公开(公告)号：US06141378A

公开(公告)日：2000-10-31

申请号：US340621

申请日：1999-06-28

申请人： Maximilien d'Oreye de Lantremange

发明人： Maximilien d'Oreye de Lantremange

IPC分类号： H04B3/06 ,  H04B7/005 ,  H04L7/00 ,  H04L7/02 ,  H04L25/03 ,  H04L25/04 ,  H04L25/06 ,  H04L27/01 ,  H04L27/38 ,  H04B3/46 ,  H04B17/00 ,  H04Q1/20 ,  H04H7/40

CPC分类号： H04L7/0058 ,  H04L25/03044 ,  H04L25/0305 ,  H04L25/03063 ,  H04L25/067 ,  H04L27/3872 ,  H04L7/0029 ,  H04L2025/0342 ,  H04L2025/0349 ,  H04L2025/03509 ,  H04L2025/03617 ,  H04L2025/03681 ,  H04L7/0004

摘要： A fractionally-spaced adaptively-equalized self-recovering digital receiver includes a fractionally-spaced adaptive filter for equalizing channel distortion which includes means for adaptively adjusting the coefficients of the fractionally-spaced filter with a self-recovering (blind) algorithm or a decision directed algorithm; means for changing the timing at which the data is sampled; means for estimating the sampling frequency offset in order to derive the optimal timing; means for synchronizing the signal resampling at the symbol rate using the statistics of the received data samples; means for evaluating the profile of the equalizer coefficients; and means for tracking carrier frequency offset.

摘要翻译： 分数间隔自适应均衡的自恢复数字接收机包括用于均衡信道失真的分数间隔自适应滤波器，其包括用自恢复（盲）算法或指导的决策自适应地调整分数间隔滤波器的系数的装置 算法; 用于改变数据采样定时的装置; 用于估计采样频率偏移以便导出最佳定时的装置; 用于使用所接收的数据样本的统计信号来以符号率同步信号重采样的装置; 用于评估均衡器系数的简档的装置; 以及用于跟踪载波频率偏移的装置。

公开(公告)号：US07257102B2

公开(公告)日：2007-08-14

申请号：US10114800

申请日：2002-04-02

申请人： Jonathan S. Min ,  Nabil R. Yousef

发明人： Jonathan S. Min ,  Nabil R. Yousef

IPC分类号： H04J3/00 ,  H04B1/713 ,  H04H7/30 ,  H04H7/40 ,  H04L27/06

CPC分类号： H04N21/20 ,  H04L27/38 ,  H04L2027/0046 ,  H04L2027/0065 ,  H04L2027/0095 ,  H04N7/17336 ,  H04N21/4622 ,  H04N21/4782

摘要： Carrier frequency offset (CFO) estimation from preamble symbols. Any communication receiver may be adapted to perform the CFO estimation. The CFO estimation is performed using a low complexity, high accuracy CFO estimation method. The operation may be described as follows: each element of a received sequence is divided by the corresponding preamble element, the resulting sequence is divided into N subgroups, and each subgroup is then averaged. The phase differential of the resulting sequence is computed, averaged, and used to compute an estimate of the carrier frequency offset. This approach to performing CFO estimation is of relatively high estimation accuracy and of relatively low computational complexity.

摘要翻译： 来自前导符号的载波频率偏移（CFO）估计。 任何通信接收机可以适于执行CFO估计。 使用低复杂度，高精度的CFO估计方法来执行CFO估计。 该操作可以描述如下：接收到的序列的每个元素被相应的前导码元素划分，所得到的序列被划分成N个子组，然后对每个子组进行平均。 对所得到的序列的相位差进行计算，平均，并用于计算载波频率偏移的估计。 执行CFO估计的这种方法具有相对高的估计精度和相对低的计算复杂度。

公开(公告)号：US07346104B2

公开(公告)日：2008-03-18

申请号：US10829909

申请日：2004-04-21

申请人： Hee-Jung Yu ,  Ji-Hoon Choi ,  Yong-Hoon Lee

发明人： Hee-Jung Yu ,  Ji-Hoon Choi ,  Yong-Hoon Lee

IPC分类号： H04H7/40

CPC分类号： H04L25/03057 ,  H04B7/04 ,  H04L2025/03611

摘要： Disclosed is an adaptive receiving MIMO (multi input and multi output) system and method which decides a symbol detecting order so as to estimate the symbol having the minimum summation of weights of least square errors at the time of estimating the symbol for respective equalizers provided in parallel by the number of transmit antennas, and updates filter tap coefficients based on the RLS algorithm according to the detecting orders. Therefore, the filter tap coefficients are directly updated without tracking channels in the time-varying channel environment, and accordingly, detection performance very similar to those of the channel tracking and conventional V-BLAST scheme is provided with reduced complexity.

