一组滤波器系数; 和（2）使用第二步长和第二误差信号来更新第二组滤波器系数。

公开(公告)号：US08165230B2

公开(公告)日：2012-04-24

申请号：US12110602

申请日：2008-04-28

Applicant: Ahmed Ragab ,  Nabil Yousef

Inventor： Ahmed Ragab ,  Nabil Yousef

IPC: H04K1/10 ,  H04L27/28

CPC classification number: H04L25/0224 ,  H04L27/2647

Abstract: An apparatus and method for estimating Doppler frequency in a wireless communication network, wherein the method comprises determining a first correlation coefficient (c1) between a currently received Orthogonal Frequency Division Multiplexed (OFDM) symbol and an OFDM symbol received previous to the currently received OFDM symbol, and a second correlation coefficient (c2) between the currently received OFDM symbol and an OFDM symbol received immediately previous to the OFDM symbol received previous to the currently received OFDM symbol; performing a leaky integration across OFDM symbols of the resulting first and second correlation coefficients (c1, c2) to obtain an estimate of the first and second correlation coefficients; dividing the second correlation coefficient (c2) by the first correlation coefficient (c1) to obtain a correlation coefficient ratio; and using the correlation coefficient ratio as an estimate of the Doppler frequency in the wireless communication system.

Abstract translation: 一种用于估计无线通信网络中的多普勒频率的装置和方法，其中所述方法包括确定当前接收的正交频分复用（OFDM）符号与在当前接收的OFDM符号之前接收的OFDM符号之间的第一相关系数（c1） 以及当前接收的OFDM符号与在紧接在当前接收的OFDM符号之前接收的OFDM符号之前接收的OFDM符号之间的第二相关系数（c2） 在所得到的第一和第二相关系数（c1，c2）的OFDM符号之间执行泄漏积分以获得第一和第二相关系数的估计; 将第二相关系数（c2）除以第一相关系数（c1）以获得相关系数比; 以及使用相关系数比作为无线通信系统中的多普勒频率的估计。

公开(公告)号：US07907637B2

公开(公告)日：2011-03-15

申请号：US12062734

申请日：2008-04-04

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04B3/10

CPC classification number: H04L7/06 ,  H04N21/41407 ,  H04N21/6405

Abstract: A technique of acquisition in a MediaFLO™ (Forward Link Only) mobile multimedia multicast system, wherein the method comprises receiving a superframe comprising a first digital symbol in a receiver operating in a first state of operation; assuming the first received digital symbol to be a Time Division Multiplexed (TDM) pilot symbol; calculating a first sparseness index of the first symbol; storing the first sparseness index; operating the receiver in a second state of operation; receiving a second digital symbol; calculating a second sparseness index for the second digital symbol; the receiver remaining in the second state of operation when the second sparseness index is greater than the first sparseness index, wherein the second digital symbol is assumed to be the TDM pilot symbol; and verifying that the last assumed TDM pilot symbol is the correct TDM pilot of the superframe.

Abstract translation: 一种在MediaFLO TM（仅前向链路）移动多媒体多播系统中获取的技术，其中所述方法包括：接收在第一操作状态下操作的接收机中包含第一数字符号的超帧; 假设第一接收数字符号为时分多路复用（TDM）导频符号; 计算第一符号的第一稀疏度指数; 存储第一稀疏指数; 在第二操作状态下操作接收器; 接收第二数字符号; 计算第二数字符号的第二稀疏度指数; 当所述第二稀疏度指数大于所述第一稀疏度指标时，所述接收器保持在所述第二操作状态，其中，所述第二数字符号被假设为所述TDM导频符号; 并验证最后假设的TDM导频符号是超帧的正确TDM导频。

公开(公告)号：US20110002242A9

公开(公告)日：2011-01-06

申请号：US10386795

申请日：2003-03-12

Applicant: Randall Perlow ,  Nabil Yousef ,  Charles Brooks ,  Tianmin Liu

Inventor： Randall Perlow ,  Nabil Yousef ,  Charles Brooks ,  Tianmin Liu

IPC: H04B7/005

CPC classification number: H04L25/0218 ,  H04L25/03057 ,  H04L25/03987 ,  H04L2025/0349 ,  H04L2025/03617 ,  H04L2025/0377

Abstract: Sparse channel equalization may be achieved by receiving a signal via a multi-path communication channel. The equalization then continues by extracting sparse information regarding the multiple path communication channel from the signal. Such sparse information generally indicates the position of the signals received via each of the multiple paths. The equalization then continues by estimating a channel response of the multiple path communication channel based on the sparse information. The equalization then continues by generating equalization taps (or coefficients) based on the channel response. The equalization then continues by equalizing the signal based on the equalization taps.

