公开(公告)号：US20080260056A1

公开(公告)日：2008-10-23

申请号：US12103698

申请日：2008-04-15

申请人： Jianxuan Du ,  Yue Chen ,  Baoguo Yang

发明人： Jianxuan Du ,  Yue Chen ,  Baoguo Yang

IPC分类号： H04L27/28

CPC分类号： H04L27/2657 ,  H04L25/0212 ,  H04L27/2695

摘要： The present invention provides methods for selecting the coarse frequency offset estimation in an orthogonal frequency division multiplexing system that may include: searching within a predefined subset for a set of frequency offset candidates; selectively searching outside the predefined subset for additional frequency offset candidates; and combining one or more ICDC method and CIR based method to select the coarse frequency offset.

摘要翻译： 本发明提供了用于在正交频分复用系统中选择粗频偏估计的方法，所述正交频分复用系统可以包括：在预定义子集内搜索一组频偏候选; 选择性地在预定义子集之外搜索额外的频率偏移候选; 并组合一个或多个ICDC方法和基于CIR的方法来选择粗频偏移。

公开(公告)号：US08023597B2

公开(公告)日：2011-09-20

申请号：US12103698

申请日：2008-04-15

申请人： Jianxuan Du ,  Yue Chen ,  Baoguo Yang

发明人： Jianxuan Du ,  Yue Chen ,  Baoguo Yang

IPC分类号： H04L27/06

CPC分类号： H04L27/2657 ,  H04L25/0212 ,  H04L27/2695

摘要： The present invention provides methods for selecting the coarse frequency offset estimation in an orthogonal frequency division multiplexing system that may include: searching within a predefined subset for a set of frequency offset candidates; selectively searching outside the predefined subset for additional frequency offset candidates; and combining one or more ICDC method and CIR based method to select the coarse frequency offset.

摘要翻译： 本发明提供了用于在正交频分复用系统中选择粗频偏估计的方法，所述正交频分复用系统可包括：在预定义子集内搜索一组频偏候选; 选择性地在预定义子集之外搜索额外的频率偏移候选; 并组合一个或多个ICDC方法和基于CIR的方法来选择粗频偏移。

公开(公告)号：US20090110135A1

公开(公告)日：2009-04-30

申请号：US12258362

申请日：2008-10-24

申请人： Jianxuan Du ,  Yue Chen ,  Baoguo Yang

发明人： Jianxuan Du ,  Yue Chen ,  Baoguo Yang

IPC分类号： H04L7/00

CPC分类号： H04L27/2675 ,  H04L27/2665 ,  H04L27/2695

摘要： This invention relates to methods for determining symbol timing shift for a received signal, comprising the steps of: demodulating a received signal; removing a phase reference sequence from the demodulated signal to generate a channel frequency response; converting said channel frequency response to the time domain to generate a channel impulse response; determining a detection threshold; determining a first path and a last path as a function of the detection threshold; and calculating a timing shift as a function of the first path and the last path.

摘要翻译： 本发明涉及用于确定接收信号的符号定时偏移的方法，包括以下步骤：解调所接收的信号; 从解调信号中去除相位参考序列以产生信道频率响应; 将所述信道频率响应转换成时域以产生信道脉冲响应; 确定检测阈值; 确定作为所述检测阈值的函数的第一路径和最后路径; 以及计算作为所述第一路径和所述最后路径的函数的定时偏移。

公开(公告)号：US20090103667A1

公开(公告)日：2009-04-23

申请号：US12253927

申请日：2008-10-17

申请人： Jianxuan Du ,  Yue Chen ,  Baoguo Yang

发明人： Jianxuan Du ,  Yue Chen ,  Baoguo Yang

IPC分类号： H04L27/06

CPC分类号： H04L27/2647 ,  H04H60/07 ,  H04L27/2656 ,  H04L27/2663 ,  H04L27/2678

摘要： This invention relates to methods for determining coarse symbol timing and mode detection by using CP correlation-based techniques. In particular, this invention relates to methods for determining symbol timing, frame timing, and system mode for signal acquisition, comprising the steps of: detecting symbol timing and system mode based on cyclic prefix correlation; and determining a null symbol as a function of a pre-defined number of consecutive symbols and using said null symbol to determine frame timing.

