公开(公告)号：US20090059885A1

公开(公告)日：2009-03-05

申请号：US11850180

申请日：2007-09-05

Applicant: Mirette Sadek ,  Nabil Yousef

Inventor： Mirette Sadek ,  Nabil Yousef

IPC: H04J1/00

CPC classification number: H04L5/0007 ,  H04L5/0048 ,  H04L25/0204 ,  H04L25/0216 ,  H04L25/0226 ,  H04L25/0232

Abstract: A receiver for use in a pilot-aided OFDM system and a method of performing channel length estimation of a channel in a wireless communication system includes using transmitted and received wireless signals to estimate a channel carrier function vector at continuous and scattered pilot positions of consecutive OFDM symbols; performing time-domain interpolation by (i) upsampling the estimated the channel carrier function vectors at the scattered pilot positions by inserting zeros in between estimated scattered pilot positions, and (ii) filtering the upsampled vectors using a finite impulse response filter comprising a filter bank comprising a plurality of filters; mapping the channel carrier function vector to only one of the filters in the filter bank located in the finite impulse response filter, wherein the mapping causes noise reduction and enhanced channel estimation thereby increasing a maximum Doppler frequency in the channel.

Abstract translation: 在导频辅助OFDM系统中使用的接收机和在无线通信系统中执行信道长度估计的方法包括使用发送和接收的无线信号来估计连续OFDM连续和分散导频位置的信道载波函数向量 符号; （i）通过在估计的分散导频位置之间插入零来对估计出的散射导频位置处的信道载波函数向量进行上采样，以及（ii）使用包括滤波器组的有限脉冲响应滤波器对上采样向量进行滤波来执行时域内插 包括多个过滤器; 将信道载波函数向量映射到位于有限脉冲响应滤波器中的滤波器组中仅一个滤波器，其中映射引起噪声降低和增强的信道估计，从​​而增加信道中的最大多普勒频率。

公开(公告)号：US20080316909A1

公开(公告)日：2008-12-25

申请号：US11766811

申请日：2007-06-22

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04J11/00

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

Abstract: A method and system for coherent detection in which a 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 OFM 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。 计算每两个OFM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：US20070293256A1

公开(公告)日：2007-12-20

申请号：US11471253

申请日：2006-06-20

Applicant: Ricardo Merched ,  Nabil Yousef

Inventor： Ricardo Merched ,  Nabil Yousef

IPC: H04B1/00 ,  H04B17/00

CPC classification number: H04L27/3854 ,  H04B17/309 ,  H04L27/2602

Abstract: A receiver and method of enhancing transmitted data signals in a wireless communications system includes wirelessly transmitting and receiving a data signal over a wireless channel in the communications system; providing known channel parameters corresponding to the wireless channel; expressing the data signal as an input data vector; replacing indexes in the input data vector having a magnitude greater than one into indexes in the input data vector having a unit norm; creating an output data vector; and calculating a dot product of (i) the input data vector comprising replaced indexes; and (ii) the output data vector, wherein the calculating process equalizes the data signal received by a receiver in the presence of Doppler frequency shifts of the data signal.

Abstract translation: 一种在无线通信系统中增强发射数据信号的接收机和方法包括：在通信系统中通过无线信道无线地发射和接收数据信号; 提供对应于无线信道的已知信道参数; 将数据信号表示为输入数据矢量; 将具有大于1的幅度的输入数据向量中的索引替换为具有单位范数的输入数据向量中的索引; 创建输出数据向量; 并计算（i）包括替代索引的输入数据矢量的点积; 和（ii）所述输出数据矢量，其中所述计算处理在数据信号的多普勒频移的存在下均衡由接收机接收的数据信号。

公开(公告)号：US20070277209A1

公开(公告)日：2007-11-29

申请号：US11440388

申请日：2006-05-24

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04N7/173

CPC classification number: H04N21/64315 ,  H04N21/2381

Abstract: A data transmission system and method for DVB-H signals for enhancing data robustness of a DVB-H receiver in additive white Gaussian noise (AWGN) channels includes transmitting IP datagrams from a DVB-H transmitter to the DVB-H receiver; applying a MPE section and a FEC section to the transmitted IP datagrams; mapping the transmitted IP datagrams to TS packets; aligning boundaries of the transmitted IP datagrams to a given number of TS packets; fixing a size of the IP datagrams to a known value at the DVB-H receiver; and extracting the IP datagrams from the DVB-H receiver.

