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1. 发明授权

US06580746B2 System and method for acquiring a received signal in a spread spectrum device 有权
公开(公告)号：US06580746B2
公开(公告)日：2003-06-17
申请号：US09941362
申请日：2001-08-28
申请人： Raghu Challa , Farrokh Abrishamkar , Ian Fevrier , Serguei Glazko , Way-Shing Lee , Christopher Patrick , Gil Sih
发明人： Raghu Challa , Farrokh Abrishamkar , Ian Fevrier , Serguei Glazko , Way-Shing Lee , Christopher Patrick , Gil Sih
IPC分类号： H04B1500
CPC分类号： H04B1/7075 , H04B7/2668 , H04B17/0085 , H04B17/3912 , H04W24/00
摘要： A spread spectrum wireless device (100) may include a receiver (110), a searcher (128), a search controller (130) and other features. The search controller (130) selectively generates control signals to control the searcher (128), which searches for a spread-spectrum signal. In one embodiment, the architecture of the searcher (128) is dynamically configurable by the search controller (130) to selectively search multiple channels using multiple frequency bins for the signal.

2. 发明授权

US06700922B2 System and method for acquiring a received signal in a spread spectrum device 有权
标题翻译：用于在扩频设备中获取接收信号的系统和方法
公开(公告)号：US06700922B2
公开(公告)日：2004-03-02
申请号：US10426219
申请日：2003-04-30
申请人： Raghu Challa , Farrokh Abrishamkar , Ian Fevrier , Serguei Glazko , Way-Shing Lee , Christopher Patrick , Gil Sih
发明人： Raghu Challa , Farrokh Abrishamkar , Ian Fevrier , Serguei Glazko , Way-Shing Lee , Christopher Patrick , Gil Sih
IPC分类号： H04B169
CPC分类号： H04W24/00 , H04B17/0085 , H04B17/3912 , H04W56/0035
摘要： A spread spectrum wireless device (100) may include a receiver (110), a searcher (128), a search controller (130) and other features. The search controller (130) selectively generates control signals to control the searcher (128), which searches for a spread-spectrum signal. In one embodiment, the architecture of the searcher (128) is dynamically configurable by the search controller (130) to selectively search multiple channels using multiple frequency bins for the signal.
摘要翻译：扩频无线设备（100）可以包括接收机（110），搜索器（128），搜索控制器（130）和其他特征。搜索控制器（130）选择性地产生控制信号以控制寻找扩频信号的搜索器（128）。在一个实施例中，搜索器（128）的架构由搜索控制器（130）动态地配置，以选择性地使用针对该信号的多个频率仓搜索多个信道。

3. 发明申请

US20070066268A1 Systems, methods, and apparatus for frequency control 有权
标题翻译：用于频率控制的系统，方法和装置
公开(公告)号：US20070066268A1
公开(公告)日：2007-03-22
申请号：US11430613
申请日：2006-05-08
申请人： Emilija Simic , Christopher Patrick , Raghu Challa , Douglas Rowitch
发明人： Emilija Simic , Christopher Patrick , Raghu Challa , Douglas Rowitch
IPC分类号： H04B1/26
CPC分类号： G01S19/235 , H04B1/26
摘要： A receiver according to one embodiment includes a frequency control unit configured to receive a stream of samples including a plurality of received instances of a transmitted signal. The frequency control unit is configured to output a first correction signal (e.g. indicating a rotation) that is based on more than one of the received instances and a second correction signal (e.g. to control an oscillator) that is also based on more than one of the received instances. In some embodiments, a controlled oscillator is used to receive and/or transmit another signal, such as a signal received from a GPS space vehicle. In other embodiments, the received instances are from a GPS signal. In further embodiments, a fixed-frequency oscillator is used, and the second correction signal is used to receive and/or transmit another signal, such as a GPS signal.
摘要翻译：根据一个实施例的接收机包括：频率控制单元，被配置为接收包括发射信号的多个接收的实例的样本流。频率控制单元被配置为输出基于多于一个接收到的实例的第一校正信号（例如指示旋转）和还基于多个接收实例中的多于一个的第二校正信号（例如，以控制振荡器）接收的实例。在一些实施例中，受控振荡器用于接收和/或发送另一信号，例如从GPS空中交通工具接收的信号。在其他实施例中，所接收的实例是来自GPS信号。在另外的实施例中，使用固定频率振荡器，并且第二校正信号用于接收和/或发送诸如GPS信号的另一信号。

