公开(公告)号：US20240356787A1

公开(公告)日：2024-10-24

申请号：US18686892

申请日：2021-08-27

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Keita KURIYAMA ,  Hayato FUKUZONO ,  Masafumi YOSHIOKA ,  Toshifumi MIYAGI

IPC: H04L25/03 ,  H04B7/0456

CPC classification number: H04L25/03343 ,  H04B7/0456 ,  H04L2025/03585

Abstract: A wireless communication method according to an embodiment includes precoding a stream of a transmission signal in a time domain by using an FIR filter, controlling a transmission power of the precoded stream, amplifying the precoded stream such that the controlled transmission power is obtained; and performing control for changing a tap length in precoding such that the tap length is decreased in a case where a magnitude of a last tap coefficient in precoding is small and the tap length is increased in a case where the magnitude is large, with respect to a threshold value calculated on the basis of quality information of a received signal fed back from a reception device that has received the amplified stream or quality information of a received signal calculated by using at least characteristics of an amplifier.

公开(公告)号：US09025656B1

公开(公告)日：2015-05-05

申请号：US14106389

申请日：2013-12-13

Applicant: Altera Corporation

Inventor： Sangeeta Raman ,  Tim Tri Hoang ,  Wilson Wong ,  Jie Shen

IPC: H03H7/30 ,  H03H7/40 ,  H03K5/159 ,  H04L25/03

CPC classification number: H04L25/03878 ,  H04L25/03019 ,  H04L25/03146 ,  H04L2025/03566 ,  H04L2025/03579 ,  H04L2025/03585

Abstract: The present disclosure provides a floating-tap decision feedback equalization (DFE) circuit. In an exemplary implementation, the floating-tap DFE circuit may include a high-speed shift register, a deserializer and data selector, a bypass deserializer, a high-speed multiplexer and a tap generation circuit. In one aspect of the invention, the floating-tap DFE circuit may advantageously cover an entire tap range beyond a fixed tap range without holes over a range of data rates. Other embodiments, aspects and features are also disclosed.

Abstract translation: 本公开提供浮动抽头判决反馈均衡（DFE）电路。 在示例性实现中，浮动抽头DFE电路可以包括高速移位寄存器，解串器和数据选择器，旁路解串器，高速多路复用器和抽头生成电路。 在本发明的一个方面，浮动抽头DFE电路可有利地覆盖超过一定范围的数据速率的无孔的固定抽头范围的整个抽头范围。 还公开了其它实施例，方面和特征。

公开(公告)号：US08654912B2

公开(公告)日：2014-02-18

申请号：US11545437

申请日：2006-10-10

Applicant: Joseph R. Cleveland ,  Eran Pisek

Inventor： Joseph R. Cleveland ,  Eran Pisek

IPC: H04B1/10

CPC classification number: H04B7/04 ,  H03H2218/06 ,  H04B17/327 ,  H04L2025/03535 ,  H04L2025/03585

Abstract: MIMO transmitter with a reconfigurable pooled digital filter is disclosed. A processor uses the output of an envelope detector to set parameters of the filter to minimize the number of instructions per second and the amount of power required by the filter to perform. The processor uses an algorithm or a lookup table stored in memory to select the combination of filter parameters. The parameters may be selected from at least one of: a number of taps, a filter length, a word length, a coefficient quantization, a sampling rate, bits per sample, a sampling bit, a tap delay and a coefficient length. After selecting a combination of filter parameters, the processor sends a control signal to the adaptive filter. The pooled adaptive filter reconfigures itself in accordance with the selected filter parameters.

