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91. 发明授权

US08107542B1 Soft decoding of coded bit-streams 有权
标题翻译：编码比特流的软解码
公开(公告)号：US08107542B1
公开(公告)日：2012-01-31
申请号：US10923066
申请日：2004-08-20
申请人： Hui-ling Lou , Dimitrios-Alexandros Toumpakaris , Jungwon Lee
发明人： Hui-ling Lou , Dimitrios-Alexandros Toumpakaris , Jungwon Lee
IPC分类号： H04L25/00
CPC分类号： H03M7/46 , H04L1/0054 , H04L1/006 , H04L1/0067 , H04L1/0071 , H04L27/34
摘要： A wireless system may transmit multiple bit streams representing the same information but with the coded bits being transmitted with different repeat transmission factors. The receiver may derive appropriate combining metrics to optimize decoder performance, while eliminating complicated multiplication operations. The receiver may utilize different soft combining metrics for different bit-to-symbols mappings and types of channels, e.g., additive white Gaussian noise (AWGN) and Rayleigh fading channels.
摘要翻译：无线系统可以发送表示相同信息的多个比特流，但是以不同的重复传输因子传输编码比特。接收机可以导出适当的组合度量以优化解码器性能，同时消除复杂的乘法运算。接收机可以利用不同的比特到符号映射和信道类型的不同的软组合度量，例如加性白高斯噪声（AWGN）和瑞利衰落信道。

92. 发明授权

US08045450B1 Transmit diversity technique based on channel randomization for OFDM systems 有权
标题翻译：基于OFDM系统的信道随机化的发射分集技术
公开(公告)号：US08045450B1
公开(公告)日：2011-10-25
申请号：US12643169
申请日：2009-12-21
申请人： Jungwon Lee , Hui-Ling Lou
发明人： Jungwon Lee , Hui-Ling Lou
IPC分类号： H04J11/00
CPC分类号： H04J11/0063 , H04B7/0413 , H04B7/0456 , H04B7/0615 , H04B7/0885 , H04L1/0606 , H04L27/2626 , H04L27/2647
摘要： A physical layer module includes a mapping module and a plurality of gain modules. The mapping module maps a plurality of coded data streams to a plurality of transmit antennas, in which each transmit antenna is associated with a respective radio frequency channel of a plurality of radio frequency channels. Each gain module is associated with a respective radio frequency channel of the plurality of radio frequency channels, and is configured to apply a complex gain to the coded data stream mapped to the respective radio frequency channel associated with the gain module. The complex gain applied by the gain module differs relative to that applied by other gain modules, and corresponds to the transmit antenna associated with the respective radio frequency channel.
摘要翻译：物理层模块包括映射模块和多个增益模块。映射模块将多个编码数据流映射到多个发射天线，其中每个发射天线与多个射频信道的相应射频信道相关联。每个增益模块与多个射频信道的相应射频信道相关联，并且被配置为对映射到与增益模块相关联的相应射频信道的编码数据流应用复增益。由增益模块应用的复合增益与其他增益模块所应用的复合增益不同，并且对应于与各个射频信道相关联的发射天线。

93. 发明授权

US08014472B1 Integer frequency offset estimation in wireless systems 有权
标题翻译：无线系统中的整数频偏估计
公开(公告)号：US08014472B1
公开(公告)日：2011-09-06
申请号：US12393017
申请日：2009-02-25
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： H03D1/00
CPC分类号： H04L27/2675 , H04L27/2659 , H04L27/2679
摘要： Systems and techniques relating to wireless communications are described. A described technique includes receiving a plurality of symbols, observing a plurality of data samples in adjacent symbols, and calculating an estimate of an integer portion of a carrier frequency offset based on a cyclic shift and a phase shift of the data samples between symbols. Calculating the estimate can include calculating sum values corresponding to respective symbol indices. Each of the sum values can be based on a summation of max values that correspond to respective data subcarrier indices, the max values being based on a maximum of an absolute value of a real component of a base value and an absolute value of an imaginary component of the base value, where the base value is based on at least one of the data samples.
摘要翻译：描述与无线通信相关的系统和技术。所描述的技术包括接收多个符号，观察相邻符号中的多个数据样本，并且基于符号之间的数据采样的循环移位和相移来计算载波频率偏移的整数部分的估计。计算估计可以包括计算对应于各个符号索引的和值。每个和值可以基于对应于各个数据子载波索引的最大值的总和，最大值基于基本值的实数分量的绝对值的最大值和虚部的绝对值的基值，其中基值基于至少一个数据样本。

