-
1.发明申请Computation of decision feedback equalizer coefficients with constrained feedback tap energy 有权具有约束反馈抽头能量的判决反馈均衡器系数的计算公开(公告)号：US20050169361A1
公开(公告)日：2005-08-04
申请号：US11090611
申请日：2005-03-25
Applicant: Nabil Yousef , Ricardo Merched
Inventor： Nabil Yousef , Ricardo Merched
CPC classification number: H04L1/06 , H04L25/03057 , H04L2025/0349 , H04L2025/03605
Abstract: Directly computing Feed Forward Equalizer (FFE) coefficients and Feed Back Equalizer (FBE) coefficients of a Decision Feedback Equalizer (DFE) from a channel estimate. The FBE coefficients have an energy constraint. A recursive least squares problem is formulated based upon the DFE configuration, the channel estimate, and the FBE energy constraint. The recursive least squares problem is solved to yield the FFE coefficients. The FFE coefficients are convolved with a convolution matrix that is based upon the channel estimate to yield the FBE coefficients. A solution to the recursive least squares problem is interpreted as a Kalman gain vector. A Kalman gain vector solution to the recursive least squares problem may be determined using a Fast Transversal Filter (FTF) algorithm.
Abstract translation: 从信道估计直接计算判决反馈均衡器（DFE）的前馈均衡器（FFE）系数和反馈均衡器（FBE）系数。 FBE系数具有能量约束。 基于DFE配置，信道估计和FBE能量约束来制定递归最小二乘问题。 求解递归最小二乘问题以产生FFE系数。 FFE系数与基于信道估计的卷积矩阵进行卷积以产生FBE系数。 递归最小二乘问题的解决方案被解释为卡尔曼增益向量。 可以使用快速横向滤波器（FTF）算法来确定递归最小二乘问题的卡尔曼增益向量解。
-
2.发明申请Efficient doppler compensation method and receiver for orthogonal-frequency-division-multiplexing (OFDM) systems 有权用于正交频分复用（OFDM）系统的高效多普勒补偿方法和接收机公开(公告)号：US20070293256A1
公开(公告)日：2007-12-20
申请号：US11471253
申请日：2006-06-20
Applicant: Ricardo Merched , Nabil Yousef
Inventor： Ricardo Merched , Nabil Yousef
CPC classification number: H04L27/3854 , H04B17/309 , H04L27/2602
Abstract: A receiver and method of enhancing transmitted data signals in a wireless communications system includes wirelessly transmitting and receiving a data signal over a wireless channel in the communications system; providing known channel parameters corresponding to the wireless channel; expressing the data signal as an input data vector; replacing indexes in the input data vector having a magnitude greater than one into indexes in the input data vector having a unit norm; creating an output data vector; and calculating a dot product of (i) the input data vector comprising replaced indexes; and (ii) the output data vector, wherein the calculating process equalizes the data signal received by a receiver in the presence of Doppler frequency shifts of the data signal.
Abstract translation: 一种在无线通信系统中增强发射数据信号的接收机和方法包括：在通信系统中通过无线信道无线地发射和接收数据信号; 提供对应于无线信道的已知信道参数; 将数据信号表示为输入数据矢量; 将具有大于1的幅度的输入数据向量中的索引替换为具有单位范数的输入数据向量中的索引; 创建输出数据向量; 并计算（i）包括替代索引的输入数据矢量的点积; 和（ii）所述输出数据矢量，其中所述计算处理在数据信号的多普勒频移的存在下均衡由接收机接收的数据信号。
-
3.发明授权Application of superfast algorithms to a pilot-based channel estimation process 有权将超快速算法应用于基于导频的信道估计过程公开(公告)号：US07907683B2
公开(公告)日：2011-03-15
申请号：US12110622
申请日：2008-04-28
Applicant: Ricardo Merched , Nabil Yousef
Inventor： Ricardo Merched , Nabil Yousef
IPC: H04L27/00
CPC classification number: H04L25/0244 , H04L5/0053 , H04L25/021 , H04L25/022 , H04L25/0236 , H04L25/0246 , H04L25/0248 , H04L25/025 , H04L25/0256 , H04L25/03171 , H04L27/2647
Abstract: An apparatus and method of applying a superfast algorithm to a pilot-based channel estimation process includes receiving a signal comprising information bits transmitted in a wireless channel, executing the pilot-based channel estimation process having p structures for a vector of pilot structures and an upper bound N for a channel spread, determining a result of a matrix inversion of a channel correlation matrix for an error channel estimation offline without performing a matrix inversion, storing pilot information of the received signal for channel recovery in a transform domain, representing the Toeplitz inverse by a FFT representation, detecting and estimating nonzero taps of a channel impulse response of the wireless channel, obtaining a non-structured minimum mean-square-error (MMSE) estimate as a first estimate of locations of the nonzero taps, and replacing the non-structured MMSE estimate by an estimate computed by a tap detection algorithm.
