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21. 发明授权

US06980823B2 Intermediate wake mode to track sleep clock frequency in a wireless communication device 有权
标题翻译：中间唤醒模式来跟踪无线通信设备中的睡眠时钟频率
公开(公告)号：US06980823B2
公开(公告)日：2005-12-27
申请号：US10206630
申请日：2002-07-26
申请人： Raghu Challa , Baaziz Achour , Robbin D. Hughes
发明人： Raghu Challa , Baaziz Achour , Robbin D. Hughes
IPC分类号： H04L29/00 , H04B1/16 , H04B1/707 , H04B7/26 , H04W52/02 , H04B7/00
CPC分类号： H04B1/70756 , H04B2201/70709 , H04W52/0216 , H04W52/029 , H04W56/0035 , Y02D70/40
摘要： Various techniques for improving a wireless communication device are described. The techniques may include reducing power in a wireless communication device for a first sleep period and then increasing power in the wireless communication device for an intermediate wake period after the first sleep period to estimate an error of the sleep clock. The method may further include reducing power in the wireless communication device for a second sleep period after the intermediate wake period. The intermediate wake mode implemented during the intermediate period can be used to estimate the error of the sleep clock without performing one or more tasks associated with an awake mode, such as demodulation. The techniques may facilitate the effective use of low frequency low power clocks for sleep mode, even when relatively large slot cycles are defined within a slotted paging system.
摘要翻译：描述了用于改进无线通信设备的各种技术。这些技术可以包括在第一睡眠周期内减少无线通信设备中的功率，然后在第一睡眠周期之后的中间唤醒周期增加无线通信设备中的功率，以估计睡眠时钟的误差。该方法还可以包括在中间唤醒周期之后的第二睡眠周期内减少无线通信设备中的功率。在中间周期期间实现的中间唤醒模式可以用于估计休眠时钟的误差，而不执行与诸如解调之类的唤醒模式相关联的一个或多个任务。即使在时隙寻呼系统中定义相对较大的时隙周期，这些技术可以有助于有效地使用低频低功率时钟用于睡眠模式。

22. 发明授权

US06950841B2 Logarithmic lookup tables 有权
标题翻译：对数查询表
公开(公告)号：US06950841B2
公开(公告)日：2005-09-27
申请号：US09954760
申请日：2001-09-14
申请人： Raghu Challa , Nagabhushana Sindhushayana , Arun Raghupathy
发明人： Raghu Challa , Nagabhushana Sindhushayana , Arun Raghupathy
IPC分类号： G06F1/02 , G06F1/03 , G06F7/00 , G06F7/523 , G06F7/556 , H04B1/16 , H04B1/707
CPC分类号： G06F7/5235 , G06F1/0356 , G06F2101/10
摘要： In one embodiment, the invention is directed toward techniques for generating results in a logarithmic domain. The techniques may exploit properties of a logarithmic function to reduce the memory requirements needed to implement lookup tables. For example, the techniques may utilize non-uniform sampling over a logarithmic or logarithmic-like function to reduce the number of entries needed for a given lookup table. In particular, the techniques may involve separating a number into an exponent component and a mantissa component. Each of these different components can then be converted from a first domain to a second domain using different lookup tables.
摘要翻译：在一个实施例中，本发明涉及用于在对数域中生成结果的技术。这些技术可以利用对数函数的属性来减少实现查找表所需的内存要求。例如，这些技术可以利用对数或类似对数的函数的非均匀采样来减少给定查找表所需的条目数。特别地，这些技术可以包括将数字分成指数分量和尾数分量。然后可以使用不同的查找表将这些不同组件中的每一个从第一域转换为第二域。

23. 发明授权

US06748201B2 Gain control for communications device 失效
标题翻译：增益控制通信设备
公开(公告)号：US06748201B2
公开(公告)日：2004-06-08
申请号：US10112642
申请日：2002-03-28
申请人： Peter J. Black , Nagabhushana Sindhushayana , Raghu Challa , Kevin Seltmann
发明人： Peter J. Black , Nagabhushana Sindhushayana , Raghu Challa , Kevin Seltmann
IPC分类号： H04B138
CPC分类号： H03G3/3036 , H03G3/3068
摘要： Systems and techniques for gain control include amplifying a signal with an amplifier having a gain represented by one of a plurality of gain curves depending on a value of a parameter, the signal being amplified at a first one of the parameter values, and controlling the gain of the amplified signal from a predetermined gain curve relating to the gain curve of the amplifier for a second one of the parameter values by adjusting a gain control signal corresponding to a point on the predetermined gain curve as a function of the first one of the parameter values, and applying the adjusted gain control signal to the amplifier. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.
摘要翻译：用于增益控制的系统和技术包括用具有根据参数值的多个增益曲线之一表示的增益的放大器放大信号，该信号在第一个参数值处被放大，并且控制增益通过调整与预定增益曲线上的点相对应的增益控制信号作为参数中的第一个的函数，来从与放大器对于第二参数值的增益曲线相关的预定增益曲线的放大信号值，并将调整后的增益控制信号应用于放大器。要强调的是，该摘要被提供以符合要求摘要的规则，这将允许搜索者或其他读者快速确定技术公开的主题。