摘要翻译： 本发明涉及通过使用基于CP相关的技术来确定粗符号定时和模式检测的方法。 具体地说，本发明涉及用于确定信号采集的符号定时，帧定时和系统模式的方法，包括以下步骤：基于循环前缀相关检测符号定时和系统模式; 以及确定作为预定数量的连续符号的函数的空符号，并且使用所述空符号来确定帧定时。

公开(公告)号：US20090103601A1

公开(公告)日：2009-04-23

申请号：US12253919

申请日：2008-10-17

申请人： Jianxuan Du ,  Yue Chen

发明人： Jianxuan Du ,  Yue Chen

IPC分类号： H04B1/66

CPC分类号： H04L25/067 ,  H03M7/08 ,  H03M7/50 ,  H04L1/0071 ,  H04L5/0007

摘要： This invention provides methods for reducing the bit width of soft information, while maintaining a large dynamic range by applying compression and expansion. In particular, this invention provides methods for time de-interleaving of soft information, comprising the steps of: quantizing the soft information into a first soft information having a first pre-defined number of bits; compressing the first soft information into a second soft information having a second pre-defined number of bits; time de-interleaving the second soft information; and decompressing the time de-interleaved second soft information.

摘要翻译： 本发明提供了通过应用压缩和扩展来保持较大动态范围的方式来减少软信息的位宽度。 具体地，本发明提供了用于软信息的时间去交织的方法，包括以下步骤：将软信息量化为具有第一预定位数的第一软信息; 将第一软信息压缩成具有第二预定位数的第二软信息; 时间去交织第二软信息; 并解压缩时间去交织的第二软信息。

公开(公告)号：US20060198434A1

公开(公告)日：2006-09-07

申请号：US11271692

申请日：2005-11-10

申请人： Yue Chen ,  Arkady Molev-Shteiman ,  Aric Heiman ,  Nelson Sollenberger ,  Iluaiyu (Ilanks) Zeng ,  Baoguo Yang

发明人： Yue Chen ,  Arkady Molev-Shteiman ,  Aric Heiman ,  Nelson Sollenberger ,  Iluaiyu (Ilanks) Zeng ,  Baoguo Yang

IPC分类号： H03K5/159 ,  H03H7/30 ,  H04B1/10

CPC分类号： H04L25/03171 ,  H04L25/03133

摘要： The present invention provides a multi-branch equalizer processing module operable to cancel interference associated with received radio frequency (RF) burst(s). This multi-branch equalizer processing module includes both a first equalizer processing branch and a second equalizer processing branch. The first equalizer processing branch is operable to be trained based upon known training sequences and equalize the received RF burst. This results in soft samples or decisions which in turn may be converted to data bits. The soft samples are processed with a de-interleaver and channel decoder, where the combination is operable to produce a decoded frame of data bits from the soft samples. A re-encoder may re-encode the decoded frame to produce re-encoded or at least partially re-encoded data bits. An interleaver then processes the at least partially re-encoded data bits to produce and at least partially re-encoded burst. The second equalizer processing branch uses the at least partially re-encoded data bits to train linear equalizer(s) within-the second equalizer processing branch. A buffer may initially store the received RF burst(s), which are retrieved and equalized by the second equalizer processing branch once the linear equalizer(s) are trained. This results in alternate soft samples or decisions which in turn may be converted to alternate data bits. The alternate soft samples are processed with the de-interleaver and channel decoder, where the combination is operable to produce an alternate decoded frame of data bits from the alternate soft samples. This allows interfering signals to be cancelled and more accurate processing of the received RF bursts to occur.

