公开(公告)号：US20060291428A1

公开(公告)日：2006-12-28

申请号：US11165760

申请日：2005-06-23

Applicant: Daniel Filipovic

Inventor： Daniel Filipovic

IPC: H04B7/216

CPC classification number: H04B1/71 ,  H04B1/0035 ,  H04B1/0071 ,  H04B1/406

Abstract: An adaptive multi-channel (AMC) modem that can receive one or multiple spread spectrum signals simultaneously includes an adjustable filter, a ΔΣ ADC, and a digital processor. The adjustable filter filters an input signal with an adjustable bandwidth and provides an output signal comprised of a selected number of spread spectrum signals. The ΔΣ ADC digitizes the output signal and provides data samples. The sampling rate and/or the reference voltage of the ΔΣ ADC may be varied to obtain the desired performance. The digital processor processes the data samples for each spread spectrum signal to recover data sent in that signal. A controller ascertains the operating conditions (e.g., the desired signal level, the undesired signal level, and so on) and selects the number of spread spectrum signals to receive based on the operating conditions, user requirements, and possibly other factors.

Abstract translation: 可以同时接收一个或多个扩频信号的自适应多通道（AMC）调制解调器包括可调滤波器，DeltaSigma ADC和数字处理器。 可调滤波器对具有可调节带宽的输入信号进行滤波，并提供由所选数量的扩频信号组成的输出信号。 DeltaSigma ADC将输出信号数字化并提供数据采样。 可以改变DeltaSigma ADC的采样率和/或参考电压以获得期望的性能。 数字处理器处理每个扩频信号的数据样本，以恢复在该信号中发送的数据。 控制器确定操作条件（例如，期望的信号电平，不需要的信号电平等等），并且基于操作条件，用户要求以及可能的其他因素来选择要接收的扩频信号的数量。

公开(公告)号：US06721368B1

公开(公告)日：2004-04-13

申请号：US09519734

申请日：2000-03-04

Applicant: Saed Younis ,  Emilija Simic ,  Thomas Wilborn ,  Haitao Zhang ,  Daniel Filipovic ,  Ralph Kaufman ,  Ming (Jason) Yu Lin

Inventor： Saed Younis ,  Emilija Simic ,  Thomas Wilborn ,  Haitao Zhang ,  Daniel Filipovic ,  Ralph Kaufman ,  Ming (Jason) Yu Lin

IPC: H04L2704

CPC classification number: H03G3/3042 ,  H03F2203/7239 ,  H03G1/0088

Abstract: Transmitter architectures for a communications system having improved performance over conventional transmitter architectures. The improvements include a combination of the following: faster response time for the control signals, improved linearity, reduced interference, reduced power consumption, lower circuit complexity, and lower costs. For a cellular application, these improvements can lead to increased system capacity, smaller telephone size, increased talk and standby times, and greater acceptance of the product. Circuitry is provided to speed up the response time of a control signal. The control loop for various elements in the transmit signal path are integrated. A gain control mechanism allows for accurate adjustment of the output transmit power level. Control mechanisms are provided to power down the power amplifier, or the entire transmit signal path, when not needed. The gains of the various elements in the transmit signal path are controlled to reduce transients in the output transmit power, and to also ensure that transients are downward.

Abstract translation: 具有比传统发射机架构具有改进性能的通信系统的发射机架构。 这些改进包括以下组合：控制信号的响应时间更快，线性度更好，干扰减少，功耗降低，电路复杂度降低，成本降低。 对于蜂窝应用，这些改进可以导致系统容量增加，电话尺寸更小，通话和待机时间增加，以及对产品的更多接受。 提供电路以加快控制信号的响应时间。 发送信号路径中的各种元件的控制回路被集成。 增益控制机制允许精确调整输出发射功率电平。 提供控制机制以在不需要时将功率放大器或整个发射信号路径断电。 控制发射信号路径中的各种元件的增益以减少输出发射功率的瞬变，并且还确保瞬变是向下的。

公开(公告)号：US06590544B1

公开(公告)日：2003-07-08

申请号：US09146457

申请日：1998-09-01

Applicant: Daniel Filipovic

Inventor： Daniel Filipovic

IPC: H01Q1906

CPC classification number: H01Q15/08 ,  H01Q19/062

Abstract: A novel and improved dielectric lens assembly (100) includes a dielectric extension (108) on a hemispherical dielectric lens (104), to provide a dielectric lens which exhibits properties of an elliptical lens. The extended dielectric lens can be implemented with a feed antenna (112) to improve the directivity of the antenna. The extension portion (108) of the lens assembly (100) is fabricated using a plurality of dielectric wafers disposed on the bottom surface of the hemisphere, an angled extension (516), or a cylindrical extension. The entire hemispherical lens and extension assembly (508) can be a single piece of dielectric material formed into the desired shape, or the assembly can be fabricated using a plurality of dielectric components (512, 516) coupled together to form the lens assembly.

