公开(公告)号：US07826860B2

公开(公告)日：2010-11-02

申请号：US12231563

申请日：2008-09-04

申请人： Patrick Worfolk ,  Xiaoming Zhou

发明人： Patrick Worfolk ,  Xiaoming Zhou

IPC分类号： H04B7/00 ,  H04B15/00

CPC分类号： H04W56/002

摘要： A device and method for of synchronizing a MAC superframe of a wireless device is disclosed. The wireless device can be located within a chain of a plurality of other wireless devices. The method includes receiving beacons from at least one other device during a superframe of the wireless device, determining a superframe offset for each of the other wireless devices based on timing of the received beacons, determining a corrective delay based on the superframe offsets, inserting the corrective delay within a current superframe of the wireless device, and inserting a predictive delay within the current superframe, the predictive delay being determined by an estimate of a difference between a frequency a clock of the wireless device and a frequency of a slowest clock of the other wireless devices within the chain.

摘要翻译： 公开了一种用于同步无线设备的MAC超帧的设备和方法。 无线设备可以位于多个其他无线设备的链路内。 该方法包括在无线设备的超帧期间从至少一个其他设备接收信标，基于接收到的信标的定时确定每个其他无线设备的超帧偏移，基于超帧偏移确定校正延迟，插入 在无线设备的当前超帧内的校正延迟，以及在当前超帧内插入预测延迟，所述预测延迟由所述无线设备的时钟频率与所述无线设备的最慢时钟的频率之间的差的估计来确定 链中的其他无线设备。

公开(公告)号：US08014486B2

公开(公告)日：2011-09-06

申请号：US12079471

申请日：2008-03-27

申请人： Adam L. Schwartz

发明人： Adam L. Schwartz

IPC分类号： H03D3/24

CPC分类号： G06F1/022 ,  H03L7/18

摘要： Methods and systems of generating a frequency switching local oscillator signal are disclosed. One method includes generating a reference clock signal, and clocking a counter with the reference clock signal. The counter controls selection of a one of a plurality of analog values stored in at least one of a plurality of periodic signal generators. The frequency switching local oscillator signal is generated by selecting an output of a one of the plurality of periodic signal generators.

摘要翻译： 公开了产生频率切换本地振荡器信号的方法和系统。 一种方法包括产生参考时钟信号，并用参考时钟信号对计数器计时。 计数器控制存储在多个周期信号发生器中的至少一个中的多个模拟值之一的选择。 通过选择多个周期信号发生器之一的输出来产生频率切换本地振荡器信号。

公开(公告)号：US07978748B2

公开(公告)日：2011-07-12

申请号：US12001339

申请日：2007-12-11

申请人： Daryl Arnold Kaiser ,  Sujai Chari

发明人： Daryl Arnold Kaiser ,  Sujai Chari

IPC分类号： H04B1/73

CPC分类号： H04B1/7156 ,  H04B2001/71563 ,  H04L5/0023 ,  H04L5/0037 ,  Y10T137/7838 ,  Y10T137/7904

摘要： Methods and systems of a receiver selecting a subset of plurality of frequency hopping bands for synchronization of the receiver are disclosed. One method includes the receiver determining a receive signal quality metric for each band of the plurality of frequency hopping bands, and selecting at least one synchronization band as a subset of the plurality of frequency hopping bands for synchronization based on the receive signal quality metric of each of the plurality of frequency hopping bands.

摘要翻译： 公开了接收机选择用于接收机同步的多个跳频频带的子集的接收机的方法和系统。 一种方法包括接收机确定多个跳频频带中的每个频带的接收信号质量度量，并且基于每个频带的接收信号质量度量，选择至少一个同步频带作为用于同步的多个跳频频带的子集 的多个跳频带。

