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1. 发明授权

US08605836B2 Automatic gain control for a wireless receiver 失效
标题翻译：无线接收机的自动增益控制
公开(公告)号：US08605836B2
公开(公告)日：2013-12-10
申请号：US11373612
申请日：2006-03-09
申请人： Vinay Murthy , Linbo Li , Raghuraman Krishnamoorthi
发明人： Vinay Murthy , Linbo Li , Raghuraman Krishnamoorthi
IPC分类号： H04L27/08
CPC分类号： H03G7/007 , H03G3/3068 , H03G3/3078 , H03G3/3089 , H04B1/18 , H04L27/2601 , H04L27/2614 , H04L27/2647
摘要： Techniques for performing automatic gain control (AGC) at a wireless receiver are described. The total gain for the wireless receiver is achieved with discrete gain steps for analog circuitry and continuous gain for a digital variable gain amplifier (DVGA). An AGC loop is updated based on power measurements for an output signal from the DVGA. A first gain for the analog circuitry is selected from among multiple discrete gain values based on the AGC loop to maintain the average power of a baseband signal within a predetermined range at an analog-to-digital converter (ADC) input. A second gain for the DVGA is selected based on the AGC loop to maintain the average power of the output signal at a reference power level. The first gain is switched in a manner to avoid saturation of the ADC caused by the baseband signal and to provide switching hysteresis. The AGC may be performed in log domain and with multiple modes.
摘要翻译：描述了在无线接收机处执行自动增益控制（AGC）的技术。无线接收机的总增益通过模拟电路的离散增益步长和数字可变增益放大器（DVGA）的连续增益来实现。基于来自DVGA的输出信号的功率测量来更新AGC环路。基于AGC环路从多个离散增益值中选择模拟电路的第一增益，以将模拟 - 数字转换器（ADC）输入端的基带信号的平均功率维持在预定范围内。基于AGC环路选择DVGA的第二增益，以将输出信号的平均功率维持在参考功率电平。第一增益以避免由基带信号引起的ADC饱和并提供开关滞后的方式进行切换。 AGC可以在对数域和多种模式下执行。

2. 发明授权

US08457064B2 Methods and apparatus for RF handoff in a multi-frequency network 失效
标题翻译：多频网络中RF切换的方法和装置
公开(公告)号：US08457064B2
公开(公告)日：2013-06-04
申请号：US12051758
申请日：2008-03-19
申请人： Binita Gupta , Linbo Li , Raghuraman Krishnamoorthi , Ashok Mantravadi
发明人： Binita Gupta , Linbo Li , Raghuraman Krishnamoorthi , Ashok Mantravadi
IPC分类号： H04W4/00
CPC分类号： H04W36/30 , H04W36/0055 , H04W72/005
摘要： Methods and apparatus for RF handoff in a multi-frequency network. A method includes generating seamless and partially seamless handoff tables for multiplexes carried in a current LOI, wherein the seamless and partially seamless handoff tables comprise neighboring RF channels carrying one or more of the multiplexes in the current LOI, detecting a handoff event initiated by acquisition failures on a current RF, selecting a selected RF channel from the seamless and partially seamless handoff tables, and performing a handoff to the selected RF channel. An apparatus includes processing logic configured to generate the seamless and partially seamless handoff tables, detect a handoff event initiated by acquisition failures on a current RF, and select a selected RF channel from the seamless and partially seamless handoff tables. The apparatus also includes channel switch logic configured to perform a handoff to the selected RF channel.
摘要翻译：多频网络中RF切换的方法和装置。一种方法包括为当前LOI中携带的多路复用产生无缝和部分无缝切换表，其中无缝和部分无缝切换表包括在当前LOI中携带一个或多个多路复用的相邻RF信道，检测由采集失败发起的切换事件在当前RF上，从无缝和部分无缝切换表中选择所选择的RF信道，以及对所选择的RF信道执行切换。一种装置包括处理逻辑，其被配置为生成无缝和部分无缝切换表，检测由当前RF获取故障引发的切换事件，以及从无缝和部分无缝切换表中选择所选择的RF信道。该装置还包括被配置为执行到所选择的RF信道的切换的信道切换逻辑。

