公开(公告)号：US20090274200A1

公开(公告)日：2009-11-05

申请号：US12115394

申请日：2008-05-05

Applicant: Muhammad Zubair Ikram ,  Seok-Jun Lee ,  Murtaza Ali

Inventor： Muhammad Zubair Ikram ,  Seok-Jun Lee ,  Murtaza Ali

IPC: H04B1/38 ,  H04L27/06

CPC classification number: H04L25/0232 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0048 ,  H04L5/0064 ,  H04L25/0204 ,  H04L25/0212

Abstract: A system and method for time domain interpolation of signals for channel estimation. A method for computing channel estimates comprises storing symbols in a buffer, using time domain interpolation (TDI) for a first time to compute channel estimates for a set of sub-carriers of a symbol. The channel estimates are computed from the symbol and a first number of required symbols in the buffer. The method also comprises using TDI for a second time to compute channel estimates for the set of sub-carriers of a symbol. The channel estimates are computed from the symbol, a second number of required symbols in the buffer, and a buffered symbol used as a missing required symbol if the missing required symbol is not in the buffer.

Abstract translation: 用于信道估计的信号的时域插值的系统和方法。 一种用于计算信道估计的方法包括：使用时域内插（TDI）首先在缓冲器中存储符号以计算符号的一组子载波的信道估计。 信道估计是根据符号和缓冲器中的第一数目的所需符号来计算的。 该方法还包括使用TDI第二次来计算符号的子载波集合的信道估计。 如果缺少的所需符号不在缓冲区中，则从符号计算信道估计值，缓冲器中必需符号的第二个数量以及用作缺失的所需符号的缓冲符号。

公开(公告)号：US08374285B2

公开(公告)日：2013-02-12

申请号：US12115394

申请日：2008-05-05

Applicant: Muhammad Zubair Ikram ,  Seok-Jun Lee ,  Murtaza Ali

Inventor： Muhammad Zubair Ikram ,  Seok-Jun Lee ,  Murtaza Ali

IPC: H03K9/00 ,  H04L27/06

CPC classification number: H04L25/0232 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0048 ,  H04L5/0064 ,  H04L25/0204 ,  H04L25/0212

Abstract: A system and method for time domain interpolation of signals for channel estimation. A method for computing channel estimates comprises storing symbols in a buffer, using time domain interpolation (TDI) for a first time to compute channel estimates for a set of sub-carriers of a symbol. The channel estimates are computed from the symbol and a first number of required symbols in the buffer. The method also comprises using TDI for a second time to compute channel estimates for the set of sub-carriers of a symbol. The channel estimates are computed from the symbol, a second number of required symbols in the buffer, and a buffered symbol used as a missing required symbol if the missing required symbol is not in the buffer.

Abstract translation: 用于信道估计的信号的时域插值的系统和方法。 一种用于计算信道估计的方法包括：使用时域内插（TDI）首先在缓冲器中存储符号以计算符号的一组子载波的信道估计。 信道估计是根据符号和缓冲器中的第一数目的所需符号来计算的。 该方法还包括使用TDI第二次来计算符号的子载波集合的信道估计。 如果缺少的所需符号不在缓冲区中，则从符号计算信道估计值，缓冲器中必需符号的第二个数量以及用作缺失的所需符号的缓冲符号。

公开(公告)号：US20090175234A1

公开(公告)日：2009-07-09

申请号：US12350523

申请日：2009-01-08

Applicant: Udayan Dasgupta ,  Muhammad Zubair Ikram ,  David Patrick Magee

Inventor： Udayan Dasgupta ,  Muhammad Zubair Ikram ,  David Patrick Magee

IPC: H04W72/04 ,  H04B7/00

CPC classification number: H04L27/2602 ,  H04B7/2656 ,  H04L5/005 ,  H04L27/2613

Abstract: A method of performing wireless communications. The method comprises, at a transmitting station, encoding a plurality of symbols into a frame. The method further comprises, from the transmitting station, transmitting the frame via a wireless communication to a receiving station. The frame comprises a plurality of sub-frames, wherein a first sub-frame in the plurality of sub-frames consists of a first number of symbols and a second sub-frame in the plurality of sub-frames consists of a second number of symbols. Finally, the first number differs from the second number.

