公开(公告)号：US08000227B2

公开(公告)日：2011-08-16

申请号：US12688733

申请日：2010-01-15

申请人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Ning Zhang ,  Yi-Hsiu Wang ,  Tao-Fei Samuel Ng

发明人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Ning Zhang ,  Yi-Hsiu Wang ,  Tao-Fei Samuel Ng

IPC分类号： H04J11/00

CPC分类号： H04L25/022 ,  H04L25/0236 ,  H04L27/2647 ,  H04L2025/03522

摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance.Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.

摘要翻译： 当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。 例如，使用数据分组的前导码中的两个训练符号来提供信道估计。 五十四个子通道中的四个保留用于提供相位估计。 然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。 有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。 决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

公开(公告)号：US20100111212A1

公开(公告)日：2010-05-06

申请号：US12688733

申请日：2010-01-15

申请人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Ning Zhang ,  Yi-Hsiu Wang ,  Tao-Fei Samuel Ng

发明人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Ning Zhang ,  Yi-Hsiu Wang ,  Tao-Fei Samuel Ng

IPC分类号： H04L27/28 ,  H04L27/00

CPC分类号： H04L25/022 ,  H04L25/0236 ,  H04L27/2647 ,  H04L2025/03522

摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.

摘要翻译： 当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。 例如，使用数据分组的前导码中的两个训练符号来提供信道估计。 五十四个子通道中的四个保留用于提供相位估计。 然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。 有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。 决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

公开(公告)号：US07693036B2

公开(公告)日：2010-04-06

申请号：US11150619

申请日：2005-06-10

申请人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Ning Zhang ,  Yi-Hsiu Wang ,  Tao-Fei Samuel Ng

发明人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Ning Zhang ,  Yi-Hsiu Wang ,  Tao-Fei Samuel Ng

IPC分类号： H04J11/00

CPC分类号： H04L25/022 ,  H04L25/0236 ,  H04L27/2647 ,  H04L2025/03522

摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.

摘要翻译： 当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。 例如，使用数据分组的前导码中的两个训练符号来提供信道估计。 五十四个子通道中的四个保留用于提供相位估计。 然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。 有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。 决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

公开(公告)号：US07623467B1

公开(公告)日：2009-11-24

申请号：US10666953

申请日：2003-09-17

申请人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Yi-Hsiu Wang

发明人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Yi-Hsiu Wang

IPC分类号： H04L12/28

CPC分类号： H04L25/0212 ,  H04L25/0226

摘要： A system and method are disclosed for wireless channel estimation. Estimating the characteristics of a wireless channel includes receiving a plurality of training symbols sent for the purpose of facilitating channel estimation; calculating a phase difference between at least two of the training symbols; using the calculated phase difference to coherently combine the training symbols to produce a composite training symbol; and using the composite training symbol to estimate the channel.

摘要翻译： 公开了一种用于无线信道估计的系统和方法。 估计无线信道的特性包括接收为便于信道估计而发送的多个训练符号; 计算至少两个训练符号之间的相位差; 使用所计算的相位差来相干地组合训练符号以产生复合训练符号; 并使用复合训练符号来估计信道。

公开(公告)号：US07039004B2

公开(公告)日：2006-05-02

申请号：US10263415

申请日：2002-10-01

申请人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Ning Zhang ,  Yi-Hsiu Wang ,  Tao-Fei Samuel Ng

发明人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Ning Zhang ,  Yi-Hsiu Wang ,  Tao-Fei Samuel Ng

IPC分类号： H04J11/00

CPC分类号： H04L25/022 ,  H04L25/0236 ,  H04L27/2647 ,  H04L2025/03522

摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.

摘要翻译： 当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。 例如，使用数据分组的前导码中的两个训练符号来提供信道估计。 五十四个子通道中的四个保留用于提供相位估计。 然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。 有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。 决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

公开(公告)号：US20050226341A1

公开(公告)日：2005-10-13

申请号：US11150619

申请日：2005-06-10

申请人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey Gilbert ,  Ning Zhang ,  Yi-Hsiu Wang ,  Tao-Fei Ng

发明人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey Gilbert ,  Ning Zhang ,  Yi-Hsiu Wang ,  Tao-Fei Ng

IPC分类号： H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04L27/28

CPC分类号： H04L25/022 ,  H04L25/0236 ,  H04L27/2647 ,  H04L2025/03522

摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.

