公开(公告)号：US6144697A

公开(公告)日：2000-11-07

申请号：US55682

申请日：1998-04-06

申请人： Saul B. Gelfand ,  Ian J. Fevrier ,  Michael P. Fitz

发明人： Saul B. Gelfand ,  Ian J. Fevrier ,  Michael P. Fitz

IPC分类号： H04B1/12 ,  H04L25/03 ,  H04B1/10 ,  H04L25/08

CPC分类号： H04B1/123 ,  H04L25/03057 ,  H04L25/03987 ,  H04L2025/0349 ,  H04L2025/03566 ,  H04L2025/03617

摘要： Equalization techniques are disclosed to reduce intersymbol interference of a received signal. Intersymbol interference is reduced by feedforward filtering and adjusting the input to the feedforward filter with feedback. This approach facilitates the removal of intersymbol interference from sparse signal portions before sparseness is undermined by other equalization procedures. Also, multiplication operations may be reduced and limited multiplier resources more effectively allocated by applying a threshold test to various multiplier coefficients associated with the equalization technique.

摘要翻译： 公开了均衡技术以减少接收信号的符号间干扰。 通过前馈滤波减少了符号间干扰，并通过反馈调整前馈滤波器的输入。 这种方法有助于在稀疏信号被其他均衡过程破坏之前，从稀疏信号部分去除符号间干扰。 此外，可以通过对与均衡技术相关联的各种乘法器系数应用阈值测试来减少乘法运算并且有效地分配有限的乘数资源。

公开(公告)号：US09559875B2

公开(公告)日：2017-01-31

申请号：US13467394

申请日：2012-05-09

申请人： Daniel N. Liu ,  Michael P. Fitz

发明人： Daniel N. Liu ,  Michael P. Fitz

IPC分类号： H04L25/03

CPC分类号： H04L25/0305 ,  H04L25/03038 ,  H04L2025/03407 ,  H04L2025/0342 ,  H04L2025/03636

摘要： A blind equalizer apparatus includes a decision-directed (DD) least mean squares (LMS) blind equalizer. A blind equalizer apparatus includes: a DD LMS blind equalizer, wherein: the blind equalizer uses a finite impulse response filter with tap weights that are adaptively updated using a filter tap update algorithm, wherein blind equalization of one of an in-phase (I) channel and a quadrature (Q) channel is carried out by maximizing the Euclidean distance of binary modulated waveforms, wherein the blind equalizer averages a block to compute an independent phase estimate for a block, wherein the blind equalizer computes an error variable for a block from the phase estimate for the block, wherein the blind equalizer uses the phase estimate and alternating I/Q one dimensional/binary slicing to make a hard decision, and wherein the blind equalizer uses the hard decision to derive an error variable that is used to update the filter tap weights.

摘要翻译： 盲均衡器装置包括决策导向（DD）最小均方（LMS）盲均衡器。 盲均衡器装置包括：DD LMS盲均衡器，其中：盲均衡器使用具有抽头权重的有限脉冲响应滤波器，使用滤波器抽头更新算法自适应地更新，其中，同步（I） 通过最大化二进制调制波形的欧几里得距离来执行正交（Q）信道，其中盲均衡器对块进行平均以计算块的独立相位估计，其中盲均衡器计算块的误差变量 所述盲均衡器使用所述相位估计和交替I / Q一维/二进制切片作出硬判决，并且其中所述盲均衡器使用所述硬判决来导出用于更新的误差变量 过滤器抽头重量。

公开(公告)号：US20130301697A1

公开(公告)日：2013-11-14

申请号：US13467394

申请日：2012-05-09

申请人： Daniel N. Liu ,  Michael P. Fitz

发明人： Daniel N. Liu ,  Michael P. Fitz

IPC分类号： H04L27/01

CPC分类号： H04L25/0305 ,  H04L25/03038 ,  H04L2025/03407 ,  H04L2025/0342 ,  H04L2025/03636

摘要： A blind equalizer apparatus includes a decision-directed (DD) least mean squares (LMS) blind equalizer. A blind equalizer apparatus includes: a DD LMS blind equalizer, wherein: the blind equalizer uses a finite impulse response filter with tap weights that are adaptively updated using a filter tap update algorithm, wherein blind equalization of one of an in-phase (I) channel and a quadrature (Q) channel is carried out by maximizing the Euclidean distance of binary modulated waveforms, wherein the blind equalizer averages a block to compute an independent phase estimate for a block, wherein the blind equalizer computes an error variable for a block from the phase estimate for the block, wherein the blind equalizer uses the phase estimate and alternating I/Q one dimensional/binary slicing to make a hard decision, and wherein the blind equalizer uses the hard decision to derive an error variable that is used to update the filter tap weights.