Abstract translation: 一种执行无线通信的方法。 该方法包括在发送站将多个符号编码成帧。 该方法还包括从发送站经由无线通信将帧发送到接收站。 所述帧包括多个子帧，其中所述多个子帧中的第一子帧由所述多个子帧中的第一数量的符号和第二子帧组成，所述第二子帧由第二数量的符号 。 最后，第一个数字与第二个数字不同。

公开(公告)号：US08787591B2

公开(公告)日：2014-07-22

申请号：US12880059

申请日：2010-09-10

Applicant: Devangi Nikunj Parikh ,  Muhammad Zubair Ikram

Inventor： Devangi Nikunj Parikh ,  Muhammad Zubair Ikram

IPC: H04B15/00 ,  G10L21/00

CPC classification number: G10L21/0208 ,  G10L21/0272 ,  H04M1/60

Abstract: A method of interference suppression is provided that includes receiving a first audio signal from a first audio capture device and a second audio signal from a second audio capture device wherein the first audio signal includes a first combination of desired audio content and interference and the second audio signal includes a second combination of the desired audio content and the interference, performing blind source separation using the first audio signal and the second audio signal to generate an output interference signal and an output audio signal including the desired audio content with the interference suppressed, estimating interference remaining in the output audio signal using the output interference signal, and subtracting the estimated interference from the output audio signal to generate a final output audio signal with the interference further suppressed.

Abstract translation: 提供了一种干扰抑制的方法，其包括从第一音频捕获装置接收第一音频信号和从第二音频捕获装置接收第二音频信号，其中第一音频信号包括期望的音频内容和干扰的第一组合以及第二音频 信号包括所需音频内容和干扰的第二组合，使用第一音频信号和第二音频信号执行盲源分离，以产生输出干扰信号和输出音频信号，所述输出干扰信号包括所抑制的干扰所需的音频内容，估计 使用输出干扰信号留在输出音频信号中的干扰，以及从输出音频信号中减去所估计的干扰，以产生进一步抑制干扰的最终输出音频信号。

公开(公告)号：US07321564B2

公开(公告)日：2008-01-22

申请号：US10765009

申请日：2004-01-26

Applicant: Muhammad Zubair Ikram ,  Srinath Hosur ,  Michael O. Polley ,  Manish Goel

Inventor： Muhammad Zubair Ikram ,  Srinath Hosur ,  Michael O. Polley ,  Manish Goel

IPC: H04J1/16

CPC classification number: H04B7/02 ,  H04B1/7105 ,  H04B1/7107 ,  H04L1/0631 ,  H04L1/0656 ,  H04L27/2647

Abstract: A Hybrid IMMSE-LMMSE receiver processing technique predicts performance of and selects between iterative and non-iterative decoding of symbols based on an intelligent metric. Based on a pre-specified criterion, the receiver determines if a correct first-stage decision is made or not. If a correct decision is made, then it follows iterative processing like in BLAST. Alternatively, if a wrong decision is found to have occurred, the receiver resorts to LMMSE estimation processing.

Abstract translation: 混合IMMSE-LMMSE接收机处理技术基于智能度量预测符号的迭代和非迭代解码之间的性能并进行选择。 根据预先指定的标准，接收机确定是否做出正确的第一阶段决定。 如果做出正确的决定，那么它将像BLAST一样进行迭代处理。 或者，如果发现错误的决定已经发生，接收机将采用LMMSE估计处理。

公开(公告)号：US08880394B2

公开(公告)日：2014-11-04

申请号：US13589250

申请日：2012-08-20

Applicant: Devangi Nikunj Parikh ,  Muhammad Zubair Ikram ,  Takahiro Unno

Inventor： Devangi Nikunj Parikh ,  Muhammad Zubair Ikram ,  Takahiro Unno

IPC: G10L21/02 ,  G10L21/0216 ,  G10L21/0208

CPC classification number: G10L21/0216 ,  G10L21/0208 ,  G10L2021/02161

Abstract: In response to a first envelope within a kth frequency band of a first channel, a speech level within the kth frequency band of the first channel is estimated. In response to a second envelope within the kth frequency band of a second channel, a noise level within the kth frequency band of the second channel is estimated. A noise suppression gain for a time frame n is computed in response to the estimated speech level for a preceding time frame, the estimated noise level for the preceding time frame, the estimated speech level for the time frame n, and the estimated noise level for the time frame n. An output channel is generated in response to multiplying the noise suppression gain for the time frame n and the first channel.