公开(公告)号：US08000376B2

公开(公告)日：2011-08-16

申请号：US12009712

申请日：2008-01-22

申请人： Sujai Chari

发明人： Sujai Chari

IPC分类号： H04B1/713 ,  H04K1/10

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：US07623886B2

公开(公告)日：2009-11-24

申请号：US11300089

申请日：2005-12-14

申请人： Ssu-Pin Ma ,  Isaac Sever

发明人： Ssu-Pin Ma ,  Isaac Sever

IPC分类号： H04B7/00

CPC分类号： H04W52/225 ,  H04B17/13 ,  H04W52/52

摘要： A method and apparatus of calibrating a transmitter are disclosed. The method includes attenuating transmitter output signals as controlled by an output control signal, ensuring that an average power of the transmitter output signals is below a threshold level, and performing calibration of the transmitter at periods of time in which the output control signal is attenuating the transmitter output signals a lesser amount. The lesser amount can be less than an average of a minimum amount of attenuation and a maximum amount of attenuation. The apparatus includes a transmitter that includes a frequency up-converting LO mixer for frequency up-converting base band signals, generating transmitter output signals, a transmitter antenna for transmitting the transmitter output signals, and control circuitry for controlling attenuating the transmitter output signals during a calibration of the transmitter.

摘要翻译： 公开了校准发射机的方法和装置。 该方法包括衰减由输出控制信号控制的发射机输出信号，确保发射机输出信号的平均功率低于阈值电平，并且在输出控制信号正在衰减的时间段执行发射机的校准 发射机输出信号的数量较少。 较小的量可以小于最小衰减量和最大衰减量的平均值。 该装置包括发射机，其包括用于频率上变频基带信号的上变频LO混频器，产生发射机输出信号，用于发送发射机输出信号的发射机天线，以及控制电路，用于控制在 变送器的校准。

公开(公告)号：US07733979B2

公开(公告)日：2010-06-08

申请号：US11726288

申请日：2007-03-21

申请人： Adam L. Schwartz ,  James Christopher Arnott

发明人： Adam L. Schwartz ,  James Christopher Arnott

IPC分类号： H04K1/02

CPC分类号： H03F3/24 ,  H03F1/0205 ,  H03F2200/105 ,  H03F2200/393 ,  H03G3/3042 ,  H03G3/3047 ,  H04B2001/0416 ,  H04W52/225 ,  H04W52/287

摘要： A method an apparatus for controlling a transmission signal power level of a transmitter is disclosed. The method includes receiving a root-mean-squared target power level. A duty cycle of a transmission signal is determined that indicates power on and power off periods over a predetermined sensing interval. A transmission signal power level is sensed. The transmission signal power level is adjusted to be approximately equal to the target power level divided by the duty cycle.

摘要翻译： 公开了一种用于控制发射机的发射信号功率电平的装置的方法。 该方法包括接收均方根的目标功率电平。 确定传输信号的占空比，其指示在预定感测间隔上的电源接通和断电时段。 传感信号功率电平被检测。 传输信号功率电平被调整为近似等于目标功率电平除以占空比。

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：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：US07672396B2

公开(公告)日：2010-03-02

申请号：US11472973

申请日：2006-06-22

申请人： Adam L. Schwartz ,  Sujai Chari

发明人： Adam L. Schwartz ,  Sujai Chari

IPC分类号： H04L25/49

CPC分类号： H03D3/009 ,  H03C2200/0058 ,  H04L27/2627 ,  H04L27/364

摘要： Methods of reducing spectral leakage due to I-Q imbalance within a transmitter are disclosed. The method includes the transmitter receiving a data stream of coefficients of a multi-carrier modulation signal. The data stream is pre-processed by processing a set of the coefficients that correspond with selected notch frequencies to reduce the effects of I-Q imbalance of the transmitter, wherein at least a portion of the set of coefficients corresponds to non-symmetrical notch frequencies. The pre-processed data stream is multi-carrier modulated. The multi-carrier modulated pre-processed data stream is I-Q modulated before transmission.

摘要翻译： 公开了减少由于发射机内的I-Q不平衡引起的频谱泄漏的方法。 该方法包括发射机接收多载波调制信号的系数的数据流。 通过处理与所选择的陷波频率相对应的一组系数来预处理数据流，以减少发射机的I-Q不平衡的影响，其中该组系数的至少一部分对应于非对称陷波频率。 预处理的数据流是多载波调制的。 多载波调制预处理数据流在传输之前进行I-Q调制。