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91. 发明申请

US20070232251A1 Method and system for automatic gain control during signal acquisition 失效
标题翻译：信号采集过程中自动增益控制的方法和系统
公开(公告)号：US20070232251A1
公开(公告)日：2007-10-04
申请号：US11397256
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： H04B1/18
CPC分类号： H03G3/3052
摘要： The disclosure is directed to a mobile communication device that includes automatic gain control (AGC) circuitry and operates in either a tracking mode or an acquisition mode. A received signal is sampled n times to calculate an energy estimate that is used to set the gain control values within the AGC circuitry. The value of n varies depending on whether the handset is operating in the acquisition mode or the tracking mode. Acquisition mode is typically considered to be the mode prior to coarse timing acquisition, also referred to as frame acquisition.
摘要翻译：本公开涉及包括自动增益控制（AGC）电路并且以跟踪模式或采集模式操作的移动通信设备。接收到的信号被采样n次以计算用于设置AGC电路内的增益控制值的能量估计。 n的值根据手机在采集模式或跟踪模式下的运行而变化。采集模式通常被认为是粗略定时采集之前的模式，也称为帧采集。

92. 发明申请

US20060222118A1 Automatic gain control for a wireless receiver 失效
公开(公告)号：US20060222118A1
公开(公告)日：2006-10-05
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.

93. 发明申请

US20060215777A1 Partial FFT processing and demodulation for a system with multiple subcarriers 有权
标题翻译：具有多个子载波的系统的部分FFT处理和解调
公开(公告)号：US20060215777A1
公开(公告)日：2006-09-28
申请号：US11372397
申请日：2006-03-08
申请人： Raghuraman Krishnamoorthi
发明人： Raghuraman Krishnamoorthi
IPC分类号： H04K1/10
CPC分类号： H04L27/265 , G06F17/142 , H04L5/023 , H04L25/022 , H04L27/2633
摘要： Techniques for efficiently performing partial FFT for subcarriers of interest are described. The N total subcarriers may be arranged into M sets. Each set may contain K subcarriers uniformly distributed across the N total subcarriers, where M·K=N. For the partial FFT, pre-processing is initially performed on time-domain samples to obtain intermediate samples. The pre-processing may include performing M-point FFTs on the time-domain samples and multiplying the FFT outputs with unit complex values. For each set of subcarriers of interest, a K-point FFT is performed on a set of intermediate samples to obtain a set of frequency-domain symbols for that set of subcarriers. Since K is typically much smaller than N, substantial savings in computation and power may be realized when only one or few sets of subcarriers are of interest.
摘要翻译：描述了用于对感兴趣的子载波进行部分FFT的有效执行的技术。 N个总副载波可以被布置成M组。每个集合可以包含均匀分布在N个总子载波上的K个子载波，其中M.K = N。对于部分FFT，首先对时域采样进行预处理，以获得中间样本。预处理可以包括对时域采样执行M点FFT，并将FFT输出与单位复数值相乘。对于感兴趣的每组子载波，对一组中间采样执行K点FFT，以获得该组子载波的频域符号集合。由于K通常比N小得多，所以当只有一组或几组副载波感兴趣时，可以实现计算和功率的显着节省。

94. 发明申请

US20050182806A1 FFT architecture and method 失效
标题翻译： FFT架构和方法
公开(公告)号：US20050182806A1
公开(公告)日：2005-08-18
申请号：US11002478
申请日：2004-12-01
申请人： Raghuraman Krishnamoorthi , Chinnappa Ganapathy
发明人： Raghuraman Krishnamoorthi , Chinnappa Ganapathy
IPC分类号： G06F15/00 , G06F17/14 , H04L27/26
CPC分类号： G06F17/142 , H04L27/265
摘要： A Fast Fourier Transform (FFT) hardware implementation and method provides efficient FFT processing while minimizing the die area needed in an Integrated Circuit (IC). The FFT hardware can implement an N point FFT, where N=rn is a function of a radix (r). The hardware implementation includes a sample memory having N/r rows, each storing r samples. A twiddle factor memory can store k twiddle factors per row, where 0
摘要翻译：快速傅里叶变换（FFT）硬件实现和方法提供了有效的FFT处理，同时最小化集成电路（IC）所需的管芯面积。 FFT硬件可以实现N点FFT，其中N = r 是小数（r）的函数。硬件实现包括具有N / r行的采样存储器，每个存储r个样本。旋转因子存储器可以存储每行的k个旋转因子，其中0 次，然后重复n级以产生N点FFT。

