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81. 发明授权

US08761302B1 Method and apparatus for implementing transmit diversity in OFDM systems 有权
标题翻译：在OFDM系统中实现发射分集的方法和装置
公开(公告)号：US08761302B1
公开(公告)日：2014-06-24
申请号：US13902961
申请日：2013-05-27
申请人： Jungwon Lee , Jihwan P. Choi , Hui-Ling Lou , Rohit U. Nabar , Yakun Sun
发明人： Jungwon Lee , Jihwan P. Choi , Hui-Ling Lou , Rohit U. Nabar , Yakun Sun
IPC分类号： H04L27/00
CPC分类号： H04L27/2627 , H04B7/0413 , H04B7/0669 , H04B7/0671 , H04L1/0625 , H04L5/0023 , H04L5/0087 , H04L25/0204 , H04L25/03159 , H04L2025/03414 , H04L2025/03426
摘要： A plurality of diagonal matrices Ci is determined, where the plurality of diagonal matrices Ci is for modifying a plurality of transmit signals to be transmitted via a plurality of transmit antennas, each diagonal matrix Ci for modifying an i-th block of sub-carriers, adjacent in frequency, in the plurality of transmit signals. The plurality of diagonal matrices Ci is used to modify the plurality of transmit signals to implement transmit diversity.
摘要翻译：确定多个对角矩阵Ci，其中多个对角矩阵Ci用于修改要经由多个发射天线发射的多个发射信号，用于修改第i个子载波块的每个对角矩阵Ci，频率相邻的多个发送信号。多个对角矩阵Ci用于修改多个发射信号以实现发射分集。

82. 发明授权

US08699644B1 Adaptive low-complexity channel estimation 有权
标题翻译：自适应低复杂度信道估计
公开(公告)号：US08699644B1
公开(公告)日：2014-04-15
申请号：US13282952
申请日：2011-10-27
申请人： Yakun Sun , Jiwoong Choi , Hui-Ling Lou , Rapheal Cendrillon
发明人： Yakun Sun , Jiwoong Choi , Hui-Ling Lou , Rapheal Cendrillon
IPC分类号： H04B1/10
CPC分类号： H04L25/0206 , H04L25/0204 , H04L25/0212 , H04L25/022 , H04L25/0228 , H04L27/2647 , H04L27/2649 , H04L27/38 , H04L2025/03535
摘要： Systems, methods, and other embodiments associated with adaptive low-complexity channel estimation are illustrated. In one embodiment a device includes a receiver configured to receive an orthogonal frequency-division multiplexed (OFDM) signal. The device also includes a controller configured to control a switch to select between processing paths based, at least in part, on the channel conditions of the OFDM signal. The processing paths selectable by the switch include a first processing path and a second processing path.
摘要翻译：示出了与自适应低复杂度信道估计相关联的系统，方法和其他实施例。在一个实施例中，设备包括被配置为接收正交频分复用（OFDM）信号的接收机。该设备还包括控制器，其被配置为至少部分地基于OFDM信号的信道条件来控制交换机在处理路径之间进行选择。由开关可选择的处理路径包括第一处理路径和第二处理路径。

83. 发明授权

US08681888B1 Link adaptation for OFDM systems 有权
标题翻译： OFDM系统的链路适配
公开(公告)号：US08681888B1
公开(公告)日：2014-03-25
申请号：US13619523
申请日：2012-09-14
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 includes determining one or more metrics indicative of at least one of (i) interference on a communication link, (ii) noise on the communication link, and (iii) performance of a receiver receiving packets via the communication link, selecting a modulation and coding scheme as a function of (i) the determined one or more metrics, and (ii) one or more Quality of Service requirements for the communication link, and correcting the selected modulation and coding scheme using a current value of a correction factor. The corrected modulation and coding scheme is to be used to generate one or more packets. The method also includes determining an error rate corresponding to packets previously transmitted over the communication link, and adjusting the correction factor based on the determined error rate. Adjusting the correction factor includes incrementing or decrementing the correction factor.
摘要翻译：一种方法包括确定一个或多个度量，其指示以下中的至少一个：（i）通信链路上的干扰，（ii）通信链路上的噪声，以及（iii）经由通信链路接收分组的接收机的性能，选择调制以及作为（i）确定的一个或多个度量的函数的编码方案，以及（ii）通信链路的一个或多个服务质量要求，以及使用校正因子的当前值来校正所选择的调制和编码方案。校正的调制和编码方案将用于生成一个或多个分组。该方法还包括确定对应于先前通过通信链路发送的分组的错误率，以及基于所确定的错误率来调整校正因子。调整校正因子包括增加或减少校正因子。