Abstract translation: 一种将超快速算法应用于基于导频的信道估计过程的装置和方法包括：接收包括在无线信道中发送的信息比特的信号，执行具有用于导频结构向量的p个结构的基于导频的信道估计过程， 绑定N用于信道扩展，确定用于误差信道估计的信道相关矩阵的矩阵求逆的结果，而不执行矩阵求逆，在变换域中存储用于信道恢复的接收信号的导频信息，表示Toeplitz反相 通过FFT表示，检测和估计无线信道的信道脉冲响应的非零抽头，获得非结构化最小均方误差（MMSE）估计作为非零抽头的位置的第一估计， 通过抽头检测算法计算的估计结构化MMSE估计。
-
4.发明授权Efficient doppler compensation method and receiver for orthogonal-frequency-division-multiplexing (OFDM) systems 有权用于正交频分复用（OFDM）系统的高效多普勒补偿方法和接收机公开(公告)号：US07424062B2
公开(公告)日：2008-09-09
申请号：US11471253
申请日：2006-06-20
Applicant: Ricardo Merched , Nabil Yousef
Inventor： Ricardo Merched , Nabil Yousef
IPC: H04K1/10
CPC classification number: H04L27/3854 , H04B17/309 , H04L27/2602
Abstract: A receiver and method of enhancing transmitted data signals in a wireless communications system includes wirelessly transmitting and receiving a data signal over a wireless channel in the communications system; providing known channel parameters corresponding to the wireless channel; expressing the data signal as an input data vector; replacing indexes in the input data vector having a magnitude greater than one into indexes in the input data vector having a unit norm; creating an output data vector; and calculating a dot product of (i) the input data vector comprising replaced indexes; and (ii) the output data vector, wherein the calculating process equalizes the data signal received by a receiver in the presence of Doppler frequency shifts of the data signal.
Abstract translation: 一种在无线通信系统中增强发射数据信号的接收机和方法包括：在通信系统中通过无线信道无线地发射和接收数据信号; 提供对应于无线信道的已知信道参数; 将数据信号表示为输入数据矢量; 将具有大于1的幅度的输入数据向量中的索引替换为具有单位范数的输入数据向量中的索引; 创建输出数据向量; 并计算（i）包括替代索引的输入数据矢量的点积; 和（ii）所述输出数据矢量，其中所述计算处理在数据信号的多普勒频移的存在下均衡由接收机接收的数据信号。
-
公开(公告)号：US07940864B2
公开(公告)日：2011-05-10
申请号：US12110637
申请日：2008-04-28
Applicant: Ricardo Merched , Nabil Yousef
Inventor： Ricardo Merched , Nabil Yousef
IPC: H04L27/00
CPC classification number: H04L25/0224 , H04L25/022 , H04L25/024 , H04L25/0244
Abstract: An apparatus and method of applying a fast algorithm to a pilot-based channel estimation process includes receiving, in a receiver, a signal comprising information bits transmitted in a wireless channel, executing a pilot-based channel estimation process running on a decision-directed turbo estimation procedure having a p structure for a vector of pilots and an upper bound N for a channel spread based on a feedback of detected information bits via OFDM, encoding the detected information bits, re-encoding the detected information bits at a decoder output, re-constructing and subtracting an ICI term from the received signal, modulating the detected information bits, estimating channel symbols in a per-carrier basis based on a diagonal matrix of a full matrix involved in the pilot-based channel estimation, and performing training of the wireless channel based on an entire vector of the channel symbols.
