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1. 发明授权

US08923431B2 Multi-carrier communication systems employing variable symbol rates and number of carriers 有权
标题翻译：采用可变符号率和载波数量的多载波通信系统
公开(公告)号：US08923431B2
公开(公告)日：2014-12-30
申请号：US12409404
申请日：2009-03-23
申请人： William J. McFarland
发明人： William J. McFarland
IPC分类号： H04L27/00 , H04L1/00 , H04L5/00 , H04L27/26 , H04L25/02
CPC分类号： H04W28/0231 , H04L1/0002 , H04L1/0017 , H04L1/0025 , H04L1/0026 , H04L1/0034 , H04L1/20 , H04L5/0007 , H04L5/003 , H04L5/0046 , H04L5/006 , H04L5/0064 , H04L25/0224 , H04L25/08 , H04L27/2602 , H04L27/2608 , H04L27/2613 , H04L27/2626 , H04L27/2628
摘要： A multi-carrier communication system such as an OFDM or DMT system has nodes which are allowed to dynamically change their receive and transmit symbol rates, and the number of carriers within their signals. Changing of the symbol rate is done by changing the clocking frequency of the nodes' iFFT and FFT processors, as well as their serializers and deserializers. The nodes have several ways of dynamically changing the number of carriers used. The selection of symbol rate and number of carriers can be optimized for a given channel based on explicit channel measurements, a priori knowledge of the channel, or past experience. Provision is made for accommodating legacy nodes that may have constraints in symbol rate or the number of carriers they can support. The receiver can determine the correct symbol rate and number of carriers through a priori knowledge, a first exchange of packets in a base mode that all nodes can understand, or an indication in the header of the data packet which is transmitted in a base mode of operation that all nodes can understand.
摘要翻译：诸如OFDM或DMT系统的多载波通信系统具有被允许动态地改变其接收和发送符号率的节点以及它们的信号内的载波数量。通过改变节点iFFT和FFT处理器的时钟频率，以及它们的串行器和解串器来改变符号速率。节点具有动态地改变所使用的载波数量的几种方式。可以基于明确的信道测量，信道的先验知识或过去的经验，针对给定信道优化符号速率和载波数量的选择。规定了用于容纳可能具有符号率限制或可支持的运营商数量的传统节点。接收机可以通过先验知识确定正确的符号速率和载波数，以所有节点可以理解的基本模式的分组的第一次交换，或以基本模式发送的数据分组的报头中的指示所有节点都可以理解的操作。

2. 发明授权

US08416866B1 System and method for reducing phase errors in multiple sub-carrier communication systems 有权
标题翻译：用于减少多个子载波通信系统中的相位误差的系统和方法
公开(公告)号：US08416866B1
公开(公告)日：2013-04-09
申请号：US12512273
申请日：2009-07-30
申请人： Hao-Ren Cheng , Kuang-Chung Ou , William J McFarland
发明人： Hao-Ren Cheng , Kuang-Chung Ou , William J McFarland
IPC分类号： H04K1/10
CPC分类号： H04L27/2675 , H04L25/0204 , H04L25/0224 , H04L25/03012 , H04L27/2657 , H04L27/2695 , H04L2025/03414 , H04L2025/03636
摘要： This disclosure is directed to systems and methods that compensate for a phase change that results from a change in RF gain, a “phase glitch,” that would otherwise degrade the performance of a multiple sub-carrier communication system, such as OFDM. Pilot symbols are used to estimate the phase change, allowing the pilot and data symbols to be compensated by the estimated phase change. Preferably, the compensated pilots are used to per form a second iteration of phase change estimation that determines residual phase glitch. Thus, following the second estimation of phase change, data symbols can be compensated for the estimated residual phase change.
摘要翻译：该公开内容涉及补偿由增益（即相位毛刺）引起的相位变化的系统和方法，否则会降低诸如OFDM的多子载波通信系统的性能。导频符号用于估计相位变化，允许通过估计的相位变化来补偿导频和数据符号。优选地，补偿导频用于形成确定剩余相位毛刺的相位变化估计的第二迭代。因此，在相位改变的第二估计之后，可以对估计的残余相位变化补偿数据符号。

