公开(公告)号：US20090232230A1

公开(公告)日：2009-09-17

申请号：US12118063

申请日：2008-05-09

申请人： Kun-Chien HUNG ,  David W. Lin

发明人： Kun-Chien HUNG ,  David W. Lin

IPC分类号： H04L27/28 ,  H04B7/208

CPC分类号： H04L25/0232 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/022 ,  H04L25/0226 ,  H04L27/261 ,  H04L27/2647 ,  H04L27/2662

摘要： This invention discloses a method for OFDM and OFDMA channel estimation via phase-rotated polynomial interpolation and extrapolation (inter/extra-polation). For complexity reason, polynomial inter/extra-polation is an often considered method for channel estimation in orthogonal frequency-division multiplexing (OFDM) and orthogonal frequency-division multiple access (OFDMA) systems, in which the simplest choice is linear inter/extra-polation. But the performance of this method depends on the accuracy of symbol timing estimation as well as the channel delay spread. The invention mitigates the problem by adding a linear phase factor to polynomial inter/extra-polation, which corresponds to adding a delay (also called delay shift) in the time domain.

摘要翻译： 本发明公开了一种通过相位旋转多项式插值和外推（inter / extra-polation）进行OFDM和OFDMA信道估计的方法。 对于复杂性原因，多项式inter / extra-polation是在正交频分复用（OFDM）和正交频分多址（OFDMA）系统中经常考虑的信道估计方法，其中最简单的选择是线性互/ 政治化 但是该方法的性能取决于符号定时估计的精度以及信道延迟扩展。 本发明通过将线性相位因子添加到多项式inter / extra-polation来缓解问题，这对应于在时域中增加延迟（也称为延迟移位）。

公开(公告)号：US20080144745A1

公开(公告)日：2008-06-19

申请号：US11683523

申请日：2007-03-08

申请人： Kun-Chien Hung ,  David W. Lin ,  Jian-Pei Liu

发明人： Kun-Chien Hung ,  David W. Lin ,  Jian-Pei Liu

IPC分类号： H04L27/06

CPC分类号： H04L25/0224 ,  H04L27/261

摘要： A channel estimation device estimates channel by a previous signal, comprising an F evaluation module, a digitalization module, and a transferring module. The evaluation module processes a initial channel estimation according to at least one pilot signal of the previous signal. The digitalization module digitalizes a data carrier to a digital data signal according to the initial channel estimation. The transferring module transfers the digital data signal to at least one of specific references. The evaluation module receives a new data signal and modulates the new data signal according to the specific references.

摘要翻译： 信道估计装置通过前一信号估计信道，包括F评估模块，数字化模块和传送模块。 评估模块根据先前信号的至少一个导频信号处理初始信道估计。 数字化模块根据初始信道估计将数据载体数字化为数字数据信号。 转移模块将数字数据信号传送到具体参考中的至少一个。 评估模块接收新的数据信号并根据具体参考调制新的数据信号。

公开(公告)号：US08300713B2

公开(公告)日：2012-10-30

申请号：US12078616

申请日：2008-04-02

申请人： Kun-Chien Hung ,  David W. Lin

发明人： Kun-Chien Hung ,  David W. Lin

IPC分类号： H04K1/10

CPC分类号： H04L5/0007 ,  H04L27/0014 ,  H04L27/2659 ,  H04L27/2672 ,  H04L27/2675 ,  H04L27/2684

摘要： A preamble sequence detection and integral carrier frequency offset estimation method for OFDM/OFDMA wireless communication systems by formulating integral carrier frequency offset estimation and preamble sequence detection as a signal detection problem in multi-channel interference, obtaining the theoretically optimal solution, and deriving simplified, approximately optimal solutions, in which frequency-domain filtering is employed to calculate the required correlation values, which can drastically reduce the high computational complexity of the original theoretically optimal solution but result in little impact on precision. In addition, several further simplified algorithms are provided, some of which can even eliminate the use of multipliers. The using of frequency-domain filtering has high extensibility in application to related signal sequence detection problems.

