公开(公告)号：US07944983B2

公开(公告)日：2011-05-17

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

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Λkj，并且估计所接收到的噪声的整数粗频率偏移估计，并且（D（f）} Ij） ∧kj为最大值时的符号。

公开(公告)号：US07907683B2

公开(公告)日：2011-03-15

申请号：US12110622

申请日：2008-04-28

Applicant: Ricardo Merched ,  Nabil Yousef

Inventor： Ricardo Merched ,  Nabil Yousef

IPC: H04L27/00

CPC classification number: H04L25/0244 ,  H04L5/0053 ,  H04L25/021 ,  H04L25/022 ,  H04L25/0236 ,  H04L25/0246 ,  H04L25/0248 ,  H04L25/025 ,  H04L25/0256 ,  H04L25/03171 ,  H04L27/2647

Abstract: An apparatus and method of applying a superfast algorithm to a pilot-based channel estimation process includes receiving a signal comprising information bits transmitted in a wireless channel, executing the pilot-based channel estimation process having p structures for a vector of pilot structures and an upper bound N for a channel spread, determining a result of a matrix inversion of a channel correlation matrix for an error channel estimation offline without performing a matrix inversion, storing pilot information of the received signal for channel recovery in a transform domain, representing the Toeplitz inverse by a FFT representation, detecting and estimating nonzero taps of a channel impulse response of the wireless channel, obtaining a non-structured minimum mean-square-error (MMSE) estimate as a first estimate of locations of the nonzero taps, and replacing the non-structured MMSE estimate by an estimate computed by a tap detection algorithm.

Abstract translation: 一种将超快速算法应用于基于导频的信道估计过程的装置和方法包括：接收包括在无线信道中发送的信息比特的信号，执行具有用于导频结构向量的p个结构的基于导频的信道估计过程， 绑定N用于信道扩展，确定用于误差信道估计的信道相关矩阵的矩阵求逆的结果，而不执行矩阵求逆，在变换域中存储用于信道恢复的接收信号的导频信息，表示Toeplitz反相 通过FFT表示，检测和估计无线信道的信道脉冲响应的非零抽头，获得非结构化最小均方误差（MMSE）估计作为非零抽头的位置的第一估计， 通过抽头检测算法计算的估计结构化MMSE估计。

公开(公告)号：US07855996B2

公开(公告)日：2010-12-21

申请号：US11943661

申请日：2007-11-21

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04W4/00

CPC classification number: H04H20/33 ,  H04H20/26

Abstract: Enhancing stream layer transmission for a MediaFLO mobile multimedia multicast system comprising a transmitter and a receiver includes sending a plurality of multicast logical channels (MLC) forming a data frame from the transmitter, wherein each MLC comprises multimedia data streams comprising a stream 0, 1, and 2 data packet, and parity data bits; switching, by the transmitter, an order of the multimedia data streams of the MLC transmitted by the transmitter; sending a signal to the receiver from the transmitter to specify a mode of transmission of the MLC, wherein the mode of transmission comprises an order of transmitting the data packets of the MLC; inserting, by the transmitter, a flag in control information transmitted in the stream 0 data packets; decoding, by the receiver, the flag to determine the mode of transmission; and performing, by the receiver, a CRC of the stream 0 data packet.

Abstract translation: 包括发射机和接收机的MediaFLO移动多媒体多播系统的增强流层传输包括从发射机发送形成数据帧的多个多播逻辑信道（MLC），其中每个MLC包括多媒体数据流，包括流0,1， 和2个数据包和奇偶校验数据位; 由发射机切换由发射机发射的MLC的多媒体数据流的顺序; 从所述发射机向所述接收机发送信号以指定所述MLC的传输模式，其中所述传输模式包括发送所述MLC的数据分组的顺序; 由发射机插入在流0数据分组中发送的控制信息中的标志; 通过接收机解码标志来确定传输方式; 并且由接收机执行流0数据分组的CRC。

公开(公告)号：US07782903B2

公开(公告)日：2010-08-24

申请号：US12120487

申请日：2008-05-14

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04J3/16 ,  H04J3/22

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，包括包括主机处理器和主机存储器组件的发射机。 所述处理包括接收器，其接收无线数据流，所述无线数据流包括MediaFLO TM移动多媒体多播系统超帧，所述超帧包括布置在多路复用多播逻辑信道（MLC）中并从所述发射机接收的音频，视频和文本媒体帧中的任何一个，其中每个MLC是 分为16字节的数据包，并且其中每个MLC携带最多三个包含流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介质访问控制（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：US20090323790A1

公开(公告)日：2009-12-31

申请号：US12110688

申请日：2008-04-28

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04B17/00 ,  H04L27/28

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: 用于MediaFLO TM（仅前向链路）接收机系统中的多普勒频率估计和自适应的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个内插滤波器的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符号的相关比与在接收机处存储的α的查找表进行比较，以确定相应的多普勒频率; 将查找表上存储的α范围映射到合适的插值滤波器; 从与所确定的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：US20090323789A1