摘要翻译： 当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。 例如，使用数据分组的前导码中的两个训练符号来提供信道估计。 五十四个子通道中的四个保留用于提供相位估计。 然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。 有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。 决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

公开(公告)号：US20080123761A1

公开(公告)日：2008-05-29

申请号：US11952040

申请日：2007-12-06

申请人： Won-Joon Choi ,  Jeffrey M. Gilbert ,  Yi-Hsiu Wang ,  Xiaoru Zhang

发明人： Won-Joon Choi ,  Jeffrey M. Gilbert ,  Yi-Hsiu Wang ,  Xiaoru Zhang

IPC分类号： H04L27/28

CPC分类号： H04L25/0232 ,  H04L1/0045 ,  H04L27/2647

摘要： Spurs cause significant problems with signal detecting, amplifier gain adjustment, and signal decoding. Various techniques can be used to mitigate the effects of spurs on a received signal. Generally, these techniques work by either canceling or ignoring the spurs. For example, a pilot mask can be used to ignore pilot information in one or more sub-channels. A Viterbi mask can determine the weighting given to bits in a sub-channel based on spur and data rate information. Channel interpolation can compute a pseudo channel estimate for a sub-channel known to have a spur location can be computed by interpolating the channel estimates of adjacent good sub-channels. Filtering of the received signal using a low-pass filter, a growing box filter, or a low-pass filter with self-correlation can be used to cancel a spur.

摘要翻译： 马刺在信号检测，放大器增益调整和信号解码方面造成重大问题。 可以使用各种技术来减轻杂散对接收信号的影响。 一般来说，这些技术通过取消或忽略杂散来工作。 例如，可以使用导频掩码来忽略一个或多个子信道中的导频信息。 维特比掩码可以基于支线和数据速率信息来确定子信道中的比特的加权。 信道内插可以计算已知具有支路位置的子信道的伪信道估计，可以通过内插相邻的良好子信道的信道估计来计算。 使用低通滤波器，增长盒滤波器或具有自相关的低通滤波器对接收信号进行滤波可以用于取消杂散。

公开(公告)号：US07366089B2

公开(公告)日：2008-04-29

申请号：US10682787

申请日：2003-10-08

申请人： Ardavan M. Tehrani ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Yi Hsiu Wang

发明人： Ardavan M. Tehrani ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Yi Hsiu Wang

IPC分类号： H04L5/04

CPC分类号： H04L27/2657 ,  H04B7/0845 ,  H04B7/0848 ,  H04L27/2663 ,  H04L27/2665 ,  H04L27/2675

摘要： The present invention provides an apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals, where the apparatus includes M receive antennas, receiving M high data rate wideband packetized wireless communication signals, where each of the signals includes N frequency bins. The apparatus, in an exemplary embodiment, includes (1) a joint timing recovery units that perform joint coarse signal timing estimation, joint frequency offset estimation, and joint fine timing estimation on each of the signals, (2) M Fast Fourier Transform units (FFTs) that each convert the digital data for each of the M signals into frequency domain information for each of the N received frequencies and that output Q pilots for each of the signals, where Q is a positive integer, and (3) a combiner that weights and combines the outputs of the M FFTs for each of the N received frequencies.

