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1. 发明授权

US08964789B1 Method and system for data synchronization in communication systems using repetitive preamble patterns 有权
标题翻译：使用重复前导码模式的通信系统中数据同步的方法和系统
公开(公告)号：US08964789B1
公开(公告)日：2015-02-24
申请号：US12609862
申请日：2009-10-30
申请人： Jungwon Lee , Jiwoong Choi , Qing Zhao , Hui-Ling Lou
发明人： Jungwon Lee , Jiwoong Choi , Qing Zhao , Hui-Ling Lou
IPC分类号： H04J3/06
CPC分类号： H04L27/2643 , H04L7/042 , H04L27/2613 , H04L27/2656 , H04L2027/0026
摘要： Methods and apparatus for data synchronization in communication systems using repetitive preamble patterns. In one embodiment, a method includes receiving a signal, where the received signal includes a data unit. The data unit includes a preamble symbol, and the preamble symbol has a start time and includes Q portions, each having the same pattern. The method further includes determining multiple possible values of a frame timing (FT). The method further includes determining multiple correlation functions including at least one correlation function corresponding to each of the multiple possible values of the FT, such that a given correlation function corresponding to a given possible value of the FT represents a correlation between data in two non-adjacent portions of the Q portions associated with the given FT. The method further includes selecting one of the multiple possible values of the FT based at least in part on the multiple determined correlation functions.
摘要翻译：使用重复前导码模式的通信系统中的数据同步的方法和装置。在一个实施例中，一种方法包括接收信号，其中所接收的信号包括数据单元。数据单元包括前导符号，并且前导码符号具有开始时间，并且包括各自具有相同模式的Q个部分。该方法还包括确定帧定时（FT）的多个可能值。该方法还包括确定包括与FT的多个可能值中的每一个相对应的至少一个相关函数的多个相关函数，使得对应于FT的给定可能值的给定相关函数表示两个非可变值中的数据之间的相关性，与给定FT相关联的Q部分的相邻部分。该方法还包括至少部分地基于多个确定的相关函数来选择FT的多个可能值中的一个。

2. 发明授权

US08428169B1 MIMO soft demodulation using hard-decision candidate selection 有权
标题翻译：使用硬判决候选选择的MIMO软解调
公开(公告)号：US08428169B1
公开(公告)日：2013-04-23
申请号：US12510037
申请日：2009-07-27
申请人： Jungwon Lee , Jiwoong Choi , Hui-Ling Lou
发明人： Jungwon Lee , Jiwoong Choi , Hui-Ling Lou
IPC分类号： H04B7/02
CPC分类号： H04L25/03891 , H04B7/0413 , H04B7/0854 , H04L25/067
摘要： Systems and methods for reconstructing digital information in a multiple-input receiver from signals transmitted by a multiple-output transmitter, in a multiple-input multiple-output (MIMO) communications channel are provided. A plurality of signal streams are obtained from a plurality of transmitted signals and a first candidate signal value is selected for each of the plurality of signal streams. A plurality of additional candidate signal values are also selected for each of the plurality of signal streams in response to selecting the first candidate signal value. A log-likelihood ratio (LLR) is computed from the plurality of signal streams based on all of the selected candidate signal values. Digital information may then be estimated based on the computed LLR.
摘要翻译：提供了在多输入多输出（MIMO）通信信道中由多输出发射机发送的信号重建多输入接收机中的数字信息的系统和方法。从多个发送信号中获得多个信号流，并且为多个信号流中的每一个选择第一候选信号值。响应于选择第一候选信号值，还为多个信号流中的每一个选择多个附加候选信号值。基于所选择的所有候选信号值，从多个信号流计算对数似然比（LLR）。然后可以基于所计算的LLR来估计数字信息。