Abstract translation: 一种新颖且改进的介电透镜组件（100）包括在半球形介电透镜（104）上的介电延伸部（108），以提供呈现椭圆透镜性质的介电透镜。 扩展电介质透镜可以用馈电天线（112）来实现，以改善天线的方向性。 透镜组件（100）的延伸部分（108）使用设置在半球的底表面上的多个电介质晶片，成角度的延伸部（516）或圆柱形延伸部来制造。 整个半球形透镜和延伸组件（508）可以是形成为所需形状的单片介电材料，或者可以使用耦合在一起以形成透镜组件的多个介电部件（512,516）来制造组件。

公开(公告)号：US07319852B2

公开(公告)日：2008-01-15

申请号：US10233364

申请日：2002-08-29

Applicant: Nikolai Schlegel ,  Christian Holenstein ,  Daniel Filipovic ,  Nitin Kasturi

Inventor： Nikolai Schlegel ,  Christian Holenstein ,  Daniel Filipovic ,  Nitin Kasturi

IPC: H04B1/26

CPC classification number: H04L25/063 ,  H03D3/008 ,  H04B1/30

Abstract: An apparatus for coarse compensation of a direct current (DC) offset in a direct to baseband receiver architecture utilizes a serial analog to digital converter (ADC), such as a Delta-Sigma converter, to convert the received signal to digital form. The output of the ADC is sampled for a predetermined number of samples and a counter coupled to the ADC is incremented each time the sample generated by the ADC is a logic one. The counter is not incremented if the sample from the ADC is a logic zero. After the predetermined number of samples is obtained, the counter value is indicative of the DC offset in the received signal. The counter value may be converted by a code converter to a correction value for easy operation of a digital to analog converter (DAC). If the number of samples from the ADC is a power of two, the code converted may be readily implemented by simply inverting the most significant bit (MSB) from the counter to thereby generate a twos complement version of the counter value. The correction value is coupled to the DAC to generate a compensation signal, which is provided to the received signal path in the form of a feedback signal to compensate for the DC offset.

Abstract translation: 用于直接到基带接收机架构中的直流（DC）偏移的粗略补偿的装置利用诸如Δ-Σ转换器的串行模数转换器（ADC）将接收的信号转换成数字形式。 对于预定数量的采样，ADC的输出被采样，并且每当由ADC产生的采样为逻辑1时，耦合到ADC的计数器递增。 如果来自ADC的采样为逻辑0，则计数器不递增。 在获得预定数量的样本之后，计数器值表示接收信号中的直流偏移。 计数器值可以由代码转换器转换成用于容易操作数模转换器（DAC）的校正值。 如果来自ADC的采样数是2的幂，则通过简单地将来自计数器的最高有效位（MSB）反相，从而生成计数器值的二进制补码版本，可以容易地实现转换代码。 校正值耦合到DAC以产生补偿信号，其以反馈信号的形式提供给接收信号路径以补偿DC偏移。

公开(公告)号：US20070104298A1

公开(公告)日：2007-05-10

申请号：US11269360

申请日：2005-11-07

Applicant: Daniel Filipovic ,  Charles Persico ,  Christopher Riddle

Inventor： Daniel Filipovic ,  Charles Persico ,  Christopher Riddle

IPC: H04L27/06

CPC classification number: H04B1/38 ,  H03J7/10 ,  H03J2200/01 ,  H03J2200/10 ,  H04L27/2332 ,  H04L2027/0036 ,  H04L2027/0055 ,  H04L2027/0065 ,  H04L2027/0087

Abstract: A wireless device achieves good performance using a crystal oscillator that is not compensated for temperature. The crystal oscillator provides a reference signal having a temperature dependent frequency error. A control unit estimates the frequency error (e.g., based on a received pilot) and provides a frequency error estimate. A clock generator generates a digital clock, which tracks chip timing, based on the reference signal and the frequency error estimate. A receiver frequency downconverts an input RF signal with a receive LO signal having the frequency error and provides an analog baseband signal. An ADC digitizes the analog baseband signal based on a sampling clock having the frequency error and provides ADC samples. A re-clocking circuit re-clocks the ADC samples based on a digital clock and provides data samples. A digital rotator frequency translates the data samples based on the frequency error estimate and provides frequency-translated samples centered near DC.

