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1. 发明申请

US20070053470A1 Iterative data-aided carrier frequency offset estimation for code division multiple access systems 有权
公开(公告)号：US20070053470A1
公开(公告)日：2007-03-08
申请号：US11592286
申请日：2006-11-02
申请人： Nabil Yousef , Jun Ma , Jonathan Min
发明人： Nabil Yousef , Jun Ma , Jonathan Min
IPC分类号： H04L27/06
CPC分类号： H04B1/707 , H04B2201/70701 , H04L2027/0055
摘要： Iterative data-aided carrier CFO estimation for CDMA systems. Any communication receiver may be adapted to perform the iterative data-aided carrier CFO estimation. The iterative data-aided carrier CFO estimation is performed using a high accuracy method. The operation may be described as follows: a received signal is despread and buffered. Using the received preamble sequence, an initial estimate of the CFO is obtained. This estimate is used to correct the whole despread data. The corrected data using the initial CFO estimate is sliced. Each despread data symbol is divided by the corresponding sliced data decision. The obtained sequence is then averaged across different codes to obtain a less noisy sequence, which is then used to estimate the CFO again. The procedure can be repeated (iterated) to obtain a more accurate carrier frequency offset estimate; the number of times in which the procedure is repeated may be programmable or predetermined.

2. 发明授权

US07599441B2 Low complexity soft-input Viterbi decoding for digital communication systems 有权
标题翻译：用于数字通信系统的低复杂度软输入维特比解码
公开(公告)号：US07599441B2
公开(公告)日：2009-10-06
申请号：US11471187
申请日：2006-06-20
申请人： Jun Ma , Nabil Yousef
发明人： Jun Ma , Nabil Yousef
IPC分类号： H04L5/12 , H04L23/02 , H04L27/06
CPC分类号： H04L25/067 , H04L1/0041 , H04L1/0052 , H04L1/0054 , H04L1/006 , H04L1/0071 , H04L27/34 , H04L27/38
摘要： 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.
摘要翻译： 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。

3. 再颁专利

USRE44622E1 Coarse carrier frequency offset estimation for a receiver 有权
标题翻译：接收机的粗载波频偏估计
公开(公告)号：USRE44622E1
公开(公告)日：2013-12-03
申请号：US13645489
申请日：2012-10-04
申请人： Xiaoyu Fu , Jun Ma , Nabil Yousef
发明人： Xiaoyu Fu , Jun Ma , Nabil Yousef
IPC分类号： H04K1/10
CPC分类号： H04L27/2676 , H04L27/2659
摘要： 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 communication 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.
摘要翻译：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）移动电视通信网络包括将接收到的采样Ykj划分为两组仅噪声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失配时才获得接收的采样将所述数据的功率和噪声音调的加和除以所述仅噪声音调的功率的和，以获得Lambdakj，并且估计所接收到的所述接收到的噪声音调的整数粗略频率偏移估计值Delta（f（f）} Ij）当Lambdakj是最大值时的符号。

4. 发明授权

US07944999B2 Robust fine frequency and time estimation in mobile multimedia multicast system receivers 有权
标题翻译：在移动多媒体多播系统接收机中的鲁棒精细频率和时间估计
公开(公告)号：US07944999B2
公开(公告)日：2011-05-17
申请号：US12062774
申请日：2008-04-04
申请人： Jun Ma , Nabil Yousef
发明人： Jun Ma , Nabil Yousef
IPC分类号： H04L27/00
CPC分类号： H04L27/2657 , H04L27/2662 , H04L27/2675
摘要： 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.
摘要翻译：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。

5. 发明授权

US07912142B2 Double layer maximum ratio combining for an OFDM receiver with inter-carrier-interference cancelling 有权
标题翻译：双层最大比组合用于具有载波间干扰消除的OFDM接收机
公开(公告)号：US07912142B2
公开(公告)日：2011-03-22
申请号：US12062650
申请日：2008-04-04
申请人： Jun Ma , Nabil Yousef , Li Liu
发明人： Jun Ma , Nabil Yousef , Li Liu
IPC分类号： H04B15/00
CPC分类号： H04L25/0328
摘要： 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.
摘要翻译：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。

