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71. 发明授权

US08885775B2 Dynamic optimization of carrier recovery performance for communication systems 有权
标题翻译：通信系统载波恢复性能的动态优化
公开(公告)号：US08885775B2
公开(公告)日：2014-11-11
申请号：US13976337
申请日：2012-02-28
申请人： Thushara Hewavithana , Bernard Arambepola
发明人： Thushara Hewavithana , Bernard Arambepola
IPC分类号： H03D3/18 , H03D3/24 , H04L27/227 , H04L7/04 , H03L7/08 , H04L7/033
CPC分类号： H04L7/0331 , H03L7/08 , H03L7/0807 , H03L7/093 , H04L7/04 , H04L27/2271
摘要： Apparatuses, systems, and methods are directed to maintaining optimal carrier tracking performance in view of operating conditions that prevail. Such configurations employ a phase lock loop that configured to generate an estimated phase error value, a variance module configured to calculate a phase noise variance based on the estimated phase error value, and a loop control bandwidth module that calculates a loop bandwidth value based on a detected lower phase noise variance, generates modified loop filter values in accordance with the calculated loop bandwidth value, and updates the phase lock loop with the modified loop filter values. During subsequent iterations, the modified loop filter values are incrementally adjusted along a particular direction until the phase noise variance increases at which point the modified loop filter values are incrementally adjusted in an opposite direction to converge on an optimal loop bandwidth value.
摘要翻译：设备，系统和方法旨在根据现行的运行条件来维持最佳的载波跟踪性能。这样的配置采用配置成产生估计的相位误差值的相位锁定环路，配置成基于估计的相位误差值来计算相位噪声方差的方差模块，以及环路控制带宽模块，该环路控制带宽模块基于检测到较低的相位噪声方差，根据计算出的环路带宽值产生修正的环路滤波器值，并用修改的环路滤波器值更新锁相环。在随后的迭代中，修改的环路滤波器值沿着特定方向被递增地调整，直到相位噪声方差增加，在该点，修改的环路滤波器值在相反方向上递增地调整以收敛于最佳环路带宽值。

72. 发明授权

US08842750B2 Channel estimation for DVB-T2 demodulation using an adaptive prediction technique 有权
标题翻译：使用自适应预测技术的DVB-T2解调的信道估计
公开(公告)号：US08842750B2
公开(公告)日：2014-09-23
申请号：US12974582
申请日：2010-12-21
申请人： Parveen K. Shukla , Bernard Arambepola , Thushara Hewavithana , Sahan S. Gamage
发明人： Parveen K. Shukla , Bernard Arambepola , Thushara Hewavithana , Sahan S. Gamage
IPC分类号： H04L27/28 , H04L25/02 , H04L27/26
CPC分类号： H04L25/022 , H04L25/0226 , H04L25/0232 , H04L25/025 , H04L27/2647
摘要： According to various embodiments, a method is disclosed that includes receiving an orthogonal frequency-division multiplexing (OFDM) modulated signal at a modulator; filtering the received modulated signal using a plurality of sets of filter coefficients with a linear predictor algorithm; and estimating a channel frequency response based on the filtering.
摘要翻译：根据各种实施例，公开了一种在调制器处接收正交频分复用（OFDM）调制信号的方法; 使用具有线性预测器算法的多组滤波器系数对所接收的调制信号进行滤波; 以及基于所述滤波来估计信道频率响应。

73. 发明申请

US20140169434A1 METHOD AND APPARATUS FOR PHASE NOISE MITIGATION 有权
标题翻译：相位噪声减轻的方法和装置
公开(公告)号：US20140169434A1
公开(公告)日：2014-06-19
申请号：US13714530
申请日：2012-12-14
申请人： Thushara Hewavithana , Bernard Arambepola
发明人： Thushara Hewavithana , Bernard Arambepola
IPC分类号： H04L27/01
CPC分类号： H04L27/01 , H04L27/2647 , H04L27/3836 , H04L2027/0038 , H04L2027/0087
摘要： An approach is provided to mitigate phase noise by correcting common phase error and inter-carrier-interference in a received signal. The approach involves determining a received signal includes phase noise comprising at least a common phase error component and an inter-carrier-interference component. The approach also involves causing the common phase error to be corrected based on one or more pilot carriers. The approach further involves causing an estimate of a main signal component to be subtracted from the one or more pilot carriers. The approach additionally involves determining a sequence of estimated coefficients of a multiplicative phase noise sequence. The approach also involves causing the inter-carrier-inference to be corrected by processing the multiplicative phase noise sequence using the sequence of estimated coefficients. The approach further involves causing an equalized data signal to be output based on the corrected common phase error and the corrected inter-carrier-interference.
摘要翻译：提供了一种通过校正接收信号中的公共相位误差和载波间干扰来减轻相位噪声的方法。该方法包括确定接收信号包括至少包括公共相位误差分量和载波间干扰分量的相位噪声。该方法还涉及基于一个或多个导频载波来校正公共相位误差。该方法还包括导致从一个或多个导频载波减去主信号分量的估计。该方法还涉及确定乘法相位噪声序列的估计系数序列。该方法还涉及通过使用估计系数的序列处理乘法相位噪声序列来使得载波间推理被校正。该方法进一步包括使得基于校正的公共相位误差和校正的载波间干扰来输出均衡的数据信号。

