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1. 发明授权

US09515687B2 Inter carrier interference cancellation for orthogonal frequency domain multiplexing receivers 有权
标题翻译：正交频域复用接收机的载波间干扰消除
公开(公告)号：US09515687B2
公开(公告)日：2016-12-06
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： H04L27/26 , H04B1/10 , H04L1/00 , H04L25/02 , H04L25/03
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。

2. 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。

3. 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。

4. 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。

5. 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。

6. 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。

7. 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。

8. 发明申请

US20150139351A1 METHOD AND APPARATUS FOR FREQUENCY INTERLEAVING 有权
标题翻译：用于频率交互的方法和装置
公开(公告)号：US20150139351A1
公开(公告)日：2015-05-21
申请号：US14081586
申请日：2013-11-15
申请人： Bernard Arambepola , Parveen K. Shukla , Thushara Hewavithana , Sahan S. Gamage
发明人： Bernard Arambepola , Parveen K. Shukla , Thushara Hewavithana , Sahan S. Gamage
IPC分类号： H04B7/12 , H04L27/26
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。

9. 发明申请

US20140169188A1 SYSTEMS AND METHODS FOR IMPLEMENTING PEAK-TO-AVERAGE POWER RATIO REDUCTION FOR OFDMA MODULATION 有权
标题翻译：用于实施OFDMA调制的峰值平均功率比减少的系统和方法
公开(公告)号：US20140169188A1
公开(公告)日：2014-06-19
申请号：US13716534
申请日：2012-12-17
申请人： Bernard Arambepola , Parveen Shukla , Thushara Hewavithana , Sahan Gamage
发明人： Bernard Arambepola , Parveen Shukla , Thushara Hewavithana , Sahan Gamage
IPC分类号： H04B7/04
CPC分类号： H04L27/2614 , H04L5/0044
摘要： A system and method are provided for implementing a peak-to-average power ratio (PAPR) reduction scheme for Orthogonal Frequency-Division Multiple Access (OFDMA) modulation. A unique PAPR reduction scheme for OFDMA modulation for systems operated according to a DOCSIS standard achieves results similar to those attributable to tone reservation schemes in a manner that does not negatively affect an amount of available data capacity, particularly in implementations with limited numbers of subcarriers. The disclosed systems and methods are particularly adaptable to next generation cable gateways and/or next generation cable modems. These next generation cable gateways and/or cable modems may find particular utility in advanced hybrid fiber/coaxial cable systems. The adaptable cable gateways/modems may include a cable gateway system-on-chip (SOC) configuration. The disclosed schemes may be applicable to OFDM modulation. For OFDM, however, the known tone reservation algorithms also may be employed.
摘要翻译：提供了一种用于实现正交频分多址（OFDMA）调制的峰均功率比（PAPR）降低方案的系统和方法。用于根据DOCSIS标准操作的系统的OFDMA调制的独特的PAPR降低方案实现了类似于对于音调预留方案的结果的结果，其结果不会不利地影响可用数据容量的数量，特别是在具有有限数目的子载波的实现中。所公开的系统和方法特别适用于下一代电缆网关和/或下一代电缆调制解调器。这些下一代电缆网关和/或电缆调制解调器可以在先进的混合光纤/同轴电缆系统中发现特定的用途。可适应性的电缆网关/调制解调器可以包括电缆网关片上系统（SOC）配置。所公开的方案可以适用于OFDM调制。然而，对于OFDM，也可以采用已知的音调预留算法。

10. 发明申请

US20140119420A1 METHODS AND SYSTEMS TO MITIGATE IMPULSE INTERFERENCE 有权
标题翻译：缓解干扰的方法和系统
公开(公告)号：US20140119420A1
公开(公告)日：2014-05-01
申请号：US13661817
申请日：2012-10-26
申请人： Thushara Hewavithana , Bernard Arambepola , Sahan Gamage
发明人： Thushara Hewavithana , Bernard Arambepola , Sahan Gamage
IPC分类号： H04B15/00 , H04B17/00
CPC分类号： H04L27/38 , H04L25/067 , H04L27/2649
摘要： Methods and systems to mitigate impulse interference in an OFDM QAM signal. A per-symbol noise measure, or quality measure (QM) is computed for a symbol k as a MSE of distances between carriers in the symbol and points of corresponding QAM constellations. MSE(k) is averaged over multiple symbols to compute a background signal QM, AVG_MSE(k). If MSE(k) exceeds AVG_MSE(k) by a moderate amount, symbol k may be moderately affected by impulse interference, and per-carrier SNR estimates are downgraded for all data carriers in symbol k, prior to LLR computation. SNR downgrading may be linear or step-wise based on an extent to which MSE(k) exceeds AVG_MSE(k). If MSE(k) exceeds AVG_MSE(k) by a significant amount, symbol k may be significantly affected by impulse interference, and LLRs may be set to indicate that all data carriers are erased in symbol k.
摘要翻译：减少OFDM QAM信号脉冲干扰的方法和系统。针对符号k计算每符号噪声测量或质量测量（QM），作为符号中的载波与相应QAM星座的点之间的距离的MSE。 MSE（k）在多个符号之间进行平均以计算背景信号QM，AVG_MSE（k）。如果MSE（k）超过AVG_MSE（k）中等量，则符号k可能受脉冲干扰的适度影响，并且在LLR计算之前，符号k中的所有数据载波的每载波SNR估计被降级。基于MSE（k）超过AVG_MSE（k）的程度，SNR降级可以是线性的或逐步的。如果MSE（k）超过AVG_MSE（k）大量，则符号k可能受脉冲干扰的显着影响，并且可以将LLR设置为指示所有数据载体在符号k中被擦除。

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