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1. 发明授权

US09136937B1 System and method for providing antenna diversity in multiple sub-carrier communication systems 有权
标题翻译：用于在多个子载波通信系统中提供天线分集的系统和方法
公开(公告)号：US09136937B1
公开(公告)日：2015-09-15
申请号：US12706141
申请日：2010-02-16
申请人： Hao-Ren Cheng , William J. McFarland
发明人： Hao-Ren Cheng , William J. McFarland
IPC分类号： H03K9/00 , H03D3/00 , H04B1/44 , H04B7/185 , H04B7/06 , H04B7/08
CPC分类号： H04B7/18545 , H04B7/01 , H04B7/0602 , H04B7/0802 , H04B7/0805 , H04B7/0811 , H04B7/1855
摘要： A system and method to provide antenna diversity by switching between antenna feeds to optimize signal quality. Antenna conditions are determined during an OFDM guard interval to minimize disruption of symbol transmission. When the signal quality assessment determines that an improved signal is available on an alternative antenna, an antenna change is performed to switch to the alternative antenna, also during a GI, again minimizing disruption in information transmission. Preferably, the process is continually applied, so that antenna conditions are monitored for changing conditions and the antenna experiencing the best signal is selected.
摘要翻译：通过在天线馈线之间切换来提供天线分集以优化信号质量的系统和方法。在OFDM保护间隔期间确定天线条件以最小化符号传输的中断。当信号质量评估确定改进的信号在替代天线上可用时，执行天线改变以在GI期间切换到替代天线，同时最小化信息传输的中断。优选地，该过程被连续地应用，使得监视天线条件以改变条件，并且选择经历最佳信号的天线。

2. 发明授权

US08451918B1 System and method for spur estimation and mitigation 失效
标题翻译：刺激估计和减轻的系统和方法
公开(公告)号：US08451918B1
公开(公告)日：2013-05-28
申请号：US12272629
申请日：2008-11-17
申请人： Hao-Ren Cheng , Gaspar Lee , William J. McFarland , Paul J. Husted , Justin Huang
发明人： Hao-Ren Cheng , Gaspar Lee , William J. McFarland , Paul J. Husted , Justin Huang
IPC分类号： H04K1/10
CPC分类号： H04K3/228
摘要： A spur detection and spur cancellation apparatus in a multiple sub-carrier digital communication receiver includes a spur detection block that estimates, using one or more Fourier transforms, a frequency location of a narrowband interference spur in a received digital signal that includes a plurality of sub-carriers, and a spur cancellation block that attenuates the estimated narrowband interference spur. The spur detection block may use a fast Fourier transform (FFT) and/or a discrete Fourier transform (DFT) to locate a frequency and to measure a discrete power spectra of the narrowband interference spur. A channel state information block in the receiver may adjust a channel state information metric based on the located frequency and/or the measured discrete power spectra of the narrowband interference spur.
摘要翻译：多子载波数字通信接收机中的支线检测和杂散消除装置包括一个支线检测块，其使用一个或多个傅里叶变换来估计接收到的数字信号中的窄带干扰杂波的频率位置，所述数字信号包括多个子载波载波，以及减弱估计的窄带干扰刺激的支线消除块。支线检测块可以使用快速傅里叶变换（FFT）和/或离散傅里叶变换（DFT）来定位频率并测量窄带干扰刺激的离散功率谱。接收机中的信道状态信息块可以基于所定义的频率和/或窄带干扰支线的测量离散功率谱来调整信道状态信息度量。

3. 发明授权

US09548832B1 Media streaming synchronization 有权
标题翻译：媒体流同步
公开(公告)号：US09548832B1
公开(公告)日：2017-01-17
申请号：US12820058
申请日：2010-06-21
申请人： James Cho , William J. McFarland , Ning Zhang
发明人： James Cho , William J. McFarland , Ning Zhang
IPC分类号： H04J3/06 , H04N21/43 , H04N21/4363
CPC分类号： H04W56/001 , H04J3/0661 , H04J3/0664 , H04J3/067 , H04N21/4305 , H04N21/43615 , H04N21/43637
摘要： A system and method for closely synchronizing the transmission of real-time data streams is described. Synchronization data is transmitted by a cycle master for receipt by one or more cycle slaves. A cycle slave updates an internal state based on synchronization data received from the cycle master. This internal state may govern reproduction of received real-time data streams by the cycle slave. Such synchronization data may be inserted into transmitted media streams. The cycle slave internal state may be more accurately set by calculating timing differences between the cycle master and cycle slave and periodically adjusting that internal state between receipt of the synchronization data from the cycle master.
摘要翻译：描述了用于紧密同步实时数据流的传输的系统和方法。同步数据由循环主站传送，以便由一个或多个循环从站接收。循环从站根据从循环主站接收的同步数据更新内部状态。该内部状态可以管理由循环从站接收的实时数据流的再现。这样的同步数据可以被插入到所传送的媒体流中。循环从站内部状态可以通过计算循环主站和从站从站之间的定时差异并周期性地调整从循环主站接收到同步数据之间的内部状态来更精确地设置。