3. 发明授权

US08401127B1 Multi-stream soft demodulation using hard-decision schemes 有权
标题翻译：使用硬判决方案的多流软解调
公开(公告)号：US08401127B1
公开(公告)日：2013-03-19
申请号：US12469382
申请日：2009-05-20
申请人： Jungwon Lee , Jiwoong Choi , Hui-Ling Lou
发明人： Jungwon Lee , Jiwoong Choi , Hui-Ling Lou
IPC分类号： H04B7/02 , H04B7/08 , H04L1/06 , H04L27/06
CPC分类号： H04B7/0413 , H04L1/0041 , H04L1/0045 , H04L1/06 , H04L25/03242 , H04L25/067
摘要： A method of decoding a signal transmitted via a multiple input multiple output (MIMO) communication channel includes receiving a data symbol vector including multiple data symbols that are received at substantially the same time. The received data symbol vector corresponds to a transmitted data symbol vector including multiple transmitted data symbols corresponding to the plurality of data symbols. The method further includes estimating values for transmitted data symbols in a first group of transmitted data symbols using a hard-decision technique. The method further includes calculating likelihood values for bits in a second group of transmitted data symbols using a soft-decision technique based on the estimated values of transmitted data symbols in the first group of transmitted data symbols. The first group of transmitted data symbols does not overlap with the second group of transmitted symbols.
摘要翻译：一种对通过多输入多输出（MIMO）通信信道发送的信号进行解码的方法包括：接收包括多个数据符号的数据符号向量，该数据符号向量基本上同时被接收。所接收的数据符号向量对应于包括对应于多个数据符号的多个发送数据符号的发送数据符号向量。该方法还包括使用硬判决技术估计第一组发送数据符号中的发送数据符号的值。该方法还包括使用基于所发送的数据符号的第一组中所发送的数据符号的估计值的软判决技术来计算第二组发送数据符号中的比特的似然值。第一组发送数据符号与第二组发送符号不重叠。

4. 发明授权

US08351549B1 Multi-stream demodulation scheme using multiple detectors 有权
标题翻译：使用多个检测器的多流解调方案
公开(公告)号：US08351549B1
公开(公告)日：2013-01-08
申请号：US12562687
申请日：2009-09-18
申请人： Jiwoong Choi , Jungwon Lee , Hui-Ling Lou
发明人： Jiwoong Choi , Jungwon Lee , Hui-Ling Lou
IPC分类号： H04L27/06 , H04L27/28
CPC分类号： H04L1/0631 , H04B7/0413 , H04L1/0054 , H04L25/067 , H04L27/2647 , H04L27/34
摘要： The present disclosure provides methods and apparatus for demodulating a signal transmitted via a multiple input multiple output (MIMO) communication channel. In one embodiment, a method of demodulating a signal transmitted via a MIMO communication channel includes receiving a data symbol vector including multiple data symbols that are received at substantially the same time. The received data symbol vector corresponds to a transmitted data symbol vector. The method further includes generating multiple candidate vectors for the transmitted data symbol vector. The multiple candidate vectors are less than all possible vectors for the transmitted data symbol vector. The method further includes selecting one candidate vector from the multiple candidate vectors using a maximum-likelihood (ML) technique.
摘要翻译：本公开提供了用于解调经由多输入多输出（MIMO）通信信道发送的信号的方法和装置。在一个实施例中，一种解调经由MIMO通信信道发送的信号的方法包括：接收包括在同一时间被接收的多个数据符号的数据符号向量。接收到的数据符号向量对应于发送的数据符号向量。该方法还包括为所发送的数据符号向量生成多个候选向量。多个候选向量小于所发送的数据符号向量的所有可能向量。该方法还包括使用最大似然（ML）技术从多个候选向量中选择一个候选向量。

5. 发明授权

US08238488B1 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：US08238488B1
公开(公告)日：2012-08-07
申请号：US12547285
申请日：2009-08-25
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 method of decoding a signal includes receiving multiple data symbols corresponding to multiple transmitted data symbols. The method further includes selecting one candidate data symbol from multiple candidate data symbols corresponding to the multiple transmitted data symbols. The method further includes determining a global optimum candidate value for the selected one candidate data symbol. The method further includes grouping all possible values of the selected one candidate data symbol into two or more bit groups. The method further includes selecting a bit group from the two or more bit groups that does not include the global optimum value. The method further includes determining a local optimum candidate value from values in the selected bit group. The method further includes calculating a likelihood value for a bit in the selected one candidate data symbol based at least in part on the determined global and local optimum candidate values.
摘要翻译：解码信号的方法包括接收与多个发送的数据符号对应的多个数据符号。该方法还包括从对应于多个发送的数据符号的多个候选数据符号中选择一个候选数据符号。该方法还包括确定所选择的一个候选数据符号的全局最佳候选值。该方法还包括将所选择的一个候选数据符号的所有可能值分组为两个或更多位组。该方法还包括从不包括全局最优值的两个或多个比特组中选择一个比特组。该方法还包括从所选位组中的值确定局部最佳候选值。该方法还包括至少部分地基于所确定的全局和局部最佳候选值来计算所选择的一个候选数据符号中的比特的似然值。