4. 发明授权

US08139685B2 Systems, methods, and apparatus for frequency control 有权
标题翻译：用于频率控制的系统，方法和装置
公开(公告)号：US08139685B2
公开(公告)日：2012-03-20
申请号：US11430613
申请日：2006-05-08
申请人： Emilija Simic , Christopher Patrick , Raghu Challa , Douglas Neal Rowitch
发明人： Emilija Simic , Christopher Patrick , Raghu Challa , Douglas Neal Rowitch
IPC分类号： H04L27/00
CPC分类号： G01S19/235 , H04B1/26
摘要： A receiver according to one embodiment includes a frequency control unit configured to receive a stream of samples including a plurality of received instances of a transmitted signal. The frequency control unit is configured to output a first correction signal (e.g. indicating a rotation) that is based on more than one of the received instances and a second correction signal (e.g. to control an oscillator) that is also based on more than one of the received instances. In some embodiments, a controlled oscillator is used to receive and/or transmit another signal, such as a signal received from a GPS space vehicle. In other embodiments, the received instances are from a GPS signal. In further embodiments, a fixed-frequency oscillator is used, and the second correction signal is used to receive and/or transmit another signal, such as a GPS signal.
摘要翻译：根据一个实施例的接收机包括：频率控制单元，被配置为接收包括发射信号的多个接收的实例的样本流。频率控制单元被配置为输出基于多于一个接收到的实例的第一校正信号（例如指示旋转）和还基于多个接收实例中的多于一个的第二校正信号（例如，以控制振荡器）接收的实例。在一些实施例中，受控振荡器用于接收和/或发送另一信号，例如从GPS空中交通工具接收的信号。在其他实施例中，所接收的实例来自GPS信号。在另外的实施例中，使用固定频率振荡器，并且第二校正信号用于接收和/或发送诸如GPS信号的另一信号。

5. 发明授权

US08665996B2 Efficient parallel sub-packet decoding using multiple decoders 有权
标题翻译：使用多个解码器的高效并行子包解码
公开(公告)号：US08665996B2
公开(公告)日：2014-03-04
申请号：US12400124
申请日：2009-03-09
申请人： Joseph Zanotelli , Mrinal Mahesh Nath , Arunava Chaudhuri , Kaushik Ghosh , Raghu Challa , Weihong Jing
发明人： Joseph Zanotelli , Mrinal Mahesh Nath , Arunava Chaudhuri , Kaushik Ghosh , Raghu Challa , Weihong Jing
IPC分类号： H04L27/06
CPC分类号： H04L1/0045 , H03M13/2957 , H03M13/41 , H03M13/6508 , H03M13/6561 , H04L1/0052
摘要： A configurable decoder within a receiver (for example, within a wireless communication device) includes numerous decoders. In one mode, the multiple decoders are used to decode different sub-packets of a packet. When one decoder completes decoding the last sub-packet assigned to it of the packet, then that decoder generates a packet done indication. A control circuit receives the packet done indications, and when all the decoders have generated packet done indications then the control circuit initiates an action. In one example, the action is the interrupting of a processor. The processor responds by reading status information from the control circuit, thereby resetting the interrupt. End-of-packet markers are usable to generate packet done indications and to generate EOP interrupts. Similarly, end-of-group markers are usable to generate group done indications and to generate EOG interrupts. The decoder block is configurable to process sub-packets of a packet using either one or multiple decoders.
摘要翻译：接收机内的可配置解码器（例如，在无线通信设备内）包括许多解码器。在一种模式中，多个解码器用于解码分组的不同子分组。当一个解码器完成对分组给它的最后一个子分组的解码时，该解码器产生分组完成指示。控制电路接收分组完成指示，并且当所有解码器已经生成分组完成指示时，控制电路启动动作。在一个示例中，动作是处理器的中断。处理器通过从控制电路读取状态信息进行响应，从而复位中断。分组结束标记可用于生成分组完成指示并产生EOP中断。类似地，组尾标记可用于生成组完成指示并产生EOG中断。解码器块可配置为使用一个或多个解码器来处理分组的子分组。

