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51. 发明授权

US08654902B2 BICM decoding in the presence of co-channel interference 有权
标题翻译：在存在同频道干扰的情况下进行BICM解码
公开(公告)号：US08654902B2
公开(公告)日：2014-02-18
申请号：US13402381
申请日：2012-02-22
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： H04L27/06
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）。

52. 发明授权

US08625694B1 Signal processing for independently produced signals 失效
标题翻译：用于独立产生信号的信号处理
公开(公告)号：US08625694B1
公开(公告)日：2014-01-07
申请号：US12938718
申请日：2010-11-03
申请人： Jungwon Lee , Jihwan P. Choi
发明人： Jungwon Lee , Jihwan P. Choi
IPC分类号： H04B7/02 , H04L1/02
CPC分类号： H04L27/3405 , H04L1/0048 , H04L1/0054 , H04L27/38
摘要： Systems and techniques relating to wireless communications are described. A described technique includes receiving a signal that represents concurrent wireless data communications, where the signal is based on superimposed signals modulated using different respective constellations; detecting a first signal from the received signal over a first combined constellation, the combined constellation being based on the respective constellations; modifying the received signal based on the first detected signal to remove a signal contribution associated with the first detected signal; and detecting a second signal from the modified received signal over a second constellation. The second constellation can be based on the respective constellations absent a constellation of the respective constellations that is associated with the first detected signal.
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表示并发无线数据通信的信号，其中信号基于使用不同的相应星座调制的叠加信号; 通过第一组合星座从接收到的信号中检测第一信号，所述组合星座基于相应的星座; 基于所述第一检测信号修改接收信号以去除与所述第一检测信号相关联的信号贡献; 以及通过第二星座从所述修改的接收信号中检测第二信号。第二星座可以基于不存在与第一检测信号相关联的相应星座的星座的相应星座。

53. 发明授权

US08595578B1 Significance of retransmission used in subsequent decoding 有权
标题翻译：在后续解码中使用重传的意义
公开(公告)号：US08595578B1
公开(公告)日：2013-11-26
申请号：US12940784
申请日：2010-11-05
申请人： Jungwon Lee , Jiwoong Choi
发明人： Jungwon Lee , Jiwoong Choi
IPC分类号： H04L1/18
CPC分类号： H04L1/1845 , G06F11/1004 , H04L1/1816 , H04L1/1819
摘要： Systems and techniques relating to wireless communications are described. A described technique includes receiving signals representing wireless data transmissions that are based on a symbol, the received signals including one or more first signals and a second signal, where a decoded version of the one or more first signals previously failed to successfully resolve the symbol. The second signal can be transmitted in response to the one or more first signals failing to successfully resolve the symbol. The technique includes determining the symbol based on the received signals, where the determining places more significance to the second signal than the one or more first signals.
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表示基于符号的无线数据传输的信号，所接收的信号包括一个或多个第一信号和第二信号，其中一个或多个第一信号的解码版本先前未成功地解析该符号。可以响应于一个或多个第一信号不能成功解析符号而发送第二信号。该技术包括基于接收到的信号确定符号，其中确定比第一信号比第二信号更有意义。

54. 发明授权

US08488698B1 Frame synchronization method and apparatus 有权
标题翻译：帧同步方法和装置
公开(公告)号：US08488698B1
公开(公告)日：2013-07-16
申请号：US13194093
申请日：2011-07-29
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。