3. 发明授权

US07720185B2 Narrow-band interference canceller 有权
标题翻译：窄带干扰消除器
公开(公告)号：US07720185B2
公开(公告)日：2010-05-18
申请号：US11557035
申请日：2006-11-06
申请人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Linbo Li , Raghuraman Krishnamoorthi , Murali Ramaswamy Chari , Vinay Murthy
发明人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Linbo Li , Raghuraman Krishnamoorthi , Murali Ramaswamy Chari , Vinay Murthy
IPC分类号： H04B1/10
CPC分类号： H04L25/03044 , H04B1/1036 , H04B1/109 , H04B15/00 , H04B2215/061 , H04L2025/03477
摘要： The disclosure is directed to a receiver. The receiver includes an interference canceller configured to filter digital samples produced from a modulated signal transmitted over a wireless channel, and a digital variable gain amplifier (DVGA) configured to amplify the filtered digital samples.
摘要翻译：本公开涉及一种接收机。接收机包括被配置为对通过无线信道传输的调制信号产生的数字样本进行滤波的干扰消除器，以及被配置成放大经滤波的数字样本的数字可变增益放大器（DVGA）。

4. 发明申请

US20090016380A1 Methods and Apparatus for RF Channel Switching in a Multi-Frequency Network 失效
标题翻译：用于多频网络中RF信道切换的方法和装置
公开(公告)号：US20090016380A1
公开(公告)日：2009-01-15
申请号：US12051209
申请日：2008-03-19
申请人： Binita Gupta , An Mei Chen , Devarshi Shah , Linbo Li , Raghuraman Krishnamoorthi , Ashok Mantravadi , Taoufik Tani
发明人： Binita Gupta , An Mei Chen , Devarshi Shah , Linbo Li , Raghuraman Krishnamoorthi , Ashok Mantravadi , Taoufik Tani
IPC分类号： H04J1/00
CPC分类号： H04W76/11 , H04W48/12 , H04W72/02 , H04W76/15
摘要： Methods and apparatus for RF channel switching in a multi-frequency network. In an aspect, a method includes identifying a multiplex set that comprises one or more content flows, wherein the multiplex set is one of a vertical multiplex (VM) set and a unified multiplex (UM) set, generating an overhead message that associates one or more RF carrier frequencies with the one or more content flows, and transmitting the overhead message over the multi-frequency network. An apparatus includes input logic configured to receive an overhead message that associates one or more content flows with one or more RF carrier frequencies, and processing logic configured to detect a channel switch event that identifies a selected content flow, determine a selected RF carrier frequency associated with the selected content flow based on the overhead message, and switch to the selected RF carrier frequency to receive the selected content flow.
摘要翻译：多频网络中RF信道切换的方法和装置。一方面，一种方法包括识别包括一个或多个内容流的多路复用集合，其中多路复用集合是垂直多路复用（VM）集合和统一多路复用（UM）集合之一，生成将开销消息与一个或多个内容流相关联的开销消息，具有一个或多个内容流的更多RF载波频率，以及通过多频网络发送开销消息。一种装置包括输入逻辑，其被配置为接收将一个或多个内容流与一个或多个RF载波频率相关联的开销消息，以及被配置为检测识别所选内容流的信道切换事件的处理逻辑，确定所选择的RF载波频率相关联所选择的内容流程基于开销消息，并且切换到所选择的RF载波频率以接收所选择的内容流。

5. 发明申请

US20070115801A1 Switching diversity in broadcast OFDM systems based on multiple receive antennas 有权
标题翻译：基于多个接收天线的广播OFDM系统中的交换分集
公开(公告)号：US20070115801A1
公开(公告)日：2007-05-24
申请号：US11521701
申请日：2006-09-15
申请人： Linbo Li , Ashok Mantravadi , Fuyun Ling
发明人： Linbo Li , Ashok Mantravadi , Fuyun Ling
IPC分类号： H04J11/00
CPC分类号： H04B7/0404 , H04B7/0805 , H04B7/0808 , H04B7/0811 , H04B7/0814 , H04B7/0857 , H04B7/0874 , H04L1/0003 , H04L1/0057 , H04L1/0066 , H04L25/022 , H04L27/2647 , H04W72/085
摘要： Systems and methods are provided for enhancing signal quality at receivers in a wireless network. In one embodiment, an antenna is selected from a subset of antennas based on a signal quality parameter such as received signal power or signal-to-noise ratio (SNR). In another embodiment, multiple antennas are applied to independent signal processing paths for the respective antennas where output from the paths is then combined to enhance overall signal quality at the receiver.
摘要翻译：提供了用于在无线网络中的接收机处提高信号质量的系统和方法。在一个实施例中，基于诸如接收信号功率或信噪比（SNR）的信号质量参数从天线子集中选择天线。在另一个实施例中，多个天线被施加到各个天线的独立信号处理路径，其中来自路径的输出然后被组合以增强接收机处的整体信号质量。

