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91. 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.

92. 发明授权

US08565360B1 Dimension reduction for codebook search 有权
公开(公告)号：US08565360B1
公开(公告)日：2013-10-22
申请号：US13399553
申请日：2012-02-17
申请人： Yakun Sun , Jungwon Lee
发明人： Yakun Sun , Jungwon Lee
IPC分类号： H04L1/02
CPC分类号： H04B7/0456 , H04L1/20 , H04L5/0023 , H04L25/03343 , H04L2025/03426 , H04L2025/03808
摘要： Systems are provided for searching for a codeword from a plurality of codewords in a codebook for use in precoding, for example, as used in a multiple-input multiple-output (MIMO) transmission system. Dimension reduction techniques may be utilized to reduce the complexity and enhance the efficiency of the codebooks search. Null-spaces of an optimal codeword and codewords in a codebook may be computed. Distance values may be computed based on the null=spaces of the codewords. A codeword may be selected from the codebook based on a minimum distance value from the optimal codeword.

93. 发明授权

US08559543B1 Soft sphere decoder for MIMO maximum likelihood demodulation 有权
公开(公告)号：US08559543B1
公开(公告)日：2013-10-15
申请号：US12891377
申请日：2010-09-27
申请人： Jungwon Lee , Jiwoong Choi
发明人： Jungwon Lee , Jiwoong Choi
IPC分类号： H04L1/02
CPC分类号： H04B7/0413 , H04L25/03242
摘要： Methods and apparatus are provided for soft-decision maximum likelihood demodulation to decode a data vector transmitted in a multiple-input multiple-output (MIMO) communications channel. Soft-decision demodulators are disclosed that implement sphere decoding to reduce complexity of demodulation while preserving optimal performance. Candidate signal values associated with the transmitted data vector may be obtained and partitioned into signal bit groups. A sphere search may be performed over the candidate signal values within a search radius value to determine a smallest distance metric for each signal bit group. The search radius value may be updated based on a current smallest distance metric for each signal bit group. A log-likelihood ratio (LLR) may be computed from the determined smallest distance metrics for each signal bit group using a soft-decision demodulator.

94. 发明申请

US20130156139A1 WIRELESS COMMUNICATION SYSTEM WITH INTERFERENCE FILTERING AND METHOD OF OPERATION THEREOF 审中-公开
标题翻译：具有干扰滤波的无线通信系统及其操作方法
公开(公告)号：US20130156139A1
公开(公告)日：2013-06-20
申请号：US13560330
申请日：2012-07-27
申请人： Jungwon Lee , Hyukjoon Kwon , Inyup Kang
发明人： Jungwon Lee , Hyukjoon Kwon , Inyup Kang
IPC分类号： H04B1/10
CPC分类号： H04W28/18 , H04L1/0048 , H04L1/005 , H04L1/0054
摘要： A method of operation of a wireless communication system includes: receiving a desired input signal and an interference input signal; activating a first symbol detector for generating a desired log-likelihood ratio from the desired input signal; activating a second symbol detector for generating an interference log-likelihood ratio from the interference input signal; and jointly decoding a decoded bit by iteratively refining the interference log-likelihood ratio for negating the interference input signal and iteratively refining the desired log-likelihood ratio for enhancing the desired input signal.
摘要翻译：无线通信系统的操作方法包括：接收期望的输入信号和干扰输入信号; 激活第一符号检测器，用于从期望的输入信号产生所需的对数似然比; 激活第二符号检测器，用于从所述干扰输入信号产生干扰对数似然比; 并且通过迭代地改善干扰对数似然比来否定干扰输入信号并迭代地提炼期望的对数似然比以增强期望的输入信号来联合解码解码比特。

95. 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。

96. 发明授权

US08379508B1 Systems and methods for computing a relative path delay between multiple transmission sources 有权
标题翻译：用于计算多个传输源之间的相对路径延迟的系统和方法
公开(公告)号：US08379508B1
公开(公告)日：2013-02-19
申请号：US12835904
申请日：2010-07-14
申请人： Jungwon Lee , Jiwoong Choi , Jihwan P. Choi
发明人： Jungwon Lee , Jiwoong Choi , Jihwan P. Choi
IPC分类号： H04J11/00 , H04J3/06
CPC分类号： H04W40/38 , H04J11/0063 , H04L25/0202 , H04L27/2601
摘要： Systems and methods are provided for computing a relative path delay between multiple transmitting source to select a source that is closest to a receiving device. Preamble sequences unique to each source are received by a receiving device. The receiving devices determines based on a channel estimation or differential algorithm which transmitting source is closer to the receiving device. The channel estimation algorithm computes the path delay based on a channel estimation correlation at different preamble sequence indices. The differential algorithm computes the path delay based on a correlation between the received and transmitted preamble sequences at different preamble sequence indices. The receiving device selects the closer of the multiple sources to be the source from which to extract data.
摘要翻译：提供的系统和方法用于计算多个发送源之间的相对路径延迟，以选择最接近接收设备的源。每个源独有的前导序列由接收设备接收。接收装置基于信道估计或差分算法确定发射源更靠近接收装置。信道估计算法基于在不同前同步码序列索引处的信道估计相关性来计算路径延迟。差分算法基于在不同前同步码序列索引处的接收和发送前同步码序列之间的相关性来计算路径延迟。接收设备选择要从中提取数据的源的更多的源。