6. 发明申请

US20090252237A1 DOUBLE LAYER MAXIMUM RATIO COMBINING FOR OFDM RECEIVER DESIGN WITH INTER-CARRIER-INTERFERENCE CANCELLING 有权
标题翻译：用于OFDM接收机设计的双层最大比率组合，具有帧间干扰消除
公开(公告)号：US20090252237A1
公开(公告)日：2009-10-08
申请号：US12062650
申请日：2008-04-04
申请人： Jun Ma , Nabil Yousef , Li Liu
发明人： Jun Ma , Nabil Yousef , Li Liu
IPC分类号： H04L27/28
CPC分类号： H04L25/0328
摘要： 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.
摘要翻译：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。

7. 再颁专利

USRE44776E1 Robust fine frequency and time estimation in mobile receivers 有权
标题翻译：移动接收机中稳健的精细频率和时间估计
公开(公告)号：USRE44776E1
公开(公告)日：2014-02-25
申请号：US13645498
申请日：2012-10-04
申请人： Jun Ma , Nabil Yousef
发明人： Jun Ma , Nabil Yousef
IPC分类号： H04L27/00
CPC分类号： H04L27/2657 , H04L27/2662 , H04L27/2675
摘要： A technique for estimating a carrier frequency offset and a timing offset in a MediaFLO™ (Forward Link Only) communication system, wherein the method comprises includes 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.
摘要翻译：一种用于估计MediaFLO TM（仅前向链路）通信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。

8. 发明授权

US08169546B2 Technique for tuner automatic gain control circuit for mobile television applications 有权
标题翻译：用于移动电视应用的调谐器自动增益控制电路技术
公开(公告)号：US08169546B2
公开(公告)日：2012-05-01
申请号：US12033323
申请日：2008-02-19
申请人： Xiaoyu Fu , Jun Ma , Waleed M. Younis , Nabil Yousef , Janakan Sivasubramaniam , Edward Youssoufian
发明人： Xiaoyu Fu , Jun Ma , Waleed M. Younis , Nabil Yousef , Janakan Sivasubramaniam , Edward Youssoufian
IPC分类号： H04N5/52 , H04N3/27 , H04N5/00 , H04N5/44 , H04B1/40 , H04B17/02 , H04B1/06 , H04B7/00 , H04B1/26 , H04B1/00 , H04L27/06 , H04L17/08
CPC分类号： H04N5/52 , H03G3/001 , H03G3/3068 , H04N5/4446
摘要： A technique for providing stable tracking performance to an AGC loop circuit comprises amplifying a wideband radio frequency signal; detecting signals and blockers adjacent to the radio frequency signal; lowering a gain of the radio frequency signal; mixing a local oscillator signal with the radio frequency signal; shifting a frequency of the radio frequency signal from a radio frequency to an intermediate frequency; continuously varying a gain of the intermediate frequency signal; converting the intermediate frequency signal into a digital output signal; comparing the digital output signal with predefined thresholds comprising an upper threshold and a lower threshold; switching a post mixer amplifier (PMA) to a high gain state when an input of a variable gain amplifier (VGA) is greater than the upper threshold, and switching the PMA to a low gain state when an input of the VGA is lower than the lower threshold.
摘要翻译：一种用于向AGC环路电路提供稳定跟踪性能的技术包括放大宽带射频信号; 检测与射频信号相邻的信号和阻塞; 降低射频信号的增益; 将本地振荡器信号与射频信号混合; 将射频信号的频率从射频转换到中频; 连续地改变中频信号的增益; 将所述中频信号转换为数字输出信号; 将数字输出信号与包括上阈值和下阈值的预定义阈值进行比较; 当可变增益放大器（VGA）的输入大于上阈值时，将后混频器放大器（PMA）切换到高增益状态，并且当VGA的输入低于该阈值时，将PMA切换到低增益状态较低的门槛。

