公开(公告)号：US20080219339A1

公开(公告)日：2008-09-11

申请号：US11853809

申请日：2007-09-11

申请人： Rabih Chrabieh ,  Samir S. Soliman

发明人： Rabih Chrabieh ,  Samir S. Soliman

IPC分类号： H03H7/40

CPC分类号： H04L5/0007 ,  H04L25/022 ,  H04L25/0226 ,  H04L25/0228 ,  H04L27/2613

摘要： A system and method are provided for supplying a frequency-smoothed communications training signal. The method generates a frequency-smoothed unbiased training signal in a quadrature modulation transmitter. The frequency-smoothed unbiased training signal includes a plurality of pilot signal products, where each pilot signal product includes complex plane information represented by a reference frequency subcarrier, multiplying complex plane information represented by mirror frequency subcarrier. The sum of the plurality of pilot signal products is equal to zero. The method supplies the frequency-smoothed unbiased training signal so that it may be transmitted within a single symbol period. System and methods are also provided for using a frequency-smoothed training signal in the calculation of a receiver channel estimate.

摘要翻译： 提供了一种用于提供频率平滑通信训练信号的系统和方法。 该方法在正交调制发射机中产生频率平滑的无偏置训练信号。 频率平滑的无偏置训练信号包括多个导频信号乘积，其中每个导频信号乘积包括由参考频率副载波表示的复平面信息，乘以由镜频副载波表示的复平面信息。 多个导频信号乘积的和等于零。 该方法提供频率平滑的无偏置训练信号，使得其可以在单个符号周期内传输。 还提供了系统和方法，用于在接收机信道估计的计算中使用经频率平滑的训练信号。

公开(公告)号：US08488691B2

公开(公告)日：2013-07-16

申请号：US12266842

申请日：2008-11-07

申请人： Rabih Chrabieh ,  Samir S. Soliman ,  Ozgur Dural

发明人： Rabih Chrabieh ,  Samir S. Soliman ,  Ozgur Dural

IPC分类号： H04L27/28

CPC分类号： H04W28/08 ,  H04L5/0007 ,  H04L5/0046 ,  H04L5/0064 ,  H04L5/0085

摘要： An orthogonal frequency division multiplex (OFDM) transmitter may adaptively load each sub-carrier, buffering less than an OFDM frame in order to reduce hardware requirements and latency. The transmitter may use feedback information from the receiver regarding the quality of the sub-carriers. In addition, combining repetition and puncturing to achieve a desired date rate per class further reduces hardware by simplifying or even eliminating an interleaver. Additional mitigation and even performance enhancement techniques are incorporated to address inter-class boundaries within an OFDM frame, such as introducing transition classes. Channel state information may be reported in various formats including full bitmap, changed subchannels, and reported bad subchannels.

摘要翻译： 正交频分复用（OFDM）发射机可以自适应地加载每个子载波，缓冲小于OFDM帧，以便减少硬件要求和等待时间。 发射机可以使用来自接收机的关于子载波的质量的反馈信息。 此外，组合重复和删截以实现每个类别的所需日期速率通过简化或甚至消除交织器来进一步降低硬件。 并入了额外的缓解和甚至性能增强技术来解决OFDM帧内的类间边界，例如引入转换类。 信道状态信息可以以各种格式报告，包括完整的位图，改变的子信道和报告的坏子信道。

公开(公告)号：US07983356B2

公开(公告)日：2011-07-19

申请号：US11772092

申请日：2007-06-29

申请人： Rabih Chrabieh ,  Samir S. Soliman

发明人： Rabih Chrabieh ,  Samir S. Soliman

IPC分类号： H04L27/00 ,  H04J11/00

CPC分类号： H04L5/0044

摘要： A system and method are provided for using frequency domain spreading to generate real signals in the time domain. The method supplies a first complex frequency domain symbol (α) and a second complex frequency domain symbol (αi), and maps (α+jαi) onto a subcarrier (+f). Further, (α−jαi)* is mapped onto a mirror subcarrier (−f). The mappings are converted into a complex time domain symbol carrying α and jαi in a single inverse fast Fourier transformation (IFFT). The real component of the complex time domain symbol (α) is initially supplied, and subsequently supplied is an imaginary component of the complex time domain symbol (αi). The real symbol component (α) is supplied by carrying α on the subcarrier (+f), and carrying (α)* on the mirror subcarrier (−f). The imaginary symbol component αi is supplied by carrying αi on the subcarrier (+f), and carrying (αi)* on the mirror subcarrier (−f).