74. 发明授权

US08351862B2 Device, system, and method of mitigating interference to digital television signals 失效
标题翻译：降低数字电视信号干扰的装置，系统和方法
公开(公告)号：US08351862B2
公开(公告)日：2013-01-08
申请号：US11968168
申请日：2008-01-01
申请人： Ernest T. Tsui , Nick Cowley , Bernard Arambepola
发明人： Ernest T. Tsui , Nick Cowley , Bernard Arambepola
IPC分类号： H04B1/00
CPC分类号： H04B7/0857 , H04N21/414
摘要： Device, system, and method of mitigating interference to digital television signals. For example, an apparatus includes a diversity-based digital television receiver having a filter controller and at least first and second channel paths, wherein the first channel path includes a first Global System for Mobile communication (GSM) reject filter, the second channel path includes a second GSM reject filter, the second channel path is parallel to the first channel path, and the filter controller is to selectively switch an operational state of the first GSM reject filter.
摘要翻译：降低数字电视信号干扰的装置，系统和方法。例如，一种装置包括具有滤波器控制器和至少第一和第二信道路径的基于分集的数字电视接收机，其中第一信道路径包括第一全球移动通信系统（GSM）拒绝滤波器，第二信道路径包括第二GSM拒绝滤波器，第二信道路径平行于第一信道路径，并且滤波器控制器选择性地切换第一GSM拒绝滤波器的工作状态。

75. 发明申请

US20120051469A1 CHANNEL-ADAPTIVE LIKELIHOOD DETERMINATION 失效
标题翻译：频道自适应确定
公开(公告)号：US20120051469A1
公开(公告)日：2012-03-01
申请号：US12862951
申请日：2010-08-25
申请人： Sahan S. Gamage , Bernard Arambepola , Thushara Hewavithana , Parveen K. Shukla , Vinesh Bhunjun
发明人： Sahan S. Gamage , Bernard Arambepola , Thushara Hewavithana , Parveen K. Shukla , Vinesh Bhunjun
IPC分类号： H04L27/06
CPC分类号： H04L25/067
摘要： Methods and systems to compute likelihood measures of demodulated, complex-coordinate data points, to and dynamically scale the likelihood measures as a function of a channel statistic, and to decode the data points from the scaled likelihood measures. Likelihood measures may be computed relative to all points, or a subset of points of a reference constellation, such as a subset of one or more nearest constellation points. Likelihood measures may be scaled as a function of a channel frequency response variance amongst a plurality of carriers, such as carriers of an OFDM signal, and/or as a function of a channel impulse response variance.
摘要翻译：用于计算解调的复坐标数据点的似然度量的方法和系统，并将似然度量动态地缩放为通道统计量的函数，并且从经比例缩放的似然度量来解码数据点。可以相对于所有点或参考星座的点的子集（诸如一个或多个最近星座点的子集）计算似然度量。似然度量可以被缩放为多个载波之类的信道频率响应方差的函数，诸如OFDM信号的载波，和/或作为信道脉冲响应方差的函数。

76. 发明授权

US08085859B2 Platform noise mitigation 有权
标题翻译：平台噪音减轻
公开(公告)号：US08085859B2
公开(公告)日：2011-12-27
申请号：US11904813
申请日：2007-09-28
申请人： Yongfang Guo , Lei Shao , Ernest T. Tsui , Bernard Arambepola , Thushara Hewavithana , Xintian D. Lin
发明人： Yongfang Guo , Lei Shao , Ernest T. Tsui , Bernard Arambepola , Thushara Hewavithana , Xintian D. Lin
IPC分类号： H04K1/10 , H04L23/02
CPC分类号： H04L25/0242 , H04L27/2655 , H04L27/2659 , H04L27/266 , H04L27/2663 , H04L27/2665
摘要： In one embodiment of the invention, a Fourier transform unit converts unsynchronized data received through multiple antennas to a frequency domain. Also, a spectrum estimation unit determines a power spectrum for the unsynchronized data. A notch filter removes data within a frequency band from additional unsynchronized data based on the power spectrum. A synchronization unit synchronizes the notch filtered data and a noise estimation unit determines a noise covariance matrix between the synchronized data received from multiple antennas. In addition, an equalization unit performs channel equalization on the synchronized data based on the noise covariance matrix.
摘要翻译：在本发明的一个实施例中，傅里叶变换单元将通过多个天线接收的非同步数据转换为频域。此外，频谱估计单元确定用于非同步数据的功率谱。陷波滤波器基于功率谱从附加的非同步数据中去除频带内的数据。同步单元同步陷波滤波数据，并且噪声估计单元确定从多个天线接收的同步数据之间的噪声协方差矩阵。此外，均衡单元基于噪声协方差矩阵对同步数据执行信道均衡。