Abstract translation: 一种将快速算法应用于基于导频的信道估计过程的装置和方法包括在接收机中接收包括在无线信道中发送的信息比特的信号，执行在决策导向涡轮上运行的基于导频的信道估计过程 估计过程具有用于导频矢量的ap结构和用于通过OFDM的检测到的信息比特的反馈的信道扩展的上限N，对所检测的信息比特进行编码，在解码器输出处重新编码检测到的信息比特， 根据接收到的信号构造和减去ICI项，调制检测到的信息比特，基于在基于导频的信道估计中涉及的全矩阵的对角矩阵，以每载波为基础估计信道符号，以及执行无线 基于信道符号的整个向量的信道。
-
Patent Agency Ranking
6.发明申请Application of Superfast Algorithms to a Pilot-Based Channel Estimation Process 有权超快速算法在基于导频信道估计过程中的应用公开(公告)号：US20090323871A1
公开(公告)日：2009-12-31
申请号：US12110622
申请日：2008-04-28
Applicant: Ricardo Merched , Nabil Yousef
Inventor： Ricardo Merched , Nabil Yousef
IPC: H04B1/10
CPC classification number: H04L25/0244 , H04L5/0053 , H04L25/021 , H04L25/022 , H04L25/0236 , H04L25/0246 , H04L25/0248 , H04L25/025 , H04L25/0256 , H04L25/03171 , H04L27/2647
Abstract: An apparatus and method of applying a superfast algorithm to a pilot-based channel estimation process includes receiving a signal comprising information bits transmitted in a wireless channel, executing the pilot-based channel estimation process having p structures for a vector of pilot structures and an upper bound N for a channel spread, determining a result of a matrix inversion of a channel correlation matrix for an error channel estimation offline without performing a matrix inversion, storing pilot information of the received signal for channel recovery in a transform domain, representing the Toeplitz inverse by a FFT representation, detecting and estimating nonzero taps of a channel impulse response of the wireless channel, obtaining a non-structured minimum mean-square-error (MMSE) estimate as a first estimate of locations of the nonzero taps, and replacing the non-structured MMSE estimate by an estimate computed by a tap detection algorithm.
Abstract translation: 一种将超快速算法应用于基于导频的信道估计过程的装置和方法包括：接收包括在无线信道中发送的信息比特的信号，执行具有用于导频结构向量的p个结构的基于导频的信道估计过程， 绑定N用于信道扩展，确定用于误差信道估计的信道相关矩阵的矩阵求逆的结果，而不执行矩阵求逆，在变换域中存储用于信道恢复的接收信号的导频信息，表示Toeplitz反相 通过FFT表示，检测和估计无线信道的信道脉冲响应的非零抽头，获得非结构化最小均方误差（MMSE）估计作为非零抽头的位置的第一估计， 通过抽头检测算法计算的估计结果化MMSE估计。
-
公开(公告)号：US20090268803A1
公开(公告)日：2009-10-29
申请号：US12110637
申请日：2008-04-28
Applicant: Ricardo Merched , Nabil Yousef
Inventor： Ricardo Merched , Nabil Yousef
CPC classification number: H04L25/0224 , H04L25/022 , H04L25/024 , H04L25/0244
Abstract: An apparatus and method of applying a fast algorithm to a pilot-based channel estimation process includes receiving, in a receiver, a signal comprising information bits transmitted in a wireless channel, executing a pilot-based channel estimation process running on a decision-directed turbo estimation procedure having a p structure for a vector of pilots and an upper bound N for a channel spread based on a feedback of detected information bits via OFDM, encoding the detected information bits, re-encoding the detected information bits at a decoder output, re-constructing and subtracting an ICI term from the received signal, modulating the detected information bits, estimating channel symbols in a per-carrier basis based on a diagonal matrix of a full matrix involved in the pilot-based channel estimation, and performing training of the wireless channel based on an entire vector of the channel symbols.
