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51. 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。

52. 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。

53. 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）。

54. 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。

55. 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。

56. 发明授权

US08750418B2 Symbol vector-level combining transmitter for incremental redundancy HARQ with MIMO 有权
标题翻译：符号矢量级组合发射机，用于增量冗余HARQ与MIMO
公开(公告)号：US08750418B2
公开(公告)日：2014-06-10
申请号：US12463017
申请日：2009-05-08
申请人： Jungwon Lee , Yakun Sun , Hui-Ling Lou
发明人： Jungwon Lee , Yakun Sun , Hui-Ling Lou
IPC分类号： H04L27/00
CPC分类号： H04B7/024 , H04B7/0413 , H04L1/0042 , H04L1/0068 , H04L1/0643 , H04L1/1819
摘要： Techniques are provided for transmitting and receiving a mother code in an incremental redundancy hybrid automatic repeat-request protocol. A set of information bits corresponding to a message may be encoded and interleaved to produce the mother code. Each bit position of the mother code may be mapped to an output symbol, and each output symbol may be mapped to an antenna for transmission. One or more transmissions of symbols contained in the output symbols may be performed, where each transmission may include puncturing the mother code by selecting one or more symbols from the of output symbols, and transmitting each symbol in the one or more symbols on an antenna corresponding to that symbol. The mother code may be decoded, in part, by determining combinable bits contained within a set of received symbols, and computing one or more log-likelihood ratio values corresponding to each symbol in the set of received symbols.
摘要翻译：提供了用于以增量冗余混合自动重复请求协议发送和接收母码的技术。对应于消息的一组信息位可以被编码和交织以产生母码。母码的每个比特位置可以被映射到输出符号，并且每个输出符号可以被映射到天线以进行传输。可以执行输出符号中包含的符号的一个或多个传输，其中每个传输可以包括通过从输出符号中选择一个或多个符号来对母码进行穿刺，并且在天线上的一个或多个符号中发送每个符号到那个符号。可以部分地通过确定包含在一组接收到的符号内的可组合比特，以及计算与所接收的符号集合中的每个符号相对应的一个或多个对数似然比值来对母码进行解码。

57. 发明授权

US08665694B2 Pilot design for universal frequency reuse in cellular orthogonal frequency-division multiplexing systems 有权
标题翻译：蜂窝正交频分复用系统中通用频率复用的导频设计
公开(公告)号：US08665694B2
公开(公告)日：2014-03-04
申请号：US12189437
申请日：2008-08-11
申请人： Jungwon Lee , Hui-Ling Lou
发明人： Jungwon Lee , Hui-Ling Lou
IPC分类号： H04J1/12
CPC分类号： H04L5/0048 , H04L5/0062 , H04L5/0073
摘要： Systems and methods are provided for transmitting information between an intended source and a receiver to minimize co-channel interference from at least one interfering source. Pilot subcarriers and data subcarriers may be broadcast from an intended source arid at least one interfering source. The pilot subcarriers may be shared across base stations or distributed among base stations in frequency, in time, or both. In addition, the frequency reuse factor of the pilot subcarriers may be different than the frequency reuse factor of the data subcarriers. A receiver receives a composite signal that corresponds with an intended signal from an intended source and an interfering signal from at least one interfering source. The portion of the received signal that corresponds to the intended signal may be recovered by the receiver based on the broadcast of the pilot subcarriers.
摘要翻译：提供了系统和方法，用于在预期的源和接收机之间传输信息以最小化来自至少一个干扰源的同信道干扰。导频子载波和数据子载波可以从预期的源和至少一个干扰源广播。导频子载波可以在基站之间共享或者在频率，时间上或两者中分布在基站之间。此外，导频子载波的频率重用因子可能不同于数据子载波的频率重用因子。接收机接收来自预期源的预期信号和来自至少一个干扰源的干扰信号的复合信号。对应于预期信号的接收信号的部分可以由接收机基于导频子载波的广播来恢复。