摘要翻译： 盲均衡器装置包括决策导向（DD）最小均方（LMS）盲均衡器。 盲均衡器装置包括：DD LMS盲均衡器，其中：盲均衡器使用具有抽头权重的有限脉冲响应滤波器，使用滤波器抽头更新算法自适应地更新，其中，同步（I） 通过最大化二进制调制波形的欧几里得距离来执行正交（Q）信道，其中盲均衡器对块进行平均以计算块的独立相位估计，其中盲均衡器计算块的误差变量 所述盲均衡器使用所述相位估计和交替I / Q一维/二进制切片作出硬判决，并且其中所述盲均衡器使用所述硬判决来导出用于更新的误差变量 过滤器抽头重量。

公开(公告)号：US08351529B2

公开(公告)日：2013-01-08

申请号：US11989055

申请日：2006-07-20

申请人： Massimiliano Siti ,  Michael P. Fitz

发明人： Massimiliano Siti ,  Michael P. Fitz

IPC分类号： H04B7/02 ,  H04L1/02

CPC分类号： H04L25/06 ,  H04L1/0052 ,  H04L1/0054 ,  H04L1/06 ,  H04L25/03292 ,  H04L25/03331 ,  H04L2025/03414

摘要： A method (200a-200b), apparatus (104), and computer program for detecting sequences of digitally modulated symbols transmitted by multiple sources (102, 102a-102t) are provided. A real-domain representation that separately treats in-phase and quadrature components of a received vector, channel gains, and a transmitted vector transmitted by the multiple sources (102, 102a-102t) is determined. The real-domain representation is processed to obtain a triangular matrix. In addition, at least one of the following is performed: (i) hard decision detection of a transmitted sequence and demapping of corresponding bits based on a reduced complexity search of a number of transmit sequences, and (ii) generation of bit soft-output values based on the reduced complexity search of the number of transmit sequences. The reduced complexity search is based on the triangular matrix.

公开(公告)号：US20090154599A1

公开(公告)日：2009-06-18

申请号：US11989055

申请日：2006-07-20

申请人： Massimiliano Siti ,  Michael P. Fitz

发明人： Massimiliano Siti ,  Michael P. Fitz

IPC分类号： H04L27/38 ,  H04L27/06

CPC分类号： H04L25/06 ,  H04L1/0052 ,  H04L1/0054 ,  H04L1/06 ,  H04L25/03292 ,  H04L25/03331 ,  H04L2025/03414

摘要： A method (200a-200b), apparatus (104), and computer program for detecting sequences of digitally modulated symbols transmitted by multiple sources (102, 102a-102t) are provided. A real-domain representation that separately treats in-phase and quadrature components of a received vector, channel gains, and a transmitted vector transmitted by the multiple sources (102, 102a-102t) is determined. The real-domain representation is processed to obtain a triangular matrix. In addition, at least one of the following is performed: (i) hard decision detection of a transmitted sequence and demapping of corresponding bits based on a reduced complexity search of a number of transmit sequences, and (ii) generation of bit soft-output values based on the reduced complexity search of the number of transmit sequences. The reduced complexity search is based on the triangular matrix.

摘要翻译： 提供了一种用于检测由多个源（102,102-102t）发送的数字调制码元的序列的方法（200a-200b），装置（104）和计算机程序。 确定单独处理接收矢量的同相和正交分量，信道增益和由多个源（102,102-102t）发送的发送矢量的实域表示。 处理真实域表示以获得三角矩阵。 另外，执行以下中的至少一个：（i）基于多个发送序列的降低的复杂度搜索，发送序列的硬判决检测和相应比特的解映射，以及（ii）产生位软输出 基于传输序列数量的复杂度降低的搜索值。 降低的复杂度搜索基于三角矩阵。