公开(公告)号：US07965787B2

公开(公告)日：2011-06-21

申请号：US12217974

申请日：2008-07-10

申请人： Sujai Chari

发明人： Sujai Chari

IPC分类号： H04B7/02 ,  H04L1/02

CPC分类号： H04L1/0036 ,  H04B1/7156 ,  H04B1/7183 ,  H04B7/084 ,  H04B7/0871 ,  H04B2001/71563 ,  H04L1/06

摘要： Methods and systems of receiving wireless signals are disclosed. One method includes a receiver characterizing signal quality parameters of receive signals for a plurality of receive diversity settings. The receiver selects a first receive diversity setting for synchronizing the receiver with the receive signal based on the characterized signal quality parameters. The receiver selects a second receive diversity setting for receiving data with the receive signal based on the characterized signal quality parameters.

摘要翻译： 公开了接收无线信号的方法和系统。 一种方法包括表征多个接收分集设置的接收信号的信号质量参数的接收机。 接收机基于所表征的信号质量参数选择用于使接收机与接收信号同步的第一接收分集设置。 接收机基于所表征的信号质量参数选择用接收信号接收数据的第二接收分集设置。

公开(公告)号：US07719999B2

公开(公告)日：2010-05-18

申请号：US12231564

申请日：2008-09-04

申请人： Dengwei Fu ,  Sujai Chari ,  Mohan Ramasudha Karnam

发明人： Dengwei Fu ,  Sujai Chari ,  Mohan Ramasudha Karnam

IPC分类号： H04L12/26

CPC分类号： H04L27/2647 ,  H04B1/71637 ,  H04L1/0001 ,  H04L1/203

摘要： A method and apparatus of predicting link quality of a link are disclosed. One exemplary method includes a receiver receiving multi-carrier modulated signals over a period of time. A signal to noise ratio (SNR) for each received sub-carrier is estimated. An ordered sequence of the signal to noise ratios (SNR)s are constructed based on interleaving of the multi-carrier modulated signals, wherein an order of the interleaving is used to set the ordered sequence of the signal to noise ratios (SNR)s. The receiver estimates link packet error rate (PER) based upon knowledge of encoding of the multi-carrier modulated signals used during transmission and the ordered sequence.

摘要翻译： 公开了一种预测链路链路质量的方法和装置。 一种示例性方法包括在一段时间内接收多载波调制信号的接收机。 估计每个接收的子载波的信噪比（SNR）。 基于多载波调制信号的交织构造信噪比（SNR）s的有序序列，其中交织的顺序用于设置信噪比（SNR）s的有序序列。 接收机基于在传输期间使用的多载波调制信号和有序序列的编码知识来估计链路分组错误率（PER）。

公开(公告)号：US07440412B2

公开(公告)日：2008-10-21

申请号：US11374550

申请日：2006-03-13

申请人： Dengwei Fu ,  Sujai Chari ,  Mohan Ramasudha Karnam

发明人： Dengwei Fu ,  Sujai Chari ,  Mohan Ramasudha Karnam

IPC分类号： H04L12/26

CPC分类号： H04L27/2647 ,  H04B1/71637 ,  H04L1/0001 ,  H04L1/203

摘要： A method and apparatus of predicting link quality of a link is disclosed. The method includes receiving multi-carrier modulated signals over a period of time, estimating an SNR for each received sub-carrier, constructing a sequence of the SNRs, and estimating link PER based upon knowledge of encoding and/or interleaving used during transmission, and the sequence of SNRs.

摘要翻译： 公开了一种预测链路链路质量的方法和装置。 该方法包括在一段时间内接收多载波调制信号，估计每个接收到的子载波的SNR，构造SNR的序列，以及基于在传输期间使用的编码和/或交织的知识来估计链路PER，以及 SNR序列。

公开(公告)号：US20060073802A1

公开(公告)日：2006-04-06

申请号：US10952620

申请日：2004-09-29

申请人： Sujai Chari ,  Rajeev Krishnomoorthy

发明人： Sujai Chari ,  Rajeev Krishnomoorthy

IPC分类号： H04B1/06

CPC分类号： H04B7/084 ,  H04B7/0871

摘要： Embodiments of methods of receiving transmitted signals are disclosed. The methods include a first antenna receiving a second signal, a second antenna receiving a second signal, adjusting a phase relationship between the first signal and the second signal, combining the phase adjusted first signal and second signal, and processing the phase adjusted first signal and second signal to determine the phase adjustment for optimizing at least one of signal to noise ratio and signal to interference ratio of the combined signals.

