公开(公告)号：US20080317022A1

公开(公告)日：2008-12-25

申请号：US11766816

申请日：2007-06-22

Applicant: Elsayed Ahmed ,  Nabil Yousef

Inventor： Elsayed Ahmed ,  Nabil Yousef

IPC: H04L12/56

CPC classification number: H04L7/048 ,  H04H40/18 ,  H04H60/11 ,  H04L1/0045 ,  H04L1/0079 ,  H04L69/22

Abstract: FEC frame synchronization in a DAB-IP system comprising FEC frames includes receiving FEC packets each comprising a FEC packet header and a FEC data field comprising padding bytes at an end of a last FEC packet received; comparing a received FEC packet header with a known FEC packet header until a number of bit errors in the received FEC packet header is less than or equal to a predetermined amount; and matching the received FEC packet header and the padding bytes until at least one of the following actions occur thereby resulting in receiver locking: a number of successive FEC packet headers mismatches in the received FEC packet header; a predetermined number of FEC packets end without padding matching; and FEC packet header and padding matching occurs. The received FEC packets are tracked after receiver locking has occurred to ensure FEC parity packets are positioned properly in the FEC frames.

Abstract translation: 包括FEC帧的DAB-IP系统中的FEC帧同步包括接收每个包括FEC分组报头的FEC分组和包括在接收的最后FEC分组的末尾的填充字节的FEC数据字段; 将接收到的FEC分组报头与已知FEC分组报头进行比较，直到接收的​​FEC分组报头中的位错误数量小于或等于预定量; 并且匹配接收到的FEC分组报头和填充字节，直到发生以下动作中的至少一个，从而导致接收器锁定：接收的FEC分组报头中的多个连续的FEC分组报头不匹配; 预定数量的FEC分组结束而不进行填充匹配; 并且发生FEC分组报头和填充匹配。 在发生接收机锁定之后跟踪接收的FEC分组，以确保FEC奇偶校验分组在FEC帧中正确定位。

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：US07940759B2

公开(公告)日：2011-05-10

申请号：US11766816

申请日：2007-06-22

Applicant: Elsayed Ahmed ,  Nabil Yousef

Inventor： Elsayed Ahmed ,  Nabil Yousef

IPC: H04L12/56

CPC classification number: H04L7/048 ,  H04H40/18 ,  H04H60/11 ,  H04L1/0045 ,  H04L1/0079 ,  H04L69/22

Abstract: FEC frame synchronization in a DAB-IP system comprising FEC frames includes receiving FEC packets each comprising a FEC packet header and a FEC data field comprising padding bytes at an end of a last FEC packet received; comparing a received FEC packet header with a known FEC packet header until a number of bit errors in the received FEC packet header is less than or equal to a predetermined amount; and matching the received FEC packet header and the padding bytes until at least one of the following actions occur thereby resulting in receiver locking: a number of successive FEC packet headers mismatches in the received FEC packet header; a predetermined number of FEC packets end without padding matching; and FEC packet header and padding matching occurs. The received FEC packets are tracked after receiver locking has occurred to ensure FEC parity packets are positioned properly in the FEC frames.

Abstract translation: 包括FEC帧的DAB-IP系统中的FEC帧同步包括接收每个包括FEC分组报头的FEC分组和包括在接收的最后FEC分组的末尾的填充字节的FEC数据字段; 将接收到的FEC分组报头与已知FEC分组报头进行比较，直到接收的​​FEC分组报头中的位错误数量小于或等于预定量; 并且匹配接收到的FEC分组报头和填充字节，直到发生以下动作中的至少一个，从而导致接收器锁定：接收的FEC分组报头中的多个连续的FEC分组报头不匹配; 预定数量的FEC分组结束而不进行填充匹配; 并且发生FEC分组报头和填充匹配。 在发生接收机锁定之后跟踪接收的FEC分组，以确保FEC奇偶校验分组在FEC帧中正确定位。

公开(公告)号：US08005173B2

公开(公告)日：2011-08-23

申请号：US12124389

申请日：2008-05-21

Applicant: Elsayed Ahmed Elsayed ,  Nabil Yousef

Inventor： Elsayed Ahmed Elsayed ,  Nabil Yousef

IPC: H03D1/00 ,  H04L7/00

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：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：US20090110082A1

公开(公告)日：2009-04-30

申请号：US11924628

申请日：2007-10-26

Applicant: Elsayed Ahmed ,  Nabil Yousef

Inventor： Elsayed Ahmed ,  Nabil Yousef

IPC: H04N7/24

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）队列中进入复位状态的开始，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。