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1.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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3.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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4.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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5.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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6.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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8.发明授权Apparatus and method for improving OFDM receiver performance in the presence of narrowband interferers 有权在存在窄带干扰的情况下改善OFDM接收机性能的装置和方法公开(公告)号：US09106497B2
公开(公告)日：2015-08-11
申请号：US13596993
申请日：2012-08-28
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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9.发明授权Orthogonal frequency division multiplex (OFDM) demodulator with improved cyclic ambiguity resolution 有权具有改进的循环模糊度分辨率的正交频分复用（OFDM）解调器公开(公告)号：US08938015B2
公开(公告)日：2015-01-20
申请号：US13997706
申请日：2012-03-15
CPC分类号： H04L27/22 , H04L25/03159 , H04L27/01 , H04L27/26 , H04L27/2665 , H04L27/2672 , H04L27/2675 , H04L27/2679 , H04L27/2695
摘要： A system according to one embodiment includes a demodulator configured to receive an OFDM modulated signal over a channel, the signal including a sequence of symbols, each of the symbols including one or more pilot carriers and one or more data carriers; a time filtering and interpolation circuit coupled to the demodulator, the time filtering and interpolation circuit configured to estimate the frequency response of the channel based on time filtering and interpolation of the pilot carriers; a phase slope correction circuit configured to apply each of a plurality of phase slope corrections to the frequency response and to the data carriers; a frequency filtering and interpolation circuit configured to calculate frequency response estimates of the channel at data carrier frequencies based on frequency filtering and interpolation of the phase slope corrected frequency response; an equalization circuit configured to equalize the phase slope corrected data carriers based on the calculated frequency response estimates; an error calculation circuit configure to calculate the mean square error between the equalized data carriers and a nearest QAM constellation point; and an iterative phase slope optimization circuit configured to select the phase slope correction associated with the minimum of the mean square errors, wherein the selected phase slope resolves the cyclic ambiguity.
摘要翻译： 根据一个实施例的系统包括：解调器，被配置为通过信道接收OFDM调制信号，所述信号包括符号序列，每个符号包括一个或多个导频载波和一个或多个数据载波; 耦合到解调器的时间滤波和内插电路，所述时间滤波和内插电路被配置为基于导频载波的时间滤波和内插来估计信道的频率响应; 相位斜率校正电路，被配置为对频率响应和数据载波施加多个相位斜率校正中的每一个; 频率滤波和内插电路，被配置为基于频率滤波和相位斜率校正频率响应的内插来计算数据载波频率处的信道的频率响应估计; 均衡电路，被配置为基于所计算的频率响应估计来均衡相位斜率校正数据载波; 误差计算电路，用于计算均衡数据载波与最近的QAM星座点之间的均方误差; 以及迭代相位斜率优化电路，被配置为选择与所述均方误差的最小值相关联的相位斜率校正，其中所选择的相位斜率解决所述循环模糊度。
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公开(公告)号：US08897412B2
公开(公告)日：2014-11-25
申请号：US13714530
申请日：2012-12-14
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。
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