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21. 发明申请

US20080037620A1 METHOD AND APPARATUS FOR ESTIMATING A NOISE POWER FOR OFDM 审中-公开
标题翻译：用于估计OFDM噪声功率的方法和装置
公开(公告)号：US20080037620A1
公开(公告)日：2008-02-14
申请号：US11835093
申请日：2007-08-07
申请人： Afshin Haghighat , Seyed M. Hosseinian
发明人： Afshin Haghighat , Seyed M. Hosseinian
IPC分类号： H04B3/46 , H04B17/00
CPC分类号： H04L25/0204 , H04B17/345 , H04L1/20 , H04L5/0007 , H04L5/0048
摘要： A method and apparatus for estimating noise for orthogonal frequency division multiplexing (OFDM) are disclosed. A time domain difference signal and a frequency domain difference signal between two consecutive received pilot symbols are calculated. A time domain noise power is calculated from the time domain difference signal and a frequency domain noise power is calculated from the frequency domain difference signal. The time domain noise power and the frequency domain noise power are combined to estimate the noise power.
摘要翻译：公开了一种用于估计正交频分复用（OFDM）噪声的方法和装置。计算两个连续的接收导频符号之间的时域差信号和频域差信号。根据时域差信号计算时域噪声功率，并从频域差分信号计算频域噪声功率。将时域噪声功率和频域噪声功率组合起来估计噪声功率。

22. 发明授权

US08208574B2 Method and apparatus for reducing interference in space frequency block coding communication 有权
标题翻译：降低空间频率块编码通信干扰的方法和装置
公开(公告)号：US08208574B2
公开(公告)日：2012-06-26
申请号：US12117373
申请日：2008-05-08
申请人： Afshin Haghighat , Yingxue Li
发明人： Afshin Haghighat , Yingxue Li
IPC分类号： H04B7/02
CPC分类号： H04L27/28 , H04B1/38 , H04L1/0606 , H04L5/0023
摘要： A method and apparatus of reducing interference in space frequency block coding (SFBC) communication are disclosed. SFBC encoding is performed on at least one pair of symbols. The symbols are assigned to subcarriers in accordance with a frequency assignment pattern assigned to a cell. Different frequency assignment patterns are assigned to neighboring cells. Cells in the network may be divided into a plurality of groups and a different frequency assignment pattern may be assigned to each group of cells. The frequency assignment pattern may be defined such that subcarriers mapped to a pair of symbols in one cell are interlaced to subcarriers mapped to a pair of symbols in a neighbor cell. Alternatively, the frequency assignment pattern may be defined such that subcarriers mapped to a pair of symbols in one cell are shifted in a neighbor cell.
摘要翻译：公开了减少空间频率块编码（SFBC）通信中的干扰的方法和装置。对至少一对符号执行SFBC编码。根据分配给单元的频率分配模式，将符号分配给子载波。不同的频率分配模式被分配给相邻小区。网络中的小区可以被划分成多个组，并且可以将不同的频率分配模式分配给每组小区。可以定义频率分配模式，使得映射到一个小区中的一对符号的副载波被隔行扫描到映射到相邻小区中的一对符号的副载波。或者，可以定义频率分配模式，使得映射到一个小区中的一对符号的副载波在相邻小区中移位。

23. 发明授权

US08670498B2 Method and apparatus for reducing interference in space frequency block coding communication 有权
标题翻译：降低空间频率块编码通信干扰的方法和装置
公开(公告)号：US08670498B2
公开(公告)日：2014-03-11
申请号：US13532267
申请日：2012-06-25
申请人： Afshin Haghighat , Yingxue Li
发明人： Afshin Haghighat , Yingxue Li
IPC分类号： H04B7/02
CPC分类号： H04L27/28 , H04B1/38 , H04L1/0606 , H04L5/0023
摘要： A method and apparatus of reducing interference in space frequency block coding (SFBC) communication are disclosed. SFBC encoding is performed on at least one pair of symbols. The symbols are assigned to subcarriers in accordance with a frequency assignment pattern assigned to a cell. Different frequency assignment patterns are assigned to neighboring cells. Cells in the network may be divided into a plurality of groups and a different frequency assignment pattern may be assigned to each group of cells. The frequency assignment pattern may be defined such that subcarriers mapped to a pair of symbols in one cell are interlaced to subcarriers mapped to a pair of symbols in a neighbor cell. Alternatively, the frequency assignment pattern may be defined such that subcarriers mapped to a pair of symbols in one cell are shifted in a neighbor cell.
摘要翻译：公开了减少空间频率块编码（SFBC）通信中的干扰的方法和装置。对至少一对符号执行SFBC编码。根据分配给单元的频率分配模式，将符号分配给子载波。不同的频率分配模式被分配给相邻小区。网络中的小区可以被划分成多个组，并且可以将不同的频率分配模式分配给每组小区。可以定义频率分配模式，使得映射到一个小区中的一对符号的副载波被隔行扫描到映射到相邻小区中的一对符号的副载波。或者，可以定义频率分配模式，使得映射到一个小区中的一对符号的副载波在相邻小区中移位。