Abstract translation: 无线设备使用不补偿温度的晶体振荡器实现良好的性能。 晶体振荡器提供具有温度相关频率误差的参考信号。 控制单元估计频率误差（例如，基于接收到的导频）并提供频率误差估计。 时钟发生器基于参考信号和频率误差估计器产生跟踪芯片定时的数字时钟。 接收机使用具有频率误差的接收LO信号对输入RF信号进行下变频并提供模拟基带信号。 ADC根据具有频率误差的采样时钟数字化模拟基带信号，并提供ADC采样。 重新计时电路根据数字时钟对ADC采样进行重新计时，并提供数据采样。 数字旋转器频率基于频率误差估计来转换数据样本，并提供以DC为中心的频率转换样本。

公开(公告)号：US20050078596A1

公开(公告)日：2005-04-14

申请号：US10993873

申请日：2004-11-19

Applicant: Daniel Filipovic

Inventor： Daniel Filipovic

IPC: H04L27/38 ,  H04B7/216

CPC classification number: H04L27/3809 ,  H03G3/002

Abstract: A wireless communication device (WCD) implements an improved architecture for performing automatic gain control (AGC). For example, a WCD including a wireless receiver and a modem may incorporate a digital variable gain amplifier (DVGA) and an automatic gain control (AGC) unit that have the improved architecture. In particular, the architecture of the DVGA and AGC unit may be simplified and improved specifically for handling signals modulated according to a wireless networking standard such as one of the IEEE 802.11 standards.

Abstract translation: 无线通信设备（WCD）实现用于执行自动增益控制（AGC）的改进的架构。 例如，包括无线接收器和调制解调器的WCD可以包括具有改进的架构的数字可变增益放大器（DVGA）和自动增益控制（AGC）单元。 特别地，可以简化和改进DVGA和AGC单元的架构，用于处理根据诸如IEEE 802.11标准之一的无线联网标准调制的信号。

公开(公告)号：US5986620A

公开(公告)日：1999-11-16

申请号：US690117

申请日：1996-07-31

Applicant: Daniel Filipovic

Inventor： Daniel Filipovic

IPC: H01Q21/26 ,  H01Q1/36 ,  H01Q5/00 ,  H01Q5/02 ,  H01Q11/08 ,  H01Q21/30

CPC classification number: H01Q11/08 ,  H01Q1/362 ,  H01Q5/40

Abstract: A dual-band coupled-segment helical antenna provides operation in two frequency bands. The dual-band coupled-segment helical antenna includes a radiator portion having two sets of one or more helically wound radiators extending from one end of the radiator portion to the other end of the radiator portion. Radiators of the first set of radiators are comprised of two segments: a first radiator segment extends in a helical fashion from one end of the radiator portion toward the other end of the radiator portion; and a second radiator segment is U-shaped and extends in a helical fashion from the first end of the radiator portion toward the second end of the radiator portion. Radiators of the second set of radiators are comprised of a radiator disposed within said U-shaped segment. The first set of radiators resonates at a first frequency and the second set of radiators resonates at a second frequency thereby providing dual-band operation, with minimal coupling between the frequency bands.

Abstract translation: 双频带耦合段螺旋天线提供两个频带的操作。 双频带耦合段螺旋天线包括散热器部分，其具有从散热器部分的一端延伸到散热器部分的另一端的两组一个或多个螺旋缠绕的辐射器。 第一散热器组的散热器由两个部分组成：第一辐射器部分以辐射体部分的一端向散热器部分的另一端呈螺旋状延伸; 并且第二散热器段是U形的，并且从辐射器部分的第一端朝向散热器部分的第二端以螺旋方式延伸。 第二组散热器的散热器由设置在所述U形段内的散热器构成。 第一组辐射器以第一频率谐振，第二组辐射器以第二频率谐振，从而提供双频带操作，频带之间具有最小的耦合。