摘要翻译： 一种用于OFDM / OFDMA无线通信系统的前导码序列检测和整体载波频率偏移估计方法，通过将多载波频偏估计和前导序列检测作为多信道干扰的信号检测问题，获得理论上的最优解， 近似最优解，其中采用频域滤波来计算所需的相关值，这可以显着降低原始理论上最优解的高计算复杂度，但对精度几乎没有影响。 此外，还提供了几个进一步简化的算法，其中一些甚至可以消除乘法器的使用。 使用频域滤波在应用于相关信号序列检测问题方面具有很高的可扩展性。

公开(公告)号：US08275079B2

公开(公告)日：2012-09-25

申请号：US12165080

申请日：2008-06-30

申请人： Kun-Chien Hung ,  David W. Lin ,  Youn-Tai Lee ,  Yi-Ting Lin

发明人： Kun-Chien Hung ,  David W. Lin ,  Youn-Tai Lee ,  Yi-Ting Lin

IPC分类号： H04B1/10

CPC分类号： H04L27/2647 ,  H04W56/0005

摘要： A communication apparatus, a method, and a tangible machine-readable medium thereof for processing ranging interference of an orthogonal frequency division multiplexing (OFDM) signal. The communication apparatus comprises a receiving unit, a processing unit, and a mask generating unit. The receiving unit receives the OFDM signal having a plurality of OFDM symbols. The processing unit estimates a delay value and an energy value of at least one ranging code according to the OFDM symbols. The mask generating unit generates a mask function according to the delay value and the energy value. Finally, the processing unit synthesizes the ranging interference in the OFDM signal and removes it according to the mask function.

摘要翻译： 一种用于处理正交频分复用（OFDM）信号的测距干扰的通信装置，方法和有形机器可读介质。 通信装置包括接收单元，处理单元和掩模生成单元。 接收单元接收具有多个OFDM符号的OFDM信号。 处理单元根据OFDM符号估计至少一个测距码的延迟值和能量值。 掩模生成单元根据延迟值和能量值生成掩模功能。 最后，处理单元合成OFDM信号中的测距干扰，并根据掩码函数去除它。

公开(公告)号：US08218658B2

公开(公告)日：2012-07-10

申请号：US12118063

申请日：2008-05-09

申请人： Kun-Chien Hung ,  David W. Lin

发明人： Kun-Chien Hung ,  David W. Lin

IPC分类号： H04L27/28

CPC分类号： H04L25/0232 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/022 ,  H04L25/0226 ,  H04L27/261 ,  H04L27/2647 ,  H04L27/2662

摘要： This invention discloses a method for OFDM and OFDMA channel estimation via phase-rotated polynomial interpolation and extrapolation (inter/extra-polation). For complexity reason, polynomial inter/extra-polation is an often considered method for channel estimation in orthogonal frequency-division multiplexing (OFDM) and orthogonal frequency-division multiple access (OFDMA) systems, in which the simplest choice is linear inter/extra-polation. But the performance of this method depends on the accuracy of symbol timing estimation as well as the channel delay spread. The invention mitigates the problem by adding a linear phase factor to polynomial inter/extra-polation, which corresponds to adding a delay (also called delay shift) in the time domain.

摘要翻译： 本发明公开了一种通过相位旋转多项式插值和外推（inter / extra-polation）进行OFDM和OFDMA信道估计的方法。 对于复杂性原因，多项式inter / extra-polation是在正交频分复用（OFDM）和正交频分多址（OFDMA）系统中经常考虑的信道估计方法，其中最简单的选择是线性互/ 政治化 但是该方法的性能取决于符号定时估计的精度以及信道延迟扩展。 本发明通过将线性相位因子添加到多项式inter / extra-polation来缓解问题，这对应于在时域中增加延迟（也称为延迟移位）。

公开(公告)号：US08139666B2

公开(公告)日：2012-03-20

申请号：US12576866

申请日：2009-10-09

申请人： Kun-Chien Hung ,  David W. Lin

发明人： Kun-Chien Hung ,  David W. Lin

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L25/0232 ,  H04B17/364 ,  H04L25/0212 ,  H04L25/022

摘要： The present invention relates to a channel estimation technique for multi-carrier system which uses pilot signal to first obtain pilot subcarrier channel responses, then estimate the mean delay and the root-mean-square delay spread of the channel, and then uses interpolation to obtain the channel responses of arbitrary subcarriers. The present invention is able to perform channel estimation and to accurately estimate various channel delay parameters (such as the initial delay, the mean delay, and the root-mean-square delay spread) with very low quantity of pilot signal and with low computational complexity. In addition, the present invention has broad applicability, as it does not require the channel power-delay profile to be of certain specific types and it can operate in systems where pilot subcarriers have an irregular configuration.