3. 发明申请

US20120269170A1 Synchronization-Free Station Locator In Wireless Network 有权
标题翻译：无线网络中的无同步站定位器
公开(公告)号：US20120269170A1
公开(公告)日：2012-10-25
申请号：US13541635
申请日：2012-07-03
申请人： Qifan Chen , Ning Zhang , James Cho , William J. McFarland
发明人： Qifan Chen , Ning Zhang , James Cho , William J. McFarland
IPC分类号： H04W24/00 , H04W36/08 , H04W72/04
CPC分类号： H04J3/0667 , G01S5/14 , G01S13/878
摘要： A method of providing synchronization-free station locating in a wireless network is provided. In this method, an AP having a known location sends a unicast packet to the station and notes its time of departure TOD(D). The station receives the unicast packet, notes its time of arrival TOA(D), sends an acknowledgement packet to the AP, and notes its time of departure TOD(D_ACK). The AP receives the acknowledgment packet and notes its time of arrival TOA(D_ACK). Notably, a distance between the AP and the station can be accurately determined using a first difference between the TOA(D_ACK) and the TOD(D) and a second difference between the TOD(D_ACK) and the TOA(D). A plurality of such computed distances between a plurality of APs and the station can be used to determine an accurate location of the station.
摘要翻译：提供了一种在无线网络中提供无同步电台定位的方法。在该方法中，具有已知位置的AP向站发送单播分组，并注意其出发时间TOD（D）。站点接收单播包，注意其到达时间TOA（D），向AP发送确认包，并记录其出发时间TOD（D_ACK）。 AP接收到确认包，并记录其到达时间TOA（D_ACK）。值得注意的是，可以使用TOA（D_ACK）和TOD（D）之间的第一差异和TOD（D_ACK）和TOA（D）之间的第二差异来精确地确定AP与站之间的距离。可以使用多个AP和站之间的多个这样计算的距离来确定站的精确位置。

4. 发明授权

US08233457B1 Synchronization-free station locator in wireless network 有权
标题翻译：无线同步无线站定位器
公开(公告)号：US08233457B1
公开(公告)日：2012-07-31
申请号：US12553757
申请日：2009-09-03
申请人： Qifan Chen , Ning Zhang , James Cho , William J. McFarland
发明人： Qifan Chen , Ning Zhang , James Cho , William J. McFarland
IPC分类号： H04W4/00 , H04W24/00 , H04J3/00 , H04J3/16
CPC分类号： H04J3/0667 , G01S5/14 , G01S13/878
摘要： A method of providing synchronization-free station locating in a wireless network is provided. In this method, an AP having a known location sends a unicast packet to the station and notes its time of departure TOD(D). The station receives the unicast packet, notes its time of arrival TOA(D), sends an acknowledgement packet to the AP, and notes its time of departure TOD(D_ACK). The AP receives the acknowledgment packet and notes its time of arrival TOA(D_ACK). Notably, a distance between the AP and the station can be accurately determined using a first difference between the TOA(D_ACK) and the TOD(D) and a second difference between the TOD(D_ACK) and the TOA(D). A plurality of such computed distances between a plurality of APs and the station can be used to determine an accurate location of the station.
摘要翻译：提供了一种在无线网络中提供无同步电台定位的方法。在该方法中，具有已知位置的AP向站发送单播分组，并注意其出发时间TOD（D）。站点接收单播包，注意其到达时间TOA（D），向AP发送确认包，并记录其出发时间TOD（D_ACK）。 AP接收到确认包，并记录其到达时间TOA（D_ACK）。值得注意的是，可以使用TOA（D_ACK）和TOD（D）之间的第一差异和TOD（D_ACK）和TOA（D）之间的第二差异来精确地确定AP与站之间的距离。可以使用多个AP和站之间的多个这样计算的距离来确定站的精确位置。