Abstract translation: 一种将快速算法应用于基于导频的信道估计过程的装置和方法包括在接收机中接收包括在无线信道中发送的信息比特的信号，执行在决策导向涡轮上运行的基于导频的信道估计过程 估计过程具有用于导频矢量的ap结构和用于通过OFDM的检测到的信息比特的反馈的信道扩展的上限N，对所检测的信息比特进行编码，在解码器输出处重新编码检测到的信息比特， 根据接收到的信号构造和减去ICI项，调制检测到的信息比特，基于在基于导频的信道估计中涉及的全矩阵的对角矩阵，以每载波为基础估计信道符号，以及执行无线 基于信道符号的整个向量的信道。
-
公开(公告)号：US07027504B2
公开(公告)日：2006-04-11
申请号：US10044013
申请日：2001-10-26
Applicant: Nabil R. Yousef , Ricardo Merched
Inventor： Nabil R. Yousef , Ricardo Merched
CPC classification number: H04L1/06 , H04L25/03057 , H04L2025/0349 , H04L2025/03605
Abstract: Optimal Decision Feedback Equalizer (DFE) coefficients are determined from a channel estimate h by casting the DFE coefficient problem as a standard recursive least squares (RLS) problem, e.g., the Kalman gain solution to the RLS problem. A fast recursive method, e.g., fast transversal filter (FTF) technique, for computing the Kalman gain is then directly used to compute Feed Forward Equalizer (FFE) coefficients gopt. The complexity of a conventional FTF algorithm is reduced to one third of its original complexity by choosing the length of a Feed Back Equalizer (FBE) coefficients bopt (of the DFE) to force the FTF algorithm to use a lower triangular matrix. The FBE coefficients bopt are then computed by convolving the FFE coefficients gopt with the channel impulse response h. In performing this operation, a convolution matrix that characterizes the channel impulse response h extended to a bigger circulant matrix. With the extended circulant matrix structure, the convolution of the FFE coefficients gopt with the channel impulse response h may be performed in the frequency domain, which can be computed efficiently using the Fast Fourier Transform (FFT).
Abstract translation: 通过将DFE系数问题作为标准递归最小二乘法（RLS）问题，例如对RLS问题的卡尔曼增益解决方案，从信道估计h确定最优判决反馈均衡器（DFE）系数。 然后，直接使用用于计算卡尔曼增益的快速递归方法，例如快速横向滤波器（FTF）技术来计算前馈均衡器（FFE）系数g opt。 常规FTF算法的复杂度通过选择反馈均衡器（FBE）系数（DFE）的长度来减少到原始复杂度的三分之一，以迫使FTF算法使用 一个下三角矩阵。 然后通过将FFE系数g opt opt与通道脉冲响应h进行卷积来计算FBE系数b
。 在执行该操作时，表征信道脉冲响应h的卷积矩阵扩展到更大的循环矩阵。 利用扩展循环矩阵结构，可以在频域中执行FFE系数g opt opt the the与频道脉冲响应h的卷积，频域可以使用快速傅立叶变换（FFT）有效地计算。 -
9.发明授权Fast computation of multi-input-multi-output decision feedback equalizer coefficients 有权多输入多输出判决反馈均衡器系数的快速计算公开(公告)号：US07113540B2
公开(公告)日：2006-09-26
申请号：US10154947
申请日：2002-05-24
Applicant: Nabil R. Yousef , Ricardo Merched
Inventor： Nabil R. Yousef , Ricardo Merched
IPC: H04H7/30
CPC classification number: H04L1/06 , H04L25/03057 , H04L2025/0349 , H04L2025/03605
Abstract: Multi-Input-Multi-Output (MIMO) Optimal Decision Feedback Equalizer (DFE) coefficients are determined from a channel estimate h by casting the MIMO DFE coefficient problem as a standard recursive least squares (RLS) problem and solving the RLS problem. In one embodiment, a fast recursive method, e.g., fast transversal filter (FTF) technique, then used to compute the Kalman gain of the RLS problem, which is then directly used to compute MIMO Feed Forward Equalizer (FFE) coefficients gopt. The complexity of a conventional FTF algorithm is reduced to one third of its original complexity by choosing the length of a MIMO Feed Back Equalizer (FBE) coefficients bopt (of the DFE) to force the FTF algorithm to use a lower triangular matrix. The MIMO FBE coefficients bop are computed by convolving the MIMO FFE coefficients gopt with the channel impulse response h. In performing this operation, a convolution matrix that characterizes the channel impulse response h extended to a bigger circulant matrix. With the extended circulant matrix structure, the convolution of the MIMO FFE coefficients gopt with the channel impulse response h may be performed easily performed in the frequency domain.
