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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
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。
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公开(公告)号：US20090086841A1
公开(公告)日：2009-04-02
申请号：US11904813
申请日：2007-09-28
IPC分类号： H04L27/28
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 convert a unsynchronized 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，傅立叶变换单元将通过多个天线的未同步接收转换为频域。 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。
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3.发明授权公开(公告)号：US09515687B2
公开(公告)日：2016-12-06
申请号：US13995694
申请日：2011-11-18
CPC分类号： H04B1/10 , H04L1/005 , H04L25/022 , H04L25/03159 , H04L25/03821 , H04L27/2647
摘要： Apparatus and methods are described to perform inter carrier interference (ICI) reduction or cancellation in an orthogonal frequency domain multiplexing (OFDM) receiver. A first and a second stage of ICI cancellation may be performed before inputting an estimated transmitted data carrier for forward error correction. Forward error correction may include a signal re-correction and reconstruction of the estimated transmitted data carrier prior to a further stage of ICI cancellation.
摘要翻译： 描述了在正交频域复用（OFDM）接收机中执行载波间干扰（ICI）减少或消除的装置和方法。 可以在输入用于前向纠错的估计的发送数据载体之前执行ICI取消的第一和第二阶段。 前向纠错可以包括在ICI取消的进一步阶段之前的估计的传输数据载体的信号重新校正和重构。
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公开(公告)号：US08879676B2
公开(公告)日：2014-11-04
申请号：US13286776
申请日：2011-11-01
CPC分类号： H04L25/0212 , H04L25/022
摘要： According to various embodiments, apparatus and methods disclosed herein may be implemented in a digital communication (wired or wireless) receiver, and relate to minimizing noise in an estimated channel frequency response at the receiver for the purposes of channel equalization. The disclosed apparatus and methods may include determining a channel impulse response based on an estimated channel frequency response. The estimated channel frequency response, the channel impulse response, or both may include noise. An impulse response mask may be determined based on the channel impulse response, and further applied to the channel impulse response to obtain a noise-reduced channel impulse response, which may be Fourier transformed to obtain a noise-reduced channel frequency response.
摘要翻译： 根据各种实施例，本文公开的装置和方法可以在数字通信（有线或无线）接收机中实现，并且涉及为了信道均衡的目的，在接收机处估计的信道频率响应中的噪声最小化。 所公开的装置和方法可以包括基于估计的信道频率响应来确定信道脉冲响应。 估计的信道频率响应，信道脉冲响应或二者可以包括噪声。 可以基于信道脉冲响应来确定脉冲响应掩码，并且进一步应用于信道脉冲响应以获得噪声降低的信道脉冲响应，其可被傅立叶变换以获得噪声降低的信道频率响应。
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5.发明申请APPARATUS AND METHOD FOR IMPROVING OFDM RECEIVER PERFORMANCE IN THE PRESENCE OF NARROWBAND INTERFERERS 有权用于改善窄带干扰器存在的OFDM接收机性能的装置和方法公开(公告)号：US20140064419A1
公开(公告)日：2014-03-06
申请号：US13596993
申请日：2012-08-28
IPC分类号： H04B1/12
CPC分类号： H04L27/265 , H04L27/2657 , H04L27/2688 , H04L27/2691
摘要： In an Orthogonal Frequency Division Multiplex (“OFDM”) system, the problem of an interferer reducing the signal-to-noise ratio of a signal can be mitigated by generating an interferer-correction signal and subtracting it from the signal to be processed. The amplitude, frequency and phase of the interferences are determined first. The frequency is estimated by averaging the squared-magnitude of multiple FFTs of the incoming signal and then locating the spectral peaks. The phase and amplitude may be estimated from this FFT outputs or through a process of correlation in the time domain. The interferer-correction signal is generated from the estimated amplitude, frequency, and phase. The correction to be subtracted from the main signal in order to reduce the effect of the interference may be generated in the time or frequency domain. The subtraction of the correction may also be implemented in the time or frequency domains.
摘要翻译： 在正交频分复用（“OFDM”）系统中，可以通过产生干扰校正信号并从要处理的信号中减去干扰源来减少信号的信噪比的问题。 首先确定干扰的幅度，频率和相位。 通过对输入信号的多个FFT的平方幅度进行平均，然后定位频谱峰值来估计频率。 可以从该FFT输出或通过时域中的相关过程来估计相位和幅度。 从估计的幅度，频率和相位产生干扰校正信号。 可以在时域或频域中产生要从主信号中减去以减少干扰的影响的校正。 校正的减法也可以在时域或频域中实现。
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6.发明申请公开(公告)号：US20130272460A1
公开(公告)日：2013-10-17
申请号：US13995694
申请日：2011-11-18
IPC分类号： H04B1/10
CPC分类号： H04B1/10 , H04L1/005 , H04L25/022 , H04L25/03159 , H04L25/03821 , H04L27/2647
摘要： Apparatus and methods are described to perform inter carrier interference (ICI) reduction or cancellation in an orthogonal frequency domain multiplexing (OFDM) receiver. A first and a second stage of ICI cancellation may be performed before inputting an estimated transmitted data carrier for forward error correction. Forward error correction may include a signal re-correction and reconstruction of the estimated transmitted data carrier prior to a further stage of ICI cancellation.