摘要翻译： 提供了一种使用频域扩展在时域中产生实信号的系统和方法。 该方法提供第一复频域符号（α）和第二复频域符号（αi），并将（α+jαi）映射到子载波（+ f）上。 此外，（α-jαi）*映射到镜子载波（-f）。 映射在单个快速傅里叶逆变换（IFFT）中被转换成携带α和jαi的复杂时域符号。 最初提供复时域符号（α）的真实分量，随后提供复数时域符号（αi）的虚分量。 通过在子载波（+ f）上携带α并在镜像副载波（-f）上携带（α）*来提供实际符号分量（α）。 通过在子载波（+ f）上携带αi并在镜像副载波（-f）上携带（αi）*来提供虚拟符号分量αi。

公开(公告)号：US20100086066A1

公开(公告)日：2010-04-08

申请号：US12266842

申请日：2008-11-07

申请人： Rabih Chrabieh ,  Samir S. Soliman ,  Ozgur Dural

发明人： Rabih Chrabieh ,  Samir S. Soliman ,  Ozgur Dural

IPC分类号： H04L27/28

CPC分类号： H04W28/08 ,  H04L5/0007 ,  H04L5/0046 ,  H04L5/0064 ,  H04L5/0085

摘要： An orthogonal frequency division multiplex (OFDM) transmitter may adaptively load each sub-carrier, buffering less than an OFDM frame in order to reduce hardware requirements and latency. The transmitter may use feedback information from the receiver regarding the quality of the sub-carriers. In addition, combining repetition and puncturing to achieve a desired date rate per class further reduces hardware by simplifying or even eliminating an interleaver. Additional mitigation and even performance enhancement techniques are incorporated to address inter-class boundaries within an OFDM frame, such as introducing transition classes. Channel state information may be reported in various formats including full bitmap, changed subchannels, and reported bad subchannels.

摘要翻译： 正交频分复用（OFDM）发射机可以自适应地加载每个子载波，缓冲小于OFDM帧，以便减少硬件要求和等待时间。 发射机可以使用来自接收机的关于子载波的质量的反馈信息。 此外，组合重复和删截以实现每个类别的所需日期速率通过简化或甚至消除交织器来进一步降低硬件。 并入了额外的缓解和甚至性能增强技术来解决OFDM帧内的类间边界，例如引入转换类。 信道状态信息可以以各种格式报告，包括完整的位图，改变的子信道和报告的坏子信道。

公开(公告)号：US20090004984A1

公开(公告)日：2009-01-01

申请号：US11772092

申请日：2007-06-29

申请人： Rabih Chrabieh ,  Samir S. Soliman

发明人： Rabih Chrabieh ,  Samir S. Soliman

IPC分类号： H04B1/00

CPC分类号： H04L5/0044

摘要： A system and method are provided for using frequency domain spreading to generate real signals in the time domain. The method supplies a first complex frequency domain symbol (α) and a second complex frequency domain symbol (αi), and maps (α+jαi) onto a subcarrier (+f). Further, (α−jαi)* is mapped onto a mirror subcarrier (−f). The mappings are converted into a complex time domain symbol carrying α and jαi in a single inverse fast Fourier transformation (IFFT). The real component of the complex time domain symbol (α) is initially supplied, and subsequently supplied is an imaginary component of the complex time domain symbol (αi). The real symbol component (α) is supplied by carrying a on the subcarrier (+f), and carrying (α)* on the mirror subcarrier (−f). The imaginary symbol component αi is supplied by carrying αi on the subcarrier (+f), and carrying (αi)* on the mirror subcarrier (−f).

摘要翻译： 提供了一种使用频域扩展在时域中产生实信号的系统和方法。 该方法提供第一复杂频域符号（α）和第二复频域符号（alphai），并将（α+ jalphai）映射到子载波（+ f）上。 此外，（alpha-jalphai）*映射到镜像副载波（-f）。 映射在单个快速傅里叶逆变换（IFFT）中被转换成携带alpha和jalphai的复杂时域符号。 最初提供复时域符号（α）的真实分量，随后提供复数时域符号（alphai）的虚部分。 通过在子载波（+ f）上携带，并在镜像副载波（-f）上携带（α）*来提供真实符号分量（α）。 通过在副载波（+ f）上携带alphai并在镜像副载波（-f）上携带（alphai）*来提供虚拟符号分量alphai。