55. 发明授权

US08428161B2 Symbol vector mapping for chase-combining HARQ 有权
标题翻译：用于追踪合并HARQ的符号向量映射
公开(公告)号：US08428161B2
公开(公告)日：2013-04-23
申请号：US12488240
申请日：2009-06-19
申请人： Yakun Sun , Jungwon Lee
发明人： Yakun Sun , Jungwon Lee
IPC分类号： H04K1/00
CPC分类号： H04L1/1812 , H04B7/0413 , H04B7/0669 , H04L1/0001 , H04L1/0618 , H04L1/0625 , H04L1/1816 , H04L1/1822 , H04L1/1825 , H04L1/189 , H04L1/1893 , H04L1/1896 , H04L27/2601 , H04L27/2602 , H04L27/2608
摘要： A method of transmitting data from a transmitter to a receiver includes transmitting a first data unit to the receiver via a plurality of antennas, the first data unit including a payload that has a plurality of symbols; determining whether the receiver has successfully received the first data unit; and, in response to determining that the receiver has not successfully received the first data unit, transmitting a second data unit to the receiver, the second data unit including the payload, such that transmitting the second data unit includes transmitting the plurality of symbols via at least one of different antennas and different subcarriers with respect to the first data unit.
摘要翻译：从发射机向接收机发送数据的方法包括经由多个天线向接收机发送第一数据单元，第一数据单元包括具有多个符号的有效载荷; 确定接收机是否已成功接收到第一数据单元; 并且响应于确定所述接收机尚未成功接收到所述第一数据单元，向所述接收机发送第二数据单元，所述第二数据单元包括所述有效负载，使得发送所述第二数据单元包括经由所述第二数据单元至少一个不同的天线和相对于第一数据单元的不同子载波。

56. 发明授权

US08411806B1 Method and apparatus for receiving signals in a MIMO system with multiple channel encoders 有权
公开(公告)号：US08411806B1
公开(公告)日：2013-04-02
申请号：US12543363
申请日：2009-08-18
申请人： Jungwon Lee , Hui-Ling Lou
发明人： Jungwon Lee , Hui-Ling Lou
IPC分类号： H04L27/06
CPC分类号： H04B7/0413 , H04L1/005 , H04L1/0055 , H04L1/0631 , H04L25/03305 , H04L25/03318 , H04L25/03891
摘要： In a method for decoding plurality of information streams corresponding to a plurality of layers, where the plurality of information streams have been transmitted via a multiple input multiple output (MIMO) communication channel, a plurality of received signals are processed to decode information corresponding to a first layer. A plurality of modified received signals are generated using the decoded information corresponding to the first layer and the plurality of received signals. Bit metric values are generated for a second layer using MIMO maximum likelihood (ML) demodulation and using the plurality of modified received signals and channel and modulation information for interfering signals. Information corresponding to the second layer is decoded using the generated bit metric values.

57. 发明授权

US08379745B1 Forward channel variation detection in a wireless communication system 有权
标题翻译：无线通信系统中的前向信道变化检测
公开(公告)号：US08379745B1
公开(公告)日：2013-02-19
申请号：US12168595
申请日：2008-07-07
申请人： Rohit U. Nabar , Hongyuan Zhang , Jungwon Lee
发明人： Rohit U. Nabar , Hongyuan Zhang , Jungwon Lee
IPC分类号： H04B7/02
CPC分类号： H04B7/0456 , H04B7/0617 , H04B7/0619 , H04L1/0003 , H04L1/0009 , H04L25/0222 , H04L25/0228
摘要： A method and apparatus for detecting variations in the forward wireless channel in a wireless communication system. A plurality of reverse channel estimates in a reverse wireless channel are monitored, and a rate of change is measured between the plurality of reverse channel estimates in the reverse wireless channel. A rate of change in the forward wireless channel is estimated from the rate of change between the plurality of reverse channel estimates in the reverse wireless channel. If the estimated rate of change in the forward wireless channel exceeds a threshold, an update of a steering matrix is initiated.
摘要翻译：一种用于检测无线通信系统中的前向无线信道中的变化的方法和装置。监视反向无线信道中的多个反向信道估计，并且在反向无线信道中的多个反向信道估计之间测量变化率。根据反向无线信道中的多个反向信道估计之间的变化率来估计前向无线信道的变化率。如果前向无线信道的估计速率变化超过阈值，则启动导引矩阵的更新。