公开(公告)号：US20060198432A1

公开(公告)日：2006-09-07

申请号：US11150925

申请日：2005-06-13

申请人： Huaiyu (Hanks) Zeng ,  Baoguo Yang ,  Arkady Molev-Shteiman ,  Arie Heiman ,  Yue Chen ,  Nelson R. Sollenberger

发明人： Huaiyu (Hanks) Zeng ,  Baoguo Yang ,  Arkady Molev-Shteiman ,  Arie Heiman ,  Yue Chen ,  Nelson R. Sollenberger

IPC分类号： H03H7/30 ,  H03D1/04

CPC分类号： H04L25/03171 ,  H04L25/03133

摘要： The present invention provides a multi-branch equalizer processing module operable to cancel interference associated with received radio frequency (RF) burst(s). This multi-branch equalizer processing module includes both a first equalizer processing branch and a second equalizer processing branch. The first equalizer processing branch is operable to be trained based upon known training sequences and equalize the received RF burst. This results in soft samples or decisions which in turn may be converted to data bits. The soft samples are processed with a de-interleaver and channel decoder, where the combination is operable to produce a decoded frame of data bits from the soft samples. A re-encoder may re-encode the decoded frame to produce re-encoded or at least partially re-encoded data bits. An interleaver then processes the at least partially re-encoded data bits to produce and at least partially re-encoded burst. The second equalizer processing branch uses the at least partially re-encoded data bits to train linear equalizer(s) within the second equalizer processing branch. A buffer may initially store the received RF burst(s), which are retrieved and equalized by the second equalizer processing branch once the linear equalizer(s) are trained. This results in alternate soft samples or decisions which in turn may be converted to alternate data bits. The alternate soft samples are processed with the de-interleaver and channel decoder, where the combination is operable to produce an alternate decoded frame of data bits from the alternate soft samples. This allows interfering signals to be cancelled and more accurate processing of the received RF bursts to occur.

摘要翻译： 本发明提供一种多分支均衡器处理模块，其可操作以消除与接收的射频（RF）突发相关联的干扰。 该多分支均衡器处理模块包括第一均衡器处理分支和第二均衡器处理分支。 第一均衡器处理分支可操作以基于已知的训练序列进行训练，并均衡所接收的RF突发。 这导致软样本或决策，而这些样本或决定又可以转换为数据位。 软采样用解交织器和信道解码器处理，其中组合可操作以从软样本产生解码的数据比特帧。 重新编码器可以对解码的帧进行重新编码，以产生重新编码或至少部分重新编码的数据比特。 交织器然后处理至少部分重新编码的数据比特以产生和至少部分地重新编码突发。 第二均衡器处理分支使用至少部分重新编码的数据比特来训练第二均衡器处理分支内的线性均衡器。 缓冲器可以初始地存储所接收的RF突发，一旦训练了线性均衡器，其将被第二均衡器处理分支检索和均衡。 这导致交替的软样本或决定，这又可以转换为备用数据位。 用去交织器和信道解码器处理替代软样本，其中组合可操作以从备选软样本产生替代解码的数据比特帧。 这允许消除干扰信号并且发生接收的RF突发的更精确的处理。

公开(公告)号：US07903728B2

公开(公告)日：2011-03-08

申请号：US12431605

申请日：2009-04-28

申请人： Yue Chen ,  Arkady Molev-Shteiman ,  Arie Heiman ,  Nelson R. Sollenberger ,  Huaiyu (Hanks) Zeng ,  Baoguo Yang

发明人： Yue Chen ,  Arkady Molev-Shteiman ,  Arie Heiman ,  Nelson R. Sollenberger ,  Huaiyu (Hanks) Zeng ,  Baoguo Yang

IPC分类号： H03H7/30 ,  H04B1/10

CPC分类号： H04L25/03171 ,  H04L25/03133

摘要： Equalizer training method using re-encoded bits and known training sequences. A multi-branch equalizer processing module is operable to cancel interference associated with received radio frequency (RF) burst(s) (e.g., using at least a first equalizer processing branch and a second equalizer processing branch). The first equalizer processing branch is operable to be trained based upon known training sequences and to equalize the received RF burst. The second equalizer processing branch uses at least partially re-encoded data bits to train linear equalizer(s) within the second equalizer processing branch. A buffer may initially store the received RF burst(s), which are retrieved and equalized by the second equalizer processing branch once the linear equalizer(s) are trained. The cooperation operation of these and other various components allows interfering signals to be cancelled and for more accurate processing of the received RF bursts to occur.

