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1. 发明授权

US08582692B1 Systems and methods for calibrating digital baseband DC offset in an OFDM receiver 有权
标题翻译：用于在OFDM接收机中校准数字基带DC偏移的系统和方法
公开(公告)号：US08582692B1
公开(公告)日：2013-11-12
申请号：US13613212
申请日：2012-09-13
申请人： Qing Zhao , Souvik Dihidar , Leilei Song , Jungwon Lee
发明人： Qing Zhao , Souvik Dihidar , Leilei Song , Jungwon Lee
IPC分类号： H04L25/06
CPC分类号： H04L27/2647 , H04L25/06
摘要： In accordance with the teachings described herein, systems and methods are provided for calibrating DC offset in a receiver. A DC calibration circuit may be used that is configured to remove DC offset from a digital multi-carrier modulated (MCM) signal that includes a sequence of MCM symbols. The DC calibration circuit may include an accumulator and a compensator. The accumulator may be used to determine an estimated DC offset of a current MCM symbol in the sequence of MCM symbols. The compensator may be used to remove the estimated DC offset from a next MCM symbol in the sequence of MCM symbols. The accumulator may also be used to receive a plurality of digital samples that comprise the current MCM symbol and to determine the estimated DC offset by calculating an average of the plurality of digital samples.
摘要翻译：根据本文所述的教导，提供了用于校准接收机中的DC偏移的系统和方法。可以使用DC校准电路，其被配置为从包括MCM符号序列的数字多载波调制（MCM）信号中去除DC偏移。 DC校准电路可以包括蓄电池和补偿器。可以使用累加器来确定MCM符号序列中的当前MCM符号的估计DC偏移。补偿器可以用于从MCM符号序列中的下一个MCM符号中去除估计的DC偏移。累加器还可以用于接收包括当前MCM符号的多个数字样本，并且通过计算多个数字样本的平均值来确定估计的DC偏移。

2. 发明授权

US08279955B1 Systems and methods for calibrating digital baseband DC offset in an OFDM receiver 有权
标题翻译：用于在OFDM接收机中校准数字基带DC偏移的系统和方法
公开(公告)号：US08279955B1
公开(公告)日：2012-10-02
申请号：US12353391
申请日：2009-01-14
申请人： Qing Zhao , Souvik Dihidar , Leilei Song , Jungwon Lee
发明人： Qing Zhao , Souvik Dihidar , Leilei Song , Jungwon Lee
IPC分类号： H04K1/10
CPC分类号： H04L27/2647 , H04L25/06
摘要： In accordance with the teachings described herein, systems and methods are provided for calibrating DC offset in a receiver. A DC calibration circuit may be used that is configured to receive a digital multi-carrier modulated (MCM) signal that includes a sequence of MCM symbols. The DC calibration circuit may include an accumulator and a compensator. The accumulator may be used to determine an estimated DC offset of a current MCM symbol in the sequence of MCM symbols. The compensator may be used to remove the estimated DC offset from a next MCM symbol in the sequence of MCM symbols. The accumulator may also be used to receive a plurality of digital samples that comprise the current MCM symbol and to determine the estimated DC offset by calculating an average of the plurality of digital samples.
摘要翻译：根据本文所述的教导，提供了用于校准接收机中的DC偏移的系统和方法。可以使用DC校准电路，其被配置为接收包括MCM符号序列的数字多载波调制（MCM）信号。 DC校准电路可以包括蓄电池和补偿器。可以使用累加器来确定MCM符号序列中的当前MCM符号的估计DC偏移。补偿器可以用于从MCM符号序列中的下一个MCM符号中去除估计的DC偏移。累加器还可以用于接收包括当前MCM符号的多个数字样本，并且通过计算多个数字样本的平均值来确定估计的DC偏移。