95. 发明申请

US20050174931A1 Subband-based demodulation for an OFDM-based communication system 有权
标题翻译：基于OFDM的通信系统的基于子带的解调
公开(公告)号：US20050174931A1
公开(公告)日：2005-08-11
申请号：US10775719
申请日：2004-02-09
申请人： Raghuraman Krishnamoorthi
发明人： Raghuraman Krishnamoorthi
IPC分类号： G06F17/14 , H04L25/02 , H04L27/26 , H04J11/00 , H04Q11/00
CPC分类号： G06F17/142 , H04L25/0204 , H04L25/0226 , H04L27/2633 , H04L27/265
摘要： For subband-based OFDM demodulation, a “partial” Fourier transform is performed on a sequence of N input samples for an OFDM symbol to obtain Nc received symbols for a group of Nc data subbands, where Nc·L=N and L>1. For the partial Fourier transform, the N input samples are rotated with a phasor to obtain N rotated input samples, which are accumulated (for each set of L samples) to obtain Nc time-domain values. An Nc-point FFT is performed on the NC time-domain values to obtain the Nc received symbols. Channel gain estimates for the data subbands are also obtained, for example, by performing a partial Fourier transform to obtain received pilot symbols, an inverse FFT to obtain time-domain channel gain values, and an FFT to obtain channel gain estimates for the data subbands. The received symbols are processed with (e.g., equalized by) the channel gain estimates to obtain recovered data symbols.
摘要翻译：对于基于子带的OFDM解调，对OFDM符号的N个输入样本的序列执行“部分”傅里叶变换，以获得N C 1的组的接收符号， SUB>数据子带，其中N C1 = L，L> 1。对于部分傅立叶变换，N个输入样本以相量旋转以获得N个旋转的输入样本，其累加（对于每组L个样本）以获得N个时域值。对NC时域值执行N次点FFT以获得接收到的N个符号。也可以例如通过执行部分傅立叶变换来获得接收到的导频符号，获得时域信道增益值的逆FFT和获得数据子带的信道增益估计的FFT来获得数据子带的信道增益估计。接收到的符号用信道增益估计进行（例如，均衡）处理以获得恢复的数据符号。

96. 发明授权

US09036937B2 Fast repeated integral images 有权
标题翻译：快速重复积分图像
公开(公告)号：US09036937B2
公开(公告)日：2015-05-19
申请号：US13230775
申请日：2011-09-12
申请人： Ming-Chang Tsai , Pawan K. Baheti , Murali R. Chari , Raghuraman Krishnamoorthi
发明人： Ming-Chang Tsai , Pawan K. Baheti , Murali R. Chari , Raghuraman Krishnamoorthi
IPC分类号： G06K9/40 , G06T5/20
CPC分类号： G06T5/20
摘要： A repeated integral images method filters image data in only two passes, e.g., the first pass filters horizontal rows of pixels and a second pass filters vertical columns of pixels, or in a single pass. The filter performs at least one infinite impulse response (IIR) filter and at least one finite impulse response (FIR) filter on the image data. A plurality of IIR filters and FIR filters maybe performed to approximate a Gaussian filter. By minimizing the number of passes, the data flow between the processing unit and the storage unit is greatly reduced compared to conventional repeated integral images method thereby improving computation time.
摘要翻译：重复的积分图像方法仅在两遍中对图像数据进行滤波，例如，第一遍滤波器是水平行像素，第二遍滤波垂直列的像素，或者单次通过。滤波器对图像数据执行至少一个无限脉冲响应（IIR）滤波器和至少一个有限脉冲响应（FIR）滤波器。可以执行多个IIR滤波器和FIR滤波器以近似高斯滤波器。通过最小化通过次数，与传统的重复积分图像方法相比，处理单元和存储单元之间的数据流大大减少，从而改善了计算时间。

97. 发明授权

US08611325B2 Method and apparatus for plug-and-play venue-cast co-channel with wide-area network 有权
标题翻译：具有广域网的即插即用场合播放方式和装置
公开(公告)号：US08611325B2
公开(公告)日：2013-12-17
申请号：US12570577
申请日：2009-09-30
申请人： Peter John Black , Matthew Stuart Grob , Raghuraman Krishnamoorthi , Mingxi Fan , Jiming Guo
发明人： Peter John Black , Matthew Stuart Grob , Raghuraman Krishnamoorthi , Mingxi Fan , Jiming Guo
IPC分类号： H04B7/216 , H04W4/00 , H04L12/66 , H04J3/16 , G06F3/00
CPC分类号： H04W72/005 , H04L65/4076 , H04N7/173 , H04N21/21805 , H04N21/41407 , H04N21/6131 , H04W72/12
摘要： A system, method, and apparatus for providing venue-cast service in a wireless access network are disclosed. A local transmitter can request reservation of air link resources on the wireless access network for a venue-cast transmission. The local transmitter can receive a forward link signal with a timing reference for data transmitted on the wireless access network such as, for example, the forward link signal in an EV-DO network or a FLO-based media distribution system. Based on the timing reference, the local transmitter can transmit venue-cast information in a same frequency band as the forward link signal utilizing the reserved air link resources. Optionally, the venue-cast system can include a collocated network repeater and the local transmitter can synchronize its timing and transmit power to the forward link signal from the repeater.
摘要翻译：公开了一种用于在无线接入网络中提供场所播送业务的系统，方法和装置。本地发射机可以请求预留无线接入网上的空中链路资源进行场地播送。本地发射机可以接收具有用于在无线接入网络上传输的数据的定时参考的前向链路信号，例如EV-DO网络或基于FLO的媒体分发系统中的前向链路信号。基于定时参考，本地发射机可以利用预留的空中链路资源在与前向链路信号相同的频带中发送场所播送信息。可选地，场地播放系统可以包括并置的网络中继器，并且本地发射机可以将其定时同步并且向来自中继器的前向链路信号发送功率。

