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111. 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。

112. 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。

113. 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。

114. 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。

115. 发明授权

US08477809B2 Systems and methods for generalized slot-to-interlace mapping 有权
标题翻译：用于广义时隙到交错映射的系统和方法
公开(公告)号：US08477809B2
公开(公告)日：2013-07-02
申请号：US11834671
申请日：2007-08-06
申请人： Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Rajiv Vijayan
发明人： Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Rajiv Vijayan
IPC分类号： H04J3/06 , H04J9/00 , H04W4/00 , H04L27/28
CPC分类号： H04L5/0048 , H04L5/0007 , H04L5/0044 , H04L25/0224
摘要： A transmitter or receiver device includes a processing system configured to have one or more pilot interlace vectors and one or more distance vectors. The processing system is further configured to generate a first slot interlace for a first slot based on the one or more pilot interlace vectors, and is further configured to generate a second slot interlace for a second slot based on the first slot interlace and the one or more distance vectors. Additional slot interlaces for all other slots may also be generated based on the first slot interlace and the one or more distance vectors.
摘要翻译：发射机或接收机设备包括被配置为具有一个或多个导频交织向量和一个或多个距离向量的处理系统。所述处理系统还被配置为基于所述一个或多个导频交错向量来生成用于第一时隙的第一时隙交织，并且还被配置为基于所述第一时隙交织和所述第一时隙交织而生成用于第二时隙的第二时隙交织，更多距离矢量。也可以基于第一时隙交错和一个或多个距离矢量来生成用于所有其他时隙的附加时隙交织。

116. 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。

117. 发明申请

US20100157833A1 METHODS AND SYSTEMS FOR IMPROVED TIMING ACQUISITION FOR VARYING CHANNEL CONDITIONS 审中-公开
标题翻译：改进通道条件改进时间采集的方法和系统
公开(公告)号：US20100157833A1
公开(公告)日：2010-06-24
申请号：US12644909
申请日：2009-12-22
申请人： BOJAN VRCELJ , Krishna K. Mukkavilli , Raghuraman Krishnamoorthi , Vinay Murthy
发明人： BOJAN VRCELJ , Krishna K. Mukkavilli , Raghuraman Krishnamoorthi , Vinay Murthy
IPC分类号： H04L12/26
CPC分类号： H04L27/2675 , H04L5/0048 , H04L7/08 , H04L27/2626 , H04L27/2665 , H04L27/2688 , H04L27/2692 , H04L27/2695
摘要： An improved receiver apparatus and acquisition algorithm using TDM pilots is disclosed. The timing acquisition method presented provides capabilities for adapting to changing channel conditions, in particular varying expected delay spreads. The information on an expected delay spread can be fed back to the initial acquisition algorithm based on previous successful attempts, and the delay spreads measured at that time, such as to set the length of the detection window used to in the TDM pilot processing. Based on the delay spread information, the algorithm for processing the specialized TDM pilot can adaptively modify the timing acquisition parameters for more robust performance under interference conditions. This may involve reducing the length of the detection window to just a little more than or equal to the maximum expected delay spread, which reduces sensitivity of the fine timing acquisition to signal noise.
摘要翻译：公开了一种使用TDM导频的改进的接收机设备和采集算法。提出的定时获取方法提供了适应不断变化的信道条件，特别是改变预期延迟传播的能力。关于期望延迟扩展的信息可以基于先前的成功尝试反馈到初始捕获算法，并且在那时测量的延迟扩展，例如设置在TDM导频处理中使用的检测窗口的长度。基于延迟扩展信息，用于处理专用TDM导频的算法可以自适应地修改定时获取参数，以在干扰条件下实现更强的性能。这可能涉及将检测窗口的长度减小到大于或等于最大预期延迟扩展的一点，这降低了精确定时采集对信号噪声的灵敏度。

