公开(公告)号：US20090285319A1

公开(公告)日：2009-11-19

申请号：US12466984

申请日：2009-05-15

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu ,  Hui-Ling Lou ,  Quan Zhou

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu ,  Hui-Ling Lou ,  Quan Zhou

IPC分类号： H04L27/28 ,  H04L27/00 ,  H04L27/20

CPC分类号： H04B1/707 ,  H04J13/0014 ,  H04J13/10 ,  H04L27/2613 ,  H04L27/262

摘要： A method for generating a preamble of a data unit for transmission via a communication channel includes generating a first field of the preamble using one of a first sequence or a second sequence, such that the first sequence and the second sequence are complementary sequences such that a sum of out-of-phase aperiodic autocorrelation coefficients of the first sequence and the second sequence is zero; generating, using the other one of the first sequence or the second sequence, an indicator of a start of a second field of the preamble, the second field associated with channel estimation information, such that the indicator of the start of the second field immediately follows the first field; and generating the second field of the preamble.

摘要翻译： 一种用于生成用于经由通信信道进行传输的数据单元的前同步码的方法包括使用第一序列或第二序列中的一个生成前导码的第一字段，使得第一序列和第二序列是互补序列，使得 第一序列和第二序列的异相非周期自相关系数的和为零; 使用所述第一序列或所述第二序列中的另一个序列生成所述前导码的第二字段的开始的指示符，所述第二字段与信道估计信息相关联，使得所述第二字段的开始的指示符紧随其后 第一场; 以及产生所述前导码的第二字段。

公开(公告)号：US20090285241A1

公开(公告)日：2009-11-19

申请号：US12467010

申请日：2009-05-15

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu ,  Hui-Ling Lou

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu ,  Hui-Ling Lou

IPC分类号： H04L29/02

CPC分类号： H04B1/707 ,  H04J13/0014 ,  H04J13/10 ,  H04L27/2613 ,  H04L27/262

摘要： A method for generating a preamble of a data unit includes generating a short training field (STF) of the preamble to include one of a repeating series of a sequences or a repeating series of b sequences, such that a and b are complementary sequences, a sum of out-of-phase aperiodic autocorrelation coefficients of a and b is zero, and where the STF is associated with at least synchronization information, and generating a long training field (LTF) of the preamble after the STF to include a′ sequences and b′ sequences, such that a′ is the sequence a cyclically shifted by zero or more positions, b′ is the sequence b cyclically shifted by zero or more positions, and where the LTF is associated with channel estimation information.

摘要翻译： 一种用于产生数据单元的前同步码的方法包括：产生前导码的短训练场（STF）以包括序列的重复序列或b序列的重复序列中的一个，使得a和b是互补序列，a a和b的异相非周期自相关系数的和为零，并且其中STF至少与同步信息相关联，并且在STF之后生成前导码的长训练场（LTF）以包括“序列和 b'序列，使得'是循环移位零个或多个位置的序列，b'是循环移位零个或多个位置的序列b，并且其中LTF与信道估计信息相关联。

公开(公告)号：US20090262855A1

公开(公告)日：2009-10-22

申请号：US12410044

申请日：2009-03-24

申请人： Jungwon Lee ,  Bhaskar V. Nallapureddy ,  Hui-Ling Lou

发明人： Jungwon Lee ,  Bhaskar V. Nallapureddy ,  Hui-Ling Lou

IPC分类号： H04B7/02 ,  H04L27/00 ,  H04L27/28

CPC分类号： H04L1/0009 ,  H04B7/0669 ,  H04B7/0689 ,  H04B7/0697 ,  H04L1/0625 ,  H04L1/0668 ,  H04L1/1816 ,  H04L1/1845

摘要： A system includes an encoding module, a symbol selection module, a subcarrier selection module, and a mapping module. The encoding module receives symbols for transmission over K subcarriers and T antennas, encodes the symbols using a space time code, and generates space time coded (STC) versions of the symbols, where K and T are integers greater than 1. The symbol selection module selects T adjacent ones of the symbols and selects STC versions of the T adjacent ones of the symbols. The subcarrier selection module selects one of the K subcarriers for transmitting the T adjacent ones of the symbols and the STC versions of the T adjacent ones of the symbols. The mapping module maps the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers, respectively, and maps the STC versions of the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers.