24. 发明授权

US06594501B2 Systems and techniques for channel gain computations 失效
标题翻译：通道增益计算的系统和技术
公开(公告)号：US06594501B2
公开(公告)日：2003-07-15
申请号：US10104208
申请日：2002-03-20
申请人： Peter J. Black , Nagabhushana Sindhushayana , Raghu Challa , Rashid Attar
发明人： Peter J. Black , Nagabhushana Sindhushayana , Raghu Challa , Rashid Attar
IPC分类号： H04B700
CPC分类号： H04W52/16 , H04W52/08 , H04W52/10 , H04W52/26 , H04W52/325 , H04W52/36
摘要： Systems and techniques for controlling transmission power involve receiving a first to second channel power ratio, receiving a first to second channel power ratio, adjusting the power ratio if a combined power of a plurality of channels exceeds a threshold, the channels including the first and second channels, and computing gain of the first channel as a function of the power ratio. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.
摘要翻译：用于控制传输功率的系统和技术涉及接收第一至第二信道功率比，接收第一至第二信道功率比，如果多个信道的组合功率超过阈值，则调整功率比，所述信道包括第一和第二信道功率比通道和第一通道的计算增益作为功率比的函数。要强调的是，该摘要被提供以符合要求摘要的规则，这将允许搜索者或其他读者快速确定技术公开的主题。提交它的理解是，它不会用于解释或限制权利要求的范围或含义。

25. 发明申请

US20110105070A1 Direct conversion receiver architecture 有权
标题翻译：直接转换接收机架构
公开(公告)号：US20110105070A1
公开(公告)日：2011-05-05
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： H03L5/00 , H04B1/16
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。

26. 发明申请

US20090245430A1 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：US20090245430A1
公开(公告)日：2009-10-01
申请号：US12400124
申请日：2009-03-09
申请人： Petru Cristian Budianu , Arunava Chaudhuri , Raghu Challa , Kaushik Ghosh , Joseph Victor Zanotelli , Marinal Mahesh Nath , Weihong Jing
发明人： Petru Cristian Budianu , Arunava Chaudhuri , Raghu Challa , Kaushik Ghosh , Joseph Victor Zanotelli , Marinal Mahesh Nath , 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。

27. 发明申请

US20090245192A1 Reconfigurable Wireless Modem Sub-Circuits To Implement Multiple Air Interface Standards 有权
标题翻译：可重构无线调制解调器子电路实现多个空中接口标准
公开(公告)号：US20090245192A1
公开(公告)日：2009-10-01
申请号：US12396270
申请日：2009-03-02
申请人： Arunava Chaudhuri , Iwen Yao , Jeremy H. Lin , Ali Rostampisheh , Raghu Challa , Hamanth Sampath , Min Wu , Joseph Zanotelli , Mrinal M. Nath
发明人： Arunava Chaudhuri , Iwen Yao , Jeremy H. Lin , Ali Rostampisheh , Raghu Challa , Hamanth Sampath , Min Wu , Joseph Zanotelli , Mrinal M. Nath
IPC分类号： H04W88/16 , G06F9/46
CPC分类号： G06F15/7842
摘要： A flexible and reconfigurable digital system (for example, a wireless modem) includes a set of sub-circuits. Each sub-circuit includes a task manager and an amount of configurable hardware circuitry for performing a type of operation on a data stream. The task manager of a sub-circuit can configure and control the configurable hardware of the sub-circuit. A central processor configures and orchestrates operation of the sub-circuits by maintaining a set of task lists in a tightly coupled memory. Each task list includes task instructions for a corresponding sub-circuit. The task manager of a sub-circuit reads task instructions from its task list and controls its associated hardware circuitry as directed by the instructions. A timestamp task instruction and a push task instruction and the task list architecture allow modem sub-circuits to be easily reconfigured to operate in accordance with either a first air interface standard or a second air interface standard.
摘要翻译：灵活和可重新配置的数字系统（例如，无线调制解调器）包括一组子电路。每个子电路包括任务管理器和用于对数据流执行一种操作的可配置硬件电路的量。子电路的任务管理器可以配置和控制子电路的可配置硬件。中央处理器通过在紧耦合存储器中维护一组任务列表来配置和协调子电路的操作。每个任务列表包括相应子电路的任务指令。子电路的任务管理器从其任务列表读取任务指令，并根据指令控制其相关联的硬件电路。时间戳任务指令和推送任务指令以及任务列表架构允许将调制解调器子电路轻松地重新配置为根据第一空中接口标准或第二空中接口标准进行操作。