Abstract translation: 用于增强加性白高斯噪声（AWGN）信道中DVB-H接收机的数据鲁棒性的DVB-H信号的数据传输系统和方法包括从DVB-H发射机向DVB-H接收机发送IP数据报; 将MPE部分和FEC部分应用于所发送的IP数据报; 将传输的IP数据报映射到TS数据包; 将发送的IP数据报的边界对准给定数量的TS分组; 将IP数据报的大小固定在DVB-H接收机的已知值; 并从DVB-H接收机提取IP数据报。

公开(公告)号：US20070030930A1

公开(公告)日：2007-02-08

申请号：US11500561

申请日：2006-08-08

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H03D1/04 ,  H03H7/30

CPC classification number: H04L25/0236 ,  H04L2025/0349

Abstract: A novel approach of repeated adaptation is provided that can be applied to either one or both of channel estimation and/or equalization. From an incoming data packet that includes data and a training sequence, a modified data packet is generated that includes the data, the training sequence, and at least one additional copy of the training sequence. From the format of this modified data packet, the same training sequence can be used over and over again a desired number of times to perform channel estimation and subsequent calculation of equalizer tap coefficients. Alternatively, the same training sequence can be used over and over again a desired number of times to converge the equalizer coefficient taps directly without doing any preliminary channel estimation. Generally, either of these approaches can be characterized as a cyclic adaptation operation that provides improved performance without incurring any reduction in throughput of the communication channel.

Abstract translation: 提供了可以应用于信道估计和/或均衡中的一个或两者的重复适应的新颖方法。 从包括数据和训练序列的输入数据分组中，生成包括数据，训练序列和训练序列的至少一个附加副本的经修改的数据分组。 根据该修改的数据分组的格式，相同的训练序列可以一遍又一遍地使用所需次数，以执行信道估计和随后计算均衡器抽头系数。 或者，相同的训练序列可以一遍又一遍地使用期望次数，以直接收敛均衡器系数抽头，而不进行任何初步信道估计。 通常，这些方法之一可以被表征为循环适应操作，其提供改进的性能，而不会导致通信信道的吞吐量的任何降低。

公开(公告)号：US20070009012A1

公开(公告)日：2007-01-11

申请号：US11522842

申请日：2006-09-18

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

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

IPC: H04B1/00

CPC classification number: H04B7/216 ,  H04B1/71 ,  H04B1/7102 ,  H04B1/7105 ,  H04B1/7107 ,  H04J13/0003 ,  H04J13/16

Abstract: Cancellation of interference in a communication system with application to S-CDMA. A relatively straight-forward implemented and computationally efficient approach of selecting a predetermined number of unused codes is used to perform weighted linear combination selectively with each of the input spread signals in a multiple access communication system. If desired, the predetermined number of unused codes is always the same in each implementation. Alternatively, the predetermined number of unused codes is selected from within a reordered code matrix using knowledge that is shared between the two ends of a communication system, such as between the CMs and a CMTS. While the context of an S-CDMA communication system having CMs and a CMTS is used, the solution is generally applicable to any communication system that seeks to cancel narrowband interference. Several embodiments are also described that show the generic applicability of the solution across a wide variety of systems.

公开(公告)号：US20050047489A1

公开(公告)日：2005-03-03

申请号：US10962803

申请日：2004-10-12

Applicant: Nabil Yousef ,  Thomas Kolze ,  Jonathan Min

Inventor： Nabil Yousef ,  Thomas Kolze ,  Jonathan Min

IPC: H04B1/707 ,  H04J3/06 ,  H04L1/00

CPC classification number: H04N21/6168 ,  H04B1/71 ,  H04B1/7102 ,  H04B1/7103 ,  H04B1/71055 ,  H04B1/71072 ,  H04B2201/709709 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0045 ,  H04L1/005 ,  H04L1/0057

Abstract: A system for mitigating impairment in a communication system includes a delay block, a signal level block, a moving average window block, an impulse noise detection block, and a combiner. The delay block receives and delays each chip of a plurality of chips in a spreading interval. The signal level block determines a signal level of each chip of the plurality of chips in the spreading interval. The moving average window block determines a composite signal level for a chip window corresponding to the chip. The impulse noise detection block receives the signal level, receives the composite signal level, and produces an erasure indication for each chip of the plurality of chips of the corresponding chip window. The combiner erases chips of the plurality of chips of the spreading interval based upon the erasure indication.