摘要翻译： 系统包括编码模块，符号选择模块，子载波选择模块和映射模块。 编码模块接收用于通过K个子载波和T个天线进行传输的符号，并使用空时码对该符号进行编码，并生成符号的空时编码（STC）版本，其中K和T是大于1的整数。符号选择模块 选择T个相邻的符号，并选择T个相邻符号的STC版本。 子载波选择模块选择用于发送T个相邻符号的T个子载波之一和T个相邻符号的STC版本。 映射模块将T个相邻的符号映射到T个天线上，以便在所选的K个子载波之间分别传输，并将T个相邻的符号的STC版本映射到T个天线上，以便通过所选择的 K个子载波之一。

公开(公告)号：US07529179B1

公开(公告)日：2009-05-05

申请号：US11218809

申请日：2005-09-02

申请人： Jungwon Lee ,  Dimitrios-Alexandros Toumpakaris ,  Hui-Ling Lou

发明人： Jungwon Lee ,  Dimitrios-Alexandros Toumpakaris ,  Hui-Ling Lou

IPC分类号： H04J11/00

CPC分类号： H04L27/2675 ,  H04L25/0228 ,  H04L27/2659

摘要： An Orthogonal Frequency Division Multiplexing (OFDM) receiver is provided that receives a modulated OFDM signal through a channel. The OFDM receiver includes an RF downconverter that generates a downconverted modulated OFDM signal based on the modulated OFDM signal, an analog-to-digital converter (ADC) that generates digitized OFDM symbols based on the downconverted modulated OFDM signal, a carrier-phase correction module that generates time-domain symbols based on the digitized OFDM symbols, a fast Fourier transform (FFT) module that generates frequency-domain symbols based on the time-domain symbols, and an estimator module that receives the frequency-domain symbols and determines an integer carrier frequency offset (CFO) estimate and a channel estimate and that generates respective integer CFO estimate and channel estimate signals.

摘要翻译： 提供了一种通过信道接收经调制的OFDM信号的正交频分复用（OFDM）接收机。 OFDM接收机包括：RF下变频器，其基于经调制的OFDM信号产生下变频调制OFDM信号;基于下变频调制OFDM信号生成数字化OFDM符号的模数转换器（ADC）;载波相位校正模块 基于所述数字化OFDM符号生成时域符号，基于所述时域符号生成频域符号的快速傅立叶变换（FFT）模块以及接收所述频域符号并确定整数的估计器模块 载波频率偏移（CFO）估计和信道估计，并且其产生相应的整数CFO估计和信道估计信号。

公开(公告)号：US07505523B1

公开(公告)日：2009-03-17

申请号：US11031614

申请日：2005-01-07

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： H04K1/10

CPC分类号： H04L27/2675 ,  H04L27/2659 ,  H04L27/2679

摘要： A receiver in an OFDM system may include a maximum likelihood (ML) estimator that estimates the integer part of the carrier frequency offset. The estimator may operate with or without pilot subcarriers. The estimator may calculate the integer frequency offset estimate based on the cyclic shift and phase shift of subcarriers between OFDM symbols.

摘要翻译： OFDM系统中的接收机可以包括估计载波频率偏移的整数部分的最大似然（ML）估计器。 估计器可以在有或没有导频子载波的情况下操作。 估计器可以基于OFDM符号之间的子载波的循环移位和相移来计算整数频率偏移估计。

公开(公告)号：US20090047969A1

公开(公告)日：2009-02-19

申请号：US12189437

申请日：2008-08-11

申请人： Jungwoon Lee ,  Hui-Ling Lou

发明人： Jungwoon Lee ,  Hui-Ling Lou

IPC分类号： H04Q7/20 ,  H04M1/00

CPC分类号： H04L5/0048 ,  H04L5/0062 ,  H04L5/0073

摘要： Systems and methods are provided for transmitting information between an intended source and a receiver to minimize co-channel interference from at least one interfering source. Pilot subcarriers and data subcarriers may be broadcast from an intended source arid at least one interfering source. The pilot subcarriers may be shared across base stations or distributed among base stations in frequency, in time, or both. In addition, the frequency reuse factor of the pilot subcarriers may be different than the frequency reuse factor of the data subcarriers. A receiver receives a composite signal that corresponds with an intended signal from an intended source and an interfering signal from at least one interfering source. The portion of the received signal that corresponds to the intended signal may be recovered by the receiver based on the broadcast of the pilot subcarriers.