94. 发明授权

US08009768B1 Integer frequency offset estimation based on the maximum likelihood principal in OFDM systems 有权
标题翻译：基于OFDM系统中最大似然法的整数频偏估计
公开(公告)号：US08009768B1
公开(公告)日：2011-08-30
申请号：US11836768
申请日：2007-08-09
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
CPC分类号： H04L27/2675 , H04L27/2659 , H04L27/2679
摘要： An apparatus includes an estimator that includes a receiver that receives a plurality of frequency-domain symbols. Each symbol includes at least one of a plurality of pilot samples and a plurality of data samples. The estimator also includes a framer that observes the at least one of the plurality of pilot samples and the plurality of data samples in adjacent symbols, and a calculator that calculates an integer carrier frequency offset (CFO) estimate based on a reliability metric based on the at least one of the plurality of pilot samples and the plurality of data samples that are included in the frequency-domain symbols.
摘要翻译：一种装置包括估计器，其包括接收多个频域符号的接收机。每个符号包括多个导频样本和多个数据样本中的至少一个。估计器还包括观察多个导频样本中的至少一个导频样本和相邻符号中的多个数据采样的成帧器，以及基于基于可靠性度量的整数载波频率偏移（CFO）估计的计算器所述多个导频样本和所述多个数据样本中的至少一个被包括在所述频域符号中。

95. 发明授权

US07778336B1 Timing and frequency synchronization of OFDM signals for changing channel conditions 有权
标题翻译：用于改变信道条件的OFDM信号的定时和频率同步
公开(公告)号：US07778336B1
公开(公告)日：2010-08-17
申请号：US11199840
申请日：2005-08-09
申请人： Dimitrios-Alexandros Toumpakaris , Jungwon Lee , Hui-Ling Lou
发明人： Dimitrios-Alexandros Toumpakaris , Jungwon Lee , Hui-Ling Lou
IPC分类号： H04K1/10
CPC分类号： H04L27/2659 , H04L27/266 , H04L27/2665
摘要： An Orthogonal Frequency Division Multiplexing (OFDM) synchronization module includes a window generator module, a symbol timing estimator module, and a reliability metric calculator. The window generator module generates a sampling window that bounds a plurality of samples of OFDM symbols. The symbol timing estimator module generates an estimated symbol timing from the plurality of samples before a fast Fourier transform operation is performed on the plurality of samples. The reliability metric calculator calculates a reliability metric for the estimated symbol timing based on the estimated symbol timing. The window generator module changes at least one parameter of the sampling window based on the reliability metric.
摘要翻译：正交频分复用（OFDM）同步模块包括窗口发生器模块，符号定时估计器模块和可靠性度量计算器。窗口生成器模块生成限定OFDM符号的多个采样的采样窗口。符号定时估计器模块在对多个样本执行快速傅里叶变换操作之前，从多个样本生成估计符号定时。可靠性度量计算器基于估计的符号定时计算估计的符号定时的可靠性度量。窗口生成器模块基于可靠性度量改变采样窗口的至少一个参数。

96. 发明申请

US20090262855A1 DATA SYMBOL MAPPING FOR MULTIPLE-INPUT MULTIPLE-OUTPUT HYBRID AUTOMATIC REPEAT REQUEST 有权
标题翻译：用于多输入多输出混合自动重复请求的数据符号映射
公开(公告)号：US20090262855A1
公开(公告)日：2009-10-22
申请号：US12410044
申请日：2009-03-24
申请人： Jungwon Lee , Bhaskar V. Nallapureddy , Hui-Ling Lou
发明人： Jungwon Lee , Bhaskar V. Nallapureddy , Hui-Ling Lou
IPC分类号： H04B7/02 , H04L27/00 , H04L27/28
CPC分类号： H04L1/0009 , H04B7/0669 , H04B7/0689 , H04B7/0697 , H04L1/0625 , H04L1/0668 , H04L1/1816 , H04L1/1845
摘要： A system includes an encoding module, a symbol selection module, a subcarrier selection module, and a mapping module. The encoding module receives symbols for transmission over K subcarriers and T antennas, encodes the symbols using a space time code, and generates space time coded (STC) versions of the symbols, where K and T are integers greater than 1. The symbol selection module selects T adjacent ones of the symbols and selects STC versions of the T adjacent ones of the symbols. The subcarrier selection module selects one of the K subcarriers for transmitting the T adjacent ones of the symbols and the STC versions of the T adjacent ones of the symbols. The mapping module maps the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers, respectively, and maps the STC versions of the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers.
摘要翻译：系统包括编码模块，符号选择模块，子载波选择模块和映射模块。编码模块接收用于通过K个子载波和T个天线进行传输的符号，并使用空时码对该符号进行编码，并生成符号的空时编码（STC）版本，其中K和T是大于1的整数。符号选择模块选择T个相邻的符号，并选择T个相邻符号的STC版本。子载波选择模块选择用于发送T个相邻符号的T个子载波之一和T个相邻符号的STC版本。映射模块将T个相邻的符号映射到T个天线上，以便在所选的K个子载波之间分别传输，并将T个相邻的符号的STC版本映射到T个天线上，以便通过所选择的 K个子载波之一。

