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51. 发明授权

US07995666B1 Frame synchronization method and apparatus 有权
标题翻译：帧同步方法和装置
公开(公告)号：US07995666B1
公开(公告)日：2011-08-09
申请号：US12899928
申请日：2010-10-07
申请人： Qing Zhao , Jungwon Lee , Leilei Song , Songping Wu , Hui-Ling Lou
发明人： Qing Zhao , Jungwon Lee , Leilei Song , Songping Wu , Hui-Ling Lou
IPC分类号： H04K1/10 , H04L27/28
CPC分类号： H04L27/2656 , H04L27/2676
摘要： In a method for synchronizing a receiver to a synchronous signal, in a signal having been processed based on an automatic gain control (AGC) with a varying gain, a symbol is detected. An estimated beginning of a subsequent frame is determined based on the detected symbol. A gain of the AGC is fixed for a period during which the estimated start of the subsequent frame is processed by the AGC. A transform of the signal is analyzed to determine if the estimated start of the subsequent frame corresponds to an actual start of the subsequent frame. If the estimated start of the subsequent frame does not corresponds to the actual start of the subsequent frame, the gain of the AGC is allowed to resume varying and, a further symbol in the signal is detected, the signal having been processed based on the varying gain of the AGC.
摘要翻译：在用于将接收机同步到同步信号的方法中，在基于具有变化增益的自动增益控制（AGC）处理的信号中，检测到符号。基于检测到的符号确定后续帧的估计开始。 AGC的增益在AGC期间处理后续帧的估计开始的期间是固定的。分析信号的变换以确定后续帧的估计开始是否对应于后续帧的实际开始。如果后续帧的估计开始不对应于后续帧的实际开始，则允许AGC的增益恢复变化，并且检测到信号中的另外的符号，该信号已经根据变化增益AGC。

52. 发明授权

US07813436B1 Frame synchronization method and apparatus 有权
标题翻译：帧同步方法和装置
公开(公告)号：US07813436B1
公开(公告)日：2010-10-12
申请号：US11851115
申请日：2007-09-06
申请人： Qing Zhao , Jungwon Lee , Leilei Song , Songping Wu , Hui-Ling Lou
发明人： Qing Zhao , Jungwon Lee , Leilei Song , Songping Wu , Hui-Ling Lou
IPC分类号： H04K1/10 , H04L27/28
CPC分类号： H04L27/2656 , H04L27/2676
摘要： In a method for synchronizing a receiver to a synchronous signal, a plurality of potential symbols are detected in a signal, the signal having been processed based on automatic gain control (AGC) with a varying gain. Next frame potential symbols corresponding to potential symbols in the plurality of potential symbols are determined, the next frame potential symbols being in frames subsequent to the frames in which the corresponding potential symbols are located. A gain of the AGC is fixed for each corresponding symbol interval during which a next frame potential symbol is operated on by the AGC. In between next frame potential symbols, the AGC is allowed to vary. Next frame potential symbols are analyzed after a transform is calculated to determine if any correspond to a start of a frame.
摘要翻译：在将接收机同步到同步信号的方法中，在信号中检测多个电位符号，该信号已经基于具有变化增益的自动增益控制（AGC）来处理。确定与多个电位符号中的电位符号相对应的下一帧电位符号，下一个电位符号位于相应电位符号位于的帧之后的帧中。对于每个对应的符号间隔，AGC的增益是固定的，在该间隔期间，由AGC操作下一个帧电位符号。在下一帧电势符号之间，允许AGC变化。在计算变换之后分析下一帧电位符号，以确定是否有对应于帧的开始。

53. 发明授权

US07639733B1 Maximum likelihood estimation of time and frequency offset for OFDM systems 有权
标题翻译： OFDM系统的时间和频率偏移的最大似然估计
公开(公告)号：US07639733B1
公开(公告)日：2009-12-29
申请号：US12194445
申请日：2008-08-19
申请人： Jungwon Lee , Hui-Ling Lou , Dimitrios-Alexandros Toumpakaris
发明人： Jungwon Lee , Hui-Ling Lou , Dimitrios-Alexandros Toumpakaris
IPC分类号： H04L27/30
CPC分类号： H04L27/2657 , H04L27/2662 , H04L27/2678
摘要： A receiver in an OFDM system may include a joint maximum likelihood (ML) estimator that estimates both time offset and frequency offset. The estimator may use samples in an observation window to estimate the time offset and frequency offset.
摘要翻译： OFDM系统中的接收机可以包括估计时间偏移和频率偏移的联合最大似然（ML）估计器。估计器可以使用观测窗口中的样本来估计时间偏移和频率偏移。