77. 发明授权

US08059687B2 Algorithm for managing data loss in software demodulators 有权
标题翻译：用于管理软件解调器中的数据丢失的算法
公开(公告)号：US08059687B2
公开(公告)日：2011-11-15
申请号：US12316876
申请日：2008-12-16
申请人： Bernard Arambepola , Tony Cole , Parveen Shukla , Thushara Hewavithana , Sahan Gamage
发明人： Bernard Arambepola , Tony Cole , Parveen Shukla , Thushara Hewavithana , Sahan Gamage
IPC分类号： H04J3/06
CPC分类号： H04N21/435 , H04H40/18 , H04L47/14 , H04L47/23 , H04L47/30 , H04L47/32 , H04L47/34 , H04L49/90 , H04N21/235 , H04N21/4382 , H04N21/442
摘要： Embodiments of methods for receiving and processing multi-band signals in wideband and narrowband environments are described herein. Other embodiments may be described and claimed.
摘要翻译：本文描述了用于在宽带和窄带环境中接收和处理多频带信号的方法的实施例。可以描述和要求保护其他实施例。

78. 发明申请

US20100166088A1 METHOD AND SYSTEM FOR OFDM SYMBOL TIMING RECOVERY 有权
标题翻译： OFDM符号时序恢复的方法和系统
公开(公告)号：US20100166088A1
公开(公告)日：2010-07-01
申请号：US12347598
申请日：2008-12-31
申请人： Bernard Arambepola , Parveen K. Shukla , Thushara Hewavithana
发明人： Bernard Arambepola , Parveen K. Shukla , Thushara Hewavithana
IPC分类号： H04J11/00 , H04L27/28 , H04B1/10
CPC分类号： H04L27/2691 , H04L25/0212 , H04L25/03057 , H04L27/2665 , H04L27/2695
摘要： A method and system for OFDM symbol timing recovery is described. A symbol timing recovery module of an OFDM receiver is configured to determine an optimum trigger point for performing a discrete Fourier transform in a manner that minimizes inter-symbol interference.
摘要翻译：描述了用于OFDM符号定时恢复的方法和系统。 OFDM接收机的符号定时恢复模块被配置为以使符号间干扰最小化的方式确定用于执行离散傅里叶变换的最佳触发点。

79. 发明申请

US20100158141A1 METHODS AND SYSTEMS TO ESTIMATE CHANNEL FREQUENCY RESPONSE IN MULTI-CARRIER SIGNALS 有权
标题翻译：估计多载波信号中频道响应的方法和系统
公开(公告)号：US20100158141A1
公开(公告)日：2010-06-24
申请号：US12339387
申请日：2008-12-19
申请人： Thushara Hewavithana , Bernard Arambepola , Parveen K. Shukla
发明人： Thushara Hewavithana , Bernard Arambepola , Parveen K. Shukla
IPC分类号： H04L27/28
CPC分类号： H04L25/022 , H04L5/0007 , H04L5/0048 , H04L25/0232
摘要： Methods and systems to determine channel frequency responses corresponding to multi-carrier signals, such as OFDM signals, including to filter or mask noise from channel frequency response estimates in a time domain.
摘要翻译：确定对应于诸如OFDM信号的多载波信号的信道频率响应的方法和系统，包括在时域中对来自信道频率响应估计的噪声进行滤波或掩蔽。

80. 发明申请

US20090135923A1 Mobile channel estimation for DVB-T COFDM demodulator 有权
标题翻译： DVB-T COFDM解调器的移动信道估计
公开(公告)号：US20090135923A1
公开(公告)日：2009-05-28
申请号：US11986897
申请日：2007-11-27
申请人： Bernard Arambepola , Thushara Hewavithana , Parveen K. Shukla
发明人： Bernard Arambepola , Thushara Hewavithana , Parveen K. Shukla
IPC分类号： H04L27/28 , H04L27/06
CPC分类号： H04L25/0212 , H04L5/0007 , H04L5/0048 , H04L25/0226 , H04L25/0232 , H04L27/2647
摘要： A channel estimator for use in a DVB-T system is capable of high Doppler performance without incurring restrictive delay spread limitations, in a hardware efficient manner. A first channel impulse response is generated that has ambiguity due to under-sampling in the frequency domain. A filter is then used to filter scattered pilots to generate a mask that is capable of resolving the ambiguities. In at least one approach, a finite impulse response filter is used during the mask generation process to generate a snapshot of the channel frequency response in non-real time. In another approach, an infinite impulse response filter is used during the mask generation process to generate a channel frequency response in real time.
摘要翻译：用于DVB-T系统的信道估计器能够以硬件有效的方式实现高多普勒性能而不产生限制性延迟扩展限制。产生第一信道脉冲响应，其由于频域中的欠采样而具有模糊性。然后使用滤波器来过滤散射导频以产生能够解决模糊度的掩码。在至少一种方法中，在掩模生成处理期间使用有限脉冲响应滤波器以非实时生成信道频率响应的快照。在另一种方法中，在掩模生成处理期间使用无限脉冲响应滤波器来实时生成信道频率响应。

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