6. 发明申请

US20160366691A1 POWER ALLOCATION FOR SUPERPOSITION TRANSMISSION 审中-公开
标题翻译：超级分配传输的功率分配
公开(公告)号：US20160366691A1
公开(公告)日：2016-12-15
申请号：US15014800
申请日：2016-02-03
申请人： Hyukjoon KWON , Sandeep KRISHNAMURTHY , Linbo LI , Jungwon LEE
发明人： Hyukjoon KWON , Sandeep KRISHNAMURTHY , Linbo LI , Jungwon LEE
IPC分类号： H04W72/04
CPC分类号： H04L27/3405 , H04L1/0001 , H04L1/0003 , H04L1/0009 , H04L1/007 , H04L5/003 , H04L27/18 , H04L27/3411 , H04W72/0473
摘要： Apparatuses, systems, and methods are described for power allocation in a superposition multiple access communication system capable of using non-uniform joint constellations or super-constellations. In one method, the conditional probability of a correctly-received symbol and a normalized weighting coefficient is calculated for each receiver and then the sum of weighted efficiencies is calculated. The optimal power allocation is determined for each receiver by maximizing the sum of weighted spectral efficiencies.
摘要翻译：描述了能够使用不均匀联合星座或超星座的叠加多址通信系统中的功率分配的装置，系统和方法。在一种方法中，针对每个接收机计算正确接收的符号和归一化加权系数的条件概率，然后计算加权效率之和。通过最大化加权频谱效率之和，为每个接收机确定最佳功率分配。

7. 发明授权

US08442160B2 Adaptive time-filtering for channel estimation in OFDM system 有权
标题翻译： OFDM系统中信道估计的自适应时间滤波
公开(公告)号：US08442160B2
公开(公告)日：2013-05-14
申请号：US12939118
申请日：2010-11-03
申请人： Linbo Li , Ashok Mantravadi , Fuyun Ling , Krishna Kiran Mukkavilli
发明人： Linbo Li , Ashok Mantravadi , Fuyun Ling , Krishna Kiran Mukkavilli
IPC分类号： H04L27/06
CPC分类号： H04L25/0232 , H04L25/022
摘要： Time filtering channel estimates in a wireless communication system, such as an Orthogonal Frequency Division Multiplex (OFDM) system, can be used to improve the quality of channel estimates. The characteristics of an optimal channel estimate time filter can depend on the manner in which the channel estimate is determined as well as the time correlation of channel estimates. A receiver can implement an adaptive time filter for channel estimates in which the time filter response can vary based on channel estimate parameters. The channel estimate parameters can include the manner of determining channel estimates, a time correlation of channel estimates, and an estimated Doppler frequency. The time filter response can be varied continuously over a range of responses or can be varied discretely over a predetermined number of time filter responses.
摘要翻译：在诸如正交频分复用（OFDM）系统的无线通信系统中的时间滤波信道估计可以用于提高信道估计的质量。最优信道估计时间滤波器的特征可以取决于信道估计的方式以及信道估计的时间相关性。接收机可以实现用于信道估计的自适应时间滤波器，其中时间滤波器响应可以基于信道估计参数而变化。信道估计参数可以包括确定信道估计的方式，信道估计的时间相关性和估计的多普勒频率。时间滤波器响应可以在响应范围内连续变化，或者可以在预定数量的时间滤波器响应上离散变化。