54. 发明授权

US07596182B1 Optimum symbol timing estimation with various performance measures for OFDM systems 有权
标题翻译：用于OFDM系统的各种性能测量的最佳符号定时估计
公开(公告)号：US07596182B1
公开(公告)日：2009-09-29
申请号：US11002786
申请日：2004-12-01
申请人： Jungwon Lee , Dimitrios-Alexandros Toumpakaris , Hui-Ling Lou
发明人： Jungwon Lee , Dimitrios-Alexandros Toumpakaris , Hui-Ling Lou
IPC分类号： H04L5/12 , H04L27/06 , H03M13/03
CPC分类号： H04L27/2662 , H04L27/2676
摘要： A receiver in an OFDM system may include a multi-mode estimator to estimate symbol timing offset for different performance measures. In addition to a maximum likelihood estimation mode, the estimator may have a minimum failure probability estimation mode, a minimum mean square error estimation mode, and a minimum modified mean square error estimation mode.
摘要翻译： OFDM系统中的接收机可以包括用于针对不同性能测量来估计符号定时偏移的多模估计器。除了最大似然估计模式之外，估计器可以具有最小故障概率估计模式，最小均方误差估计模式和最小修正均方误差估计模式。

55. 发明授权

US07587170B1 Digital radio data system receiver methods and apparatus 有权
标题翻译：数字无线电数据系统接收机的方法和装置
公开(公告)号：US07587170B1
公开(公告)日：2009-09-08
申请号：US11488437
申请日：2006-07-17
申请人： Jungwon Lee , Dimitrios-Alexandros Toumpakaris , Hui-Ling Lou , Chris Cheng-Chieh Lee
发明人： Jungwon Lee , Dimitrios-Alexandros Toumpakaris , Hui-Ling Lou , Chris Cheng-Chieh Lee
IPC分类号： H04B1/16
CPC分类号： H04L27/2334 , H04B1/1653 , H04H20/34 , H04H40/18 , H04H2201/13
摘要： Methods and apparatus are provided for receiving a first signal and generating an output signal indicative of radio data system (“RDS”) information. A receiver circuit of the invention can include mixer circuitry, lowpass filter circuitry, downsampler circuitry, and decoder circuitry. Advantageously, the receiver circuit can operate entirely within the digital domain, promoting interoperability with digital frequency modulation (“FM”) demodulator circuitry.
摘要翻译：提供了用于接收第一信号并产生指示无线电数据系统（“RDS”）信息的输出信号的方法和装置。本发明的接收机电路可以包括混频器电路，低通滤波器电路，下采样器电路和解码器电路。有利地，接收器电路可以完全在数字域内操作，促进与数字频率调制（“FM”）解调器电路的互操作性。

56. 发明授权

US07570722B1 Carrier frequency offset estimation for OFDM systems 有权
标题翻译： OFDM系统的载波频率偏移估计
公开(公告)号：US07570722B1
公开(公告)日：2009-08-04
申请号：US10986082
申请日：2004-11-10
申请人： Jungwon Lee , Dimitrios-Alexandros Toumpakaris , Hui-Ling Lou
发明人： Jungwon Lee , Dimitrios-Alexandros Toumpakaris , Hui-Ling Lou
IPC分类号： H04L27/06 , H03K9/00
CPC分类号： H04L27/2657 , H04B7/01
摘要： A system comprises a receiver module that receives a signal that is modulated using coherent orthogonal frequency division multiplexing (OFDM) modulation. A signal to noise ratio (SNR) module communicates with the receiver module and generates a SNR estimate based on the OFDM signal. An estimator module communicates with the SNR module and estimates carder frequency offset (CFO) based on the SNR estimate. System for orthogonal frequency division multiplexing (OFDM) signals such as frequency differential demodulation and time differential demodulation are also described.
摘要翻译：一种系统包括接收模块，该模块接收使用相干正交频分复用（OFDM）调制调制的信号。信噪比（SNR）模块与接收机模块通信，并且基于OFDM信号产生SNR估计。估计器模块与SNR模块通信，并且基于SNR估计来估计载波频率偏移（CFO）。还描述了用于正交频分复用（OFDM）信号的系统，例如频率差分解调和时间差分解调。

57. 发明申请

US20090051592A1 Pseudo-Omni-Directional Beamforming with Multiple Narrow-Band Beams 有权
标题翻译：具有多个窄带束的伪全向波束成形
公开(公告)号：US20090051592A1
公开(公告)日：2009-02-26
申请号：US12197527
申请日：2008-08-25
申请人： Jungwon Lee , Hui-Ling Lou
发明人： Jungwon Lee , Hui-Ling Lou
IPC分类号： H01Q3/00
CPC分类号： H04W24/10 , H04B7/0408 , H04B7/0617 , H04B7/0632 , H04W16/28
摘要： In a technique for communication with a station on a wireless network, the technique includes forming a plurality of narrow-band beams, each having a different angular direction from an antenna of a base station and collectively distributed over a beamspace to form a pseudo-omni-directional beam pattern. That beamspace may span an entire spherical region or a portion thereof, for example, when the narrow-band beams are broadcast over a sector of an entire spherical region. The technique may assign each of the plurality of narrow-band beams to a different frequency band (such as a different channel band or sub-channel) on the wireless network. The technique may simultaneously broadcast the plurality of narrow-band beams in a time-varying manner such that the angular direction of each of the plurality of narrow-band beams varies with time, where that variation may be random or ordered.
摘要翻译：在用于与无线网络上的站通信的技术中，该技术包括形成多个窄带波束，每个窄带波束具有与基站的天线不同的角度方向，并且共同分布在波束空间上以形成伪全波段方向光束图案。该波束空间可以跨越整个球形区域或其一部分，例如当窄带波束在整个球形区域的扇区上广播时。该技术可以将多个窄带波束中的每一个分配给无线网络上的不同频带（例如，不同的信道频带或子信道）。该技术可以以时变方式同时广播多个窄带波束，使得多个窄带波束中的每一个的角度方向随时间变化，其中该变化可以是随机的或有序的。