118. 发明授权

US07551545B2 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：US07551545B2
公开(公告)日：2009-06-23
申请号：US10775719
申请日：2004-02-09
申请人： Raghuraman Krishnamoorthi
发明人： Raghuraman Krishnamoorthi
IPC分类号： H04J11/00
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个数据子带的组Nc个接收符号，其中Nc.L = N和L> 1。对于部分傅里叶变换，N个输入样本用相量旋转以获得N个旋转的输入样本，其被累积（对于每组L个样本）以获得Nc个时域值。对Nc时域值执行Nc点FFT以获得Nc个接收符号。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。

119. 发明申请

US20060248135A1 Fast fourier transform twiddle multiplication 失效
标题翻译：快速傅立叶变换旋转乘法
公开(公告)号：US20060248135A1
公开(公告)日：2006-11-02
申请号：US11373433
申请日：2006-03-10
申请人： Kevin Cousineau , Raghuraman Krishnamoorthi
发明人： Kevin Cousineau , Raghuraman Krishnamoorthi
IPC分类号： G06F17/14
CPC分类号： H04L5/0064 , G06F17/142 , H04L5/0007 , H04L5/0048 , H04L5/0083 , H04L25/022 , H04L25/0226 , H04L27/265 , H04L27/2656
摘要： An FFT engine implementing a cycle count method of applying twiddle multiplications in multi-stages. When implementing a multistage FFT, the intermediate values need to be multiplied by various twiddle factors. The FFT engine utilizes a minimal number of multipliers to perform the twiddle multiplications in an efficient pipeline. Optimizing a number of complex multipliers based on an FFT radix and a number of values in each row of memory allows the FFT function to be performed using a reasonable amount of area and in a minimal number of cycles. Strategic ordering and grouping of the values allows the FFT operation to be performed in a fewer number of cycles.
摘要翻译：实现循环计数法的FFT引擎，用于多阶段应用旋转乘法。当实现多级FFT时，中间值需要乘以各种旋转因子。 FFT引擎利用最少数量的乘法器在有效的管道中执行旋转乘法。基于每一行存储器中的FFT基数和多个值来优化多个复数乘法器允许使用合理的面积和最小数量的周期来执行FFT功能。这些值的策略排序和分组允许以更少的周期执行FFT运算。

120. 发明申请

US20060227910A1 Receiver DC offset correction 审中-公开
标题翻译：接收机DC偏移校正
公开(公告)号：US20060227910A1
公开(公告)日：2006-10-12
申请号：US11373611
申请日：2006-03-09
申请人： Nangavalli Ramasubramanian , Raghuraman Krishnamoorthi , Krishna Mukkavilli
发明人： Nangavalli Ramasubramanian , Raghuraman Krishnamoorthi , Krishna Mukkavilli
IPC分类号： H03D1/04
CPC分类号： H04L25/06 , H03D3/006 , H03D3/008 , H04B1/30 , H04L27/38
摘要： A system and method are provided for correcting direct current (dc) offset in a wireless communications receiver. The method disconnects the mixer signal input from a received communication signal in an initialization state. An analog signal is accepted from the mixer output and converted into digital signal. A fine correction value is generated and subtracted from the digital signal. Thus, the digital signal amplitude in minimized in response to the initial fine correction value. In a communication state, the communication signals are received at the mixer signal input. The fine correction value is subtracted from a converted digital communication signal, so that the digital communication signal is supplied with a fine corrected dc offset. The method may also generate a coarse correction value to adjust mixer current in the initialization state, and a tracking correction value in the communication state.
摘要翻译：提供了用于校正无线通信接收机中的直流（dc）偏移的系统和方法。该方法在初始化状态下断开来自接收到的通信信号的混频信号输入。模拟信号从混频器输出接受并转换为数字信号。产生精细校正值并从数字信号中减去。因此，响应于初始精细校正值而最小化的数字信号幅度。在通信状态下，在混频器信号输入端接收通信信号。从转换的数字通信信号中减去精细校正值，从而向数字通信信号提供精细校正的直流偏移。该方法还可以产生粗调校正值以调整初始化状态下的混频器电流，以及通信状态下的跟踪校正值。

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