摘要翻译： 提供了系统和方法，用于在预期的源和接收机之间传输信息以最小化来自至少一个干扰源的同信道干扰。 导频子载波和数据子载波可以从预期的源和至少一个干扰源广播。 导频子载波可以在基站之间共享或者在频率，时间上或两者中分布在基站之间。 此外，导频子载波的频率重用因子可能不同于数据子载波的频率重用因子。 接收机接收来自预期源的预期信号和来自至少一个干扰源的干扰信号的复合信号。 对应于预期信号的接收信号的部分可以由接收机基于导频子载波的广播来恢复。

公开(公告)号：US07421013B1

公开(公告)日：2008-09-02

申请号：US11026543

申请日：2004-12-30

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： H04L27/30

CPC分类号： H04L27/2657 ,  H04L27/2662 ,  H04L27/2678

摘要： A receiver in an OFDM system may include a joint maximum likelihood (ML) estimator that estimates both time offset and frequency offset. The estimator may use samples in an observation window to estimate the time offset and frequency offset.

摘要翻译： OFDM系统中的接收机可以包括估计时间偏移和频率偏移的联合最大似然（ML）估计器。 估计器可以使用观测窗口中的样本来估计时间偏移和频率偏移。

公开(公告)号：US07406302B1

公开(公告)日：2008-07-29

申请号：US10819649

申请日：2004-04-06

申请人： Hui-Ling Lou

发明人： Hui-Ling Lou

IPC分类号： H04H5/00

CPC分类号： H04H20/48 ,  H04B1/1669 ,  H04H40/45

摘要： Systems and techniques for digital processing of FM stereo signals are described. A carrier signal such as a 38 kHz carrier may be recovered and used to process a difference signal such as a left minus right signal. The left minus right signal and a left plus right signal may be used to generate separate left plus right signals.

摘要翻译： 描述了用于FM立体声信号的数字处理的系统和技术。 可以恢复诸如38kHz载波的载波信号并用于处理诸如左减右信号的差分信号。 可以使用左减右信号和左加权信号来产生单独的左加权信号。

公开(公告)号：US20080037670A1

公开(公告)日：2008-02-14

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： H04K1/10

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：US07065146B1

公开(公告)日：2006-06-20

申请号：US10259024

申请日：2002-09-26

申请人： Hui-Ling Lou ,  Kok-Wui Cheong

发明人： Hui-Ling Lou ,  Kok-Wui Cheong

IPC分类号： H04L23/02 ,  H04B7/02

CPC分类号： H04L25/0328 ,  H04B7/0857 ,  H04L1/0054 ,  H04L25/0206 ,  H04L25/03286 ,  H04L25/03292 ,  H04L2025/03414 ,  H04L2025/03522

摘要： Joint equalization and decoding techniques to eliminate the division operations in the Frequency domain Equalizer (FEQ) of an Orthogonal Frequency Division Modulation (OFDM) receiver by incorporating the magnitude of the channel impulse response estimates into the decision metrics in the decoder. This includes methods for both hard-decision symbol-by-symbol detection and soft-decision decoding using the Viterbi algorithm. Further, Channel State Information (CSI) is incorporated to improve the performance of the receiver. The disclosure also introduces a computationally efficient bit-by-bit piecewise approximation technique incorporating CSI to implement decoder decision metrics. Finally, an efficient implementation technique for multiple receiver antennae using Maximum Ratio Combining (MRC) and Viterbi decoding with CSI is disclosed.

摘要翻译： 联合均衡和解码技术通过将信道脉冲响应估计的幅度并入解码器中的决策度量来消除正交频分调制（OFDM）接收机的频域均衡器（FEQ）中的除法运算。 这包括使用维特比算法进行硬判决逐符号检测和软判决解码的方法。 此外，通过信道状态信息（CSI）来提高接收机的性能。 本公开还引入了一种计算上有效的逐位逼近技术，其包含CSI以实现解码器决策度量。 最后，公开了使用最大比组合（MRC）和维特比解码与CSI的多接收机天线的有效实现技术。