58. 发明申请

US20080279317A1 BICM DECODING IN THE PRESENCE OF CO-CHANNEL INTERFERENCE 有权
标题翻译： BICM解码存在共通道干扰
公开(公告)号：US20080279317A1
公开(公告)日：2008-11-13
申请号：US12119264
申请日：2008-05-12
申请人： Jungwon Lee , Rohit U. Nabar , Hui-Ling Lou
发明人： Jungwon Lee , Rohit U. Nabar , Hui-Ling Lou
IPC分类号： H04B1/10
CPC分类号： H04B1/1027 , H04L25/067
摘要： Systems and methods are provided for computing soft information for digital information based on a received signal, where the received signal suffers from noise and interference. A receiver that decodes the received signal may estimate channel information, such as the channel gain, associated with the interfering source. The receiver may also obtain modulation information through a backbone network or by decoding control information transmitted by the interfering source. Using the modulation information and the channel information, the receiver may estimate the effect that interference has on the received signal, and may compute soft information (e.g., a log-likelihood ratio) for the digital information.
摘要翻译：提供了系统和方法，用于基于接收到的信号来计算用于数字信息的软信息，其中所接收的信号受到噪声和干扰的影响。对接收到的信号进行解码的接收机可以估计与干扰源相关联的信道信息，例如信道增益。接收机还可以通过骨干网获得调制信息，或通过解码由干扰源发送的控制信息。使用调制信息和信道信息，接收机可以估计干扰对接收信号的影响，并且可以计算数字信息的软信息（例如，对数似然比）。

59. 发明申请

US20070217552A1 Preamble detection with unknown channel 有权
标题翻译：前导码检测与未知信道
公开(公告)号：US20070217552A1
公开(公告)日：2007-09-20
申请号：US11648735
申请日：2006-12-29
申请人： Jungwon Lee , Hui-Ling Lou
发明人： Jungwon Lee , Hui-Ling Lou
IPC分类号： H04L27/06 , H04K1/10
CPC分类号： H04L27/2656 , H04L5/023 , H04L27/2662 , H04L27/2676
摘要： A system includes a differential demodulation module and a correlation module. The differential demodulation module differentially demodulates modulated signals to generate differentially demodulated signals. The correlation module correlates the differentially demodulated signals with derived preamble sequences and generates correlation values.
摘要翻译：一种系统包括差分解调模块和相关模块。差分解调模块差分解调调制信号以产生差分解调信号。相关模块将差分解调信号与导出的前导序列相关，并产生相关值。

60. 发明授权

US08781020B1 Transmit beamforming utilizing channel estimation matrix decomposition feedback in a wireless MIMO communication system 有权
标题翻译：使用无线MIMO通信系统中的信道估计矩阵分解反馈来发射波束成形
公开(公告)号：US08781020B1
公开(公告)日：2014-07-15
申请号：US13555919
申请日：2012-07-23
申请人： Jungwon Lee , Rohit U. Nabar , Hui-Ling Lou
发明人： Jungwon Lee , Rohit U. Nabar , Hui-Ling Lou
IPC分类号： H04B7/02
CPC分类号： H04B7/0665
摘要： A channel estimation matrix H describing a forward channel in which a signal travels from a first communication device to a second communication device is determined at the second communication device. QR decomposition on the channel estimation matrix H is performed, at the second communication device, to derive a unitary matrix Q and an upper triangular matrix R, such that H=QR. Only a portion of the upper triangular matrix R is transmitted, from the second communication device to the first communication device, so that the first communication device can use the portion of the upper triangular matrix R to precode signals to be transmitted by the first communication device.
摘要翻译：在第二通信设备处确定描述信号从第一通信设备行进到第二通信设备的前向信道的信道估计矩阵H。在第二通信设备处执行在信道估计矩阵H上的QR分解以导出酉矩阵Q和上三角矩阵R，使得H = QR。只有上层三角矩阵R的一部分从第二通信装置传送到第一通信装置，使得第一通信装置可以使用上三角矩阵R的部分来对第一通信装置发送的信号进行预编码。

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