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1.发明授权Radar detection and dynamic frequency selection for wireless local area networks 有权无线局域网的雷达检测和动态频率选择公开(公告)号：US06697013B2
公开(公告)日：2004-02-24
申请号：US10039451
申请日：2001-12-31
IPC分类号： G01S1386
摘要： A system for detecting and avoiding interference with radar signals in wireless network devices is described. The receiver circuit of the device receives incoming 5 GHz traffic. Such traffic could comprise both WLAN traffic as well as radar signals from radar systems. The incoming packets are treated as an input event, and are screened to be examined as radar pulses. Radar pulses are identified using the length of the detected event. The radar pulses are examined using frequency domain analysis, and the packet train is examined to find gaps between radar pulses. The periodic nature of the packet is determined using frequency domain and time domain analysis to calculate the period of the pulse train. Particular intervals within the pulse train are analyzed using threshold numbers of periodic pulses within the interval and threshold power levels for the pulses. The calculated period information is used to identify the radar source and screen non-radar traffic.
摘要翻译： 描述了一种用于在无线网络设备中检测和避免对雷达信号的干扰的系统。 设备的接收机电路接收5 GHz流量。 这样的业务可以包括WLAN业务以及来自雷达系统的雷达信号。 输入的数据包被视为输入事件，并被筛选为雷达脉冲。 使用检测到的事件的长度来识别雷达脉冲。 使用频域分析检查雷达脉冲，并检查分组列，以发现雷达脉冲之间的间隙。 使用频域和时域分析确定分组的周期性，以计算脉冲序列的周期。 使用脉冲间隔内的周期性脉冲的阈值数和脉冲的阈值功率电平来分析脉冲串内的特定间隔。 计算的周期信息用于识别雷达源和屏幕非雷达流量。
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公开(公告)号：US20070064745A1
公开(公告)日：2007-03-22
申请号：US11601535
申请日：2006-11-17
申请人： Chaohuang Zeng , William McFarland
发明人： Chaohuang Zeng , William McFarland
IPC分类号： H04J3/06
CPC分类号： H04W56/0085 , H04L7/042 , H04L69/22 , H04W24/00
摘要： A system and method are disclosed for dynamic preamble detection. A subset of the bits comprising the synchronization portion of the preamble are decoded, de-scrambled, and analyzed to determine dynamically which preamble format is being used. The source data values for the synchronization bits for a first preamble format are different than the source data values for the synchronization bits for a second preamble format and the receiving system uses the difference to determine which preamble format has been used. The information concerning which format has been used may be used to extend a synchronization operation.
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公开(公告)号：US20070086423A1
公开(公告)日：2007-04-19
申请号：US11605502
申请日：2006-11-28
申请人： Chaohuang Zeng , William McFarland
发明人： Chaohuang Zeng , William McFarland
IPC分类号： H04J3/24
摘要： A modified approach to detecting the start frame delimiter (SFD) is disclosed. A receiving system scans a decoded but not yet de-scrambled received signal for a scrambled version of the SFD associated with the preamble format being used. Using this approach, it is not necessary to use any bits intended for use in synchronization to initialize a de-scrambler so as to be able to de-scramble the SFD portion of the preamble for detection. The bits that otherwise would have been dedicated to initializing the de-scrambler may then be used for synchronization, as intended. Detecting fewer than all bits comprising a start frame delimiter is described. Bits not used for SFD detection may be used for other purposes, such as synchronization.
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公开(公告)号：US07764664B2
公开(公告)日：2010-07-27
申请号：US11605502
申请日：2006-11-28
申请人： Chaohuang Zeng , William McFarland
发明人： Chaohuang Zeng , William McFarland
IPC分类号： H04J3/24
摘要： A modified approach to detecting the start frame delimiter (SFD) is disclosed. A receiving system scans a decoded but not yet de-scrambled received signal for a scrambled version of the SFD associated with the preamble format being used. Using this approach, it is not necessary to use any bits intended for use in synchronization to initialize a de-scrambler so as to be able to de-scramble the SFD portion of the preamble for detection. The bits that otherwise would have been dedicated to initializing the de-scrambler may then be used for synchronization, as intended. Detecting fewer than all bits comprising a start frame delimiter is described. Bits not used for SFD detection may be used for other purposes, such as synchronization.