摘要翻译： 本发明涉及使用导频信号首先获得导频子载波信道响应的多载波系统的信道估计技术，然后估计信道的平均延迟和均方根延迟扩展，然后使用内插获得 任意子载波的信道响应。 本发明能够以非常低的导频信号量和低计算复杂度来执行信道估计并且准确地估计各种信道延迟参数（诸如初始延迟，平均延迟和均方根延迟扩展） 。 此外，本发明具有广泛的适用性，因为它不需要信道功率延迟分布具有某些特定类型，并且其可以在导频子载波具有不规则配置的系统中操作。

公开(公告)号：US20100260248A1

公开(公告)日：2010-10-14

申请号：US12576866

申请日：2009-10-09

申请人： Kun-Chien Hung ,  David W. Lin

发明人： Kun-Chien Hung ,  David W. Lin

IPC分类号： H04B17/00 ,  H04L27/28

CPC分类号： H04L25/0232 ,  H04B17/364 ,  H04L25/0212 ,  H04L25/022

摘要： The present invention relates to a channel estimation technique for multi-carrier system which uses pilot signal to first obtain pilot subcarrier channel responses, then estimate the mean delay and the root-mean-square delay spread of the channel, and then uses interpolation to obtain the channel responses of arbitrary subcarriers. The present invention is able to perform channel estimation and to accurately estimate various channel delay parameters (such as the initial delay, the mean delay, and the root-mean-square delay spread) with very low quantity of pilot signal and with low computational complexity. In addition, the present invention has broad applicability, as it does not require the channel power-delay profile to be of certain specific types and it can operate in systems where pilot subcarriers have an irregular configuration.

摘要翻译： 本发明涉及使用导频信号首先获得导频子载波信道响应的多载波系统的信道估计技术，然后估计信道的平均延迟和均方根延迟扩展，然后使用内插获得 任意子载波的信道响应。 本发明能够以非常低的导频信号量和低计算复杂度来执行信道估计并且准确地估计各种信道延迟参数（诸如初始延迟，平均延迟和均方根延迟扩展） 。 此外，本发明具有广泛的适用性，因为它不需要信道功率延迟分布具有某些特定类型，并且其可以在导频子载波具有不规则配置的系统中操作。

公开(公告)号：US20090067517A1

公开(公告)日：2009-03-12

申请号：US12078616

申请日：2008-04-02

申请人： Kun-Chien Hung ,  David W. Lin

发明人： Kun-Chien Hung ,  David W. Lin

IPC分类号： H04L27/28 ,  H03D1/00 ,  H04L27/06

CPC分类号： H04L5/0007 ,  H04L27/0014 ,  H04L27/2659 ,  H04L27/2672 ,  H04L27/2675 ,  H04L27/2684

摘要： In multi-cell OFDM/OFDMA wireless communication systems, any subscriber station (SS) or mobile station (MS) that intends to enter the system needs to establish time and frequency synchronization with the base station (BS) and obtain the identification code of the BS, where in frequency synchronization one usually needs to estimate the fractional carrier frequency offset (CFO) and the integral CFO. (“Fractional” and “integral” refer to, respectively, the fractional and the integral parts of the ratio of the CFO to subcarrier spacing.) The present invention assumes that the SS or MS first does timing and fractional CFO synchronization and then conducts integral CFO estimation and BS identity detection. The present invention considers integral CFO estimation and BS identity detection jointly, i.e., it proposes solutions that address these topics jointly. The present invention formulates the problem as a signal detection problem in multi-channel interference and obtains the theoretically optimal solution first, and then derives simplified, approximately optimal solutions, in which the present invention employs frequency-domain filtering to calculate the required correlation values which can drastically reduce the high computational complexity of the original theoretically optimal solution but results in little impact on precision. In addition, the present invention proposes several further simplified algorithms, some of which can even eliminate the use of multipliers. The above proposition of frequency-domain filtering has high extensibility in application to related signal sequence detection problems.

