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71. 发明申请

US20080242225A1 APPARATUS AND METHODS FOR TESTING USING MODULATION ERROR RATIO 失效
标题翻译：使用调制错误比例进行测试的装置和方法
公开(公告)号：US20080242225A1
公开(公告)日：2008-10-02
申请号：US11834679
申请日：2007-08-06
申请人： Raghuraman Krishnamoorthi , Thomas Sun , Ashok Mantravadi
发明人： Raghuraman Krishnamoorthi , Thomas Sun , Ashok Mantravadi
IPC分类号： H04B17/02
CPC分类号： H04L1/206 , H04L1/24 , H04L27/2626 , H04L2001/0097
摘要： Apparatus and methods are disclosed for testing or qualifying a repeater/transmitter in a multicarrier system by utilizing modulation error ratio (MER). In particular, a disclosed method includes determining an estimated effective modulation error ratio of an output of the repeater/transmitter. The estimated effective modulation error ratio is compared with a predetermined threshold, and the repeater/transmitter is qualified when the estimated effective modulation error ratio is greater than the predetermined threshold. Using an estimated modulation error ratio for repeater/transmitters, which can have non-flat modulation error ratios over a total number of subcarriers, affords an efficient method to test and qualify repeater/transmitters.
摘要翻译：公开了用于通过利用调制误差比（MER）在多载波系统中测试或限定中继器/发射机的装置和方法。具体地，所公开的方法包括确定中继器/发射机的输出的估计有效调制误差比。将估计的有效调制误差比与预定阈值进行比较，并且当估计的有效调制误差比大于预定阈值时，中继器/发射机被限定。对于可能在副载波总数上具有非平坦调制误差比的中继器/发射机使用估计的调制误差率，提供了测试和限定中继器/发射机的有效方法。

72. 发明申请

US20070243837A1 Pilot modulation error ratio for evaluation of transmitter performance 失效
标题翻译：用于评估发射机性能的导频调制误码率
公开(公告)号：US20070243837A1
公开(公告)日：2007-10-18
申请号：US11444204
申请日：2006-05-30
申请人： Raghuraman Krishnamoorthi , Thomas Sun
发明人： Raghuraman Krishnamoorthi , Thomas Sun
IPC分类号： H04B17/00
CPC分类号： H04L1/206 , H04L25/022 , H04L25/0232 , H04L25/0236 , H04L27/0012 , H04L27/2601
摘要： Systems and methodologies are described that facilitate monitoring transmitter performance in a wireless communication environment. A metric or metrics associated with one or more pilot symbols can be generated and used to evaluate performance. To generate pilot metrics, a signal analyzer can be used to sample the output of a transmitter and the sampled signal can be propagated to a processor. The processor can generate frequency domain channel estimates for subcarriers. Average channel estimates for the subcarriers can be used with the known pilot symbols to determine noise or error for each subcarrier, which can be used to generate the noise variance for each of the pilot symbols. A pilot modulation error metric can be generated based upon the average channel estimates and noise variance.
摘要翻译：描述了便于在无线通信环境中监视发射机性能的系统和方法。可以生成与一个或多个导频符号相关联的度量或度量，以用于评估性能。为了产生导频指标，可以使用信号分析器对发射机的输出进行采样，并且采样信号可以传播到处理器。处理器可以为子载波生成频域信道估计。子载波的平均信道估计可以与已知导频符号一起使用以确定每个子载波的噪声或误差，其可用于为每个导频符号生成噪声方差。可以基于平均信道估计和噪声方差来产生导频调制误差度量。

73. 发明申请

US20070239815A1 PIPELINE FFT ARCHITECTURE AND METHOD 审中-公开
标题翻译：管道FFT架构和方法
公开(公告)号：US20070239815A1
公开(公告)日：2007-10-11
申请号：US11696111
申请日：2007-04-03
申请人： Kevin Cousineau , Raghuraman Krishnamoorthi
发明人： Kevin Cousineau , Raghuraman Krishnamoorthi
IPC分类号： G06F17/14
CPC分类号： G06F17/142 , H04L25/0228 , H04L27/263 , H04L27/265 , H04L27/2656
摘要： Techniques for performing Fast Fourier Transforms (FFT) are described. In some aspects, calculating the Fast Fourier Transform is achieved with an apparatus having a memory (610), a Fast Fourier Transform engine (FFTe) having one or more registers (650) and a delayless pipeline (630), the FFTe configured to receive a multi-point input from the main memory (610), store the received input in at least one of the one or more registers (650), and compute either or both of a Fast Fourier Transform (FFT) and an Inverse Fast Fourier Transform (IFFT) on the input using the delayless pipeline.
摘要翻译：描述用于执行快速傅里叶变换（FFT）的技术。在一些方面，使用具有存储器（610），具有一个或多个寄存器（650）和无延迟流水线（630）的快速傅里叶变换引擎（FFTe）的装置来实现计算快速傅立叶变换，FFTe被配置为接收来自主存储器（610）的多点输入将所接收的输入存储在一个或多个寄存器（650）中的至少一个寄存器（650）中，并且计算快速傅里叶变换（FFT）和快速傅立叶逆变换（IFFT）使用无延迟管道输入。

74. 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。

75. 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.

76. 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。

77. 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。

78. 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。

79. 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。

80. 发明授权

US08625474B2 System and method for the simultaneous reception of FLO and FLO-EV data 失效
标题翻译：同时接收FLO和FLO-EV数据的系统和方法
公开(公告)号：US08625474B2
公开(公告)日：2014-01-07
申请号：US12876950
申请日：2010-09-07
申请人： Raghuraman Krishnamoorthi , Krishna K. Mukkavilli , Bojan Vrcelj
发明人： Raghuraman Krishnamoorthi , Krishna K. Mukkavilli , Bojan Vrcelj
IPC分类号： H04B7/00
CPC分类号： H04H60/91 , H04N21/42615 , H04N21/4382 , H04N21/4383 , H04W72/005 , H04W72/1273
摘要： A system for receiving data includes a receiver configured to receive a radio frequency communication signal comprising at least one superframe, the at least one superframe having at least a first data stream and a second data stream encoded therein, wherein the receiver decodes at least one of the first data stream and the second data stream.
摘要翻译：一种用于接收数据的系统，包括：接收机，被配置为接收包括至少一个超帧的射频通信信号，所述至少一个超帧具有至少第一数据流和在其中编码的第二数据流，其中接收机解码至少一个第一数据流和第二数据流。

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