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。

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。

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。

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。

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。

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。

公开(公告)号：US08718166B2

公开(公告)日：2014-05-06

申请号：US11834599

申请日：2007-08-06

申请人： Jungwon Lee ,  Woong Jun Jang ,  Hui-Ling Lou

发明人： Jungwon Lee ,  Woong Jun Jang ,  Hui-Ling Lou

IPC分类号： H04B7/02

CPC分类号： H04L27/01 ,  H04B7/0413 ,  H04B7/0697 ,  H04B7/0845 ,  H04B7/0857 ,  H04L1/08 ,  H04L1/1816 ,  H04L1/1845 ,  H04L2025/03426

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 based on the same transmitted vector. The receiver linearizes each received signal vector using one or more zero-forcing, MMSE, or other suitable linear equalizers. The components of the equalized signal vectors may be combined using maximum-ratio combining to form the components of a combined equalized signal vector. The components of the combined equalized signal vector may then be decoded individually using a linear decoder.

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，其中接收机已经基于相同的传输向量接收了一个或多个信号向量。 接收机使用一个或多个零强制，MMSE或其他合适的线性均衡器来线性化每个接收信号向量。 可以使用最大比合并来组合均衡的信号向量的分量以形成组合的均衡信号向量的分量。 然后可以使用线性解码器单独地解码组合的均衡信号向量的分量。

公开(公告)号：US08571148B1

公开(公告)日：2013-10-29

申请号：US13568747

申请日：2012-08-07

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： H04L27/2655 ,  H04L27/2657 ,  H04L27/2675

摘要： A system including a control module and a correlation module. The control module receives signals, including subcarriers having frequencies in a frequency band, via a plurality of antennas, and divides the frequency band into sub-bands each including a plurality of the subcarriers. The correlation module generates sets of correlation values by correlating symbols in the sub-bands with a plurality of preamble sequences. A set of correlation values is generated for one of the plurality of antennas and is generated based on the preamble sequences. The control module generates sums by adding selected correlation values from the sets. The selected correlation values in a sum are generated respectively for the plurality of antennas and are generated based on one of the preamble sequences. The control module detects a preamble sequence in the signals by determining whether a largest one of the sums is greater than or equal to a predetermined threshold.

摘要翻译： 一种包括控制模块和相关模块的系统。 控制模块经由多个天线接收包括具有频带频率的子载波的信号，并将该频带划分成各自包括多个子载波的子带。 相关模块通过将子带中的符号与多个前同步码序列相关联来生成相关值集合。 为多个天线中的一个天线生成一组相关值，并且基于前导序列生成相关值。 控制模块通过从集合中添加所选的相关值来产生和。 对于多个天线分别产生和中的选择的相关值，并且基于前导码序列之一生成。 控制模块通过确定和中的最大值是否大于或等于预定阈值来检测信号中的前导码序列。

公开(公告)号：US08472906B1

公开(公告)日：2013-06-25

申请号：US13599621

申请日：2012-08-30

申请人： Chris Cheng-Chieh Lee ,  Hui-Ling Lou ,  Jungwon Lee

发明人： Chris Cheng-Chieh Lee ,  Hui-Ling Lou ,  Jungwon Lee

IPC分类号： H04B7/00

CPC分类号： H04B1/1653 ,  H04H40/45

摘要： Disclosed herein are systems and methods for recovering a sub-carrier signal from a multiplexed signal having an embedded pilot tone signal. The recovery system includes circuitry for recovering a pilot signal from the received multiplexed signal, for generating a frequency-doubled signal from the recovered pilot signal, and for phase-shifting the frequency-doubled signal by a pre-determined phase difference from the embedded pilot tone signal. Another recovery system includes circuitry for recovering a pilot signal from the received multiplexed signal, for phase-shifting the pilot signal by a pre-determined phase difference from the embedded pilot tone signal, and for generating a frequency-doubled signal from the phase-shifted signal.

摘要翻译： 这里公开了用于从具有嵌入导频音信号的复用信号中恢复副载波信号的系统和方法。 恢复系统包括用于从所接收的多路复用信号中恢复导频信号的电路，用于从恢复的导频信号产生加倍频的信号，并且将加倍频信号与嵌入式导频相移预定的相位差 音调信号。 另一个恢复系统包括用于从接收到的多路复用信号中恢复导频信号的电路，用于将导频信号与嵌入的导频音信号相位相移预定的相位差，并用于从相移 信号。

公开(公告)号：US08451931B1

公开(公告)日：2013-05-28

申请号：US13403949

申请日：2012-02-23

申请人： Jungwon Lee ,  Jihwan P. Choi ,  Hui-Ling Lou ,  Rohit Nabar ,  Yakun Sun

发明人： Jungwon Lee ,  Jihwan P. Choi ,  Hui-Ling Lou ,  Rohit Nabar ,  Yakun Sun

IPC分类号： H04B7/00

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.