4. 再颁专利

USRE45236E1 Multi-channel binding in data transmission 有权
标题翻译：数据传输中的多通道绑定
公开(公告)号：USRE45236E1
公开(公告)日：2014-11-11
申请号：US13231733
申请日：2011-09-13
申请人： Paul J. Husted , William J. McFarland , Jeffrey M. Gilbert
发明人： Paul J. Husted , William J. McFarland , Jeffrey M. Gilbert
IPC分类号： H04J1/00
CPC分类号： H04W74/00 , H04L29/06 , H04L69/14 , H04W28/20
摘要： A system and method are described for binding together a plurality of wireless data communications channels, whereby an aggregate throughput improvement is realized. A master channel amongst the channels to be bound is compatible with existing standards-based wireless data communications equipment. The master channel serves to perform MAC association and flow control. Aggregate throughput is improved by sending and receiving either multiple sets of separately encoded packets, commonly encoded packets or redundantly encoded packets.
摘要翻译：描述了用于将多个无线数据通信信道绑定在一起的系统和方法，从而实现了聚合吞吐量的提高。要绑定的频道中的主频道与现有的基于标准的无线数据通信设备兼容。主信道用于执行MAC关联和流控制。通过发送和接收多组单独编码的数据包（通常是编码数据包或冗余编码数据包）来提高总体吞吐量。

5. 发明授权

US08755756B1 Active cancellation of interference in a wireless communication system 失效
标题翻译：主动消除无线通信系统中的干扰
公开(公告)号：US08755756B1
公开(公告)日：2014-06-17
申请号：US12769536
申请日：2010-04-28
申请人： Ning Zhang , David Kuochieh Su , William J. McFarland , Chin-Hung Chen
发明人： Ning Zhang , David Kuochieh Su , William J. McFarland , Chin-Hung Chen
IPC分类号： H04B1/04
CPC分类号： H04B1/109 , H04B1/525
摘要： Various methods and corresponding active interference cancellation units are described. These methods and units can perform active interference cancellation in a system including multiple radios. Notably, signals from a first radio can be received as interference at a second radio. The described methods and units can provide interference conditioning, which manipulates an interference reference of the interference at the first radio to approximate an interference observed at the second radio. After tuning of the interference conditioning, the interference can be removed.
摘要翻译：描述各种方法和相应的主动干扰消除单元。这些方法和单元可以在包括多个无线电的系统中执行主动干扰消除。值得注意的是，来自第一无线电的信号可以作为第二无线电的干扰被接收。所描述的方法和单元可以提供干扰调节，其处理在第一无线电处的干扰的干扰参考以近似在第二无线电处观察到的干扰。在调谐干扰调节之后，可以去除干扰。

6. 发明授权

US07688864B2 Dynamic preamble detection 有权
标题翻译：动态前导码检测
公开(公告)号：US07688864B2
公开(公告)日：2010-03-30
申请号：US11601535
申请日：2006-11-17
申请人： Chaohuang Zeng , William J. McFarland
发明人： Chaohuang Zeng , William J. McFarland
IPC分类号： H04L12/56 , H04J1/16
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.
摘要翻译：公开了用于动态前导码检测的系统和方法。包括前导码的同步部分的位的子集被解码，去加扰和分析，以动态地确定正在使用哪个前导码格式。用于第一前同步码格式的同步位的源数据值与用于第二前同步码格式的同步位的源数据值不同，并且接收系统使用该差来确定已经使用哪个前导码格式。可以使用关于使用哪种格式的信息来扩展同步操作。

7. 发明授权

US07643810B2 Method and system for noise floor calibration and receive signal strength detection 失效
标题翻译：噪声本底校准和接收信号强度检测方法和系统
公开(公告)号：US07643810B2
公开(公告)日：2010-01-05
申请号：US11766060
申请日：2007-06-20
申请人： Paul J. Husted , William J. McFarland
发明人： Paul J. Husted , William J. McFarland
IPC分类号： H04B17/00
CPC分类号： H03G3/3078 , H03G3/3068 , H04B17/345
摘要： A system for detecting the level of the noise floor due to circuit noise as seen at the ADC for a wireless receiver. The system measures power after digitizing and filtering, and subtracts off any variable gain used in the analog front end to determine differentially the size of the signal at the antenna. The system further differentially detects the signal size of any incoming signal at the antenna in a similar fashion, and determines its size relative to the measured noise floor. If the level of the circuit noise of the receiver is known absolutely, the absolute signal size of the incoming signal can likewise be determined with this inventive method and system.
摘要翻译：一种用于在无线接收机的ADC处检测由于电路噪声导致的本底噪声电平的系统。该系统在数字化和滤波后测量功率，并减去模拟前端中使用的任何可变增益，以区分天线信号的大小。该系统以类似的方式进一步差分地检测天线处的任何进入信号的信号大小，并且确定其相对于测量的本底噪声的大小。如果接收机的电路噪声的电平绝对已知，则输入信号的绝对信号大小同样可以利用本发明的方法和系统来确定。