24. 发明授权

US07660344B2 AGC fine-tuning by the adaptive time domain equalizer 有权
标题翻译： AGC通过自适应时域均衡器进行微调
公开(公告)号：US07660344B2
公开(公告)日：2010-02-09
申请号：US10183161
申请日：2002-06-28
申请人： Afshin Haghighat
发明人： Afshin Haghighat
IPC分类号： H04B1/38 , H04L5/16
CPC分类号： H04L25/03019 , H04L27/3809 , H04L2025/0342 , H04L2025/03477
摘要： A method of improvement for gain control for a Quadrature Amplitude Modulation (QAM) signal within a communication system with at least one digital modem. The communication system utilizes a non-decision aided AGC at the intermediate frequency level and a modified Adaptive Time Domain Equalizer (ADTE) to fine tune the level of baseband signals, perform phase and amplitude correction, and channel equalization. The center tap coefficients of or dynamically modified by the ADTE. The resynchronization time and phase and amplitude imbalance correction will be reduced as a consequence of the controlling of the signal gain by a non-decision aided automatic gain controller.
摘要翻译：一种改进用于具有至少一个数字调制解调器的通信系统内的正交幅度调制（QAM）信号的增益控制的方法。通信系统利用中频级别的非决策辅助AGC和改进的自适应时域均衡器（ADTE）来微调基带信号的电平，执行相位和幅度校正以及信道均衡。中间抽头系数或由ADTE动态修改。作为由非决策辅助自动增益控制器控制信号增益的结果，再同步时间和相位和幅度不平衡校正将被减小。

25. 发明申请

US20070049207A1 Communication apparatus and method using forward error correcting statistics for adaptive modulation feedback 有权
标题翻译：使用自适应调制反馈前向纠错统计的通信装置和方法
公开(公告)号：US20070049207A1
公开(公告)日：2007-03-01
申请号：US11211239
申请日：2005-08-25
申请人： Afshin Haghighat , Louis Pouliot
发明人： Afshin Haghighat , Louis Pouliot
IPC分类号： H04B7/00 , H04B1/00
CPC分类号： H04L1/20 , H04B17/24 , H04L1/0003 , H04L1/0025 , H04L1/0045
摘要： Methods and apparatus for wireless communications systems provide adaptive modulation feedback to enhance wireless communications for wireless stations that use forward error correcting (FEC) by basing the adaptive modulation feedback on FEC statistics.
摘要翻译：用于无线通信系统的方法和装置提供自适应调制反馈，以通过基于FEC统计的自适应调制反馈来增强使用前向纠错（FEC）的无线站的无线通信。