97. 发明授权

US07529179B1 Joint maximum likelihood estimation of integer carrier frequency offset and channel in OFDM systems 有权
标题翻译： OFDM系统中整数载波频偏和信道的联合最大似然估计
公开(公告)号：US07529179B1
公开(公告)日：2009-05-05
申请号：US11218809
申请日：2005-09-02
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： H04J11/00
CPC分类号： H04L27/2675 , H04L25/0228 , H04L27/2659
摘要： An Orthogonal Frequency Division Multiplexing (OFDM) receiver is provided that receives a modulated OFDM signal through a channel. The OFDM receiver includes an RF downconverter that generates a downconverted modulated OFDM signal based on the modulated OFDM signal, an analog-to-digital converter (ADC) that generates digitized OFDM symbols based on the downconverted modulated OFDM signal, a carrier-phase correction module that generates time-domain symbols based on the digitized OFDM symbols, a fast Fourier transform (FFT) module that generates frequency-domain symbols based on the time-domain symbols, and an estimator module that receives the frequency-domain symbols and determines an integer carrier frequency offset (CFO) estimate and a channel estimate and that generates respective integer CFO estimate and channel estimate signals.
摘要翻译：提供了一种通过信道接收经调制的OFDM信号的正交频分复用（OFDM）接收机。 OFDM接收机包括：RF下变频器，其基于经调制的OFDM信号产生下变频调制OFDM信号;基于下变频调制OFDM信号生成数字化OFDM符号的模数转换器（ADC）;载波相位校正模块基于所述数字化OFDM符号生成时域符号，基于所述时域符号生成频域符号的快速傅立叶变换（FFT）模块以及接收所述频域符号并确定整数的估计器模块载波频率偏移（CFO）估计和信道估计，并且其产生相应的整数CFO估计和信道估计信号。

98. 发明授权

US07505523B1 Integer frequency offset estimation based on the maximum likelihood principal in OFDM systems 有权
标题翻译：基于OFDM系统中最大似然法的整数频偏估计
公开(公告)号：US07505523B1
公开(公告)日：2009-03-17
申请号：US11031614
申请日：2005-01-07
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： H04K1/10
CPC分类号： H04L27/2675 , H04L27/2659 , H04L27/2679
摘要： A receiver in an OFDM system may include a maximum likelihood (ML) estimator that estimates the integer part of the carrier frequency offset. The estimator may operate with or without pilot subcarriers. The estimator may calculate the integer frequency offset estimate based on the cyclic shift and phase shift of subcarriers between OFDM symbols.
摘要翻译： OFDM系统中的接收机可以包括估计载波频率偏移的整数部分的最大似然（ML）估计器。估计器可以在有或没有导频子载波的情况下操作。估计器可以基于OFDM符号之间的子载波的循环移位和相移来计算整数频率偏移估计。

99. 发明授权

US07421013B1 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：US07421013B1
公开(公告)日：2008-09-02
申请号：US11026543
申请日：2004-12-30
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。

100. 发明申请

US20080037670A1 MAXIMAL RATIO COMBINING OF EQUALIZED SYMBOLS FOR MIMO SYSTEMS WITH HARQ AND/OR REPETITION CODING 有权
标题翻译：用于具有HARQ和/或重复编码的MIMO系统的均衡符号的最大比率组合
公开(公告)号：US20080037670A1
公开(公告)日：2008-02-14
申请号：US11834599
申请日：2007-08-06
申请人： Jungwon Lee , Woong Jun Jang , Hui-Ling Lou
发明人： Jungwon Lee , Woong Jun Jang , Hui-Ling Lou
IPC分类号： H04K1/10
CPC分类号： H04L27/01 , H04B7/0413 , H04B7/0697 , H04B7/0845 , H04B7/0857 , H04L1/08 , H04L1/1816 , H04L1/1845 , H04L2025/03426
摘要： Systems and methods are provided for decoding signal vectors in multiple-input multiple-output (MIMO) systems, where the receiver has received one or more signal vectors based on the same transmitted vector. The receiver linearizes each received signal vector using one or more zero-forcing, MMSE, or other suitable linear equalizers. The components of the equalized signal vectors may be combined using maximum-ratio combining to form the components of a combined equalized signal vector. The components of the combined equalized signal vector may then be decoded individually using a linear decoder.
摘要翻译：提供了用于对多输入多输出（MIMO）系统中的信号向量进行解码的系统和方法，其中接收机已经基于相同的传输向量接收了一个或多个信号向量。接收机使用一个或多个零强制，MMSE或其他合适的线性均衡器来线性化每个接收信号向量。可以使用最大比合并来组合均衡的信号向量的分量以形成组合的均衡信号向量的分量。然后可以使用线性解码器单独地解码组合的均衡信号向量的分量。

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