Abstract translation: 用于减轻通信系统中的损害的系统包括延迟块，信号电平块，移动平均窗口块，脉冲噪声检测块和组合器。 延迟块在扩展间隔中接收并延迟多个芯片的每个芯片。 信号电平块在扩展间隔中确定多个芯片的每个芯片的信号电平。 移动平均窗口块确定与芯片对应的芯片窗口的复合信号电平。 脉冲噪声检测块接收信号电平，接收复合信号电平，并产生相应芯片窗口的多个芯片的每个芯片的擦除指示。 基于擦除指示，组合器擦除扩展间隔的多个芯片的芯片。

公开(公告)号：US08086940B2

公开(公告)日：2011-12-27

申请号：US12110647

申请日：2008-04-28

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H03M13/00

CPC classification number: H04L1/005 ,  H03M13/09 ,  H03M13/1515 ,  H03M13/2966 ,  H03M13/3746 ,  H03M13/6541 ,  H04L1/0057 ,  H04L1/0064

Abstract: A technique for iterative decoding between turbo and Reed Solomon (RS) decoders for improving bit error rate (BER) and packet error rate (PER) in a receiver in a wireless communication system comprises receiving data samples comprising turbo encoded packets and RS code words at the receiver; decoding turbo encoded packets of the received data samples using a turbo decoder; decoding RS code words of the received data samples using a RS decoder; feeding the RS decoded data to turbo decoder to perform a plurality of iterations; and correcting data errors present in the received data samples.

Abstract translation: 用于在无线通信系统的接收机中改善误码率（BER）和分组差错率（PER）的Turbo和Reed Solomon（RS）解码器之间的迭代解码技术包括：接收包括turbo编码分组和RS码字的数据样本 收件人; 使用turbo解码器解码所接收数据样本的Turbo编码分组; 使用RS解码器对接收的数据样本的RS码字进行解码; 将RS解码的数据馈送到turbo解码器以执行多个迭代; 并校正接收到的数据样本中存在的数据错误。

公开(公告)号：US08077659B2

公开(公告)日：2011-12-13

申请号：US12110671

申请日：2008-04-28

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04W4/00

CPC classification number: H04W64/00

Abstract: Estimating a current location of a receiver in a MediaFLO™ (Forward Link Only) mobile multimedia multicast system comprises receiving digital signals comprising a MediaFLO™ superframe comprising orthogonal frequency division multiplexing (OFDM) symbols; performing slot 3 processing of each medium access control (MAC) time unit of a data channel to identify a transmitter identity (TxID) of each transmitter; identifying corresponding geographical coordinates of each TxID; regenerating the digital signals for each of the transmitters using a local-area differentiator (LID) and a wide-area differentiator (WID) of the transmitters; dividing the digital signals by the corresponding regenerated transmitted signal to obtain channel estimates between the receiver and the corresponding transmitters; detecting a first peak in the channel estimates to determine a distance between the receiver and the corresponding transmitters; calculating a time difference of arrival of the digital signals; and estimating a current location of the receiver.

Abstract translation: 在MediaFLO TM（仅前向链路）移动多媒体多播系统中估计接收机的当前位置包括接收包括包括正交频分复用（OFDM）符号的MediaFLO TM超帧的数字信号; 执行数据信道的每个媒体接入控制（MAC）时间单元的时隙3处理，以识别每个发射机的发射机标识（TxID）; 识别每个TxID的对应地理坐标; 使用所述发射机的局域微分器（LID）和广域微分器（WID）来再生每个发射机的数字信号; 将数字信号除以对应的再生发送信号，以获得接收机与相应发射机之间的信道估计; 检测所述信道估计中的第一峰值以确定所述接收机与所述相应发射机之间的距离; 计算数字信号的到达时间差; 并估计接收机的当前位置。

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。