Abstract translation: 公开了具有可重新组合的数字滤波器的MIMO发射机。 处理器使用包络检测器的输出来设置滤波器的参数以最小化每秒指令的数量以及滤波器执行所需的功率量。 处理器使用存储在存储器中的算法或查找表来选择滤波器参数的组合。 这些参数可以从以下中的至少一个中选择：多个抽头，滤波器长度，字长，系数量化，采样率，每采样位，采样位，抽头延迟和系数长度。 选择滤波器参数的组合后，处理器向自适应滤波器发送控制信号。 合并的自适应滤波器根据所选择的滤波器参数重新配置自身。

公开(公告)号：US08265130B2

公开(公告)日：2012-09-11

申请号：US12512203

申请日：2009-07-30

Applicant: Philip J. Pietraski ,  Mihaela C. Beluri ,  Alpaslan Demir ,  Jung-Lin Pan ,  Gregory S. Sternberg ,  Rui Yang ,  Bin Li

Inventor： Philip J. Pietraski ,  Mihaela C. Beluri ,  Alpaslan Demir ,  Jung-Lin Pan ,  Gregory S. Sternberg ,  Rui Yang ,  Bin Li

IPC: H03H7/40 ,  H03K5/159

CPC classification number: H04L25/03038 ,  H04B1/7097 ,  H04L27/0014 ,  H04L2025/03509 ,  H04L2025/03547 ,  H04L2025/03585 ,  H04L2025/03611 ,  H04L2025/03617 ,  H04L2025/03687 ,  H04L2027/003 ,  H04L2027/0038 ,  H04L2027/0065

Abstract: An adaptive equalizer including an equalizer filter and a tap coefficients generator used to process a sample data stream derived from a plurality of received signals is disclosed. The tap coefficients generator includes an equalizer tap update unit, a vector norm square estimator, an active taps mask generator, a switch and a pilot amplitude reference unit used to minimize the dynamic range of the equalizer filter. A dynamic mask vector is used to mask active taps generated by the equalizer tap update unit when an unmasked signal output by the equalizer filter is selected by the switch to generate an error signal fed to the equalizer tap update unit. A fixed mask vector is used to mask active taps generated by the equalizer tap update unit when a masked signal output by the equalizer filter is used to generate the error signal.

Abstract translation: 公开了一种包括均衡器滤波器和用于处理从多个接收信号导出的采样数据流的抽头系数发生器的自适应均衡器。 抽头系数发生器包括均衡器抽头更新单元，矢量范数平方估计器，有源抽头掩码发生器，用于最小化均衡器滤波器的动态范围的开关和导频振幅参考单元。 当由开关选择由均衡器滤波器输出的未屏蔽信号以产生馈送到均衡器抽头更新单元的误差信号时，动态屏蔽矢量用于屏蔽均衡器抽头更新单元产生的有效抽头。 当使用由均衡器滤波器输出的屏蔽信号来产生误差信号时，固定屏蔽矢量用于屏蔽均衡器抽头更新单元产生的有源抽头。

公开(公告)号：US07894514B2

公开(公告)日：2011-02-22

申请号：US11238847

申请日：2005-09-29

Applicant: Francis Dominique ,  Laurence E. Mailaender ,  Reza Mardani ,  Francis Joseph Mullany

Inventor： Francis Dominique ,  Laurence E. Mailaender ,  Reza Mardani ,  Francis Joseph Mullany

IPC: H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC classification number: H04L25/03019 ,  H04B1/7115 ,  H04L2025/03585

Abstract: A receiver device for use in a wireless communication system (20) includes a rake receiver (32) and an equalizer receiver (34). A controller (36) selects one of the rake receiver (32) or the equalizer receiver (34) for processing a received signal. In some situations, the rake receiver (32) will provide better performance. In other situations, the equalizer receiver (34) will provide better performance. One embodiment includes a plurality of equalizers (34A, 34B). One of the equalizers processes a data packet from a received signal while another one of the equalizers trains for processing a signal from a subsequent scheduled user. Another example embodiment includes controlling an equalizer length based on a delay span or another selected channel metric.