58. 发明授权

US08654910B1 Co-channel interference cancellation with multiple receive antennas for BICM 有权
标题翻译：用于BICM的多个接收天线的同信道干扰消除
公开(公告)号：US08654910B1
公开(公告)日：2014-02-18
申请号：US13570750
申请日：2012-08-09
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： H03D1/04
CPC分类号： H04L25/0206 , H04L25/0228 , H04L25/03331
摘要： Apparatus and methods are provided for computing soft information at a receiver having a plurality of receive antennas. The receiver may be a mobile station or a base station, and can receive a signal vector that includes an intended signal from a first source as well as interfering signals from one or more other, interfering sources. The receiver can determine modulation information, such as the modulation scheme, used by each of the interfering sources. The mobile station can also estimate channel information, such as channel gain information, associated with each interfering source. Using the modulation and channel information, the receiver can compute soft information, such as a log-likelihood ratio. In some embodiments, the receiver can adaptively determine which interference sources and which receive antennas to use when computing the soft information.
摘要翻译：提供了用于在具有多个接收天线的接收机处计算软信息的装置和方法。接收机可以是移动站或基站，并且可以接收包括来自第一源的预期信号以及来自一个或多个其它干扰源的干扰信号的信号向量。接收机可以确定由每个干扰源使用的调制方式，例如调制方案。移动站还可以估计与每个干扰源相关联的信道信息，例如信道增益信息。使用调制和信道信息，接收机可以计算软信息，例如对数似然比。在一些实施例中，当计算软信息时，接收机可以自适应地确定哪些干扰源和哪些接收天线使用。

59. 发明授权

US08611480B1 Optimal decoding of transmit diversity code with varying channel characteristics 有权
公开(公告)号：US08611480B1
公开(公告)日：2013-12-17
申请号：US12055256
申请日：2008-03-25
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： H04B7/10 , H04L1/02
CPC分类号： H04B7/08 , H04B1/10 , H04B7/0669 , H04B7/0845 , H04L1/0631 , H04L1/0668
摘要： Systems and methods are provided for decoding a signal vector in a transmit diversity scheme for varying channels. Information obtained in more than one symbol period are treated as a single received vector, and each of the received signal vectors may be processed to reduce the effects of varying channel characteristics. The received signal vectors may be combined by addition and decoded using a maximum-likelihood decoder. In some embodiments, the received signal vectors are processed separately and then combined. In other embodiments, the received signal vectors are combined and then processed. In some embodiments, zero-forced linear equalization techniques are used to processed the received signals. In some embodiments the signal vectors and varying channel response matrices are broken down to equivalent forms in order to simplify the processing.

60. 发明授权

US08437434B1 Multi-stream maximum-likelihood demodulation based on bitwise constellation partitioning 有权
标题翻译：基于逐位星座分割的多流最大似然解调
公开(公告)号：US08437434B1
公开(公告)日：2013-05-07
申请号：US13567960
申请日：2012-08-06
申请人： Jungwon Lee , Jiwoong Choi , Hui-Ling Lou
发明人： Jungwon Lee , Jiwoong Choi , Hui-Ling Lou
IPC分类号： H03D1/00 , H04L27/06
CPC分类号： H04L25/03203 , H04L25/03331
摘要： A plurality of received data symbols is received, and a first received data symbol is selected from the plurality of received data symbols. A plurality of global optimum candidate values of a first estimated transmitted data symbol corresponding to the first received data symbol is determined for different given candidate values of second estimated transmitted data symbols corresponding to second received data symbols. Likelihood values for bits corresponding to the second estimated transmitted data symbols are calculated using the plurality of global optimum candidate values. All possible values of the first estimated transmitted data symbol are grouped into two or more bit groups, and a plurality of local optimum candidate values are determined for different bit groups. Likelihood values for bits corresponding to the first estimated transmitted data symbol are calculated using the plurality of global optimum candidate values and the plurality of local optimum candidate values.
摘要翻译：接收多个接收到的数据符号，并且从多个接收的数据符号中选择第一接收数据符号。针对对应于第二接收数据符号的第二估计发送数据符号的不同给定候选值确定与第一接收数据符号对应的第一估计发送数据符号的多个全局最优候选值。使用多个全局最优候选值来计算与第二估计发送数据符号对应的位的似然值。第一估计发送数据符号的所有可能值被分组为两个或多个位组，并且针对不同位组确定多个局部最优候选值。使用多个全局最优候选值和多个局部最优候选值来计算与第一估计发送数据符号对应的位的似然值。

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