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。

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。

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。

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。

公开(公告)号：US20130107996A1

公开(公告)日：2013-05-02

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： H04B1/10 ,  H03D1/04

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。

公开(公告)号：US08457256B2

公开(公告)日：2013-06-04

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： H03D1/00

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。

公开(公告)号：US08204156B2

公开(公告)日：2012-06-19

申请号：US12317970

申请日：2008-12-31

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： H04L27/00 ,  H03D3/22

CPC分类号： H04L27/3827 ,  H04L27/2273 ,  H04L2027/003 ,  H04L2027/0036 ,  H04L2027/0038 ,  H04L2027/0057 ,  H04L2027/0067 ,  H04L2027/0069

摘要： Apparatuses, systems, and methods that employ conditional probabilities to calculate phase errors are disclosed. For a received signal, the embodiments may develop several phase error estimates relative to each point of a constellation, the number and location of points of the constellation depending on the modulation technique of the received signal. In addition to calculating the phase error estimates, the embodiments may also calculate weights, or probabilities, associated with each of the estimates. The embodiments may use the estimates and the weights to calculate a composite phase error estimate. The composite phase error estimate may be used to correct the received signal and eliminate or reduce the impact of the phase error.

摘要翻译： 公开了使用条件概率来计算相位误差的装置，系统和方法。 对于接收到的信号，实施例可以根据接收信号的调制技术，相对于星座的每个点，星座的点的数量和位置来形成几个相位误差估计。 除了计算相位误差估计之外，实施例还可以计算与每个估计相关联的权重或概率。 实施例可以使用估计和权重来计算复合相位误差估计。 复合相位误差估计可以用于校正接收到的信号，并消除或减少相位误差的影响。

公开(公告)号：US20100169734A1

公开(公告)日：2010-07-01

申请号：US12346350

申请日：2008-12-30

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： H03M13/05 ,  G06F11/10

CPC分类号： H04L1/005 ,  H03M13/1105 ,  H03M13/6325 ,  H03M13/658 ,  H04L1/0057

摘要： Embodiments of a broadcast receiver and method for optimizing a scale factor in a log-likelihood ratio (LLR) mapper are generally described herein. In some embodiments, the broadcast receiver includes an LLR mapper to generate LLRs from demodulated data samples, a low-density parity-check (LDPC) decoder to generate decoded data from the LLRs, and an LLR optimizer to dynamically select a scale factor for the LLR mapper based on a number of iterations for convergence of the LDPC decoder. In some embodiments, the LLR optimizer iteratively revises the scale factor during receipt of broadcast signals until the number of iterations of the iterative decoder is either minimized for convergence or minimized for convergence failures.

摘要翻译： 广播接收机的实施例和用于优化对数似然比（LLR）映射器中的比例因子的方法在本文中通常被描述。 在一些实施例中，广播接收机包括用于从解调的数据样本生成LLR的LLR映射器，用于从LLR生成解码数据的低密度奇偶校验（LDPC）解码器，以及LLR优化器，以动态地选择用于 基于用于LDPC解码器的收敛的迭代次数的LLR映射器。 在一些实施例中，LLR优化器在接收广播信号期间迭代地修改比例因子，直到迭代解码器的迭代次数为了收敛最小化或者对于收敛失败最小化。

公开(公告)号：US20100166115A1

公开(公告)日：2010-07-01

申请号：US12317970

申请日：2008-12-31

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： H04L27/22 ,  H04L27/00

CPC分类号： H04L27/3827 ,  H04L27/2273 ,  H04L2027/003 ,  H04L2027/0036 ,  H04L2027/0038 ,  H04L2027/0057 ,  H04L2027/0067 ,  H04L2027/0069

摘要： Apparatuses, systems, and methods that employ conditional probabilities to calculate phase errors are disclosed. For a received signal, the embodiments may develop several phase error estimates relative to each point of a constellation, the number and location of points of the constellation depending on the modulation technique of the received signal. In addition to calculating the phase error estimates, the embodiments may also calculate weights, or probabilities, associated with each of the estimates. The embodiments may use the estimates and the weights to calculate a composite phase error estimate. The composite phase error estimate may be used to correct the received signal and eliminate or reduce the impact of the phase error.

摘要翻译： 公开了使用条件概率来计算相位误差的装置，系统和方法。 对于接收到的信号，实施例可以根据接收信号的调制技术，相对于星座的每个点，星座的点的数量和位置来形成几个相位误差估计。 除了计算相位误差估计之外，实施例还可以计算与每个估计相关联的权重或概率。 实施例可以使用估计和权重来计算复合相位误差估计。 复合相位误差估计可以用于校正接收到的信号，并消除或减少相位误差的影响。

公开(公告)号：US08611407B2

公开(公告)日：2013-12-17

申请号：US13286326

申请日：2011-11-01

申请人： Bernard Arambepola ,  Thushara Hewavithana ,  Sahan S. Gamage ,  Parveen K. Shukla

发明人： Bernard Arambepola ,  Thushara Hewavithana ,  Sahan S. Gamage ,  Parveen K. Shukla

IPC分类号： H04B3/46

CPC分类号： H04L27/066 ,  H04L2027/0044 ,  H04L2027/0067

摘要： According to various embodiments, apparatus and methods disclosed herein include computing phase error of a received signal based on an estimate of a first component (e.g., in-phase component) of a transmitted signal and an analytic representation of the estimate of the first component of the transmitted signal. The analytic representation of the estimate of the first component of the transmitted signal may represent an estimate of a second component (e.g., quadrature phase component) of the transmitted signal. The analytic representation of the estimated first component may be computed using at least one of a Hilbert transform or Fourier transform on the estimated first component of the transmitted signal.

摘要翻译： 根据各种实施例，本文公开的装置和方法包括基于发射信号的第一分量（例如，同相分量）的估计和第一分量的估计的分析表示来计算接收信号的相位误差 发送信号。 发射信号的第一分量的估计的分析表示可以表示发射信号的第二分量（例如，正交相位分量）的估计。 估计的第一分量的分析表示可以使用发射信号的估计的第一分量上的希尔伯特变换或傅里叶变换中的至少一个来计算。