97. 发明申请

US20130039447A1 SYMBOL VECTOR-LEVEL COMBINING RECEIVER FOR INCREMENTAL REDUNDANCY HARQ WITH MIMO 有权
标题翻译：带有MIMO的增量冗余HARQ的符号矢量级组合接收机
公开(公告)号：US20130039447A1
公开(公告)日：2013-02-14
申请号：US13605099
申请日：2012-09-06
申请人： Jungwon Lee , Yakun Sun , Hui-Ling Lou
发明人： Jungwon Lee , Yakun Sun , Hui-Ling Lou
IPC分类号： H04L27/06
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. 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。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。

98. 发明授权

US08340231B1 Optimal symbol detection in the presence of non-gaussian interference 有权
标题翻译：存在非高斯干扰的最佳符号检测
公开(公告)号：US08340231B1
公开(公告)日：2012-12-25
申请号：US12823898
申请日：2010-06-25
申请人： Jungwon Lee
发明人： Jungwon Lee
IPC分类号： H03D1/04 , H03D1/06 , H03K5/01 , H03K6/04 , H04B1/10 , H04L1/00 , H04L25/08
CPC分类号： H04B1/10 , H04L25/061 , H04L25/4917 , H04L27/18 , H04L27/2647
摘要： Techniques are provided for detecting a coded signal in the presence of non-Gaussian interference. In an embodiment, a primary transmitter corresponds to a desired transmitter, and one or more secondary transmitters correspond to interfering transmitters. In an embodiment, received symbols, which include non-Gaussian interference and additive noise, are decoded to determine a set of message bits. In an embodiment, an estimate of the set of message bits may be determined using a minimum-distance detector or an optimal-ML detector, for example, depending on the signal-to-noise and/or signal-to-interference ratios at a receiver.
摘要翻译：提供了用于在存在非高斯干扰的情况下检测编码信号的技术。在一个实施例中，主发射机对应于期望的发射机，并且一个或多个次发射机对应于干扰发射机。在一个实施例中，包括非高斯干扰和加性噪声的接收符号被解码以确定一组消息比特。在一个实施例中，可以使用最小距离检测器或最优ML检测器来确定该组消息比特的估计，例如，取决于在一个或多个信号处理中的信噪比和/或信号干扰比接收器。

99. 发明授权

US08300716B1 Link adaptation for OFDM systems 有权
标题翻译： OFDM系统的链路适配
公开(公告)号：US08300716B1
公开(公告)日：2012-10-30
申请号：US12328443
申请日：2008-12-04
申请人： Jungwon Lee , Jihwan P. Choi , Hui-Ling Lou
发明人： Jungwon Lee , Jihwan P. Choi , Hui-Ling Lou
IPC分类号： H04L27/28
CPC分类号： H04L1/0019 , H04L1/0003 , H04L1/0009 , H04L1/203 , H04L5/0007 , H04L5/0046 , H04W24/08
摘要： A method of adaptively selecting a modulation and coding scheme (MCS) of a communication link includes obtaining a first parameter corresponding to a Quality of Service (QoS) requirement of the communication link, obtaining a second parameter indicative of a physical condition of the communication link, selecting an MCS based on at least the first parameter and the second parameter.
摘要翻译：自适应地选择通信链路的调制和编码方案（MCS）的方法包括：获得与通信链路的服务质量（QoS）要求对应的第一参数，获得指示通信链路的物理状况的第二参数至少基于第一参数和第二参数选择MCS。

100. 发明申请

US20120257692A1 RECEIVER SYSTEM AND METHOD OF OPERATION THEREOF 有权
标题翻译：接收机系统及其操作方法
公开(公告)号：US20120257692A1
公开(公告)日：2012-10-11
申请号：US13441896
申请日：2012-04-08
申请人： Chun Kim Au Yeung , Sungsoo Kim , Jungwon Lee
发明人： Chun Kim Au Yeung , Sungsoo Kim , Jungwon Lee
IPC分类号： H04L27/06 , H04B1/10
CPC分类号： H04L25/061 , H04L1/0045 , H04L1/006 , H04L5/0023 , H04L25/067 , H04L27/22 , H04L27/36
摘要： A method of operation of a communication system includes: utilizing an estimation module estimating a log-likelihood ratio for a transmission; and utilizing a slicing module, coupled to the estimation module, slicing a constellation by: reading the log-likelihood ratio from the estimation module, defining a threshold within the constellation, and adjusting the threshold based on the log-likelihood ratio for determining a symbol.
摘要翻译：一种通信系统的操作方法包括：利用估计传输的对数似然比估计模块; 并且利用耦合到所述估计模块的限幅模块，通过以下方式对所述星座进行切片：通过从所述估计模块读取所述对数似然比来定义所述星座图内的阈值，以及基于所述对数似然比来调整所述阈值以确定符号。

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