5. 发明申请

US20120093240A1 INTERFERENCE DETECTION IN A POWERLINE COMMUNICATION NETWORK 审中-公开
标题翻译：电力通信网络中的干扰检测
公开(公告)号：US20120093240A1
公开(公告)日：2012-04-19
申请号：US13008554
申请日：2011-01-18
申请人： William J. McFarland , Srinivas Katar , Lawrence W. Yonge, III
发明人： William J. McFarland , Srinivas Katar , Lawrence W. Yonge, III
IPC分类号： H04B3/00
CPC分类号： H04B3/54 , H04B2203/5495
摘要： A powerline communication (PLC) network can be subject to noise/interference resulting in loss of throughput and data corruption for PLC devices connected to the PLC network. A powerline interference analyzer can be implemented in the PLC network for detecting sources of the noise. The powerline interference analyzer can determine powerline network noise characteristics that are representative of noise on the PLC network and can analyze the powerline network noise characteristics to determine one or more noise patterns. The noise patterns can be compared with a plurality of predefined noise signatures that are representative of corresponding each of a plurality of noise sources. Consequently, at least one noise source that is associated with the noise patterns can be identified from the plurality of the noise sources.
摘要翻译：电力线通信（PLC）网络可能受到噪声/干扰，导致连接到PLC网络的PLC设备的吞吐量和数据损坏丢失。电力线干扰分析仪可以在PLC网络中实现，用于检测噪声源。电力线干扰分析仪可以确定代表PLC网络噪声的电力线网络噪声特性，并可以分析电力线网络噪声特性，以确定一个或多个噪声模式。可以将噪声模式与表示多个噪声源中的每一个的多个预定噪声特征进行比较。因此，可以从多个噪声源识别与噪声模式相关联的至少一个噪声源。

6. 发明授权

US08160515B1 Negative amplitude polar transmitter 失效
公开(公告)号：US08160515B1
公开(公告)日：2012-04-17
申请号：US12110236
申请日：2008-04-25
申请人： Paul J. Husted , David J. Weber , William J. McFarland , William W. Si
发明人： Paul J. Husted , David J. Weber , William J. McFarland , William W. Si
IPC分类号： H03C1/62 , H04B17/00
CPC分类号： H03C5/00 , H03C1/62 , H03F3/24 , H03F2200/324 , H04B2001/0408
摘要： A polar transmitter includes a phase monitoring unit for monitoring input modulating data. When a phase transition exceeds a phase transition threshold, the phase monitor unit can signal an amplitude negation unit to invert the amplitude data coupled to the polar amplifier. The phase monitoring unit can also add an offset to the phase data that is provided to a frequency synthesizer. In another embodiment, when the phase transition threshold is exceeded, the phase monitoring unit can trigger inverting differential frequency data coupled to the polar amplifier. In one embodiment, the phase offset and the amplitude negation are applied until a second phase transition value exceeding the phase transition threshold is detected. If such an event is detected, then the input amplitude data is no longer inverted and the phase offset value is no longer added to the modulating data.

7. 发明授权

US07865150B2 Dual frequency band wireless LAN 有权
标题翻译：双频无线局域网
公开(公告)号：US07865150B2
公开(公告)日：2011-01-04
申请号：US11768783
申请日：2007-06-26
申请人： William J. McFarland , Keith K. Onodera , Arie Shor , David K. Su , Manolis Terrovitis , John S. Thomson , Masoud Zaragari
发明人： William J. McFarland , Keith K. Onodera , Arie Shor , David K. Su , Manolis Terrovitis , John S. Thomson , Masoud Zaragari
IPC分类号： H04B1/44
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。

8. 发明授权

US07792052B1 Method and system for testing and optimizing the performance of a radio communication device 有权
标题翻译：用于测试和优化无线电通信设备的性能的方法和系统
公开(公告)号：US07792052B1
公开(公告)日：2010-09-07
申请号：US12236818
申请日：2008-09-24
申请人： John S. Thomson , William J. McFarland
发明人： John S. Thomson , William J. McFarland
IPC分类号： H04J1/16
CPC分类号： H04L25/022 , H04L5/005 , H04L25/0224 , H04L27/2659 , H04L27/266 , H04L27/2662 , H04L27/2695
摘要： A radio communication device is tested by forwarding relevant signal characteristic data derived at the physical (PHY) layer to the media access control (MAC) layer for processing, analysis and feedback to the radio circuit to improve performance. The relevant signal characteristics are forwarded to the MAC within (appended to) a data packet. Thus, the relevant signal characteristic is forwarded to the MAC along an existing data path (a path originally designed to transfer the receive frame only, but now transfers the combined receive frame with the attached radio characteristic). The radio characteristic may be used for testing and/or tuning the radio circuit. In one embodiment, the radio characteristic is a frequency domain representation of a received signal. The radio is tuned based on a channel estimate derived from comparison of frequency domain representations of transmitted and received signals.
摘要翻译：通过将在物理（PHY）层导出的相关信号特征数据转发到媒体访问控制（MAC）层来进行无线电通信设备的测试，以对无线电电路进行处理，分析和反馈以提高性能。相关信号特性被转发到数据包（附加到）内的MAC。因此，相关信号特性沿着现有数据路径（最初设计用于传送接收帧的路径，但是现在传输具有附加的无线电特征的组合的接收帧）被转发到MAC。无线电特性可用于测试和/或调谐无线电电路。在一个实施例中，无线电特性是接收信号的频域表示。基于从发送和接收信号的频域表示的比较导出的信道估计来调谐无线电。

