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    • 8. 发明授权
    • Multi-carrier communication systems employing variable symbol rates and number of carriers
    • 采用可变符号率和载波数量的多载波通信系统
    • US07529309B2
    • 2009-05-05
    • US11937471
    • 2007-11-08
    • William J. McFarland
    • William J. McFarland
    • H04K1/10H04L27/28
    • H04W28/0231H04L1/0002H04L1/0017H04L1/0025H04L1/0026H04L1/0034H04L1/20H04L5/0007H04L5/003H04L5/0046H04L5/006H04L5/0064H04L25/0224H04L25/08H04L27/2602H04L27/2608H04L27/2613H04L27/2626H04L27/2628
    • 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.
    • 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
    • Method and apparatus for a signal selective RF transceiver system
    • 用于信号选择性RF收发器系统的方法和装置
    • US07245882B1
    • 2007-07-17
    • US10621687
    • 2003-07-17
    • William J. McFarland
    • William J. McFarland
    • H04B7/08H04B17/02
    • H04W74/08H04B1/18H04W72/04
    • 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.
    • 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
    • Method for extending the output range of pulse-width based phase
detectors
    • 扩展基于脉冲宽度的相位检测器的输出范围的方法
    • US5952853A
    • 1999-09-14
    • US997148
    • 1997-12-23
    • Scott D. WillinghamWilliam J. McFarland
    • Scott D. WillinghamWilliam J. McFarland
    • G01R25/00H03D13/00H03K5/26H03L7/081H03L7/085H03L7/089
    • G01R25/00H03D13/004H03L7/081H03L7/089
    • 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.
    • 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。