98. 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。

99. 发明授权

US08250428B2 Scheduling data with time diversity in flow systems 有权
标题翻译：在流量系统中调度具有时间多样性的数据
公开(公告)号：US08250428B2
公开(公告)日：2012-08-21
申请号：US12276313
申请日：2008-11-22
申请人： Thomas Sun , Fuyun Ling , Jing Jiang , Raghuraman Krishnamoorthi , Tao Tian , Kent Walker
发明人： Thomas Sun , Fuyun Ling , Jing Jiang , Raghuraman Krishnamoorthi , Tao Tian , Kent Walker
IPC分类号： H03M13/00
CPC分类号： H04L1/0071 , H03M13/27 , H03M13/2957 , H04L1/0041 , H04L2001/0098
摘要： Methods and systems are described for scheduling data in an FLO system. The method may include turbo encoding the data, and dividing a packet of the turbo-coded data into a plurality of subpackets. The method may include scheduling the turbo-coded packet of data so as to distribute the data across multiple frames of a superframe, by transmitting each one of the subpackets during a different frame of the superframe to increase time diversity. The turbo-coded packet of data may comprise systematic bits and parity bits. The method may include separately scheduling the systematic bits and the parity bits during different frames of the superframe.
摘要翻译：描述了用于在FLO系统中调度数据的方法和系统。该方法可以包括对数据进行turbo编码，并将turbo编码数据的分组划分成多个子分组。该方法可以包括通过在超帧的不同帧期间发送每个子分组以增加时间分集来调度数据的turbo编码分组以便分布跨超帧的多个帧的数据。 turbo编码的数据分组可以包括系统比特和奇偶校验比特。该方法可以包括在超帧的不同帧期间单独地调度系统比特和奇偶校验比特。

100. 发明授权

US07746760B2 Frequency error estimation and frame synchronization in an OFDM system 失效
标题翻译： OFDM系统中的频率误差估计和帧同步
公开(公告)号：US07746760B2
公开(公告)日：2010-06-29
申请号：US10754796
申请日：2004-01-08
申请人： Rajiv Vijayan , Alok Kumar Gupta , Raghuraman Krishnamoorthi
发明人： Rajiv Vijayan , Alok Kumar Gupta , Raghuraman Krishnamoorthi
IPC分类号： H04J11/00 , H04J3/06
CPC分类号： H04L27/2656 , H04L27/2657 , H04L27/2675
摘要： Frequency error estimation and frame synchronization are performed at a receiver in an OFDM system based on a metric that is indicative of detected pilot power. The metric may be defined based on cross-correlation between two received symbols obtained in two OFDM symbol periods. For frequency error estimation, a metric value is computed for each of multiple hypothesized frequency errors. The hypothesized frequency error for the metric value with the largest magnitude is provided as the estimated frequency error. For frame synchronization, a correlation value is obtained for each OFDM symbol period by correlating metric values obtained for NC (e.g., most recent) OFDM symbol periods with NC expected values. The expected values are computed in a manner consistent with the manner in which the metric values are computed. Peak detection is performed on the correlation values obtained for different OFDM symbol periods to determine frame synchronization.
摘要翻译：基于指示检测到的导频功率的度量，在OFDM系统中的接收机处执行频率误差估计和帧同步。可以基于在两个OFDM符号周期中获得的两个接收符号之间的互相关来定义度量。对于频率误差估计，针对多个假设的频率误差中的每一个计算度量值。提供具有最大幅度的度量值的假设频率误差作为估计的频率误差。对于帧同步，通过将为NC（例如，最近的）OFDM符号周期获得的度量值与NC预期值相关联，获得每个OFDM符号周期的相关值。以与计算度量值的方式一致的方式计算期望值。对针对不同的OFDM符号周期获得的相关值执行峰值检测以确定帧同步。

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