3. 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。

4. 发明授权

US08804691B1 Phase based preamble detection 有权
标题翻译：基于相位的前导码检测
公开(公告)号：US08804691B1
公开(公告)日：2014-08-12
申请号：US12540758
申请日：2009-08-13
申请人： Qing Zhao , Chuxiang Li , Leilei Song , Jungwon Lee
发明人： Qing Zhao , Chuxiang Li , Leilei Song , Jungwon Lee
IPC分类号： H04L27/26 , H04W56/00 , H04W88/02
CPC分类号： H04L27/2659 , H04L27/2613 , H04L27/2672 , H04L27/2675 , H04L27/2684 , H04W56/00 , H04W88/02
摘要： Devices, methods, and other embodiments associated with phase based preamble detection are described. In one embodiment, an apparatus includes a wireless transceiver, an evaluation logic, and a configuration logic. The wireless transceiver receives a wireless signal from a wireless device. The wireless signal includes a preamble sequence. The evaluation logic evaluates the preamble sequence by comparing phases of the preamble sequence to phases of predefined preamble sequences to identify a matching preamble sequence. The comparison is done without using amplitude information. The configuration logic configures the wireless transceiver to synchronize wireless communications with the wireless device based, at least in part, on the matching preamble sequence.
摘要翻译：描述了与基于相位的前导码检测相关联的设备，方法和其他实施例。在一个实施例中，一种装置包括无线收发器，评估逻辑和配置逻辑。无线收发器从无线设备接收无线信号。无线信号包括前序序列。评估逻辑通过将前导序列的相位与预定义的前导码序列的相位进行比较来评估前导序列，以识别匹配的前导码序列。比较不使用振幅信息。配置逻辑配置无线收发器以至少部分地基于匹配的前导码序列来与无线设备同步无线通信。

5. 发明授权

US07995666B1 Frame synchronization method and apparatus 有权
标题翻译：帧同步方法和装置
公开(公告)号：US07995666B1
公开(公告)日：2011-08-09
申请号：US12899928
申请日：2010-10-07
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。

6. 发明授权

US07813436B1 Frame synchronization method and apparatus 有权
标题翻译：帧同步方法和装置
公开(公告)号：US07813436B1
公开(公告)日：2010-10-12
申请号：US11851115
申请日：2007-09-06
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, a plurality of potential symbols are detected in a signal, the signal having been processed based on automatic gain control (AGC) with a varying gain. Next frame potential symbols corresponding to potential symbols in the plurality of potential symbols are determined, the next frame potential symbols being in frames subsequent to the frames in which the corresponding potential symbols are located. A gain of the AGC is fixed for each corresponding symbol interval during which a next frame potential symbol is operated on by the AGC. In between next frame potential symbols, the AGC is allowed to vary. Next frame potential symbols are analyzed after a transform is calculated to determine if any correspond to a start of a frame.
摘要翻译：在将接收机同步到同步信号的方法中，在信号中检测多个电位符号，该信号已经基于具有变化增益的自动增益控制（AGC）来处理。确定与多个电位符号中的电位符号相对应的下一帧电位符号，下一个电位符号位于相应电位符号位于的帧之后的帧中。对于每个对应的符号间隔，AGC的增益是固定的，在该间隔期间，由AGC操作下一个帧电位符号。在下一帧电势符号之间，允许AGC变化。在计算变换之后分析下一帧电位符号，以确定是否有对应于帧的开始。