公开(公告)日：2009-12-31

申请号：US12110602

申请日：2008-04-28

Applicant: Ahmed Ragab ,  Nabil Yousef

Inventor： Ahmed Ragab ,  Nabil Yousef

IPC: H04B17/00 ,  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：US20090290663A1

公开(公告)日：2009-11-26

申请号：US12124389

申请日：2008-05-21

Applicant: Elsayed Ahmed Elsayed ,  Nabil Yousef

Inventor： Elsayed Ahmed Elsayed ,  Nabil Yousef

IPC: H04L27/06

CPC classification number: H04L27/2675 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/2659

Abstract: A method of estimating a coarse frequency offset of Digital Multimedia Broadcasting (DMB) transmission frames includes receiving the DMB transmission frames including a synchronization channel having a phase reference symbol, circularly shifting the phase reference symbol by applying a circular shift to the phase reference symbol, numerically correlating the circularly shifted phase reference symbol with a known correct phase reference symbol to obtain a highest peak and a side peaks of the numeric correlation, and computing a phase reference symbol angle based on a multiplication of the peak and a carrier spacing of the DMB transmission frames. The peak is determined when the circularly shifted phase reference symbol is equal to the known correct phase reference symbol. The peak and side peaks corresponding to the peak are operated in a range of a maximum value of the circular shift.

Abstract translation: 估计数字多媒体广播（DMB）传输帧的粗频偏移的方法包括：接收包括具有相位参考符号的同步信道的DMB传输帧，通过对相位参考符号进行循环移位来循环移位相位参考符号， 将循环相移参考符号与已知的正确相位参考符号数值相关以获得数值相关的最高峰值和侧峰值，并且基于DMB的峰值和载波间隔的乘法来计算相位参考符号角度 传输帧。 当循环相位参考符号等于已知的正确相位参考符号时，确定峰值。 对应于峰值的峰值和侧峰值在循环移位的最大值的范围内操作。

公开(公告)号：US20090290496A1

公开(公告)日：2009-11-26

申请号：US12124387

申请日：2008-05-21

Applicant: Samer Sarhan ,  Nabil Yousef

Inventor： Samer Sarhan ,  Nabil Yousef

IPC: G01R31/08

CPC classification number: H04L1/0079 ,  H04L5/0048

Abstract: A technique for finding errors in the fragment headers of the fragments of service layer packets without depending on the erasure indicators of Medium Access Channel (MAC) layer packets of a wireless signal in a wireless communication system, wherein method comprises determining if length of the fragment header is between 121 and 127; determining if length of the fragment header is equal to 127, and if the fragment header is not the last fragment header in a service layer packet being formed; determining if summation of length of the fragment header for a value N is greater than 122 subtracted by number of fragments collected from a MAC layer packet including fragment header; and determining if fragment header is not the last fragment header in the service layer packet being formed, and if fragment header length is less than residual number of bytes in the MAC layer packet.

Abstract translation: 一种用于在不依赖于无线通信系统中的无线信号的介质访问信道（MAC）层分组的擦除指示符的情况下在服务层分组的分段报头中发现错误的技术，其中方法包括确定该分段的长度 标题在121到127之间; 确定片段头的长度是否等于127，并且如果片段头不是正在形成的服务层包中的最后片段头; 根据从包含片段头的MAC层包收集的片段数，确定值N的片段头的长度的和是否大于122; 以及确定片段头不是正在形成的服务层分组中的最后片段头，并且如果片段头长度小于MAC层分组中的剩余字节数。

公开(公告)号：US20090252239A1

公开(公告)日：2009-10-08

申请号：US12062774

申请日：2008-04-04

Applicant: Jun Ma ,  Nabil Yousef

Inventor： Jun Ma ,  Nabil Yousef

IPC: H04L27/28 ,  H04L27/06

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) system, wherein the method comprises 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）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：US20090252238A1

公开(公告)日：2009-10-08

申请号：US12062712

申请日：2008-04-04

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04L27/28 ,  G06F7/00 ,  G06F17/30

CPC classification number: H04L27/2662 ,  H04L27/2675 ,  H04L27/2695

Abstract: A technique for re-acquiring a symbol index in the presence of sleep timer errors in a MediaFLO™ (Forward Link Only) mobile multimedia multicast system comprising a receiver and a transmitter, wherein the method comprises receiving a digital signal comprising a superframe comprising one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols in the receiver comprising a timer; waking up the receiver from a sleep mode of operation by an amount of time equal to a maximum error introduced by the timer plus a time to reacquire a beginning of each OFDM symbol plus a time to reacquire a symbol index; and reacquiring the symbol index.

Abstract translation: 一种用于在包括接收机和发射机的MediaFLO TM（仅前向链路）移动多媒体多播系统中存在睡眠定时器错误的情况下重新获取符号索引的技术，其中所述方法包括接收包括超帧的数字信号，所述超帧包括 接收机中的一个或多个正交频分复用（OFDM）符号，包括定时器; 将接收机从休眠模式唤醒等于定时器引入的最大误差的时间加上重新获取每个OFDM符号的开始的时间加上重新获取符号索引的时间; 并重新获取符号索引。