6. 发明授权

US08626099B2 Direct conversion receiver architecture 有权
标题翻译：直接转换接收机架构
公开(公告)号：US08626099B2
公开(公告)日：2014-01-07
申请号：US11376502
申请日：2006-03-14
申请人： Tao Li , Christian Holenstein , Inyup Kang , Brett C. Walker , Paul E. Peterzell , Raghu Challa , Matthew L. Severson , Arun Raghupathy , Gilbert Christopher Sih
发明人： Tao Li , Christian Holenstein , Inyup Kang , Brett C. Walker , Paul E. Peterzell , Raghu Challa , Matthew L. Severson , Arun Raghupathy , Gilbert Christopher Sih
IPC分类号： H04B1/06
CPC分类号： H03G3/3078 , H03G3/3068 , H03G3/3089
摘要： A direct downconversion receiver architecture having a DC loop to remove DC offset from the signal components, a digital variable gain amplifier (DVGA) to provide a range of gains, an automatic gain control (AGC) loop to provide gain control for the DVGA and RF/analog circuitry, and a serial bus interface (SBI) unit to provide controls for the RF/analog circuitry via a serial bus. The DVGA may be advantageously designed and located as described herein. The operating mode of the VGA loop may be selected based on the operating mode of the DC loop, since these two loops interact with one another. The duration of time the DC loop is operated in an acquisition mode may be selected to be inversely proportional to the DC loop bandwidth in the acquisition mode. The controls for some or all of the RF/analog circuitry may be provided via the serial bus.
摘要翻译：具有用于去除信号分量的DC偏移的DC环路的直接下变频接收机架构，提供一系列增益的数字可变增益放大器（DVGA），用于为DVGA和RF提供增益控制的自动增益控制（AGC）回路 /模拟电路和串行总线接口（SBI）单元，通过串行总线为RF /模拟电路提供控制。可以如本文所述有利地设计和定位DVGA。可以基于DC循环的操作模式来选择VGA循环的操作模式，因为这两个循环彼此相互作用。在采集模式下，DC环路工作的持续时间可以被选择为与采集模式中的DC环路带宽成反比。一些或全部RF /模拟电路的控制可以通过串行总线提供。

7. 发明授权

US08615212B2 Direct conversion receiver architecture 有权
公开(公告)号：US08615212B2
公开(公告)日：2013-12-24
申请号：US11862330
申请日：2007-09-27
申请人： Tao Li , Christian Holenstein , Inyup Kang , Brett C. Walker , Paul E. Peterzell , Raghu Challa , Matthew L. Severson , Arun Raghupathy , Gilbert Christopher Sih
发明人： Tao Li , Christian Holenstein , Inyup Kang , Brett C. Walker , Paul E. Peterzell , Raghu Challa , Matthew L. Severson , Arun Raghupathy , Gilbert Christopher Sih
IPC分类号： H04B7/00
CPC分类号： H03G3/3078 , H03G3/3068 , H03G3/3089
摘要： A direct downconversion receiver architecture having a DC loop to remove DC offset from the signal components, a digital variable gain amplifier (DVGA) to provide a range of gains, an automatic gain control (AGC) loop to provide gain control for the DVGA and RF/analog circuitry, and a serial bus interface (SBI) unit to provide controls for the RF/analog circuitry via a serial bus. The DVGA may be advantageously designed and located as described herein. The operating mode of the VGA loop may be selected based on the operating mode of the DC loop, since these two loops interact with one another. The duration of time the DC loop is operated in an acquisition mode may be selected to be inversely proportional to the DC loop bandwidth in the acquisition mode. The controls for some or all of the RF/analog circuitry may be provided via the serial bus.

8. 发明授权

US07436412B2 Graphics engine with efficient interpolation 有权
标题翻译：具有高效插值的图形引擎
公开(公告)号：US07436412B2
公开(公告)日：2008-10-14
申请号：US11211939
申请日：2005-08-24
申请人： Raghu Challa
发明人： Raghu Challa
IPC分类号： G09G5/00 , G09G5/02 , G06K9/32 , G06T11/40
CPC分类号： G06T11/40 , G06T9/00 , G06T15/005 , G06T15/80
摘要： A graphics engine includes a setup unit and a rendering unit. The setup unit computes coefficients A, B, and C used for interpolating an attribute v of a triangle to be rendered for a graphics image. The setup unit then derives compressed coefficients Ã, {tilde over (B)}, and {tilde over (C)} based on the coefficients A, B, and C. The compressed coefficients have a fixed-point format with R integer bits left of a binary point and T fractional bits right of the binary point, where R>1 and T≧0. R is selected based on the number of bits used for attribute v, T is selected based on the screen dimension, and R+T is much less than the number of bits used to represent the coefficients A, B, and C. The rendering unit performs interpolation for the attribute v using the compressed coefficients Ã, {tilde over (B)}, and {tilde over (C)}, and may be implemented with a simple (R+T)-bit non-saturating accumulator.
摘要翻译：图形引擎包括设置单元和渲染单元。设置单元计算用于内插用于图形图像呈现的三角形的属性v的系数A，B和C. 设置单元然后基于系数A，B和C导出压缩系数∈B和C。压缩系数具有固定点格式，其中R个整数位为二进制点，T分数位为二进制位点，其中R> 1和T> = 0。基于用于属性v的位数选择R，基于屏幕尺寸选择T，并且R + T远小于用于表示系数A，B和C的比特数。渲染单元使用压缩系数∈B和C对属性v执行内插，并且可以用简单（R + T）位非饱和累加器来实现。