Abstract translation: 响应于第一信道的第k个频带内的第一包络，估计第一信道的第k个频带内的语音电平。 响应于第二信道的第k个频带内的第二包络，估计第二信道的第k个频带内的噪声电平。 响应于先前时间帧的估计语音电平，前一时间帧的估计噪声电平，时间帧n的估计语音电平和估计的时间帧n的噪声电平计算时间帧n的噪声抑制增益 时间框架n。 响应于将时帧n和第一通道的噪声抑制增益相乘而产生输出通道。

公开(公告)号：US08340278B2

公开(公告)日：2012-12-25

申请号：US12900143

申请日：2010-10-07

Applicant: Baboo Vikrhamsingh Gowreesunker ,  Takahiro Unno ,  Muhammad Zubair Ikram

Inventor： Baboo Vikrhamsingh Gowreesunker ,  Takahiro Unno ,  Muhammad Zubair Ikram

IPC: H04M9/08

CPC classification number: H04B3/23

Abstract: A method and apparatus for cross-talk resistant adaptive noise cancellation. The method includes retrieving, via the processor, a primary signal and a reference signal, filtering the primary signal utilizing a filter H12(z) and estimating a cross-talk, filtering the reference signal utilizing a filter H21(z) and estimating the noise leakage of the reference signal, determining the difference between the noise leakage estimate from the primary signal and estimating a first post-filtering, determining the difference between the cross-talk estimate and the reference signal and estimating a second post-filtering, determining if the voice activity is detected in the primary signal, adapting filters H12 and H21 by de-correlation if the voice activity is detected, and adapting filter H12 by NLMS if the voice activity is not detected, limiting maximum filter change during different conditions for protecting filters H12 and H21 from diverging, maintaining filter stability by tracking absolute sum of the coefficients of the convolution of H12 and H21, obtaining a primary output and a reference output utilizing the first post-filtering and the second post-filtering, and utilizing the primary output and the reference output for cross-talk resistant adaptive noise cancellation.

Abstract translation: 一种抗串扰自适应噪声消除的方法和装置。 该方法包括通过处理器检索主信号和参考信号，利用滤波器​​H12（z）对主信号进行滤波并估计串扰，利用滤波器​​H21（z）对参考信号进行滤波并估计噪声 参考信号的泄漏，确定来自主信号的噪声泄漏估计之间的差异和估计第一后置滤波，确定串扰估计与参考信号之间的差异，并估计第二后置滤波，确定是否 在主信号中检测到语音活动，如果检测到语音活动，则通过去相关来适配滤波器H12和H21，并且如果没有检测到语音活动，则通过NLMS适配滤波器H12，限制在保护滤波器H12的不同条件期间的最大滤波器改变 和H21，通过跟踪H12和H21的卷积的系数的绝对和来保持滤波器的稳定性，获得初级 输出和使用第一后置滤波和第二后置滤波的参考输出，并且利用主输出和参考输出用于抗串扰抗性自适应噪声消除。

公开(公告)号：US20110064242A1

公开(公告)日：2011-03-17

申请号：US12880059

申请日：2010-09-10

Applicant: Devangi Nikunj Parikh ,  Muhammad Zubair Ikram

Inventor： Devangi Nikunj Parikh ,  Muhammad Zubair Ikram

IPC: H04B15/00

CPC classification number: G10L21/0208 ,  G10L21/0272 ,  H04M1/60

Abstract: A method of interference suppression is provided that includes receiving a first audio signal from a first audio capture device and a second audio signal from a second audio capture device wherein the first audio signal includes a first combination of desired audio content and interference and the second audio signal includes a second combination of the desired audio content and the interference, performing blind source separation using the first audio signal and the second audio signal to generate an output interference signal and an output audio signal including the desired audio content with the interference suppressed, estimating interference remaining in the output audio signal using the output interference signal, and subtracting the estimated interference from the output audio signal to generate a final output audio signal with the interference further suppressed.