公开(公告)号：US08009750B2

公开(公告)日：2011-08-30

申请号：US11962709

申请日：2007-12-21

申请人： Rabih Chrabieh ,  Samir S. Soliman

发明人： Rabih Chrabieh ,  Samir S. Soliman

IPC分类号： H04L27/28

CPC分类号： H04J11/0036 ,  H04J11/0066 ,  H04L27/2649 ,  H04L27/2662

摘要： A receiver window for symbol extraction is provided. A symbol is spread across a plurality of sub-carriers of a frequency band for transmission. If the frequency band is affected by narrowband interference, the receiver window concentrates the narrowband interference energy to minimize its effect on distant sub-carriers within the frequency band. The receiver window is shaped for extracting the symbol from the frequency band, wherein the receiver window has a starting point before the start of the symbol. The receiver window overlaps a previous receiver window for the previous adjacent symbol on the same frequency band. The receiver window is shaped by overlapping and adding a channel impulse response segment from a zero-padded portion of the symbol to the beginning of the symbol and overlapping and adding a second portion from the previous zero-padded symbol (from the same frequency band) to the end of the symbol.

摘要翻译： 提供了用于符号提取的接收器窗口。 符号分布在用于传输的频带的多个子载波上。 如果频带受到窄带干扰的影响，则接收机窗口集中了窄带干扰能量，以最小化其对频带内远距离子载波的影响。 接收器窗口被成形为用于从频带提取符号，其中接收器窗口具有在符号开始之前的起始点。 接收器窗口与先前在相同频带上的相邻符号的接收器窗口重叠。 接收器窗口通过将信号脉冲响应段从符号的零填充部分重叠并添加到符号的开始并重叠并且从先前的零填充符号（从相同的频带）添加第二部分而被整形， 到符号的末尾。

公开(公告)号：US20120039421A1

公开(公告)日：2012-02-16

申请号：US13180393

申请日：2011-07-11

申请人： Rabih Chrabieh ,  Samir S. Soliman

发明人： Rabih Chrabieh ,  Samir S. Soliman

IPC分类号： H04L27/06

CPC分类号： H04L27/3863

摘要： A system and method are provided for removing quadrature imbalance errors in received data. The method accepts an unbiased training sequence in a quadrature demodulation receiver. An unbiased training sequence has a uniform accumulated power evenly distributed in a complex plane, and includes predetermined reference signals (p) at frequency +f and predetermined mirror signals (pm) at frequency −f. The unbiased training sequence is processed, generating a sequence of processed symbols (y) at frequency +f, representing complex plane information in the unbiased training sequence. Each processed symbol (y) is multiplied by the mirror signal (pm), and an unbiased quadrature imbalance estimate Bm is obtained at frequency (−f). Using quadrature imbalance estimates, channel estimates, and processed symbols, an imbalance-corrected symbol can be generated.

摘要翻译： 提供了一种用于消除接收数据中的正交不平衡误差的系统和方法。 该方法在正交解调接收机中接受无偏差的训练序列。 无偏差的训练序列具有均匀分布在复平面中的均匀累积功率，并且包括频率为+ f的预定参考信号（p）和频率为-f的预定镜像信号（pm）。 处理无偏差训练序列，以频率+ f生成经处理符号（y）的序列，表示无偏差训练序列中的复平面信息。 每个被处理符号（y）乘以镜像信号（pm），并且以频率（-f）获得无偏差正交不平衡估计Bm。 使用正交不平衡估计，信道估计和经处理的符号，可以产生不平衡校正的符号。

公开(公告)号：US08081695B2

公开(公告)日：2011-12-20

申请号：US11853809

申请日：2007-09-11

申请人： Rabih Chrabieh ,  Samir S. Soliman

发明人： Rabih Chrabieh ,  Samir S. Soliman

IPC分类号： H04L23/02 ,  H04L27/36 ,  H04L27/38

CPC分类号： H04L5/0007 ,  H04L25/022 ,  H04L25/0226 ,  H04L25/0228 ,  H04L27/2613

摘要： A system and method are provided for supplying a frequency-smoothed communications training signal. The method generates a frequency-smoothed unbiased training signal in a quadrature modulation transmitter. The frequency-smoothed unbiased training signal includes a plurality of pilot signal products, where each pilot signal product includes complex plane information represented by a reference frequency subcarrier, multiplying complex plane information represented by mirror frequency subcarrier. The sum of the plurality of pilot signal products is equal to zero. The method supplies the frequency-smoothed unbiased training signal so that it may be transmitted within a single symbol period. System and methods are also provided for using a frequency-smoothed training signal in the calculation of a receiver channel estimate.