84. 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）。

85. 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。

86. 发明授权

US08477813B2 Physical layer data unit format 有权
标题翻译：物理层数据单元格式
公开(公告)号：US08477813B2
公开(公告)日：2013-07-02
申请号：US12548205
申请日：2009-08-26
申请人： Hongyuan Zhang , Rohit U. Nabar , Manyuan Shen , Songping Wu , Hui-Ling Lou , Yong Liu
发明人： Hongyuan Zhang , Rohit U. Nabar , Manyuan Shen , Songping Wu , Hui-Ling Lou , Yong Liu
IPC分类号： H04J3/06
CPC分类号： H04W16/28 , H04L25/03343 , H04L27/2613 , H04L2025/03426 , H04L2025/03789 , H04L2025/03815
摘要： In a wireless communication system wherein communication devices exchange information utilizing data units that conform to a first format, a beamforming training (BFT) data unit that conforms to a second format is transmitted, wherein a length of the BFT data unit is shorter than lengths supported by the first format, wherein the BFT data unit is for transmitting PHY beamforming training information. Information to indicate the BFT data unit conforms to the second format is transmitted to a receiving device. The BFT data unit is generated according to the second format, wherein the BFT data unit includes BFT information elements. The BFT data unit is then transmitted to the receiving device.
摘要翻译：在其中通信设备利用符合第一格式的数据单元交换信息的无线通信系统中，发送符合第二格式的波束形成训练（BFT）数据单元，其中所述BFT数据单元的长度短于所支持的长度通过第一格式，其中BFT数据单元用于发送PHY波束形成训练信息。用于指示符合第二格式的BFT数据单元的信息被发送到接收设备。 BFT数据单元根据第二格式生成，其中BFT数据单元包括BFT信息元素。然后将BFT数据单元发送到接收设备。

87. 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.

88. 发明授权

US08369469B1 Robust synchronization and detection mechanisms for OFDM WLAN systems 有权
标题翻译： OFDM WLAN系统的鲁棒同步和检测机制
公开(公告)号：US08369469B1
公开(公告)日：2013-02-05
申请号：US13085350
申请日：2011-04-12
申请人： Atul Salhotra , Kedar Shirali , Zhiyu Yang , Hui-Ling Lou
发明人： Atul Salhotra , Kedar Shirali , Zhiyu Yang , Hui-Ling Lou
IPC分类号： H04L25/08
CPC分类号： H04B7/0857 , H04B7/084 , H04L2025/03414 , H04L2025/03426
摘要： A method including: receiving, through a wireless channel, a plurality of modulated signals at a plurality of antennas, wherein each antenna receives a corresponding modulated signal; generating a plurality of autocorrelated signals by autocorrelating the plurality of modulated signals; determining whether a signal strength associated with each modulated signal is (i) below a threshold or (ii) above the threshold; for each modulated signal having a signal strength below the threshold, disabling the antenna that received the modulated signal having the signal strength below the threshold; combining the modulated signals having a signal strength above the threshold; generating weighted autocorrelated signals based on (i) the plurality of autocorrelated signals and (ii) the combined modulated signals; generating a combined weighted signal by summing the weighted autocorrelation signals; demodulating the combined weighted signal; and determining a state of the wireless channel based on the demodulation of the combined weighted signal.
摘要翻译：一种方法，包括：通过无线信道在多个天线处接收多个调制信号，其中每个天线接收对应的调制信号; 通过对所述多个调制信号进行自相关来生成多个自相关信号; 确定与每个调制信号相关联的信号强度是否是（i）低于阈值或（ii）高于阈值; 对于具有低于阈值的信号强度的每个调制信号，禁用接收到信号强度低于阈值的调制信号的天线; 组合具有高于阈值的信号强度的调制信号; 基于（i）所述多个自相关信号和（ii）所述组合调制信号产生加权自相关信号; 通过对加权的自相关信号求和来产生组合的加权信号; 解调组合加权信号; 以及基于所述组合加权信号的解调来确定所述无线信道的状态。

89. 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）。

90. 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。

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