摘要翻译： 在多小区OFDM / OFDMA无线通信系统中，意图进入系统的任何用户台（SS）或移动台（MS）需要与基站（BS）建立时间和频率同步，并获得 BS，其中频率同步通常需要估计分数载波频率偏移（CFO）和积分CFO。 （“分数”和“积分”分别指CFO与子载波间隔的比例的分数和积分部分。）本发明假定SS或MS首先进行定时和分数CFO同步，然后进行积分 CFO估计和BS身份检测。 本发明综合考虑了整体CFO估计和BS身份检测，即提出了共同解决这些问题的解决方案。 本发明作为多信道干扰中的信号检测问题提出了问题，首先获得理论上最优解，然后得到简化的近似最优解，其中本发明采用频域滤波来计算所需的相关值， 可以显着降低原始理论上最优解的高计算复杂度，但对精度几乎没有影响。 此外，本发明提出了几种进一步简化的算法，其中一些甚至可以消除乘法器的使用。 频域滤波的上述命题在应用于相关信号序列检测问题方面具有很高的可扩展性。

公开(公告)号：US20090238291A1

公开(公告)日：2009-09-24

申请号：US12165080

申请日：2008-06-30

申请人： Kun-Chien Hung ,  David W. Lin ,  Youn-Tai Lee ,  Yi-Ting Lin

发明人： Kun-Chien Hung ,  David W. Lin ,  Youn-Tai Lee ,  Yi-Ting Lin

IPC分类号： H04L27/28

CPC分类号： H04L27/2647 ,  H04W56/0005

摘要： A communication apparatus, a method, and a tangible machine-readable medium thereof for processing ranging interference of an orthogonal frequency division multiplexing (OFDM) signal. The communication apparatus comprises a receiving unit, a processing unit, and a mask generating unit. The receiving unit receives the OFDM signal having a plurality of OFDM symbols. The processing unit estimates a delay value and an energy value of at least one ranging code according to the OFDM symbols. The mask generating unit generates a mask function according to the delay value and the energy value. Finally, the processing unit synthesizes the ranging interference in the OFDM signal and removes it according to the mask function.

摘要翻译： 一种用于处理正交频分复用（OFDM）信号的测距干扰的通信装置，方法和有形机器可读介质。 通信装置包括接收单元，处理单元和掩模生成单元。 接收单元接收具有多个OFDM符号的OFDM信号。 处理单元根据OFDM符号估计至少一个测距码的延迟值和能量值。 掩模生成单元根据延迟值和能量值生成掩模功能。 最后，处理单元合成OFDM信号中的测距干扰，并根据掩码函数去除它。

公开(公告)号：US08570918B2

公开(公告)日：2013-10-29

申请号：US13106681

申请日：2011-05-12

申请人： Hai-wei Wang ,  David W. Lin ,  Tzu-Hsien Sang

发明人： Hai-wei Wang ,  David W. Lin ,  Tzu-Hsien Sang

IPC分类号： H04L5/14 ,  H04B7/208 ,  H04J1/00

CPC分类号： H04L25/03821 ,  H04L25/03159 ,  H04L27/2647

摘要： A method for processing a frequency division multiplexing signal transmitted in a channel is provided. The method includes the steps of a) receiving the frequency division multiplexing signal having a residual intercarrier interference (ICI) and a channel noise and transmitted by plural subcarriers; b) performing a cyclic prefix removal and a discrete Fourier transform for the frequency division multiplexing signal to obtain a frequency-domain signal; c) analyzing the frequency-domain signal to obtain a plurality of correlation values for the residual ICI and the channel noise; and d) performing a communication signal processing for the frequency division multiplexing signal based on at least one of the plural correlation values.

摘要翻译： 提供一种用于处理在信道中发送的频分复用信号的方法。 该方法包括以下步骤：a）接收具有残余载波间干扰（ICI）和信道噪声并由多个子载波发射的频分复用信号; b）对频分复用信号执行循环前缀去除和离散付里叶变换以获得频域信号; c）分析频域信号以获得残余ICI和信道噪声的多个相关值; 以及d）基于所述多个相关值中的至少一个，对所述频分复用信号进行通信信号处理。