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。

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。

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。

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。

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。

公开(公告)号：US08254503B1

公开(公告)日：2012-08-28

申请号：US13169691

申请日：2011-06-27

申请人： Jungwon Lee ,  Qing Zhao ,  Hui-Ling Lou

发明人： Jungwon Lee ,  Qing Zhao ,  Hui-Ling Lou

IPC分类号： H04B14/06 ,  H04L27/28

CPC分类号： H04L27/08 ,  H03G3/3052 ,  H03G3/3078 ,  H04L27/2626

摘要： An automatic gain control tracking system including a variable gain amplifier and an automatic gain control module. The variable gain amplifier is configured to amplify an input signal in accordance with a first gain, in which i) the input signal comprises a plurality of orthogonal frequency domain multiplexing (OFDM) symbols, and ii) each of the plurality of orthogonal frequency domain multiplexing (OFDM) symbols in the input signal is preceded by a respective cyclic prefix. The automatic gain control module configured to vary the first gain of the variable gain amplifier during the respective cyclic prefix preceding each of the plurality of orthogonal frequency domain multiplexing (OFDM) symbols in the input signal.

摘要翻译： 一种包括可变增益放大器和自动增益控制模块的自动增益控制跟踪系统。 可变增益放大器被配置为根据第一增益放大输入信号，其中i）输入信号包括多个正交频域复用（OFDM）符号，以及ii）多个正交频域复用中的每一个 （OFDM）符号之前是相应的循环前缀。 所述自动增益控制模块被配置为在所述输入信号中的所述多个正交频域复用（OFDM）符号中的每一个之前的相应循环前缀期间改变所述可变增益放大器的第一增益。

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：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。