摘要翻译： 公开了接收发射信号的方法的实施例。 所述方法包括接收第二信号的第一天线，接收第二信号的第二天线，调整第一信号和第二信号之间的相位关系，组合相位调整的第一信号和第二信号，以及处理相位调整的第一信号和 确定用于优化组合信号的信噪比和信号与干扰比中的至少一个的相位调整的第二信号。

公开(公告)号：US20060013259A1

公开(公告)日：2006-01-19

申请号：US10893810

申请日：2004-07-19

申请人： Sujai Chari ,  Rajeev Krishnamoorthy

发明人： Sujai Chari ,  Rajeev Krishnamoorthy

IPC分类号： H04J1/00

CPC分类号： H04L27/2602 ,  H04B1/71632

摘要： Embodiments of transmission data stream pre-processing are disclosed. A method includes receiving the data stream for transmission, forming blocks of samples from the data stream, inverse Fourier transforming the blocks of samples forming multi-carrier signal symbols, selecting sets of k multi-carrier signal symbols and time expanding each of the sets of the k multi-carrier signal symbols into sets of n multi-carrier signal symbols, where n is greater than k, and transmitting each of the n multi-carrier signal symbols. The time expansion can be accomplished by coding the coding the sets of k multi-carrier signal symbols.

摘要翻译： 公开了传输数据流预处理的实施例。 一种方法包括接收用于传输的数据流，从数据流中形成样本块，对形成多载波信号符号的样本块进行逆傅立叶变换，选择k个多载波信号符号集合，并扩展每组的 k个多载波信号符号转换为n个多载波信号符号，其中n大于k，并传输n个多载波信号符号中的每一个。 可以通过对k个多载波信号符号的集合进行编码来实现时间扩展。

公开(公告)号：US20090185599A1

公开(公告)日：2009-07-23

申请号：US12009712

申请日：2008-01-22

申请人： Sujai Chari

发明人： Sujai Chari

IPC分类号： H04B1/00 ,  H04B1/10

CPC分类号： H04B1/715 ,  H04B1/719 ,  H04B2001/7154

摘要： Methods of adjusting a transmit time of a wireless device are disclosed. One method includes a receiver determining a frequency hopping sequence of an interfering signal. The receiver obtains an observed pattern of at least one of time and frequency overlap between the interfering signal and a signal of interest. The receiver determines a desired pattern of at least one of time and frequency overlap between the interfering signal and the signal of interest. A desired transmit time delay of the signal of interest is adjusted based on a difference between the observed pattern and the desired pattern.

摘要翻译： 公开了调整无线设备的发送时间的方法。 一种方法包括确定干扰信号的跳频序列的接收机。 接收器获得干扰信号和感兴趣信号之间的时间和频率重叠中的至少一个的观察模式。 接收机确定干扰信号和感兴趣的信号之间的时间和频率重叠中的至少一个的期望模式。 基于观察到的图案和期望图案之间的差异来调整感兴趣信号的期望的发送时间延迟。

公开(公告)号：US20090003234A1

公开(公告)日：2009-01-01

申请号：US12231564

申请日：2008-09-04

申请人： Dengwei Fu ,  Sujai Chari ,  Mohan Ramasudha Karnam

发明人： Dengwei Fu ,  Sujai Chari ,  Mohan Ramasudha Karnam

IPC分类号： G06F11/00

CPC分类号： H04L27/2647 ,  H04B1/71637 ,  H04L1/0001 ,  H04L1/203

摘要： A method and apparatus of predicting link quality of a link is disclosed. The method includes receiving multi-carrier modulated signals over a period of time, estimating an SNR for each received sub-carrier, constructing a sequence of the SNRs, and estimating link PER based upon knowledge of encoding and/or interleaving used during transmission, and the sequence of SNRs.

