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公开(公告)号：US08340221B1
公开(公告)日：2012-12-25
申请号：US12609294
申请日：2009-10-30
申请人： Hao-ren Cheng , Chih-yuan Chu , Justin Huang
发明人： Hao-ren Cheng , Chih-yuan Chu , Justin Huang
IPC分类号： H03K9/00
CPC分类号： H04L27/2659 , H04L27/2675 , H04L27/2695
摘要： Scattered pilots are used to estimate the integer frequency offset and OFDM symbol index simultaneously. A cross-correlation between IFFT outputs of received samples with different spectral shift and OFDM symbol index is used to identify the channel impulse response. Upon determination of the channel impulse, the estimated integer frequency offset and OFDM symbol index can then be determined.
摘要翻译： 散射导频用于同时估计整数频率偏移和OFDM符号索引。 使用具有不同频谱偏移和OFDM符号索引的接收样本的IFFT输出之间的互相关来识别信道脉冲响应。 在确定信道脉冲之后，可以确定估计的整数频率偏移和OFDM符号索引。
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公开(公告)号：US08340234B1
公开(公告)日：2012-12-25
申请号：US12496040
申请日：2009-07-01
申请人： Hao-ren Cheng , Chih-yuan Chu
发明人： Hao-ren Cheng , Chih-yuan Chu
CPC分类号： H04L25/0212 , H04L25/022 , H04L27/2665 , H04L27/2688 , H04L27/2695
摘要： This disclosure is directed to systems and methods for positioning a FFT window using the noise power that is related to ISI By selecting a FFT window position that minimizes the noise power, ISI is reduced or eliminated The techniques can be used in coherent and non-coherent systems Further, noise associated with the Doppler effect is compensated for, allowing the use of these system and methods in time-varying environments, such as mobile applications.
摘要翻译： 本公开涉及用于使用与ISI相关的噪声功率来定位FFT窗口的系统和方法。通过选择最小化噪声功率，减少或消除ISI的FFT窗口位置。该技术可用于相干和非相干 系统此外，补偿与多普勒效应相关的噪声，允许在诸如移动应用的时变环境中使用这些系统和方法。
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