9. 发明授权

US07970070B2 Adaptive frequency domain equalization in OFDM based communication system 有权
标题翻译：基于OFDM的通信系统中的自适应频域均衡
公开(公告)号：US07970070B2
公开(公告)日：2011-06-28
申请号：US12120505
申请日：2008-05-14
申请人： Nabil Yousef , Jun Ma , Yongru Gu
发明人： Nabil Yousef , Jun Ma , Yongru Gu
IPC分类号： H04K1/10
CPC分类号： H04L25/03159 , H04L25/0216 , H04L25/0232 , H04L27/2601
摘要： An apparatus, system, and method of performing adaptive frequency domain equalization in an Orthogonal Frequency Domain Multiplexing (OFDM) based communication system transmitting data information, wherein the method comprises receiving OFDM symbols comprising scattered pilots; obtaining channel estimates on every third bin of the scattered pilots in a frequency domain, wherein the channel estimates are obtained by performing an interpolation in a time domain across the received OFDM symbols; estimating an original channel based on the channel estimates, wherein the original channel in the time domain is estimated by applying a finite impulse response (FIR) low-pass filter in a frequency domain, wherein the FIR low-pass filter is adaptive according to a delay span of an original channel impulse response and is sufficiently wide to cover the delay span of the original channel impulse response; and dividing the received OFDM symbols by the channel estimate to obtain transmitted data information.
摘要翻译：一种在基于正交频域复用（OFDM）的基于OFDM的通信系统中执行自适应频域均衡的装置，系统和方法，该方法包括：接收包含散射飞行员的OFDM符号; 在频域中获得所述散射导频的每第三个二进制的信道估计，其中所述信道估计是通过在所接收的OFDM符号中的时域执行内插而获得的; 基于信道估计来估计原始信道，其中通过在频域中应用有限脉冲响应（FIR）低通滤波器来估计时域中的原始信道，其中，FIR低通滤波器根据原始信道脉冲响应的延迟范围，并且足够宽以覆盖原始信道脉冲响应的延迟范围; 并且将所接收的OFDM符号除以信道估计以获得发送的数据信息。

10. 发明申请

US20090285314A1 ADAPTIVE FREQUENCY DOMAIN EQUALIZATION IN OFDM BASED COMMUNICATION SYSTEM 有权
标题翻译：基于OFDM的通信系统的自适应频域均衡
公开(公告)号：US20090285314A1
公开(公告)日：2009-11-19
申请号：US12120505
申请日：2008-05-14
申请人： Nabil Yousef , Jun Ma , Yongru Gu
发明人： Nabil Yousef , Jun Ma , Yongru Gu
IPC分类号： H04L27/28
CPC分类号： H04L25/03159 , H04L25/0216 , H04L25/0232 , H04L27/2601
摘要： An apparatus, system, and method of performing adaptive frequency domain equalization in an Orthogonal Frequency Domain Multiplexing (OFDM) based communication system transmitting data information, wherein the method comprises receiving OFDM symbols comprising scattered pilots; obtaining channel estimates on every third bin of the scattered pilots in a frequency domain, wherein the channel estimates are obtained by performing an interpolation in a time domain across the received OFDM symbols; estimating an original channel based on the channel estimates, wherein the original channel in the time domain is estimated by applying a finite impulse response (FIR) low-pass filter in a frequency domain, wherein the FIR low-pass filter is adaptive according to a delay span of an original channel impulse response and is sufficiently wide to cover the delay span of the original channel impulse response; and dividing the received OFDM symbols by the channel estimate to obtain transmitted data information.
摘要翻译：一种在基于正交频域复用（OFDM）的基于OFDM的通信系统中执行自适应频域均衡的装置，系统和方法，该方法包括：接收包含散射飞行员的OFDM符号; 在频域中获得所述散射导频的每第三个二进制的信道估计，其中所述信道估计是通过在所接收的OFDM符号中的时域执行内插而获得的; 基于信道估计来估计原始信道，其中通过在频域中应用有限脉冲响应（FIR）低通滤波器来估计时域中的原始信道，其中，FIR低通滤波器根据原始信道脉冲响应的延迟范围，并且足够宽以覆盖原始信道脉冲响应的延迟范围; 并且将所接收的OFDM符号除以信道估计以获得发送的数据信息。

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