28. 发明授权

US07586837B2 Acquisition of a gated pilot signal 有权
标题翻译：获取门控导频信号
公开(公告)号：US07586837B2
公开(公告)日：2009-09-08
申请号：US10056920
申请日：2002-01-24
申请人： Mark Roh , Raghu Challa , Serguei A. Glazko
发明人： Mark Roh , Raghu Challa , Serguei A. Glazko
IPC分类号： H04J11/00 , H04B3/10 , H04B1/10 , H04L27/06
CPC分类号： H04B1/7077
摘要： Systems and techniques are disclosed detecting an embedded signal which includes producing a plurality of first correlated values from a portion of the first signal and a second signal, transforming the first correlation values into a plurality of second correlation values related to a frequency content of the first correlation values, and searching for the embedded signal by evaluating the second correlation values. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.
摘要翻译：检测嵌入式信号的系统和技术包括从第一信号和第二信号的一部分产生多个第一相关值，将第一相关值变换成与第一信号的频率内容相关的多个第二相关值相关值，并通过评估第二相关值来搜索嵌入信号。要强调的是，该摘要被提供以符合要求摘要的规则，这将允许搜索者或其他读者快速确定技术公开的主题。提交它的理解是，它不会用于解释或限制权利要求的范围或含义。

29. 发明申请

US20080226001A1 ADJACENT CHANNEL INTERFERENCE DETECTION FOR WIRELESS COMMUNICATION 有权
标题翻译：无线通信的相干通道干扰检测
公开(公告)号：US20080226001A1
公开(公告)日：2008-09-18
申请号：US11686431
申请日：2007-03-15
申请人： Jifeng Geng , Raghu Challa
发明人： Jifeng Geng , Raghu Challa
IPC分类号： H04L5/12
CPC分类号： H04B1/1036
摘要： Techniques for detecting adjacent channel interference (ACI) in a wireless communication system are described. Input inphase (I) and quadrature (Q) samples are filtered with a first filter response to obtain filtered I and Q samples. The first filter response is designed to pass signal in an adjacent frequency channel while suppressing signals in a desired frequency channel and non-adjacent frequency channels. Correlations of the filtered I and Q samples are determined. The presence of ACI is detected based on the correlations of the filtered I and Q samples and the power of the input I and Q samples. If ACI is present, then whether the ACI is from a higher frequency channel or a lower frequency channel is determined based on one or more of the correlations. The input I and Q samples are filtered with a second filter response that is adjusted based on the detection of ACI.
摘要翻译：描述了用于在无线通信系统中检测相邻信道干扰（ACI）的技术。输入同相（I）和正交（Q）样本用第一滤波器响应进行滤波，以获得滤波的I和Q样本。第一滤波器响应被设计为在相邻频率信道中传递信号，同时抑制期望频率信道和非相邻频率信道中的信号。确定滤波的I和Q样品的相关性。基于滤波I和Q采样的相关性和输入I和Q采样的功率来检测ACI的存在。如果存在ACI，则基于一个或多个相关性来确定ACI是来自较高频率信道还是较低频率信道。输入I和Q样本用基于ACI检测进行调整的第二滤波器响应进行滤波。

30. 发明授权

US07088955B2 Method and apparatus for acquiring and tracking pilots in a CDMA communication system 有权
公开(公告)号：US07088955B2
公开(公告)日：2006-08-08
申请号：US09972514
申请日：2001-10-05
申请人： Raghu Challa , Gilbert Christopher Sih
发明人： Raghu Challa , Gilbert Christopher Sih
IPC分类号： H04B1/00 , H04B15/00
CPC分类号： H04L27/0014 , H04L2027/0055 , H04L2027/0079 , H04L2027/0087
摘要： Techniques to acquire and track pilots in a CDMA system. In an aspect, frequency acquisition of a number of signal instances (i.e., multipaths) in a received signal may be achieved concurrently based on a frequency control loop (RAFC) maintained for each finger processor of a rake receiver. Upon successful acquisition, frequency tracking of acquired multipaths may be achieved based on a combination of a frequency control loop (VAFC) maintained for an oscillator used for downconverting the received signal and the RAFCs for the finger processors. In a tracking mode, the VAFC tracks the average frequency of the acquired multipaths by adjusting the frequency of the oscillator. The RAFC of each finger processor tracks the residual frequency error (e.g., due to Doppler frequency shift) of the individual acquired multipath by adjusting the frequency of a complex sinusoidal signal used in a rotator within the finger processor.

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