Abstract translation: 一种在无线通信系统（20）中使用的接收机设备包括耙式接收器（32）和均衡器接收器（34）。 控制器（36）选择耙式接收器（32）或均衡器接收器（34）中的一个来处理接收到的信号。 在某些情况下，耙式接收器（32）将提供更好的性能。 在其他情况下，均衡器接收器（34）将提供更好的性能。 一个实施例包括多个均衡器（34A，34B）。 一个均衡器处理来自接收信号的数据分组，而另一个均衡器用于处理来自后续调度用户的信号。 另一示例性实施例包括基于延迟范围或另一选择的信道度量来控制均衡器长度。

公开(公告)号：US20080063042A1

公开(公告)日：2008-03-13

申请号：US11530939

申请日：2006-09-12

Applicant: Yih-Ming Tsuie ,  Ming-Luen Liou

Inventor： Yih-Ming Tsuie ,  Ming-Luen Liou

IPC: H03H7/30

CPC classification number: H04L25/03063 ,  H04L25/0216 ,  H04L2025/03585

Abstract: An equalization method receiving a received sample to generate an equalizer output. A channel profile is first provided, comprising a main path and a plurality of echoes distributed in time domain. Echoes anterior to the main path are precursors, and echoes posterior to the main path are postcursors. The received sample is filtered with a linear equalizer (LE) comprising a plurality of taps to generate an LE output. A slicer slices the equalizer output to generate a sliced sample. The sliced sample is further sent to a decision feedback equalizer (DFE) comprising a plurality of taps to generate a DFE output. Simultaneously, an equalizer span is determined based on the channel profile. The LE output and the DFE output are combined to generate the equalizer output having the equalizer span. The equalizer span is determined by allocating the position of main tap.

Abstract translation: 接收接收的采样以产生均衡器输出的均衡方法。 首先提供一个信道简档，包括一个主路径和多个在时域上分布的回波。 在主路径前面的回波是前体，主路径后面的回波是后端。 接收的样本被包括多个抽头的线性均衡器（LE）滤波以产生LE输出。 切片器切片均衡器输出以生成切片样本。 切片样品进一步发送到包括多个抽头的判决反馈均衡器（DFE）以产生DFE输出。 同时，基于通道轮廓来确定均衡器跨度。 LE输出和DFE输出被组合以产生具有均衡器跨度的均衡器输出。 通过分配主抽头的位置确定均衡器跨度。

公开(公告)号：US07321620B2

公开(公告)日：2008-01-22

申请号：US10383746

申请日：2003-03-10

Applicant: Hiroyuki Nakahira ,  Koichi Nagano ,  Koji Okamoto ,  Akira Yamamoto

Inventor： Hiroyuki Nakahira ,  Koichi Nagano ,  Koji Okamoto ,  Akira Yamamoto

IPC: H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC classification number: H04L25/03038 ,  H04L2025/03477 ,  H04L2025/03585 ,  H04L2025/03617

Abstract: The present invention provides an equalizer capable of accurately compensating for non-linearity of an input signal due to the asymmetry phenomenon, etc., during the disk production process. Two tap coefficients are provided in a coefficient unit. A comparator compares the value of a middle tap signal, which is a reference signal, and a threshold, so as to produce a selection signal based on the comparison result. The coefficient unit selects one of the two tap coefficients as the selected tap coefficient based on the selection signal, and a tap signal is multiplied with the selected tap coefficient. Thus, it is possible to adaptively switch the tap coefficients of the equalizer as a whole based on the value of the middle tap signal, which is the reference signal. Therefore, it is possible to accurately compensate for the non-linearity of the input signal.

Abstract translation: 本发明提供了一种均衡器，其能够在盘生产过程期间由于不对称现象等而精确地补偿输入信号的非线性。 在系数单元中提供两个抽头系数。 比较器将作为参考信号的中间抽头信号的值与阈值进行比较，以便基于比较结果产生选择信号。 系数单元基于选择信号选择两个抽头系数中的一个作为所选抽头系数，并且抽头信号与选择的抽头系数相乘。 因此，可以基于作为参考信号的中间抽头信号的值来自适应地切换均衡器的抽头系数作为整体。 因此，可以准确地补偿输入信号的非线性。

