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21. 发明授权

US08879676B2 Channel response noise reduction at digital receivers 有权
标题翻译：数字接收机的信道响应降噪
公开(公告)号：US08879676B2
公开(公告)日：2014-11-04
申请号：US13286776
申请日：2011-11-01
申请人： Thushara Hewavithana , Bernard Arambepola , Parveen K. Shukla , Sahan S. Gamage
发明人： Thushara Hewavithana , Bernard Arambepola , Parveen K. Shukla , Sahan S. Gamage
IPC分类号： H04L25/08 , H04L25/02
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。

22. 发明授权

US08743977B2 Efficient tuning and demodulation techniques 失效
标题翻译：高效的调谐和解调技术
公开(公告)号：US08743977B2
公开(公告)日：2014-06-03
申请号：US12456894
申请日：2009-06-23
申请人： Bernard Arambepola , Nick Cowley
发明人： Bernard Arambepola , Nick Cowley
IPC分类号： H04K1/10
CPC分类号： H04N5/4401 , H04L7/0029 , H04L25/05 , H04N5/455 , H04N21/4383
摘要： Techniques for the reception and processing of wireless signals are disclosed. For instance, an apparatus may include a first hardware module (e.g., a mixed signal module) and a second hardware module (e.g., a digital signal module). The first hardware module may convert an analog signal corresponding to a received wireless signal into a digital signal having a first sampling rate. In turn, channel filtering may be performed on this digital signal. Following this, the filtered digital signal may be resampled from the first sampling rate to a second sampling rate. At this point, the resampled signal may be transferred across an interface from the first hardware module to the second hardware module. Upon receipt, the second hardware module may correct a sampling rate error in the second sampling rate, and demodulate the digital signal into one or more symbols.
摘要翻译：公开了接收和处理无线信号的技术。例如，设备可以包括第一硬件模块（例如，混合信号模块）和第二硬件模块（例如，数字信号模块）。第一硬件模块可以将对应于接收到的无线信号的模拟信号转换为具有第一采样率的数字信号。反过来，可以对该数字信号执行信道滤波。之后，滤波后的数字信号可以从第一采样率重采样到第二采样率。此时，重新采样的信号可以跨接口从第一硬件模块传送到第二硬件模块。在接收时，第二硬件模块可以校正第二采样率中的采样率误差，并将数字信号解调成一个或多个符号。

23. 发明申请

US20140064419A1 APPARATUS AND METHOD FOR IMPROVING OFDM RECEIVER PERFORMANCE IN THE PRESENCE OF NARROWBAND INTERFERERS 有权
标题翻译：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
申请人： Bernard Arambepola , Thushara Hewavithana
发明人： Bernard Arambepola , Thushara Hewavithana
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。

24. 发明申请

US20130272460A1 INTER CARRIER INTERFERENCE CANCELLATION FOR ORTHOGONAL FREQUENCY DOMAIN MULTIPLEXING RECEIVERS 有权
标题翻译：正交频域多路复用接收机的双载波干扰消除
公开(公告)号：US20130272460A1
公开(公告)日：2013-10-17
申请号：US13995694
申请日：2011-11-18
申请人： Thushara Hewavithana , Parveen K. Shukla , Bernard Arambepola
发明人： Thushara Hewavithana , Parveen K. Shukla , Bernard Arambepola
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。

25. 发明授权

US08406343B2 Methods and systems to resolve cyclic ambiguity of a channel impulse response 有权
标题翻译：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
IPC分类号： H04L27/26 , 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。

26. 发明申请

US20120051471A1 METHODS AND SYSTEMS TO RESOLVE CYCLIC AMBIGUITY OF A CHANNEL IMPULSE RESPONSE 有权
标题翻译：解决通道冲动响应循环利用的方法和系统
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。

27. 发明授权

US07970068B2 Mobile channel estimation for DBV-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：US07970068B2
公开(公告)日：2011-06-28
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： H04K1/10 , H04L27/28
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。