Abstract translation: 通过将MIMO DFE系数问题作为标准递归最小二乘法（RLS）问题并解决RLS问题，从信道估计h确定多输入多输出（MIMO）最优判决反馈均衡器（DFE）系数。 在一个实施例中，使用快速递归方法，例如快速横向滤波器（FTF）技术来计算RLS问题的卡尔曼增益，然后直接用于计算MIMO前馈均衡器（FFE）系数g 选择。 常规FTF算法的复杂度通过选择MIMO反馈均衡器（FBE）系数b（DFE）的长度来减小到其原始复杂度的三分之一，以迫使FTF算法 使用下三角矩阵。 通过将MIMO FFE系数g opt opt与信道脉冲响应h进行卷积来计算MIMO FBE系数b
。 在执行该操作时，表征信道脉冲响应h的卷积矩阵扩展到更大的循环矩阵。 利用扩展的循环矩阵结构，可以容易地在频域中执行MIMO FFE系数g≠φopt与信道脉冲响应h的卷积。 -
10.发明授权Computation of decision feedback equalizer coefficients with constrained feedback tap energy 有权具有约束反馈抽头能量的判决反馈均衡器系数的计算公开(公告)号：US07382827B2
公开(公告)日：2008-06-03
申请号：US11090611
申请日：2005-03-25
Applicant: Nabil R. Yousef , Ricardo Merched
Inventor： Nabil R. Yousef , Ricardo Merched
CPC classification number: H04L1/06 , H04L25/03057 , H04L2025/0349 , H04L2025/03605
Abstract: Directly computing Feed Forward Equalizer (FFE) coefficients and Feed Back Equalizer (FBE) coefficients of a Decision Feedback Equalizer (DFE) from a channel estimate. The FBE coefficients have an energy constraint. A recursive least squares problem is formulated based upon the DFE configuration, the channel estimate, and the FBE energy constraint. The recursive least squares problem is solved to yield the FFE coefficients. The FFE coefficients are convolved with a convolution matrix that is based upon the channel estimate to yield the FBE coefficients. A solution to the recursive least squares problem is interpreted as a Kalman gain vector. A Kalman gain vector solution to the recursive least squares problem may be determined using a Fast Transversal Filter (FTF) algorithm.
Abstract translation: 从信道估计直接计算判决反馈均衡器（DFE）的前馈均衡器（FFE）系数和反馈均衡器（FBE）系数。 FBE系数具有能量约束。 基于DFE配置，信道估计和FBE能量约束来制定递归最小二乘问题。 求解递归最小二乘问题以产生FFE系数。 FFE系数与基于信道估计的卷积矩阵进行卷积以产生FBE系数。 递归最小二乘问题的解决方案被解释为卡尔曼增益向量。 可以使用快速横向滤波器（FTF）算法来确定递归最小二乘问题的卡尔曼增益向量解。
-
-
-
-
-
-
-
-
-
Search Results
10
records
(took 0.021 seconds)