公开(公告)号：US20070258544A1

公开(公告)日：2007-11-08

申请号：US11545437

申请日：2006-10-10

Applicant: Joseph R. Cleveland ,  Eran Pisek

Inventor： Joseph R. Cleveland ,  Eran Pisek

IPC: H04L27/00

CPC classification number: H04B7/04 ,  H03H2218/06 ,  H04B17/327 ,  H04L2025/03535 ,  H04L2025/03585

Abstract: MIMO transmitter with a reconfigurable pooled digital filter is disclosed. A processor uses the output of an envelope detector to set parameters of the filter to minimize the number of instructions per second and the amount of power required by the filter to perform. The processor uses an algorithm or a lookup table stored in memory to select the combination of filter parameters. The parameters may be selected from at least one of: a number of taps, a filter length, a word length, a coefficient quantization, a sampling rate, bits per sample, a sampling bit, a tap delay and a coefficient length. After selecting a combination of filter parameters, the processor sends a control signal to the adaptive filter. The pooled adaptive filter reconfigures itself in accordance with the selected filter parameters.

Abstract translation: 公开了具有可重新组合的数字滤波器的MIMO发射机。 处理器使用包络检测器的输出来设置滤波器的参数以最小化每秒指令的数量以及滤波器执行所需的功率量。 处理器使用存储在存储器中的算法或查找表来选择滤波器参数的组合。 这些参数可以从以下中的至少一个中选择：多个抽头，滤波器长度，字长，系数量化，采样率，每采样位，采样位，抽头延迟和系数长度。 选择滤波器参数的组合后，处理器向自适应滤波器发送控制信号。 合并的自适应滤波器根据所选择的滤波器参数重新配置自身。

公开(公告)号：US20060171451A1

公开(公告)日：2006-08-03

申请号：US11265373

申请日：2005-11-02

Applicant: Philip Pietraski ,  Mihaela Beluri ,  Alpaslan Demir ,  Jung-Lin Pan ,  Gregory Sternberg ,  Rui Yang ,  Bin Li

Inventor： Philip Pietraski ,  Mihaela Beluri ,  Alpaslan Demir ,  Jung-Lin Pan ,  Gregory Sternberg ,  Rui Yang ,  Bin Li

IPC: H03K5/159

CPC classification number: H04L25/03038 ,  H04B1/7097 ,  H04L27/0014 ,  H04L2025/03509 ,  H04L2025/03547 ,  H04L2025/03585 ,  H04L2025/03611 ,  H04L2025/03617 ,  H04L2025/03687 ,  H04L2027/003 ,  H04L2027/0038 ,  H04L2027/0065

Abstract: An adaptive equalizer including an equalizer filter and a tap coefficients generator used to process a sample data stream derived from a plurality of received signals is disclosed. The tap coefficients generator includes an equalizer tap update unit, a vector norm square estimator, an active taps mask generator, a switch and a pilot amplitude reference unit used to minimize the dynamic range of the equalizer filter. A dynamic mask vector is used to mask active taps generated by the equalizer tap update unit when an unmasked signal output by the equalizer filter is selected by the switch to generate an error signal fed to the equalizer tap update unit. A fixed mask vector is used to mask active taps generated by the equalizer tap update unit when a masked signal output by the equalizer filter is used to generate the error signal.

公开(公告)号：US20060029164A1

公开(公告)日：2006-02-09

申请号：US11197222

申请日：2005-08-04

Applicant: Sung-Hyun Hwang

Inventor： Sung-Hyun Hwang

IPC: H04L27/06 ,  H04B1/10

CPC classification number: H04L25/03019 ,  H04L25/0216 ,  H04L2025/0349 ,  H04L2025/03585

Abstract: A wired/wireless communication receiver includes an equalizer through multipath delay estimation and a signal receiving method. The receiver includes a delay spread estimation unit, a factor updating unit, and an equalizer. The delay spread estimation unit estimates a delay spread value of a received signal and uses a symbol boundary information signal to determine a filtering tap length value and a filtering step size value from an estimated delay spread value. The factor updating unit updates filtering factors using the filtering tap length value and the filtering step size value. The equalizer compensates distortion of the received signal using the filtering factors.