9. 发明授权

US07606193B2 Methods for implementing a dynamic frequency selection (DFS) feature for WLAN devices 有权
标题翻译：实现WLAN设备的动态频率选择（DFS）功能的方法
公开(公告)号：US07606193B2
公开(公告)日：2009-10-20
申请号：US10406049
申请日：2003-04-02
申请人： William J. McFarland , Michael R. Green
发明人： William J. McFarland , Michael R. Green
IPC分类号： H04Q7/00
CPC分类号： H04L1/22 , G01S7/021 , H04L5/06 , H04L63/162 , H04W16/14 , H04W24/00 , H04W24/04 , H04W36/06 , H04W72/02 , H04W84/12
摘要： Various regulatory domains promulgate standards to define how wireless devices should operate in certain frequency bands. The 5 GHz spectrum is of particular importance to certain regulatory domains because of radar systems also operating in this spectrum. To avoid interference with such radar systems, wireless devices operating in this spectrum should be able to detect radar and quickly vacate any channels currently used by the radar systems. Techniques are provided for performing startup scans for radar, identifying backup channels for a possible channel switch, and efficiently changing channels in the event of radar detection in the operating channel. These techniques advantageously meet current regulatory standards governing DFS while minimizing network startup delays and disruption to users during a radar event.
摘要翻译：各种监管领域公布了无线设备如何在某些频段中运行的标准。 5 GHz频谱对某些监管领域尤其重要，因为雷达系统也在这一频谱范围内运行。为了避免对这种雷达系统的干扰，在该频谱中工作的无线设备应能够检测雷达并迅速腾出雷达系统当前使用的任何通道。提供技术用于执行雷达的启动扫描，识别可能的信道切换的备用信道，以及在操作信道中雷达检测的情况下有效地改变信道。这些技术有利地满足管理DFS的当前管制标准，同时在雷达事件期间最小化网络启动延迟和用户中断。

10. 发明申请

US20090175237A1 Method And Apparatus For Selective Disregard Of Co-Channel Transmissions On A Medium 有权
标题翻译：用于选择性地忽视中间的同频道传输的方法和装置
公开(公告)号：US20090175237A1
公开(公告)日：2009-07-09
申请号：US12402341
申请日：2009-03-11
申请人： Paul J. Husted , William J. McFarland
发明人： Paul J. Husted , William J. McFarland
IPC分类号： H04W72/00 , H04L12/56
CPC分类号： H04W24/00 , H03G3/3068 , H04B1/1027 , H04B17/309 , H04W16/14 , H04W52/0232 , H04W52/0245 , Y02D70/142 , Y02D70/20 , Y02D70/40
摘要： A method and apparatus to selectively disregard co-channel transmissions on a medium uses an automatic gain control/clear channel assessment (AGC/CCA) circuit to gather signal power information, which is used to establish receiver sensitivity thresholds. Raw and cyclical power measurements of a received signal are processed by the AGC/CCA circuit to determine whether a current received signal process should be halted, and a new signal acquisition sequence begun.
摘要翻译：选择性地忽略介质上的同频道传输的方法和装置使用自动增益控制/清除信道评估（AGC / CCA）电路来收集用于建立接收机灵敏度阈值的信号功率信息。接收信号的原始和周期功率测量由AGC / CCA电路处理，以确定是否应该停止当前的接收信号处理，并且开始新的信号采集序列。

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