6. 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。

7. 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。

8. 发明授权

US07970066B1 Tracking automatic gain control of orthogonal frequency domain multiplexing systems 有权
标题翻译：跟踪正交频域复用系统的自动增益控制
公开(公告)号：US07970066B1
公开(公告)日：2011-06-28
申请号：US11963294
申请日：2007-12-21
申请人： Jungwon Lee , Qing Zhao , Hui-Ling Lou
发明人： Jungwon Lee , Qing Zhao , Hui-Ling Lou
IPC分类号： H04L27/28
CPC分类号： H04L27/08 , H03G3/3052 , H03G3/3078 , H04L27/2626
摘要： A system includes an input, a variable gain amplifier (VGA), and an automatic gain control (AGC) module. The input receives an input signal. The input signal includes frames of N symbols modulated using orthogonal frequency division multiplexing (OFDM), wherein a cyclic prefix (CP) precedes each of the N symbols, and wherein N is an integer greater than 1. The VGA provides a gain when amplifying the input signal. The AGC module selectively adjusts the gain of the VGA during the CP preceding M of the N symbols, wherein M is an integer greater than 1.
摘要翻译：一种系统包括输入，可变增益放大器（VGA）和自动增益控制（AGC）模块。输入接收输入信号。输入信号包括使用正交频分复用（OFDM）调制的N个符号的帧，其中循环前缀（CP）在N个符号之前，并且其中N是大于1的整数。当VGA放大输入信号。 AGC模块在N个符号之前的M之前的CP期间选择性地调整VGA的增益，其中M是大于1的整数。

9. 发明授权

US08494097B1 Tracking automatic gain control of orthogonal frequency domain multiplexing systems 有权
标题翻译：跟踪正交频域复用系统的自动增益控制
公开(公告)号：US08494097B1
公开(公告)日：2013-07-23
申请号：US13596513
申请日：2012-08-28
申请人： Jungwon Lee , Qing Zhao , Hui-Ling Lou
发明人： Jungwon Lee , Qing Zhao , Hui-Ling Lou
IPC分类号： H04L27/08 , H04L27/28
CPC分类号： H04L27/08 , H03G3/3052 , H03G3/3078 , H04L27/2626
摘要： A system including a variable gain amplifier, an automatic gain control module, and a channel estimation module. The variable gain amplifier amplifies an input signal in accordance with a gain. The input signal includes a plurality of orthogonal frequency domain multiplexing symbols. Each of the plurality of orthogonal frequency domain multiplexing symbols is preceded by a respective cyclic prefix. The automatic gain control module adjusts, based on a signal strength of the input signal, the gain of the variable gain amplifier during the respective cyclic prefix preceding each of the plurality of orthogonal frequency domain multiplexing symbols. The automatic gain control module generates a control signal in response to the gain of the variable gain amplifier being adjusted. The channel estimation module generates a channel estimate for each of the plurality of orthogonal frequency domain multiplexing symbols and updates the channel estimate based on the control signal.
摘要翻译：一种包括可变增益放大器，自动增益控制模块和信道估计模块的系统。可变增益放大器根据增益来放大输入信号。输入信号包括多个正交频域复用符号。多个正交频域复用符号中的每一个前面都有相应的循环前缀。所述自动增益控制模块基于所述输入信号的信号强度，在所述多个正交频域复用符号之前的各个循环前缀期间，调整所述可变增益放大器的增益。自动增益控制模块响应于可调增益放大器的增益而产生控制信号。信道估计模块为多个正交频域多路复用符号中的每一个生成信道估计，并且基于控制信号来更新信道估计。

10. 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。

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