8. 发明授权

US08433016B2 Narrow-band interference canceller 有权
标题翻译：窄带干扰消除器
公开(公告)号：US08433016B2
公开(公告)日：2013-04-30
申请号：US12780600
申请日：2010-05-14
申请人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Linbo Li , Raghuraman Krishnamoorthi , Murali Ramaswamy Chari , Vinay Murthy
发明人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Linbo Li , Raghuraman Krishnamoorthi , Murali Ramaswamy Chari , Vinay Murthy
IPC分类号： H04B1/10
CPC分类号： H04L25/03044 , H04B1/1036 , H04B1/109 , H04B15/00 , H04B2215/061 , H04L2025/03477
摘要： The disclosure is directed to a receiver, and methods therefor, including an automatic gain control circuit with a first digital variable gain amplifier that outputs digital samples based on a modulated wireless signal, an interference canceller configured to filter the digital samples using a least mean squares algorithm to reduce narrowband interference, and a second DVGA configured to amplify the filtered digital samples.
摘要翻译：本发明涉及一种接收机及其方法，包括具有基于调制无线信号输出数字样本的第一数字可变增益放大器的自动增益控制电路，被配置为使用最小均方对数字采样进行滤波的干扰消除器算法来减少窄带干扰，第二个DVGA被配置为放大经滤波的数字样本。

9. 发明申请

US20110051618A1 ADAPTIVE TIME-FILTERING FOR CHANNEL ESTIMATION IN OFDM SYSTEM 有权
标题翻译： OFDM系统中信道估计的自适应时间滤波
公开(公告)号：US20110051618A1
公开(公告)日：2011-03-03
申请号：US12939118
申请日：2010-11-03
申请人： Linbo Li , Ashok Mantravadi , Fuyun Ling , Krishna Kirna Mukkavilli
发明人： Linbo Li , Ashok Mantravadi , Fuyun Ling , Krishna Kirna Mukkavilli
IPC分类号： H04W24/00 , H04L27/28
CPC分类号： H04L25/0232 , H04L25/022
摘要： Time filtering channel estimates in a wireless communication system, such as an Orthogonal Frequency Division Multiplex (OFDM) system, can be used to improve the quality of channel estimates. The characteristics of an optimal channel estimate time filter can depend on the manner in which the channel estimate is determined as well as the time correlation of channel estimates. A receiver can implement an adaptive time filter for channel estimates in which the time filter response can vary based on channel estimate parameters. The channel estimate parameters can include the manner of determining channel estimates, a time correlation of channel estimates, and an estimated Doppler frequency. The time filter response can be varied continuously over a range of responses or can be varied discretely over a predetermined number of time filter responses.
摘要翻译：在诸如正交频分复用（OFDM）系统的无线通信系统中的时间滤波信道估计可以用于提高信道估计的质量。最优信道估计时间滤波器的特征可以取决于信道估计的方式以及信道估计的时间相关性。接收机可以实现用于信道估计的自适应时间滤波器，其中时间滤波器响应可以基于信道估计参数而变化。信道估计参数可以包括确定信道估计的方式，信道估计的时间相关性和估计的多普勒频率。时间滤波器响应可以在响应范围内连续变化，或者可以在预定数量的时间滤波器响应上离散变化。

10. 发明授权

US07873126B2 Method and system for automatic gain control with intelligent selection of signal samples 失效
标题翻译：智能选择信号样本的自动增益控制方法和系统
公开(公告)号：US07873126B2
公开(公告)日：2011-01-18
申请号：US11397422
申请日：2006-04-03
申请人： Vinay Murthy , Linbo Li , Raghuraman Krishnamoorthi
发明人： Vinay Murthy , Linbo Li , Raghuraman Krishnamoorthi
IPC分类号： H04L27/08
CPC分类号： H03G3/3052
摘要： The disclosure is directed to a mobile communication device that includes automatic gain control (AGC) circuitry. Every n samples of the broadcast signals, an energy estimate of the AGC output signal is used to calculate and update a gain control value. Instead of using all n samples occurring subsequent to a previous gain control value update, only a subset of those n samples are used. In particular the first half of the n samples may be discarded in the energy estimate calculation while only the second half of the n samples may be used.
摘要翻译：本公开涉及包括自动增益控制（AGC）电路的移动通信设备。广播信号的每n个样本，AGC输出信号的能量估计用于计算和更新增益控制值。不是使用在先前的增益控制值更新之后发生的所有n个样本，而是仅使用那些n个采样的子集。特别地，可以在能量估计计算中丢弃n个样本的前半部分，而只能使用n个样本的后半部分。

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