8. 发明授权

US07529309B2 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：US07529309B2
公开(公告)日：2009-05-05
申请号：US11937471
申请日：2007-11-08
申请人： William J. McFarland
发明人： William J. McFarland
IPC分类号： H04K1/10 , H04L27/28
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 earners used. The selection of symbol rate and number of earners 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 earners 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。这些节点有几种动态改变所使用的收入人数的方法。可以根据明确的渠道测量，渠道的先验知识或过去的经验，为特定频道优化符号率和收入人数的选择。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收入者数量，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头部中的指示所有节点都可以理解的操作。

9. 发明授权

US07245882B1 Method and apparatus for a signal selective RF transceiver system 有权
标题翻译：用于信号选择性RF收发器系统的方法和装置
公开(公告)号：US07245882B1
公开(公告)日：2007-07-17
申请号：US10621687
申请日：2003-07-17
申请人： William J. McFarland
发明人： William J. McFarland
IPC分类号： H04B7/08 , H04B17/02
CPC分类号： H04W74/08 , H04B1/18 , H04W72/04
摘要： Method and apparatus to dynamically configure the signal reception selectivity of a plurality of transceivers is described. In one embodiment, a transceiver includes a receiver circuit having two or more filter circuits. Each of the filter circuits is configured to pass RF signals from a different portion of an overall receiver bandwidth. When two or more receivers in proximity to one another are simultaneously operating, the filter circuits of the respective receiver are dynamically configured to different RF frequency passbands to minimize interference and cross talk between receivers and transmitters.
摘要翻译：描述了动态地配置多个收发器的信号接收选择性的方法和装置。在一个实施例中，收发器包括具有两个或更多个滤波器电路的接收器电路。每个滤波器电路被配置为从整个接收机带宽的不同部分传递RF信号。当彼此接近的两个或多个接收器同时工作时，相应接收机的滤波器电路被动态地配置成不同的RF频率通带，以最小化接收机和发射机之间的干扰和串扰。

10. 发明授权

US5952853A Method for extending the output range of pulse-width based phase detectors 失效
标题翻译：扩展基于脉冲宽度的相位检测器的输出范围的方法
公开(公告)号：US5952853A
公开(公告)日：1999-09-14
申请号：US997148
申请日：1997-12-23
申请人： Scott D. Willingham , William J. McFarland
发明人： Scott D. Willingham , William J. McFarland
IPC分类号： G01R25/00 , H03D13/00 , H03K5/26 , H03L7/081 , H03L7/085 , H03L7/089
CPC分类号： G01R25/00 , H03D13/004 , H03L7/081 , H03L7/089
摘要： A circuit for generating a signal that is proportional to the phase difference between a reference signal and a variable frequency signal. The circuit includes a reference generating circuit for generating N phase shifted reference signals from the reference signal. Each of the phase shifted reference signals has the same frequency and a different phase. The phase of the n.sup.th one of the phase shifted reference signals is equal to 360n/N degrees, where N>1 and n runs from 0 to N-1. A phase detection circuit generates a phase output signal proportional to the phase difference between the variable frequency signal and the phase shifted reference signal currently being outputted by the reference generating circuit. The phase output signal has value of I when the output signal corresponds to a phase difference of 360/N degrees. An overflow detection circuit determines when the phase output signal has an absolute value greater than I and generates a count signal and a phase adjustment signal when this situation is detected. The phase adjustment signal is coupled to the reference generating circuit and causes the reference generating circuit to select a new phase shifted reference signal. A counter is then incremented/decremented to track the accumulated phase adjustments. A digital to analog converter converts the digital value in the counter to a signal having an amplitude equal to MI, where M is the digital value. A sum circuit adds this signal to the phase output signal.
摘要翻译：用于产生与参考信号和可变频率信号之间的相位差成比例的信号的电路。电路包括用于从参考信号产生N个相移参考信号的参考产生电路。每个相移参考信号具有相同的频率和不同的相位。第n个相移参考信号的相位等于360n / N度，其中N≥1且n从0到N-1。相位检测电路产生与参考发生电路当前正在输出的可变频率信号和相移参考信号之间的相位差成比例的相位输出信号。当输出信号对应于360 / N度的相位差时，相位输出信号的值为I。溢出检测电路确定相位输出信号何时具有大于I的绝对值，并且当检测到这种情况时产生计数信号和相位调整信号。相位调整信号耦合到参考产生电路，并使基准产生电路选择新的相移基准信号。然后计数器递增/递减，以跟踪累积的相位调整。数模转换器将计数器中的数字值转换为幅度等于MI的信号，其中M是数字值。总和电路将该信号添加到相位输出信号。

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