摘要翻译： 均衡器训练方法使用重新编码的位和已知的训练序列。 多分支均衡器处理模块可操作以消除与接收的射频（RF）突发相关联的干扰（例如，使用至少第一均衡器处理分支和第二均衡器处理分支）。 第一均衡器处理分支可操作以基于已知的训练序列进行训练，并均衡所接收的RF突发。 第二均衡器处理分支使用至少部分重新编码的数据位来训练第二均衡器处理分支内的线性均衡器。 缓冲器可以初始地存储所接收的RF突发，一旦训练了线性均衡器，其将被第二均衡器处理分支检索和均衡。 这些和其他各种组件的协作操作允许消除干扰信号并且为了更准确地处理接收的RF突发而发生。

公开(公告)号：US20090168930A1

公开(公告)日：2009-07-02

申请号：US12345658

申请日：2008-12-29

申请人： Junqiang Li ,  Baoguo Yang ,  Yue Chen

发明人： Junqiang Li ,  Baoguo Yang ,  Yue Chen

IPC分类号： H03D1/04

CPC分类号： H04L1/0026

摘要： A method for Doppler shift estimation for channel estimation of a received signal, comprising the steps of: calculating time domain correlations; providing a Hamming window over the calculated time domain correlations; calculating a power spectrum by using FFT; calculating an adaptive threshold based on a noise floor and an average power density calculated from the power spectrum; and estimating a Doppler shift based on the adaptive threshold.

摘要翻译： 一种用于接收信号的信道估计的多普勒频移估计的方法，包括以下步骤：计算时域相关; 在计算的时域相关性上提供汉明窗; 使用FFT计算功率谱; 基于从功率谱计算的噪声基底和平均功率密度来计算自适应阈值; 以及基于所述自适应阈值估计多普勒频移。

公开(公告)号：US20090097596A1

公开(公告)日：2009-04-16

申请号：US12253026

申请日：2008-10-16

申请人： Junqiang Li ,  Baoguo Yang ,  Yue Chen

发明人： Junqiang Li ,  Baoguo Yang ,  Yue Chen

IPC分类号： H04L27/06

CPC分类号： H04L25/03203 ,  H04L25/0212 ,  H04L25/0224 ,  H04L25/03292 ,  H04L2025/03414

摘要： Methods and systems are provided to reduce the effects of impulse noise in decoding a received OFDM signal by reducing the bit error number in burst error positions and by reducing the impulse noise contribution to channel estimation. In order to reduce the performance degradation due to impulse noise, it is important to find the position or the OFDM symbol where impulse noise occurs. The high noise variance gain can then be used for a Viterbi decoder to reduce the bit error number in burst error position, and also to reduce the contribution of the channel estimation by impulse noise in future channel estimations. Accordingly, the performance of the system can be greatly improved.

摘要翻译： 提供了方法和系统，以通过减少突发错误位置中的位错误数量以及减少对信道估计的脉冲噪声贡献来减少脉冲噪声对接收的OFDM信号进行解码的影响。 为了减少由于脉冲噪声引起的性能下降，重要的是要找到发生脉冲噪声的位置或OFDM符号。 然后可以将高噪声方差增益用于维特比解码器以减少突发错误位置中的位错误数量，并且还可以减少未来信道估计中脉冲噪声对信道估计的贡献。 因此，可以大大提高系统的性能。