摘要翻译： 公开了一种自适应接收MIMO（多输入和多输出）系统和方法，该系统和方法确定符号检测顺序，以估计在估计各个均衡器的符号时具有最小二乘误差权重的最小求和的符号 根据发射天线的数量并行，并根据检测顺序更新基于RLS算法的滤波器抽头系数。 因此，在时变信道环境中直接更新滤波器抽头系数而不跟踪信道，因此提供了与信道跟踪和常规V-BLAST方案非常相似的检测性能，降低了复杂度。

公开(公告)号：US07224726B2

公开(公告)日：2007-05-29

申请号：US10109496

申请日：2002-03-28

申请人： Randall Perlow ,  Charles Brooks ,  Steven Jaffe ,  Tianmin Liu

发明人： Randall Perlow ,  Charles Brooks ,  Steven Jaffe ,  Tianmin Liu

IPC分类号： H04H7/40

CPC分类号： H04L25/0224 ,  H04L27/0008 ,  H04L2025/03503

摘要： An adaptive receiver is disclosed for optimally receiving and processing signals. The receiver utilizes one or more memory blocks to store groups of incoming symbols. The groups of symbols are processed by a channel estimation subsystem to determine channel characteristics. The receiver determines the appropriate demodulation and decoding strategy to implement based on the determined channel characteristics. The receiver includes a plurality of demodulation and decoding schemes, one of which is selected based on the results of a channel estimation analysis.

摘要翻译： 公开了用于最佳地接收和处理信号的自适应接收机。 接收机利用一个或多个存储器块来存储输入符号组。 符号组由信道估计子系统处理以确定信道特性。 接收机根据确定的信道特性确定适当的解调和解码策略来实现。 接收机包括多个解调和解码方案，其中之一是基于信道估计分析的结果来选择的。

公开(公告)号：US07251271B1

公开(公告)日：2007-07-31

申请号：US09655755

申请日：2000-09-06

申请人： Anders Eriksson

发明人： Anders Eriksson

IPC分类号： H04H7/40

CPC分类号： H03H17/0213 ,  H03H17/0294

摘要： Method and apparatus for designing digital filters are provided. One method includes the steps of determining a real-valued discrete-frequency representation of a desired digital filter and transforming this discrete-frequency representation into a corresponding discrete-time representation. The discrete-time representation is circularly shifted and a window is applied to the discrete time representation to produce a zero-padded reduced length filter. Thereafter input signal x[n] is convolved with the reduced length filter.

摘要翻译： 提供了设计数字滤波器的方法和装置。 一种方法包括以下步骤：确定所需数字滤波器的实值离散频率表示，并将该离散频率表示变换成对应的离散时间表示。 离散时间表示是循环移位的，并且将窗口应用于离散时间表示以产生零填充缩减长度滤波器。 此后，输入信号x [n]与缩小的长度滤波器进行卷积。

公开(公告)号：US06928111B2

公开(公告)日：2005-08-09

申请号：US09941792

申请日：2001-08-30

申请人： Ki-Bum Kim

发明人： Ki-Bum Kim

IPC分类号： H04N7/015 ,  H04L25/03 ,  H04L27/00 ,  H04N5/21 ,  H03H7/30 ,  H04H7/40 ,  H04K5/159

CPC分类号： H04N5/211 ,  H04L2025/03382 ,  H04L2025/0377 ,  H04L2025/03796 ,  H04L2027/0095

摘要： An equalizer is controlled using a sync signal in a digital vestigial sideband system is provided, in which the sync signal is accurately separated even though a ghost having a short delay time and a large size is generated. A switching unit is provided between a matched filter and the equalizer, which selects one of two input signals according to rejection filter on/off control signals and separates a data segment sync signal and a data field sync signal from the selected input signal. A control signal is produced via the separated sync signal to control the equalizer to operate in one of a blind mode and a training sequence mode. Since the equalizer performs sync signal separation by using the ghost removed signal, a system initial operational time becomes shorter, and accurate sync signal separation is possible even if severe ghosts occur, to thereby improve degeneration of system performance greatly.

摘要翻译： 使用数字残留边带系统中的同步信号来控制均衡器，其中即使产生具有短延迟时间和大尺寸的重影，同步信号被精确地分离。 开关单元设置在匹配滤波器和均衡器之间，该均衡器根据抑制滤波器开/关控制信号选择两个输入信号中的一个，并从所选择的输入信号中分离数据段同步信号和数据场同步信号。 通过分离的同步信号产生控制信号，以控制均衡器以盲模式和训练序列模式中的一种操作。 由于均衡器通过使用重影去除信号执行同步信号分离，所以系统初始操作时间变短，并且即使发生严重的重影也能够精确地进行同步信号分离，从而大大提高系统性能的退化。