摘要翻译： 本发明提供了一种多天线接收机组合的高数据率宽带分组化无线通信信号的装置和方法，其中该装置包括M个接收天线，接收M个高数据速率宽带分组化无线通信信号，其中每个信号包括N个频率 箱子。 在一个示例性实施例中，该装置包括（1）联合定时恢复单元，其对每个信号执行联合粗略信号定时估计，联合频率偏移估计和联合精细定时估计，（2）M个快速傅里叶变换单元 FFT），其将每个M个信号的数字数据转换为N个接收频率中的每一个的频域信息，并且为每个信号输出Q个导频，其中Q是正整数，以及（3）组合器， 对N个接收频率中的每一个进行加权并组合M FFT的输出。

公开(公告)号：US07321631B1

公开(公告)日：2008-01-22

申请号：US11461347

申请日：2006-07-31

申请人： Won-Joon Choi ,  Jeffrey M. Gilbert ,  Yi-Hsiu Wang ,  Xiaoru Zhang

发明人： Won-Joon Choi ,  Jeffrey M. Gilbert ,  Yi-Hsiu Wang ,  Xiaoru Zhang

IPC分类号： H03D1/00 ,  H04K1/10

CPC分类号： H04L25/0232 ,  H04L1/0045 ,  H04L27/2647

摘要： Spurs cause significant problems with signal detecting, amplifier gain adjustment, and signal decoding. Various techniques can be used to mitigate the effects of spurs on a received signal. Generally, these techniques work by either canceling or ignoring the spurs. For example, a pilot mask can be used to ignore pilot information in one or more sub-channels. A Viterbi mask can determine the weighting given to bits in a sub-channel based on spur and data rate information. Channel interpolation can compute a pseudo channel estimate for a sub-channel known to have a spur location can be computed by interpolating the channel estimates of adjacent good sub-channels. Filtering of the received signal using a low-pass filter, a growing box filter, or a low-pass filter with self-correlation can be used to cancel a spur.

摘要翻译： 马刺在信号检测，放大器增益调整和信号解码方面造成重大问题。 可以使用各种技术来减轻杂散对接收信号的影响。 一般来说，这些技术通过取消或忽略杂散来工作。 例如，可以使用导频掩码来忽略一个或多个子信道中的导频信息。 维特比掩码可以基于支线和数据速率信息来确定子信道中的比特的加权。 信道内插可以计算已知具有支路位置的子信道的伪信道估计，可以通过内插相邻的良好子信道的信道估计来计算。 使用低通滤波器，增长盒滤波器或具有自相关的低通滤波器对接收信号进行滤波可以用于取消杂散。

公开(公告)号：US08184754B1

公开(公告)日：2012-05-22

申请号：US13081452

申请日：2011-04-06

申请人： Won-Joon Choi ,  Jeffrey M. Gilbert ,  Yi-Hsiu Wang ,  Xiaoru Zhang

发明人： Won-Joon Choi ,  Jeffrey M. Gilbert ,  Yi-Hsiu Wang ,  Xiaoru Zhang

IPC分类号： H04B1/00

CPC分类号： H04L25/0232 ,  H04L1/0045 ,  H04L27/2647

摘要： Spurs cause significant problems with signal detecting, amplifier gain adjustment, and signal decoding. Various techniques can be used to mitigate the effects of spurs on a received signal. Generally, these techniques work by either canceling or ignoring the spurs. For example, a pilot mask can be used to ignore pilot information in one or more sub-channels. A Viterbi mask can determine the weighting given to bits in a sub-channel based on spur and data rate information. Channel interpolation can compute a pseudo channel estimate for a sub-channel known to have a spur location can be computed by interpolating the channel estimates of adjacent good sub-channels. Filtering of the received signal using a low-pass filter, a growing box filter, or a low-pass filter with self-correlation can be used to cancel a spur.

摘要翻译： 马刺在信号检测，放大器增益调整和信号解码方面造成重大问题。 可以使用各种技术来减轻杂散对接收信号的影响。 一般来说，这些技术通过取消或忽略杂散来工作。 例如，可以使用导频掩码来忽略一个或多个子信道中的导频信息。 维特比掩码可以基于支线和数据速率信息来确定子信道中的比特的加权。 信道内插可以计算已知具有支路位置的子信道的伪信道估计，可以通过内插相邻的良好子信道的信道估计来计算。 使用低通滤波器，增长盒滤波器或具有自相关的低通滤波器对接收信号进行滤波可以用于取消杂散。