摘要翻译： 提供了一种用于提供频率平滑通信训练信号的系统和方法。 该方法在正交调制发射机中产生频率平滑的无偏置训练信号。 频率平滑的无偏置训练信号包括多个导频信号乘积，其中每个导频信号乘积包括由参考频率副载波表示的复平面信息，乘以由镜频副载波表示的复平面信息。 多个导频信号乘积的和等于零。 该方法提供频率平滑的无偏置训练信号，使得其可以在单个符号周期内传输。 还提供了系统和方法，用于在接收机信道估计的计算中使用经频率平滑的训练信号。

公开(公告)号：US08064550B2

公开(公告)日：2011-11-22

申请号：US11853808

申请日：2007-09-11

申请人： Rabih Chrabieh ,  Samir S. Soliman

发明人： Rabih Chrabieh ,  Samir S. Soliman

IPC分类号： H04L27/06

CPC分类号： H04L27/3863

摘要： A system and method are provided for removing quadrature imbalance errors in received data. The method accepts an unbiased training sequence in a quadrature demodulation receiver. An unbiased training sequence has a uniform accumulated power evenly distributed in a complex plane, and includes predetermined reference signals (p) at frequency +f and predetermined mirror signals (pm) at frequency −f. The unbiased training sequence is processed, generating a sequence of processed symbols (y) at frequency +f, representing complex plane information in the unbiased training sequence. Each processed symbol (y) is multiplied by the mirror signal (pm), and an unbiased quadrature imbalance estimate Bm is obtained at frequency (−f). Using quadrature imbalance estimates, channel estimates, and processed symbols, an imbalance-corrected symbol can be generated.

摘要翻译： 提供了一种用于消除接收数据中的正交不平衡误差的系统和方法。 该方法在正交解调接收机中接受无偏差的训练序列。 无偏差的训练序列具有均匀分布在复平面中的均匀累积功率，并且包括频率为+ f的预定参考信号（p）和频率为-f的预定镜像信号（pm）。 处理无偏差训练序列，以频率+ f生成经处理符号（y）的序列，表示无偏差训练序列中的复平面信息。 每个被处理符号（y）乘以镜像信号（pm），并且以频率（-f）获得无偏差正交不平衡估计Bm。 使用正交不平衡估计，信道估计和经处理的符号，可以产生不平衡校正的符号。

公开(公告)号：US20090161804A1

公开(公告)日：2009-06-25

申请号：US11962709

申请日：2007-12-21

申请人： Rabih Chrabieh ,  Samir S. Soliman

发明人： Rabih Chrabieh ,  Samir S. Soliman

IPC分类号： H04B1/10

CPC分类号： H04J11/0036 ,  H04J11/0066 ,  H04L27/2649 ,  H04L27/2662

摘要： A receiver window for symbol extraction is provided. A symbol is spread across a plurality of sub-carriers of a frequency band for transmission. If the frequency band is affected by narrowband interference, the receiver window concentrates the narrowband interference energy to minimize its effect on distant sub-carriers within the frequency band. The receiver window is shaped for extracting the symbol from the frequency band, wherein the receiver window has a starting point before the start of the symbol. The receiver window overlaps a previous receiver window for the previous adjacent symbol on the same frequency band. The receiver window is shaped by overlapping and adding a channel impulse response segment from a zero-padded portion of the symbol to the beginning of the symbol and overlapping and adding a second portion from the previous zero-padded symbol (from the same frequency band) to the end of the symbol.

摘要翻译： 提供了用于符号提取的接收器窗口。 符号分布在用于传输的频带的多个子载波上。 如果频带受到窄带干扰的影响，则接收机窗口集中了窄带干扰能量，以最小化其对频带内远距离子载波的影响。 接收器窗口被成形为用于从频带提取符号，其中接收器窗口具有在符号开始之前的起始点。 接收器窗口与先前在相同频带上的相邻符号的接收器窗口重叠。 接收器窗口通过将信号脉冲响应段从符号的零填充部分重叠并添加到符号的开始并重叠并且从先前的零填充符号（从相同的频带）添加第二部分而被整形， 到符号的末尾。