摘要翻译： 公开了一种用于检测起始帧定界符（SFD）的修改方法。 接收系统扫描已解码但尚未去加扰的接收信号，以便与正在使用的前同步码格式相关联的SFD的加扰版本。 使用这种方法，不需要使用旨在同步使用的任何位来初始化解扰器，以便能够去除用于检测的前同步码的SFD部分。 否则将专门用于初始化解扰器的位然后可以用于同步，如预期的那样。 描述检测少于包括起始帧分隔符的所有位的检测。 不用于SFD检测的位可用于其他目的，如同步。
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公开(公告)号：US07161955B1
公开(公告)日：2007-01-09
申请号：US10139653
申请日：2002-05-03
申请人： Chaohuang Zeng , William McFarland
发明人： Chaohuang Zeng , William McFarland
IPC分类号： H04J3/16
摘要： A modified approach to detecting the start frame delimiter (SFD) is disclosed. A receiving system scans a decoded but not yet de-scrambled received signal for a scrambled version of the SFD associated with the preamble format being used. Using this approach, it is not necessary to use any bits intended for use in synchronization to initialize a de-scrambler so as to be able to de-scramble the SFD portion of the preamble for detection. The bits that otherwise would have been dedicated to initializing the de-scrambler may then be used for synchronization, as intended. Detecting fewer than all bits comprising a start frame delimiter is described. Bits not used for SFD detection may be used for other purposes, such as synchronization.
摘要翻译： 公开了一种用于检测起始帧定界符（SFD）的修改方法。 接收系统扫描已解码但尚未去加扰的接收信号，以便与正在使用的前同步码格式相关联的SFD的加扰版本。 使用这种方法，不需要使用旨在同步使用的任何位来初始化解扰器，以便能够去除用于检测的前同步码的SFD部分。 否则将专门用于初始化解扰器的位然后可以用于同步，如预期的那样。 描述检测少于包括起始帧分隔符的所有位的检测。 不用于SFD检测的位可用于其他目的，如同步。
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公开(公告)号：US20070280185A1
公开(公告)日：2007-12-06
申请号：US11768783
申请日：2007-06-26
申请人： William McFarland , Keith Onedera , Arie Shor , David Su , Manolis Terrovitis , John Thomson , Masoud Zaragari
发明人： William McFarland , Keith Onedera , Arie Shor , David Su , Manolis Terrovitis , John Thomson , Masoud Zaragari
IPC分类号： H04L12/56
CPC分类号： H04W88/06 , H03H7/0153 , H03H7/48 , H04B7/0602 , H04B7/0805 , H04W84/12
摘要： A dual band radio is constructed using a primary and secondary transceiver. The primary transceiver is a complete radio that is operational in a stand alone configuration. The secondary transceiver is a not a complete radio and is configured to re-use components such as fine gain control and fine frequency stepping of the primary transceiver to produce operational frequencies of the secondary transceiver. The primary transceiver acts like an intermediate frequency device for the secondary transceiver. Switches are utilized to divert signals to/from the primary transceiver from/to the secondary transceiver. The switches are also configured to act as gain control devices. Antennas are selected using either wideband or narrowband antenna switches that are configured as a diode bridge having high impedance at operational frequencies on control lines that bias the diodes.
摘要翻译： 使用主要和次要收发器构建双频无线电。 主收发器是在独立配置中可操作的完整无线电。 辅助收发器不是完整的无线电设备，并被配置为重新使用诸如主收发器的精细增益控制和精细频率步进的组件来产生次级收发器的操作频率。 主收发器像次级收发器的中频设备一样工作。 开关用于将信号从/从主收发器转发到/从辅助收发器。 开关还被配置为用作增益控制装置。 使用宽带或窄带天线开关选择天线，该开关被配置为在偏置二极管的控制线上的工作频率处具有高阻抗的二极管桥。
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公开(公告)号：US06961545B2
公开(公告)日：2005-11-01
申请号：US09832029
申请日：2001-04-09
CPC分类号： H04L1/1893 , H04B7/061 , H04B7/0814 , H04B7/0825 , H04L1/0001 , H04L1/0015 , H04L1/06 , H04W84/12
摘要： An antenna switch diversity algorithm, and systems and methods to provide antenna diversity by implementing the algorithm in, for example, an IEEE 802.11a compliant environment, are presented. In accordance with the algorithm, one antenna of at least two antennas is designated as a default antenna at a communications device that sends and receives transmit and receive packets. The default antenna designation is changed depending on long-term and short-term learning processes implemented in, for example, software and hardware. The long-term and short-term learning processes analyze packet transmission and reception results of the antennas. The antenna switch diversity algorithm is applicable to multiple antennas.