28. 发明申请

US20100322326A1 Efficient tuning and demodulation techniques 失效
标题翻译：高效的调谐和解调技术
公开(公告)号：US20100322326A1
公开(公告)日：2010-12-23
申请号：US12456894
申请日：2009-06-23
申请人： Bernard Arambepola , Nick Cowley
发明人： Bernard Arambepola , Nick Cowley
IPC分类号： H04K1/10 , H03M1/00 , H03M1/12
CPC分类号： H04N5/4401 , H04L7/0029 , H04L25/05 , H04N5/455 , H04N21/4383
摘要： Techniques for the reception and processing of wireless signals are disclosed. For instance, an apparatus may include a first hardware module (e.g., a mixed signal module) and a second hardware module (e.g., a digital signal module). The first hardware module may convert an analog signal corresponding to a received wireless signal into a digital signal having a first sampling rate. In turn, channel filtering may be performed on this digital signal. Following this, the filtered digital signal may be resampled from the first sampling rate to a second sampling rate. At this point, the resampled signal may be transferred across an interface from the first hardware module to the second hardware module. Upon receipt, the second hardware module may correct a sampling rate error in the second sampling rate, and demodulate the digital signal into one or more symbols.
摘要翻译：公开了接收和处理无线信号的技术。例如，设备可以包括第一硬件模块（例如，混合信号模块）和第二硬件模块（例如，数字信号模块）。第一硬件模块可以将对应于接收到的无线信号的模拟信号转换为具有第一采样率的数字信号。反过来，可以对该数字信号执行信道滤波。之后，滤波后的数字信号可以从第一采样率重采样到第二采样率。此时，重新采样的信号可以跨接口从第一硬件模块传送到第二硬件模块。在接收时，第二硬件模块可以校正第二采样率中的采样率误差，并将数字信号解调成一个或多个符号。

29. 发明授权

US07668260B2 Method of and apparatus for detecting impulsive noise, method of operating a demodulator, demodulator and radio receiver 失效
标题翻译：用于检测脉冲噪声的方法和装置，操作解调器，解调器和无线电接收器的方法
公开(公告)号：US07668260B2
公开(公告)日：2010-02-23
申请号：US11545960
申请日：2006-10-10
申请人： Bernard Arambepola
发明人： Bernard Arambepola
IPC分类号： H03K9/00 , H04L27/00 , H04L27/06
CPC分类号： H04B1/1036 , H03G3/345 , H04B1/1027 , H04L27/2647 , H04L27/2657 , H04L27/2662
摘要： In a digital receiver for receiving COFDM modulated television signals or the like, consecutive samples are compared with a detection threshold and the number of samples having amplitudes greater than the threshold is determined. This is compared with a further threshold and, if the number of such samples exceeds the further threshold, affected samples are blanked to zero. Similarly, an automatic gain control loop is disabled when the samples are blanked. A demodulator forms the difference in phase of pilot carriers from symbol to symbol. If the variance of the phase differences exceeds an averaged value, this indicates the presence of impulsive noise and is used to inhibit signal correction techniques within the demodulator. Noise energy is thus reduced and propagation of effects resulting from impulsive noise from symbol to symbol is substantially reduced.
摘要翻译：在用于接收COFDM调制电视信号等的数字接收机中，将连续采样与检测阈值进行比较，并且确定具有大于阈值的幅度的采样数。将其与另一阈值进行比较，并且如果这些样本的数量超过另外的阈值，则将受影响的样本置为零。类似地，当样品被消隐时，禁用自动增益控制环路。解调器形成导频载波从符号到符号的相位差。如果相位差的方差超过平均值，则表示脉冲噪声的存在，并用于抑制解调器内的信号校正技术。因此噪声能量减少，并且由脉冲噪声从符号到符号的影响的传播显着减少。

30. 发明申请

US20090097600A1 DIVERSITY RECEIVER AND METHOD FOR CONTROLLING POWER THEREOF 有权
标题翻译：多样性接收机及其功率控制方法
公开(公告)号：US20090097600A1
公开(公告)日：2009-04-16
申请号：US11870028
申请日：2007-10-10
申请人： Bernard Arambepola , Nick Cowley
发明人： Bernard Arambepola , Nick Cowley
IPC分类号： H04L1/02
CPC分类号： H04L1/02 , H04B7/0857 , H04B7/0868 , H04B7/0877
摘要： The present disclosure provides a diversity receiver. The diversity receiver includes a plurality of tuners, a plurality of demodulators operatively coupled to the plurality of tuners and a controller operatively coupled to the plurality of demodulators and the plurality of tuners. Each tuner is capable of receiving a modulated signal from a path of a plurality of distinct paths. The controller determines information for each path and computes a ratio of signal strength to an additive noise for each path based on determined information. Further, the controller adjusts power of signal in each path based on comparison of computed ratio of signal strength to additive noise with a predetermined threshold. The diversity receiver also includes a MRC circuitry operatively coupled to the plurality of demodulators and configured to combine the signal of each path for obtaining a resultant combined signal having an improved ratio of signal strength to additive noise.
摘要翻译：本公开提供了一种分集接收机。分集接收机包括多个调谐器，可操作地耦合到多个调谐器的多个解调器和可操作地耦合到多个解调器和多个调谐器的控制器。每个调谐器能够从多个不同路径的路径接收调制信号。控制器确定每个路径的信息，并且基于确定的信息计算每个路径的信号强度与加性噪声的比率。此外，控制器基于计算的信号强度与加性噪声的比率与预定阈值的比较来调整每个路径中的信号功率。分集接收机还包括可操作地耦合到多个解调器并且被配置为组合每个路径的信号以获得具有改善的信号强度与加性噪声比的合成信号的MRC电路。

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