公开(公告)号：US07974364B2

公开(公告)日：2011-07-05

申请号：US12110688

申请日：2008-04-28

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04L27/00

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: 在MediaFLO TM（仅前向链路）接收机系统中的多普勒频率估计和适应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个插值滤波器的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符号的相关来估计多普勒频率; 确定OFDM符号的相关性的比率; 将所确定的OFDM符号的相关比与存储在接收机处的α查找表进行比较，以确定相应的多普勒频率; 将存储在查找表中的α范围映射到合适的内插滤波器; 根据所确定的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：US07950042B2

公开(公告)日：2011-05-24

申请号：US11303398

申请日：2005-12-16

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04N7/173

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: 降低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：US07944999B2

公开(公告)日：2011-05-17

申请号：US12062774

申请日：2008-04-04

Applicant: Jun Ma ,  Nabil Yousef

Inventor： Jun Ma ,  Nabil Yousef

IPC: H04L27/00

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：US07940865B2

公开(公告)日：2011-05-10

申请号：US12062712

申请日：2008-04-04

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04L27/06

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，所述超帧包括一个或多个 接收机中的正交频分复用（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。

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：US07912142B2

公开(公告)日：2011-03-22

申请号：US12062650

申请日：2008-04-04

Applicant: Jun Ma ,  Nabil Yousef ,  Li Liu

Inventor： Jun Ma ,  Nabil Yousef ,  Li Liu

IPC: H04B15/00

CPC classification number: H04L25/0328

Abstract: An apparatus, method, and system for reducing a C/N in an OFDM receiver using diversity combining techniques in the presence of ICI, wherein the apparatus comprises an encoded data estimator adapted to estimate data received in the OFDM receiver; a pair of ICI estimators operatively connected to the encoded data estimator and adapted to calculate an inter-carrier-interference term of the data; and a pair of diversity combining equalizers adapted to compensate multi-path interference of the data, wherein a first one of the diversity combining equalizers is operatively connected to the encoded data estimator, and a second one of the diversity combining equalizers is operatively connected to the pair of ICI estimators. The diversity combining equalizer may comprise a MRC diversity combining equalizer. Preferably, the encoded data estimator, the pair of ICI estimators, and the pair of diversity combining equalizers are implemented on a DVB-T/H diversity SoC.

Abstract translation: 一种用于在存在ICI的情况下使用分集组合技术减少OFDM接收机中的C / N的装置，方法和系统，其中所述装置包括适于估计在所述OFDM接收机中接收的数据的编码数据估计器; 一对可操作地连接到所述编码数据估计器并且适于计算所述数据的载波间干扰项的ICI估计器; 以及一对组合均衡器的组合均衡器，适于补偿数据的多径干扰，其中分集组合均衡器中的第一个可操作地连接到编码数据估计器，并且分集组合均衡器中的第二个可操作地连接到 一对ICI估计。 分集组合均衡器可以包括MRC分集组合均衡器。 优选地，编码数据估计器，ICI估计器对和分集组合均衡器对在DVB-T / H分集SoC上实现。

公开(公告)号：US07894331B2

公开(公告)日：2011-02-22

申请号：US11850180

申请日：2007-09-05

Applicant: Mirette Sadek ,  Nabil Yousef

Inventor： Mirette Sadek ,  Nabil Yousef

IPC: H04J11/00 ,  H04K1/10 ,  H04B7/216

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：US20090271684A1

公开(公告)日：2009-10-29

申请号：US12110647

申请日：2008-04-28

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: G06F11/16

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：US20090268665A1

公开(公告)日：2009-10-29

申请号：US12110671

申请日：2008-04-28

Applicant: Nabil Yousef

Inventor： Nabil Yousef

IPC: H04Q7/00

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: 估计MediaFLO TM（仅前向链路）移动多媒体多播系统中的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：US20090252237A1

公开(公告)日：2009-10-08

申请号：US12062650

申请日：2008-04-04

Applicant: Jun Ma ,  Nabil Yousef ,  Li Liu

Inventor： Jun Ma ,  Nabil Yousef ,  Li Liu

IPC: H04L27/28

CPC classification number: H04L25/0328

Abstract: An apparatus, method, and system for reducing a C/N in an OFDM receiver using diversity combining techniques in the presence of ICI, wherein the apparatus comprises an encoded data estimator adapted to estimate data received in the OFDM receiver; a pair of ICI estimators operatively connected to the encoded data estimator and adapted to calculate an inter-carrier-interference term of the data; and a pair of diversity combining equalizers adapted to compensate multi-path interference of the data, wherein a first one of the diversity combining equalizers is operatively connected to the encoded data estimator, and a second one of the diversity combining equalizers is operatively connected to the pair of ICI estimators. The diversity combining equalizer may comprise a MRC diversity combining equalizer. Preferably, the encoded data estimator, the pair of ICI estimators, and the pair of diversity combining equalizers are implemented on a DVB-T/H diversity SoC.

Abstract translation: 一种用于在存在ICI的情况下使用分集组合技术减少OFDM接收机中的C / N的装置，方法和系统，其中所述装置包括适于估计在所述OFDM接收机中接收的数据的编码数据估计器; 一对可操作地连接到所述编码数据估计器并且适于计算所述数据的载波间干扰项的ICI估计器; 以及一对组合均衡器的组合均衡器，适于补偿数据的多径干扰，其中分集组合均衡器中的第一个可操作地连接到编码数据估计器，并且分集组合均衡器中的第二个可操作地连接到 一对ICI估计。 分集组合均衡器可以包括MRC分集组合均衡器。 优选地，编码数据估计器，ICI估计器对和分集组合均衡器对在DVB-T / H分集SoC上实现。