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。

公开(公告)号：US20090252256A1

公开(公告)日：2009-10-08

申请号：US12062734

申请日：2008-04-04

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04L27/00

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：US07599441B2

公开(公告)日：2009-10-06

申请号：US11471187

申请日：2006-06-20

Applicant: Jun Ma ,  Nabil Yousef

Inventor： Jun Ma ,  Nabil Yousef

IPC: H04L5/12 ,  H04L23/02 ,  H04L27/06

CPC classification number: H04L25/067 ,  H04L1/0041 ,  H04L1/0052 ,  H04L1/0054 ,  H04L1/006 ,  H04L1/0071 ,  H04L27/34 ,  H04L27/38

Abstract: A DVB-H bit-interleave coded modulation/demodulation system and method includes a convolutional encoder; an interleaver operatively connected to the convolutional encoder; a quadrature amplitude modulation (QAM) mapper operatively connected to the interleaver; a channel component operatively connected to the QAM mapper; a QAM demapper operatively connected to the channel component; a de-interleaver operatively connected to the QAM demapper; and a Viterbi decoder operatively connected to the de-interleaver. Preferably, the interleaver comprises a bit-wise interleaver and a symbol-wise interleaver operatively connected to the bit-wise interleaver. Preferably, the de-interleaver comprises a bit-wise de-interleaver; and a symbol-wise de-interleaver operatively connected to the bit-wise de-interleaver. The de-interleaver may be adapted to decode a soft decision metric for any of a QPSK, 16QAM, and 64QAM modulation. The de-interleaver may be adapted to decode a soft decision metric computation comprising a log-likelihood ratio soft decision metric of a binary bit stream of a signal.

Abstract translation: DVB-H位交织编码调制/解调系统和方法包括卷积编码器; 可操作地连接到卷积编码器的交织器; 可操作地连接到交织器的正交幅度调制（QAM）映射器; 可操作地连接到QAM映射器的信道分量; 可操作地连接到信道分量的QAM解映射器; 可操作地连接到QAM解映射器的解交织器; 以及可操作地连接到解交织器的维特比解码器。 优选地，交织器包括可操作地连接到逐位交织器的逐位交织器和符号方式的交织器。 优选地，解交织器包括位逐去交织器; 以及可操作地连接到逐位解交织器的符号式解交织器。 解交织器可以适于解码用于QPSK，16QAM和64QAM调制中的任何一个的软判决度量。 解交织器可以适于解码包括信号的二进制比特流的对数似然比软判决度量的软判决度量计算。

公开(公告)号：US20090213831A1

公开(公告)日：2009-08-27

申请号：US12036389

申请日：2008-02-25

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04J3/00

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：US20090129344A1

公开(公告)日：2009-05-21

申请号：US11943661

申请日：2007-11-21

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04J3/00

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：US20090110118A1

公开(公告)日：2009-04-30

申请号：US11923682

申请日：2007-10-25

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04L27/06

CPC classification number: H04L25/067 ,  H04L1/0054 ,  H04L1/0071 ,  H04L25/03248 ,  H04L25/03286 ,  H04L25/03318 ,  H04L2025/0342

Abstract: A receiver for use in a wireless network comprising a communications channel and a method of allocating deinterleaver memory usage in the receiver, wherein the receiver comprises a processor adapted to organize subchannels of the communications channel and set a number (N) of data bits per soft decision, wherein the soft decision is represented by N data bits; an address decoder adapted to decode the subchannels; a demapper adapted to receive QAM symbols and demap the QAM symbols to soft decisions; a deinterleaver adapted to perform deinterleaving on the soft decisions, wherein the deinterleaver comprises a memory component having a storage size that is a function of the number (N) of bits per soft decision; and a Viterbi decoder adapted to decode the deinterleaved soft decisions.

Abstract translation: 一种在包括通信信道的无线网络中使用的接收机以及在所述接收机中分配解交织器存储器使用的方法，其中所述接收机包括处理器，其适于组织所述通信信道的子信道并且设置每个软件的数目（N）个数据位 决定，其中所述软判决由N个数据位表示; 地址解码器，其适于解码所述子信道; 解映射器，适于接收QAM符号并将QAM符号解映射为软判决; 解交织器，其适于对所述软判决执行去交织，其中所述解交织器包括存储器组件，所述存储器组件具有作为每个软判决的位数（N）的函数的存储大小; 以及适于对解交织的软判决进行解码的维特比解码器。

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：US20080022335A1

公开(公告)日：2008-01-24

申请号：US11459366

申请日：2006-07-24

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04N7/173 ,  H04N7/16

CPC classification number: H04N21/4821 ,  H04N21/41407 ,  H04N21/4263 ,  H04N21/4331 ,  H04N21/4383

Abstract: A method of creating a visual program guide for use on a TDM mobile TV receiver comprises receiving a RF signal associated with a TV channel; demodulating all of the received RF signals associated with the TV channels; decoding all of the demodulated received RF signals corresponding to all the TV channels simultaneously; and creating the visual program guide as a consolidated view of each of the decoded TV channels, wherein the simultaneous decoding of the demodulated received RF signals significantly reduces a power consumption level and a memory utilization level in the receiver.

Abstract translation: 一种创建在TDM移动TV接收机上使用的可视节目指南的方法包括：接收与TV频道相关联的RF信号; 解调与TV信道相关联的所有接收到的RF信号; 解码所有与所有电视频道对应的接收的RF信号的所有解码; 以及创建视觉节目指南作为每个解码的TV频道的综合视图，其中所解调的接收的RF信号的同时解码显着地降低了接收机中的功耗水平和存储器利用水平。

公开(公告)号：US20070268871A1

公开(公告)日：2007-11-22

申请号：US11833155

申请日：2007-08-02

Applicant: Jonathan Min ,  Nabil Yousef

Inventor： Jonathan Min ,  Nabil Yousef

IPC: H04L12/56

CPC classification number: H04N21/20 ,  H04L27/38 ,  H04L2027/0046 ,  H04L2027/0065 ,  H04L2027/0095 ,  H04N7/17336 ,  H04N21/4622 ,  H04N21/4782

Abstract: Carrier frequency offset (CFO) estimation from preamble symbols. Any communication receiver may be adapted to perform the CFO estimation. The CFO estimation is performed using a low complexity, high accuracy CFO estimation method. The operation may be described as follows: each element of a received sequence is divided by the corresponding preamble element, the resulting sequence is divided into N subgroups, and each subgroup is then averaged. The phase differential of the resulting sequence is computed, averaged, and used to compute an estimate of the carrier frequency offset. This approach to performing CFO estimation is of relatively high estimation accuracy and of relatively low computational complexity.

Abstract translation: 来自前导符号的载波频率偏移（CFO）估计。 任何通信接收机可以适于执行CFO估计。 使用低复杂度，高精度的CFO估计方法来执行CFO估计。 该操作可以描述如下：接收到的序列的每个元素被相应的前导码元素划分，所得到的序列被划分成N个子组，然后对每个子组进行平均。 计算得到的序列的相位差，进行平均，并用于计算载波频率偏移的估计。 执行CFO估计的这种方法具有相对高的估计精度和相对低的计算复杂度。