摘要翻译： 公开了一种预测链路链路质量的方法和装置。 该方法包括在一段时间内接收多载波调制信号，估计每个接收到的子载波的SNR，构造SNR的序列，以及基于在传输期间使用的编码和/或交织的知识来估计链路PER，以及 SNR序列。

公开(公告)号：US07430163B2

公开(公告)日：2008-09-30

申请号：US10893810

申请日：2004-07-19

申请人： Sujai Chari ,  Rajeev Krishnomoorthy

发明人： Sujai Chari ,  Rajeev Krishnomoorthy

IPC分类号： H04J11/00 ,  H04J1/00 ,  H04B1/00 ,  H04K1/10

CPC分类号： H04L27/2602 ,  H04B1/71632

摘要： Embodiments of transmission data stream pre-processing are disclosed. A method includes receiving the data stream for transmission, forming blocks of samples from the data stream, inverse Fourier transforming the blocks of samples forming multi-carrier signal symbols, selecting sets of k multi-carrier signal symbols and time expanding each of the sets of the k multi-carrier signal symbols into sets of n multi-carrier signal symbols, where n is greater than k, and transmitting each of the n multi-carrier signal symbols. The time expansion can be accomplished by coding the coding the sets of k multi-carrier signal symbols.

摘要翻译： 公开了传输数据流预处理的实施例。 一种方法包括接收用于传输的数据流，从数据流中形成样本块，对形成多载波信号符号的样本块进行逆傅立叶变换，选择k个多载波信号符号集合，并扩展每组的 k个多载波信号符号转换为n个多载波信号符号，其中n大于k，并传输n个多载波信号符号中的每一个。 可以通过对k个多载波信号符号的集合进行编码来实现时间扩展。

公开(公告)号：US20070211641A1

公开(公告)日：2007-09-13

申请号：US11374550

申请日：2006-03-13

申请人： Dengwei Fu ,  Sujai Chari ,  Mohan Karnam

发明人： Dengwei Fu ,  Sujai Chari ,  Mohan Karnam

IPC分类号： H04L12/26 ,  H04J3/14 ,  H04J1/16 ,  H04L1/00 ,  H04J11/00

CPC分类号： H04L27/2647 ,  H04B1/71637 ,  H04L1/0001 ,  H04L1/203

摘要： A method and apparatus of predicting link quality of a link is disclosed. The method includes receiving multi-carrier modulated signals over a period of time, estimating an SNR for each received sub-carrier, constructing a sequence of the SNRs, and estimating link PER based upon knowledge of encoding and/or interleaving used during transmission, and the sequence of SNRs.

摘要翻译： 公开了一种预测链路链路质量的方法和装置。 该方法包括在一段时间内接收多载波调制信号，估计每个接收到的子载波的SNR，构造SNR的序列，以及基于在传输期间使用的编码和/或交织的知识来估计链路PER，以及 SNR序列。

公开(公告)号：US07113491B2

公开(公告)日：2006-09-26

申请号：US10050128

申请日：2002-01-18

申请人： Michael J. Graziano ,  Sujai Chari

发明人： Michael J. Graziano ,  Sujai Chari

IPC分类号： H04B3/20

CPC分类号： H04L25/4975 ,  H04L1/0001 ,  H04L1/0002 ,  H04L5/023 ,  H04L5/1446 ,  Y02D50/10

摘要： The present invention provides methods and systems for providing efficient use of available CPU cycles that may be achieved by reducing the length of the echo canceller filter. An echo canceller's adaptive algorithm may be implemented to reach a lower mean squared error due to the increased training time allowed by cycle reduction. Total power consumption of a processor may be reduced by reducing the number of multiplications (and/or other operations) that may be performed by an echo canceller filter for each time iteration. This may be achieved by not performing multiplications on taps that are not being used. For higher rates, a shorter echo canceller filter may be implemented by transmitting less energy in low frequencies. As a result, the temporal length of the echo channel may be shortened thereby reducing the total number of taps needed to model the channel. The present invention may further enhance performance by reducing CPU cycles and allowing for more echo canceller training time.