58. 发明授权

US08311152B1 Adaptive OFDM receiver based on carrier frequency offset 有权
标题翻译：基于载波频偏的自适应OFDM接收机
公开(公告)号：US08311152B1
公开(公告)日：2012-11-13
申请号：US10986110
申请日：2004-11-10
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： H03K9/00 , H04L27/22 , H04L23/00 , H04J11/00
CPC分类号： H04L27/2657 , H04B7/01
摘要： An adaptive receiver comprises a receiver module that receives an orthogonal frequency division multiplexing (OFDM) signal. An operating parameters module monitors at least one operating parameter of the receiver module and generates a select signal based the at least one operating parameter. An estimator module selects between first and second algorithms based on the select signal and selectively estimates a carrier frequency offset (CFO) of the OFDM signal using the one of the first and second algorithms. Alternately, an estimator module adjusts algorithm operating parameters of a first algorithm based on the select signal and selectively estimates a carrier frequency offset (CFO) of the OFDM signal using the selected algorithm operating parameters of the first algorithm.
摘要翻译：自适应接收机包括接收正交频分复用（OFDM）信号的接收机模块。操作参数模块监视接收机模块的至少一个操作参数，并基于该至少一个操作参数生成选择信号。估计器模块基于选择信号在第一和第二算法之间进行选择，并且使用第一和第二算法之一选择性地估计OFDM信号的载波频率偏移（CFO）。或者，估计器模块基于选择信号来调整第一算法的算法运行参数，并且使用所选择的算法运算参数选择性地估计OFDM信号的载波频率偏移（CFO）。

59. 发明授权

US08279980B1 Detector for single-user coded signals in the presence of interference 有权
标题翻译：在有干扰的情况下用于单用户编码信号的检测器
公开(公告)号：US08279980B1
公开(公告)日：2012-10-02
申请号：US12468631
申请日：2009-05-19
申请人： Jungwon Lee , Hui-Ling Lou
发明人： Jungwon Lee , Hui-Ling Lou
IPC分类号： H04L27/06
CPC分类号： H04L1/0036 , H04L25/03305 , H04L2025/03726
摘要： Techniques are provided for detecting a coded signal in the presence of interference. In an embodiment, a primary transmitter corresponds to a desired transmitter, and one or more secondary transmitters correspond to interfering transmitters. Received symbols, which include interference and additive noise, are filtered to recover a set of original message bits. An estimate of the set of original message bits may be determined using an ordered successive interference cancellation (SIC) decoder that uses either a SIC detector or an AWGN-based detector, depending on the signal-to-interference ratio at a primary receiver.
摘要翻译：提供了用于在存在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。接收到的包括干扰和加性噪声的符号被过滤以恢复一组原始消息位。可以使用使用SIC检测器或基于AWGN的检测器的有序连续干扰消除（SIC）解码器来确定原始消息比特组的估计，这取决于主接收机处的信号干扰比。

60. 发明授权

US08279966B2 Symbol-level combining for multiple input multiple output (MIMO) systems with hybrid automatic repeat request (HARQ) and/or repetition coding 有权
公开(公告)号：US08279966B2
公开(公告)日：2012-10-02
申请号：US13236410
申请日：2011-09-19
申请人： Jungwon Lee , Woong Jun Jang , Leilei Song
发明人： Jungwon Lee , Woong Jun Jang , Leilei Song
IPC分类号： H04B7/02
CPC分类号： H04B7/0842 , H04L1/1819 , H04L1/1845 , H04L1/189 , H04L25/0204
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 from the same transmitted vector. The symbols of the received signal vectors are combined, forming a combined received signal vector that may be treated as a single received signal vector. The combined signal vector is then decoded using a maximum-likelihood decoder. In some embodiments, the combined received signal vector may be processed prior to decoding. Systems and methods are also provided for computing soft information from a combined signal vector based on a decoding metric. Computationally intensive calculations can be extracted from the critical path and implemented in preprocessors and/or postprocessors.

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