Abstract translation: 可以通过经由多径通信信道接收信号来实现稀疏信道均衡。 然后通过从信号中提取关于多路径通信信道的稀疏信息来继续均衡。 这种稀疏信息通常表示通过多路径中的每一条接收到的信号的位置。 然后通过基于稀疏信息估计多路径通信信道的信道响应来继续均衡。 然后通过基于信道响应产生均衡抽头（或系数）来继续均衡。 然后通过基于均衡抽头均衡信号来继续均衡。

公开(公告)号：US07855959B2

公开(公告)日：2010-12-21

申请号：US12110658

申请日：2008-04-28

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: G01R31/08 ,  H04L1/00

CPC classification number: H04N21/6112 ,  H04N21/2362 ,  H04N21/41407 ,  H04N21/4381 ,  H04N21/44004 ,  H04N21/4828

Abstract: A technique for fast common overhead services acquisition for MediaFLO™ mobile multimedia multicast system, wherein encoding overhead information symbol (OIS) information in a first burst of MLC of each superframe, OIS comprises control channel (CC) information and reserved flow data comprising primary flow data, service information data, notification flow data, configuration flow data, and presentation metadata; encoding padding in second MLC burst; encoding parity bytes in third and fourth MLC bursts; encoding primary flow data in final MLC burst per superframe; encoding the remaining reserved flow data at the end of superframe; transmitting wireless data stream comprising first MLC at ½ forward error correction (FEC) rate and receiving it in receiver; determining a correctness of CC information by checking cyclic redundancy check (CRC) bits at the end of each received data packet; and transmitter sending size wise remainder of reserved flows at the end of superframe.

Abstract translation: 一种用于MediaFLO TM移动多媒体多播系统的快速常规开销服务采集的技术，其中在每个超帧的MLC的第一突发中编码开销信息符号（OIS）信息，OIS包括控制信道（CC）信息和包括主流的保留流数据 数据，服务信息数据，通知流数据，配置流数据和呈现元数据; 在第二MLC突发中编码填充; 在第三和第四MLC突发中编码奇偶校验字节; 在每个超帧的最终MLC突发中编码主流数据; 在超帧结束时编码剩余的保留流数据; 以前向纠错（FEC）速率传输包括第一MLC的无线数据流并在接收机中接收它; 通过检查每个接收到的数据分组的结尾处的循环冗余校验（CRC）比特来确定CC信息的正确性; 并且发送器在超帧结束时发送大量明智的剩余保留流。

公开(公告)号：US07751309B2

公开(公告)日：2010-07-06

申请号：US12062758

申请日：2008-04-04

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04J11/00

CPC classification number: H04L27/261 ,  H04L25/022 ,  H04L25/0224 ,  H04L27/2647

Abstract: An apparatus and method for WIC/LIC estimation without channel mode construction in a MediaFLO™ system comprising a receiver, a transmitter and transmission channel, wherein the method comprises receiving a signal comprising a MediaFLO™ mobile multimedia multicast system superframe comprising WIC/LIC symbols; setting a first sparseness index value of the digital signal to zero; setting a local copy WIC/LIC number of the digital signal to one; generating a local copy of all possible values of the WIC/LIC symbols corresponding to a WID/LID value from zero to fifteen; dividing the received WIC/LIC symbol values by a local copy WIC/LIC value corresponding to WIC/LIC number one; performing an IFFT of all the possible values of the WIC and LIC symbols; calculating a second sparseness index value of the IFFT of sixteen possible values of the WIC/LIC symbols; and extracting a WIC/LIC symbol from the digital signal corresponding to the second sparseness index.