摘要翻译： 提出了一种天线开关分集算法，以及通过在例如符合IEEE 802.11a的环境中实现该算法来提供天线分集的系统和方法。 根据该算法，在发送和接收发送和接收分组的通信设备处将至少两个天线的一个天线指定为默认天线。 根据在例如软件和硬件中实现的长期和短期学习过程，默认的天线指定被改变。 长期和短期学习过程分析天线的分组发送和接收结果。 天线切换分集算法适用于多个天线。
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公开(公告)号：US20050157744A1
公开(公告)日：2005-07-21
申请号：US10760024
申请日：2004-01-15
申请人： Craig Barratt , William McFarland
发明人： Craig Barratt , William McFarland
IPC分类号： H04L12/28 , H04L12/413
CPC分类号： H04W74/0816 , H04W74/08 , H04W84/12
摘要： A system and method are described for reducing data transmission collisions in a shared transmission medium. In one embodiment, transmission priorities are set by means of priority-defining transmissions. In another embodiment, statistically equal access is assured by means of unique transmit start time slot pairs wherein the paired start time slots are substantially equally spaced in time from a center start time slot. In yet another embodiment, data transmission traffic analysis is used to set unique transmission start time slots or to select from pools of start time slots associated with classes of data to be transmitted, thus establishing relative preemption priorities. In still another embodiment, transmission begins in statically assigned start time slots that are subsets of an available array of transmission start time slots.
摘要翻译： 描述了用于减少共享传输介质中的数据传输冲突的系统和方法。 在一个实施例中，通过优先级定义传输来设置传输优先级。 在另一个实施例中，通过独特的发送开始时隙对来确保统计上相等的接入，其中成对的起始时隙在时间上与中心开始时隙基本相等地间隔开。 在另一个实施例中，数据传输业务分析用于设置唯一的传输开始时隙或者从与要发送的数据类别相关联的开始时隙的池中进行选择，从而建立相对抢占优先级。 在另一个实施例中，传输在静态分配的开始时隙开始，这些时隙是可用传输开始时隙阵列的子集。
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9.发明授权In-band and out-of-band signal detection for automatic gain calibration systems 有权自动增益校准系统的带内和带外信号检测公开(公告)号：US06721547B2
公开(公告)日：2004-04-13
申请号：US09849442
申请日：2001-05-04
IPC分类号： H04B1700
CPC分类号： H04B1/109 , H03G5/165 , H04B1/1036
摘要： An embodiment of the present invention provides an automatic gain control system for a wireless receiver that quickly differentiates desired in-band signals from high power out-of-band signals that overlap into the target band. The system measures power before and after passing a received signal through a pair of finite impulse response filters that largely restrict the signal's power to that which is in-band. By comparing the in-band energy of the received signal after filtering to the total signal energy prior to filtering, it is possible to determine whether a new in-band signal has arrived. The presence of this new in-band signal is then verified by a multi-threshold comparison of the normalized self-correlation to verify the presence of a new, desired in-band signal.
摘要翻译： 本发明的实施例提供了一种用于无线接收机的自动增益控制系统，其快速地将期望的带内信号与重叠到目标频带中的高功率带外信号区分开来。 该系统通过一对有限的脉冲响应滤波器测量接收信号之前和之后的功率，这些有限脉冲响应滤波器将信号功率大大限制在带内。 通过将滤波后的接收信号的带内能量与滤波前的总信号能量进行比较，可以确定是否已经到达了新的带内信号。 然后通过归一化自相关的多阈值比较来验证这个新的带内信号的存在，以验证新的期望的带内信号的存在。
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公开(公告)号：US20070274407A1
公开(公告)日：2007-11-29
申请号：US11621940
申请日：2007-01-10
申请人： John Thomson , Paul Husted , Ardavan Tehrani , Jeffrey Gilbert , William McFarland , Lars Thon , Yi-Hsiu Wang
发明人： John Thomson , Paul Husted , Ardavan Tehrani , Jeffrey Gilbert , William McFarland , Lars Thon , Yi-Hsiu Wang
CPC分类号： H04L25/067 , H03M13/25 , H03M13/3961 , H03M13/41 , H03M13/6325 , H03M13/6362 , H04K3/228 , H04L1/005 , H04L1/0054 , H04L27/38
摘要： A Viterbi decoding system interprets bits in received QAM constellations as many-valued parameters rather than binary valued parameters. It performs the Viterbi algorithm using these many-valued parameters to provide results superior to hard decision decoding. Rather than applying a hard 0-1 function to the QAM data, the system uses a non-stepped linear or curved transfer function to assign values to the bits. In another aspect, a system differentiates between data bits based on their estimated reliability, giving more emphasis to decoding reliable bits than unreliable bits using any of a variety of techniques. By differentiating between god and bad bits and de-emphasizing or ignoring unreliable bits, the system can provide a significant reduction in uncorrectable errors and packet loss.
摘要翻译： 维特比解码系统将接收的QAM星座中的比特解释为多值参数，而不是二进制值参数。 它使用这些多值参数来执行维特比算法，以提供优于硬判决解码的结果。 系统使用非阶梯线性或弯曲传递函数来向位指定值，而不是将硬0-1函数应用于QAM数据。 在另一方面，一种系统基于其估计的可靠性来区分数据比特，更多地强调使用各种技术中的任何一种来解码可靠比特比不可靠比特。 通过区分神和坏位，并且不强调或忽略不可靠比特，系统可以显着减少不可校正的错误和分组丢失。
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