26. 发明申请

US20120275496A1 METHOD AND APPARATUS FOR REDUCING INTERFERENCE IN SPACE FREQUENCY BLOCK CODING COMMUNICATION 有权
标题翻译：用于减少空间频率编码通信干扰的方法和装置
公开(公告)号：US20120275496A1
公开(公告)日：2012-11-01
申请号：US13532267
申请日：2012-06-25
申请人： Afshin Haghighat , Yingxue Li
发明人： Afshin Haghighat , Yingxue Li
IPC分类号： H04L27/28 , H04B1/38
CPC分类号： H04L27/28 , H04B1/38 , H04L1/0606 , H04L5/0023
摘要： A method and apparatus of reducing interference in space frequency block coding (SFBC) communication are disclosed. SFBC encoding is performed on at least one pair of symbols. The symbols are assigned to subcarriers in accordance with a frequency assignment pattern assigned to a cell. Different frequency assignment patterns are assigned to neighboring cells. Cells in the network may be divided into a plurality of groups and a different frequency assignment pattern may be assigned to each group of cells. The frequency assignment pattern may be defined such that subcarriers mapped to a pair of symbols in one cell are interlaced to subcarriers mapped to a pair of symbols in a neighbor cell. Alternatively, the frequency assignment pattern may be defined such that subcarriers mapped to a pair of symbols in one cell are shifted in a neighbor cell.
摘要翻译：公开了减少空间频率块编码（SFBC）通信中的干扰的方法和装置。对至少一对符号执行SFBC编码。根据分配给单元的频率分配模式，将符号分配给子载波。不同的频率分配模式被分配给相邻小区。网络中的小区可以被划分成多个组，并且可以将不同的频率分配模式分配给每组小区。可以定义频率分配模式，使得映射到一个小区中的一对符号的副载波被隔行扫描到映射到相邻小区中的一对符号的副载波。或者，可以定义频率分配模式，使得映射到一个小区中的一对符号的副载波在相邻小区中移位。

27. 发明授权

US07769118B2 Method and apparatus for equalizing received signals based on independent component analysis 有权
标题翻译：基于独立分量分析均衡接收信号的方法和装置
公开(公告)号：US07769118B2
公开(公告)日：2010-08-03
申请号：US11618012
申请日：2006-12-29
申请人： Afshin Haghighat
发明人： Afshin Haghighat
IPC分类号： H04B1/10 , H04L27/22
CPC分类号： H04L25/03019 , H04L2025/03605
摘要： The present invention is related to a method and apparatus for blindly equalizing received signals in the time domain based on independent component analysis (ICA). Received signals are demodulated and over-sampled by a rate at least twice the symbol rate to populate a mixing matrix. The received signal samples are cast into the form of a signal separation problem as represented by the multiplication of the mixing matrix with the transmitted symbols such that the unknowns can be solved by ICA. Applying ICA to the received signal samples provides a de-mixing matrix which can be multiplied by the received signal samples to estimate the transmitted symbol sequence. The proposed ICA-based equalization method simultaneously corrects other transmission imperfections, such as DC-offset, carrier phase offset and in-phase and quadrature imbalance, all in the time domain. As an alternative to over-sampling, multiple copies of the received signals are received via a plurality of antennas.
摘要翻译：本发明涉及一种基于独立分量分析（ICA）在时域中盲均衡接收信号的方法和装置。接收到的信号通过至少两倍于符号速率的速率进行解调和过采样，以填充混合矩阵。接收到的信号样本被转换成信号分离问题的形式，如混合矩阵与传输符号的乘法所示，使得未知数可以由ICA求解。将ICA应用于接收到的信号样本提供了可以与接收到的信号样本相乘的去混合矩阵，以估计发送的符号序列。所提出的基于ICA的均衡方法在时域中同时校正其他传输缺陷，例如DC偏移，载波相位偏移和同相和正交不平衡。作为过采样的替代方案，经由多个天线接收接收信号的多个副本。

28. 发明申请

US20080279263A1 METHOD AND APPARATUS FOR REDUCING INTERFERENCE IN SPACE FREQUENCY BLOCK CODING COMMUNICATION 有权
标题翻译：用于减少空间频率编码通信干扰的方法和装置
公开(公告)号：US20080279263A1
公开(公告)日：2008-11-13
申请号：US12117373
申请日：2008-05-08
申请人： Afshin Haghighat , Yingxue Li
发明人： Afshin Haghighat , Yingxue Li
IPC分类号： H04B1/38 , H04B1/10 , H04L27/00
CPC分类号： H04L27/28 , H04B1/38 , H04L1/0606 , H04L5/0023
摘要： A method and apparatus of reducing interference in space frequency block coding (SFBC) communication are disclosed. SFBC encoding is performed on at least one pair of symbols. The symbols are assigned to subcarriers in accordance with a frequency assignment pattern assigned to a cell. Different frequency assignment patterns are assigned to neighboring cells. Cells in the network may be divided into a plurality of groups and a different frequency assignment pattern may be assigned to each group of cells. The frequency assignment pattern may be defined such that subcarriers mapped to a pair of symbols in one cell are interlaced to subcarriers mapped to a pair of symbols in a neighbor cell. Alternatively, the frequency assignment pattern may be defined such that subcarriers mapped to a pair of symbols in one cell are shifted in a neighbor cell.
摘要翻译：公开了减少空间频率块编码（SFBC）通信中的干扰的方法和装置。对至少一对符号执行SFBC编码。根据分配给单元的频率分配模式，将符号分配给子载波。不同的频率分配模式被分配给相邻小区。网络中的小区可以被划分成多个组，并且可以将不同的频率分配模式分配给每组小区。可以定义频率分配模式，使得映射到一个小区中的一对符号的副载波被隔行扫描到映射到相邻小区中的一对符号的副载波。或者，可以定义频率分配模式，使得映射到一个小区中的一对符号的副载波在相邻小区中移位。