7. 发明授权

US08019023B2 Low-complexity scalable architecture for concatenation-assisted symbol-level combining 有权
标题翻译：用于级联辅助符号级组合的低复杂性可扩展架构
公开(公告)号：US08019023B2
公开(公告)日：2011-09-13
申请号：US11839004
申请日：2007-08-15
申请人： Leilei Song , Jungwon Lee , Woong Jun Jang
发明人： Leilei Song , Jungwon Lee , Woong Jun Jang
IPC分类号： H04L27/06
CPC分类号： H04L25/03331 , H04L1/0047 , H04L1/08 , H04L1/1812 , H04L25/0204 , H04L25/0246 , H04L2025/0342 , H04L2025/03426
摘要： Systems and methods are provided for decoding signal vectors in multiple-input multiple-output (MIMO) systems, where a receiver has received one or more signal vectors from the same transmitted vector. The receiver processes these received signal vectors one by one, and uses information from signal vectors that have already been processed to process the next signal vector. To process a current signal vector, the receiver concatenates the current signal vector with a previously processed signal vector. This concatenated signal vector is decoded using, for example, a maximum-likelihood (ML). To decode the concatenated signal vector, the ML decoder can use a concatenated channel matrix that includes a channel response matrix associated with the current signal vector and a processed version of previous channel response matrices.
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，其中接收机已经从相同的传输向量接收到一个或多个信号向量。接收机一个接一个地处理这些接收的信号矢量，并且使用已经被处理的信号矢量的信息来处理下一个信号矢量。为了处理当前信号向量，接收器将当前信号向量与先前处理的信号向量进行连接。使用例如最大似然（ML）对该级联信号矢量进行解码。为了解码级联信号向量，ML解码器可以使用包括与当前信号向量相关联的信道响应矩阵和先前信道响应矩阵的处理版本的级联信道矩阵。

8. 发明申请

US20080025443A1 SYMBOL-LEVEL COMBINING 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系统的符号级组合
公开(公告)号：US20080025443A1
公开(公告)日：2008-01-31
申请号：US11781200
申请日：2007-07-20
申请人： Jungwon Lee , Woong Jun Jang , Leilei Song
发明人： Jungwon Lee , Woong Jun Jang , Leilei Song
IPC分类号： H04B7/10
CPC分类号： H04B7/0857
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.
摘要翻译：提供了用于对多输入多输出（MIMO）系统中的信号矢量进行解码的系统和方法，其中接收机已经从相同的传输矢量接收了一个或多个信号矢量。组合接收信号矢量的符号，形成可被视为单个接收信号矢量的组合接收信号矢量。然后使用最大似然解码器对组合的信号矢量进行解码。在一些实施例中，组合的接收信号矢量可以在解码之前被处理。还提供了用于基于解码度量从组合信号向量计算软信息的系统和方法。可以从关键路径提取计算密集型计算，并在预处理器和/或后处理器中实现。

9. 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.

10. 发明授权

US08331475B1 Low complexity technique for log-likelihood ratio computation 有权
标题翻译：对数似然比计算的低复杂度技术
公开(公告)号：US08331475B1
公开(公告)日：2012-12-11
申请号：US12406587
申请日：2009-03-18
申请人： Arul Durai Murugan Palanivelu , Leilei Song , Rohit U. Nabar , Jungwon Lee , Sayandev Mukherjee , Hui-Ling Lou
发明人： Arul Durai Murugan Palanivelu , Leilei Song , Rohit U. Nabar , Jungwon Lee , Sayandev Mukherjee , Hui-Ling Lou
IPC分类号： H04B7/02 , H04L27/28
CPC分类号： H04B7/0413 , H04L25/03242 , H04L25/03961 , H04L25/067 , H04L2025/03414 , H04L2025/0342
摘要： Systems and methods for detecting data in a multiple input/multiple output signal. The method includes receiving a first signal associated with a first data value and a second signal associated with a second data value. A distance value between the received second signal and each possible second data value is calculated. Coordinates for a hypothetical first signal in light of a first possible second data value are calculated, and the first coordinate value is quantized to a nearest constellation point. A distance value between the received second signal and each possible second data value is calculated using the calculated constellation points. A determination is made of a log-likelihood ratio based on the determined distance values.
摘要翻译：用于检测多输入/多输出信号中的数据的系统和方法。该方法包括接收与第一数据值相关联的第一信号和与第二数据值相关联的第二信号。计算接收到的第二信号与每个可能的第二数据值之间的距离值。计算出根据第一可能的第二数据值的假设第一信号的坐标，并且将第一坐标值量化到最接近的星座点。使用所计算的星座点来计算所接收的第二信号与每个可能的第二数据值之间的距离值。基于确定的距离值来确定对数似然比。

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