摘要翻译： 描述了在正交频域复用（OFDM）接收机中执行载波间干扰（ICI）减少或消除的装置和方法。 可以在输入用于前向纠错的估计的发送数据载体之前执行ICI取消的第一和第二阶段。 前向纠错可以包括在ICI取消的进一步阶段之前的估计的传输数据载体的信号重新校正和重构。
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7.发明授权Methods and systems to resolve cyclic ambiguity of a channel impulse response 有权解决信道脉冲响应的循环模糊度的方法和系统公开(公告)号：US08406343B2
公开(公告)日：2013-03-26
申请号：US12868366
申请日：2010-08-25
申请人： Thushara Hewavithana , Bernard Arambepola , Parveen K. Shukla , Sahan S. Gamage , Vinesh Bhunjun
发明人： Thushara Hewavithana , Bernard Arambepola , Parveen K. Shukla , Sahan S. Gamage , Vinesh Bhunjun
CPC分类号： H04L25/022 , H04L25/0212 , H04L25/0228 , H04L27/2647
摘要： Methods and systems to resolve cyclic ambiguity of a scattered-pilot based channel impulse response as a function of transmission parameter signalling (TPS), such as in a single frequency network, including to zero-pad a first orientation of the channel impulse response to an interval of an effective symbol duration of the multi-carrier signal, compute a channel frequency response from the zero-padded first orientation of the channel impulse response, and correlate components of the channel frequency response corresponding to frequencies of TPS carriers with raw channel frequency response data of obtained from the TPS carriers. Frequency response components of multiple zero-padded orientations of the channel impulse response may be correlated with the raw TPS carrier data to identify an optimum orientation of the channel impulse response. Frequency response components of subsequent zero-padded orientations may be iteratively computed from components of preceding orientations.
摘要翻译： 解决作为传输参数信令（TPS）的函数的基于分散导频的信道脉冲响应的循环模糊度的方法和系统，诸如在单个频率网络中，包括将信道脉冲响应的第一定向零填补到 多载波信号的有效符号持续时间的间隔，从信道脉冲响应的零填充的第一取向计算信道频率响应，并且将与TPS载波的频率相对应的信道频率响应的分量与原始信道频率响应相关联 从TPS载体获得的数据。 信道脉冲响应的多个零填充取向的频率响应分量可以与原始TPS载波数据相关，以识别信道脉冲响应的最佳取向。 随后的零填充取向的频率响应分量可以从先前方向的分量迭代计算。
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8.发明申请公开(公告)号：US20120051471A1
公开(公告)日：2012-03-01
申请号：US12868366
申请日：2010-08-25
申请人： Thushara Hewavithana , Bernard Arambepola , Parveen K. Shukla , Sahan S. Gamage , Vinesh Bhunjun
发明人： Thushara Hewavithana , Bernard Arambepola , Parveen K. Shukla , Sahan S. Gamage , Vinesh Bhunjun
IPC分类号： H04L27/06
CPC分类号： H04L25/022 , H04L25/0212 , H04L25/0228 , H04L27/2647
摘要： Methods and systems to resolve cyclic ambiguity of a scattered-pilot based channel impulse response as a function of transmission parameter signalling (TPS), such as in a single frequency network, including to zero-pad a first orientation of the channel impulse response to an interval of an effective symbol duration of the multi-carrier signal, compute a channel frequency response from the zero-padded first orientation of the channel impulse response, and correlate components of the channel frequency response corresponding to frequencies of TPS carriers with raw channel frequency response data of obtained from the TPS carriers. Frequency response components of multiple zero-padded orientations of the channel impulse response may be correlated with the raw TPS carrier data to identify an optimum orientation of the channel impulse response. Frequency response components of subsequent zero-padded orientations may be iteratively computed from components of preceding orientations.
摘要翻译： 解决作为传输参数信令（TPS）的函数的基于分散导频的信道脉冲响应的循环模糊度的方法和系统，诸如在单个频率网络中，包括将信道脉冲响应的第一定向零填补到 多载波信号的有效符号持续时间的间隔，从信道脉冲响应的零填充的第一取向计算信道频率响应，并且将与TPS载波的频率相对应的信道频率响应的分量与原始信道频率响应相关联 从TPS载体获得的数据。 信道脉冲响应的多个零填充取向的频率响应分量可以与原始TPS载波数据相关，以识别信道脉冲响应的最佳取向。 随后的零填充取向的频率响应分量可以从先前方向的分量迭代计算。
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公开(公告)号：US07970068B2
公开(公告)日：2011-06-28
申请号：US11986897
申请日：2007-11-27
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析模糊度的掩码。 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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公开(公告)号：US20150139351A1
公开(公告)日：2015-05-21
申请号：US14081586
申请日：2013-11-15
CPC分类号： H04L27/2627 , G06F7/768 , G06F12/00 , H03M13/271 , H04L1/0071 , H04L27/2628 , H04L27/263 , H04L27/2634
摘要： The disclosure generally relates to a method and apparatus for frequency interleaving. Specifically, an embodiment of the disclosure relates to a communication system having one or more antennas, a radio, a memory circuit, and a processor circuit. The antennas can be used to communicate signals or to comply with different transmission protocols. The radio can be configured to send and receive radio signals. The memory can communicate with the processor circuit and contain instructions for the processor circuit to write data carriers along a plurality of rows and columns of a 2-D store in bit-reversed order and read the columns of 2-D store.
摘要翻译： 本公开一般涉及用于频率交织的方法和装置。 具体地，本公开的实施例涉及具有一个或多个天线，无线电，存储器电路和处理器电路的通信系统。 天线可用于传送信号或符合不同的传输协议。 收音机可以配置为发送和接收无线电信号。 存储器可以与处理器电路进行通信，并且包含用于处理器电路的指令，以比特反转顺序沿着2D存储的多个行和列写入数据载体，并读取2-D存储的列。
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