29. 发明申请

US20070189427A1 METHOD AND APPARATUS FOR EQUALIZING RECEIVED SIGNALS BASED ON INDEPENDENT COMPONENT ANALYSIS 有权
标题翻译：基于独立分量分析的接收信号均衡的方法与装置
公开(公告)号：US20070189427A1
公开(公告)日：2007-08-16
申请号：US11618012
申请日：2006-12-29
申请人： Afshin Haghighat
发明人： Afshin Haghighat
IPC分类号： H04B1/10
CPC分类号： H04L25/03019 , H04L2025/03605
摘要： The present invention is related to a method and apparatus for blindly equalizing received signals in the time domain based on independent component analysis (ICA). Received signals are demodulated and over-sampled by a rate at least twice the symbol rate to populate a mixing matrix. The received signal samples are cast into the form of a signal separation problem as represented by the multiplication of the mixing matrix with the transmitted symbols such that the unknowns can be solved by ICA. Applying ICA to the received signal samples provides a de-mixing matrix which can be multiplied by the received signal samples to estimate the transmitted symbol sequence. The proposed ICA-based equalization method simultaneously corrects other transmission imperfections, such as DC-offset, carrier phase offset and in-phase and quadrature imbalance, all in the time domain. As an alternative to over-sampling, multiple copies of the received signals are received via a plurality of antennas.
摘要翻译：本发明涉及一种基于独立分量分析（ICA）在时域中盲均衡接收信号的方法和装置。接收到的信号通过至少两倍于符号速率的速率进行解调和过采样，以填充混合矩阵。接收到的信号样本被转换成信号分离问题的形式，如混合矩阵与传输符号的乘法所示，使得未知数可以由ICA求解。将ICA应用于接收到的信号样本提供了可以与接收到的信号样本相乘的去混合矩阵，以估计发送的符号序列。所提出的基于ICA的均衡方法在时域中同时校正其他传输缺陷，例如DC偏移，载波相位偏移和同相和正交不平衡。作为过采样的替代方案，经由多个天线接收接收信号的多个副本。

30. 发明授权

US06657510B2 Corrective phase quadrature modulator system and method 有权
标题翻译：纠正相位调制器系统及方法
公开(公告)号：US06657510B2
公开(公告)日：2003-12-02
申请号：US09993955
申请日：2001-11-27
申请人： Afshin Haghighat
发明人： Afshin Haghighat
IPC分类号： H03C300
CPC分类号： H04L27/362 , H04L2027/0016
摘要： A system and method for producing a phase corrected M-QAM signal is described. In one embodiment, a phase-correcting M-QAM modulator comprises a feedback loop for dynamically adjusting the phase relationship between the two carrier signals as a function of the difference between the phase relationship of the two carrier signals and the phase relationship of the I and Q input signals. In another embodiment where a second carrier signal is derived from the first carrier signal by means of a phase shifting circuit, the amount of phase shift applied to the first carrier signal is a function of the difference between the phase relationship of the two component signals comprising the output QAM signal and the phase relationship between the input I and Q signals.
摘要翻译：描述了一种用于产生相位校正的M-QAM信号的系统和方法。在一个实施例中，相位校正M-QAM调制器包括用于动态地调整两个载波信号之间的相位关系的反馈回路，作为两个载波信号的相位关系与I和 Q输入信号。在通过移相电路从第一载波信号导出第二载波信号的另一实施例中，施加到第一载波信号的相移量是包括两个分量信号的相位关系之间的差的函数，输出QAM信号和输入I和Q信号之间的相位关系。

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