Abstract translation: 一种用于在包括接收机，发射机和传输信道的MediaFLO TM系统中不使用信道模式构造的WIC / LIC估计的装置和方法，其中所述方法包括接收包括包括WIC / LIC符号的MediaFLO TM移动多媒体多播系统超帧的信号; 将数字信号的第一稀疏度索引值设置为零; 将本地副本WIC / LIC数字信号设置为1; 生成对应于WID / LID值的WIC / LIC符号的所有可能值的本地副本从零到十五; 将所接收的WIC / LIC符号值除以对应于WIC / LIC第一的本地拷贝WIC / LIC值; 执行WIC和LIC符号的所有可能值的IFFT; 计算WIC / LIC符号的十六个可能值的IFFT的第二稀疏度指数值; 以及从对应于第二稀疏度指数的数字信号中提取WIC / LIC符号。

公开(公告)号：US07710857B2

公开(公告)日：2010-05-04

申请号：US11766811

申请日：2007-06-22

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04L27/28

CPC classification number: H04L27/2647 ,  H04L27/2075 ,  H04L27/2331

Abstract: A method and system for coherent detection in which an OFDM symbol is multiplied by the complex conjugate of the previous OFDM symbol, which is obtained by one OFDM symbol delay and a complex conjugation circuit. This soft decision is passed through a QPSK slicer to obtain a hard decision. The soft decision is then divided by the hard decisions. The channel phase change between the two OFDM symbols is then obtained. For the first OFDM symbol, the channel is computed. A channel estimate for each ODFM symbol is computed from corresponding channel estimates and channel phase difference estimates. The channel phase difference between each two OFDM symbols is computed. The channel phase difference is passed through an exponent operation and multiplied by the soft decision to obtain a refined soft decision that is then passed through another QPSK slicer to obtain the final hard decision.

Abstract translation: 一种用于相干检测的方法和系统，其中OFDM符号乘以由一个OFDM符号延迟获得的先前OFDM符号的复共轭和复共轭电路。 该软判决通过QPSK限幅器获得硬判决。 然后，软判决被硬决定划分。 然后获得两个OFDM符号之间的信道相位变化。 对于第一个OFDM符号，计算通道。 从相应的信道估计和信道相位差估计计算每个ODFM符号的信道估计。 计算每个OFDM符号之间的信道相位差。 信道相位差通过指数运算并乘以软判决，以获得精细的软判决，然后通过另一QPSK限幅器传递以获得最终的硬判决。

公开(公告)号：US07697644B2

公开(公告)日：2010-04-13

申请号：US11565003

申请日：2006-11-30

Applicant: Nabil Yousef ,  Aly Ismail ,  Edward Youssoufian

Inventor： Nabil Yousef ,  Aly Ismail ,  Edward Youssoufian

IPC: H04L27/08

CPC classification number: H03G3/3078 ,  H03G3/3068 ,  H04L27/2647

Abstract: A system and method for performing stepped automatic gain control (AGC) for orthogonal-frequency-division-multiplexing (OFDM) applications comprises a radio frequency (RF) tuner and an OFDM demodulator operatively connected to the RF tuner, the OFDM demodulator comprising logic circuitry adapted to (i) detect OFDM symbols from a stream of data; (ii) detect boundaries of the OFDM symbols; (iii) detect a cyclic prefix duration of data values associated with the OFDM symbols; and (iv) provide a feedback to the RF tuner of the information pertaining to the boundaries of the OFDM symbols and the cyclic prefix duration.

Abstract translation: 用于对正交频分复用（OFDM）应用执行步进式自动增益控制（AGC）的系统和方法包括射频（RF）调谐器和可操作地连接到RF调谐器的OFDM解调器，OFDM解调器包括逻辑电路 适于（i）从数据流检测OFDM符号; （ii）检测OFDM符号的边界; （iii）检测与所述OFDM符号相关联的数据值的循环前缀持续时间; 以及（iv）向RF调谐器提供与OFDM符号的边界有关的信息和循环前缀持续时间的反馈。