公开(公告)号：US20090284434A1

公开(公告)日：2009-11-19

申请号：US12435557

申请日：2009-05-05

申请人： Griffin K. Gothard ,  Alton S. Keel, JR. ,  Christopher A. Snyder ,  Bing Chiang ,  Joe T. Richeson ,  Douglas H. Wood ,  James A. Proctor, JR. ,  Kenneth M. Gainey

发明人： Griffin K. Gothard ,  Alton S. Keel, JR. ,  Christopher A. Snyder ,  Bing Chiang ,  Joe T. Richeson ,  Douglas H. Wood ,  James A. Proctor, JR. ,  Kenneth M. Gainey

IPC分类号： H01Q19/10

CPC分类号： H01Q19/32 ,  H01Q1/241 ,  H01Q1/246 ,  H01Q3/2605 ,  H01Q3/2611 ,  H01Q3/446 ,  H01Q19/26

摘要： An antenna apparatus, which can increase capacity in a cellular communication system or Wireless Local Area Network (WLAN), such as an 802.11 network, operates in conjunction with a mobile subscriber unit or client station. At least one antenna element is active and located within multiple passive antenna elements. The passive antenna elements are coupled to selectable impedance components for phase control of re-radiated RF signals. Various techniques for determining the phase of each antenna element are supported to enable the antenna apparatus to direct an antenna beam pattern toward a base station or access point with maximum gain, and, consequently, maximum signal-to-noise ratio. By directionally receiving and transmitting signals, multipath fading is greatly reduced as well as intercell interference.

摘要翻译： 可以增加诸如802.11网络的蜂窝通信系统或无线局域网（WLAN）中的容量的天线装置与移动用户单元或客户端一起操作。 至少一个天线元件是有源的并且位于多个无源天线元件内。 无源天线元件耦合到可选择的阻抗分量，用于再辐射RF信号的相位控制。 支持用于确定每个天线元件的相位的各种技术，以使得天线装置能够将天线波束图案引导到具有最大增益的基站或接入点，并因此导致最大的信噪比。 通过定向接收和发送信号，多径衰落大大降低以及小区间干扰。

公开(公告)号：US20090135971A1

公开(公告)日：2009-05-28

申请号：US12360464

申请日：2009-01-27

申请人： Mark J. Takatz ,  Alton S. Keel, JR. ,  Stefan Haenggi

发明人： Mark J. Takatz ,  Alton S. Keel, JR. ,  Stefan Haenggi

IPC分类号： H04L27/08 ,  H04B1/06

CPC分类号： H04B1/0007 ,  H03G3/3052 ,  H04B1/0003 ,  H04B1/0039 ,  H04B1/28

摘要： An Automatic Gain Control (AGC) circuit as used in a digital receiver that utilizes a main loop filter that is of a relatively wide bandwidth. A pre-filter, wideband variance is determined from the input digital signal, and a post-filter, narrowband variance is also determined. The wideband and narrowband variances are then compared to determine if the wideband signal power indicates a variance level that is too great to permit normal loop operation. By reapplying this difference in the power levels to the filter output as needed, such as by a scaling operation, the loss in dynamic range is effectively recovered. In a preferred embodiment, an adjustable gain input amplifier feeds an intermediate frequency (IF) signal to an analog-to-digital converter (ADC). The digitized IF signal is then down-converted to a baseband frequency and subjected to digital filtering. A narrowband sample variance (PN) of the digitally filtered (narrowband) data is then determined. A wideband sample variance (PW) is also taken from the raw ADC output data over the same period as the time period used for PN. In the presence of out-of-band signal components, PW will be quite different from PN. This difference indicates a desired proportional difference in a control voltage or a gain backoff amount.

摘要翻译： 一种在数字接收机中使用的自动增益控制（AGC）电路，其利用具有较宽带宽的主环路滤波器。 从输入数字信号确定预滤波器，宽带方差，并且还确定后滤波器，窄带方差。 然后比较宽带和窄带方差，以确定宽带信号功率是否指示太大而不能允许正常环路操作的方差水平。 通过根据需要将功率电平的这种差异重新应用于滤波器输出，例如通过缩放操作，动态范围的损失被有效地恢复。 在优选实施例中，可调增益输入放大器将中频（IF）信号馈送到模数转换器（ADC）。 然后将数字化的IF信号下变频到基带频率并进行数字滤波。 然后确定数字滤波（窄带）数据的窄带样本方差（PN）。 在与PN使用的时间段相同的周期内，也可以从原始ADC输出数据获取宽带采样方差（PW）。 在存在带外信号分量的情况下，PW将与PN完全不同。 该差异表示控制电压或增益回退量的期望比例差。