Abstract translation: 提供了一种干扰抑制的方法，其包括从第一音频捕获装置接收第一音频信号和从第二音频捕获装置接收第二音频信号，其中第一音频信号包括期望的音频内容和干扰的第一组合以及第二音频 信号包括所需音频内容和干扰的第二组合，使用第一音频信号和第二音频信号执行盲源分离，以产生输出干扰信号和输出音频信号，所述输出干扰信号包括所抑制的干扰所需的音频内容，估计 使用输出干扰信号留在输出音频信号中的干扰，以及从输出音频信号中减去所估计的干扰，以产生进一步抑制干扰的最终输出音频信号。

公开(公告)号：US20130046535A1

公开(公告)日：2013-02-21

申请号：US13589250

申请日：2012-08-20

Applicant: Devangi Nikunj Parikh ,  Muhammad Zubair Ikram ,  Takahiro Unno

Inventor： Devangi Nikunj Parikh ,  Muhammad Zubair Ikram ,  Takahiro Unno

IPC: G10L21/02

CPC classification number: G10L21/0216 ,  G10L21/0208 ,  G10L2021/02161

Abstract: In response to a first envelope within a kth frequency band of a first channel, a speech level within the kth frequency band of the first channel is estimated. In response to a second envelope within the kth frequency band of a second channel, a noise level within the kth frequency band of the second channel is estimated. A noise suppression gain for a time frame n is computed in response to the estimated speech level for a preceding time frame, the estimated noise level for the preceding time frame, the estimated speech level for the time frame n, and the estimated noise level for the time frame n. An output channel is generated in response to multiplying the noise suppression gain for the time frame n and the first channel.

Abstract translation: 响应于第一信道的第k个频带内的第一包络，估计第一信道的第k个频带内的语音电平。 响应于第二信道的第k个频带内的第二包络，估计第二信道的第k个频带内的噪声电平。 响应于先前时间帧的估计语音电平，前一时间帧的估计噪声电平，时间帧n的估计语音电平以及用于时间帧n的估计噪声电平计算时间帧n的噪声抑制增益 时间框架n。 响应于将时帧n和第一通道的噪声抑制增益相乘而产生输出通道。

公开(公告)号：US20110123019A1

公开(公告)日：2011-05-26

申请号：US12900143

申请日：2010-10-07

Applicant: Baboo Vikrhamsingh Gowreesunker ,  Takahiro Unno ,  Muhammad Zubair Ikram

Inventor： Baboo Vikrhamsingh Gowreesunker ,  Takahiro Unno ,  Muhammad Zubair Ikram

IPC: H04M9/08

CPC classification number: H04B3/23

Abstract: A method and apparatus for cross-talk resistant adaptive noise cancellation. The method includes retrieving, via the processor, a primary signal and a reference signal, filtering the primary signal utilizing a filter H12(z) and estimating a cross-talk, filtering the reference signal utilizing a filter H21(z) and estimating the noise leakage of the reference signal, determining the difference between the noise leakage estimate from the primary signal and estimating a first post-filtering, determining the difference between the cross-talk estimate and the reference signal and estimating a second post-filtering, determining if the voice activity is detected in the primary signal, adapting filters H12 and H21 by de-correlation if the voice activity is detected, and adapting filter H12 by NLMS if the voice activity is not detected, limiting maximum filter change during different conditions for protecting filters H12 and H21 from diverging, maintaining filter stability by tracking absolute sum of the coefficients of the convolution of H12 and H21, obtaining a primary output and a reference output utilizing the first post-filtering and the second post-filtering, and utilizing the primary output and the reference output for cross-talk resistant adaptive noise cancellation.

Abstract translation: 一种抗串扰自适应噪声消除的方法和装置。 该方法包括通过处理器检索主信号和参考信号，利用滤波器​​H12（z）对主信号进行滤波并估计串扰，利用滤波器​​H21（z）对参考信号进行滤波并估计噪声 参考信号的泄漏，确定来自主信号的噪声泄漏估计之间的差异和估计第一后置滤波，确定串扰估计与参考信号之间的差异，并估计第二后置滤波，确定是否 在主信号中检测到语音活动，如果检测到语音活动，则通过去相关来适配滤波器H12和H21，并且如果没有检测到语音活动，则通过NLMS适配滤波器H12，限制在保护滤波器H12的不同条件期间的最大滤波器改变 和H21，通过跟踪H12和H21的卷积的系数的绝对和来保持滤波器的稳定性，获得初级 输出和使用第一后置滤波和第二后置滤波的参考输出，并且利用主输出和参考输出用于抗串扰抗性自适应噪声消除。