9. 发明授权

US06704555B2 Apparatus and method for calibrating local oscillation frequency in wireless communications 有权
标题翻译：无线通信校准本地振荡频率的装置和方法
公开(公告)号：US06704555B2
公开(公告)日：2004-03-09
申请号：US09804707
申请日：2001-03-12
申请人： Gilbert C. Sih , Raghu Challa
发明人： Gilbert C. Sih , Raghu Challa
IPC分类号： H04B106
CPC分类号： H04L27/0014 , H04L2027/0016 , H04L2027/0057 , H04L2027/0087
摘要： According to a disclosed embodiment, a receiver comprising a digital rotator in combination with a frequency error discriminator in a digital automatic frequency control loop is used to arrive at accurate digital values used to calibrate a local oscillation frequency. A frequency error in the oscillation frequency of a local frequency generation loop causes a change in the baseband input signal frequency. The change in the baseband input signal frequency related to the frequency error in the local frequency generation loop can be detected as a phase rotation by the frequency error discriminator. By using the digital automatic frequency control loop, the frequency error introduced by the local frequency generation is determined with accuracy. The frequency error and corresponding control bits are entered into a calibration table. The calibration table may be used to adjust the local oscillation frequency for temperature changes, pilot frequency searching, and quick paging.
摘要翻译：根据所公开的实施例，使用包括与数字自动频率控制环路中的频率误差鉴别器结合的数字旋转器的接收器来获得用于校准本地振荡频率的精确数字值。本地频率产生环路的振荡频率的频率误差导致基带输入信号频率的变化。与本地频率产生回路中的频率误差相关的基带输入信号频率的变化可以被频率误差鉴别器检测为相位旋转。通过使用数字自动频率控制回路，准确地确定由本地频率产生引入的频率误差。将频率误差和相应的控制位输入校准表。校准表可用于调整温度变化，导频搜索和快速寻呼的本地振荡频率。

10. 发明授权

US06608858B1 Multipath doppler adjusted frequency tracking loop 有权
标题翻译：多径多普勒调整频率跟踪回路
公开(公告)号：US06608858B1
公开(公告)日：2003-08-19
申请号：US09491349
申请日：2000-01-26
申请人： Gilbert C. Sih , Avneesh Agrawal , Mark Roh , Brian K. Butler , Raghu Challa
发明人： Gilbert C. Sih , Avneesh Agrawal , Mark Roh , Brian K. Butler , Raghu Challa
IPC分类号： H04B1707
CPC分类号： H04B1/7087 , H04B1/7115 , H04B1/7117 , H04B2201/70701 , H04L27/0014 , H04L2027/0032 , H04L2027/0057 , H04L2027/0087
摘要： A method and apparatus for frequency tracking is described. The present invention provides a tracking mechanism for removing the effects of error due to frequency offset as well as compensation for frequency error due to doppler in a plurality of multipath signals. Each finger of a RAKE receiver utilizing the present invention will compute a frequency error for that finger. The weighted average of all of these frequency errors is calculated and filtered to provide a control signal for varying the frequency of IF and RF frequency synthesizers, accounting for the common frequency offset seen at each finger. Additionally, each finger is equipped with a rotator for providing frequency adjustment specific to that finger. The frequency of each finger is adjusted through feedback of the frequency error for that finger.
摘要翻译：描述了用于频率跟踪的方法和装置。本发明提供了一种用于消除由于频率偏移引起的误差的影响的跟踪机制以及由多个多径信号中的多普勒引起的频率误差的补偿。利用本发明的RAKE接收机的每个手指将计算该手指的频率误差。计算并滤波所有这些频率误差的加权平均值，以提供用于改变IF和RF频率合成器的频率的控制信号，从而考虑每个手指处的共同频率偏移。此外，每个手指配备有用于提供特定于该手指的频率调节的旋转器。每个手指的频率通过该手指的频率误差的反馈进行调整。

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