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1. 发明授权

US08401503B2 Dual-loop automatic frequency control for wireless communication 有权
标题翻译：双回路自动频率控制用于无线通信
公开(公告)号：US08401503B2
公开(公告)日：2013-03-19
申请号：US11358996
申请日：2006-02-21
申请人： Seong Taek Chung , Vinay Murthy , Alok Kumar Gupta , Fuyun Ling
发明人： Seong Taek Chung , Vinay Murthy , Alok Kumar Gupta , Fuyun Ling
IPC分类号： H04B1/18
CPC分类号： H03J7/04 , H03J1/0083
摘要： Techniques for performing frequency control using dual-loop automatic frequency control (AFC) are described. The dual-loop AFC includes an inner loop that corrects short-term frequency variations (e.g., due to Doppler effect) and an outer loop that corrects long-term frequency variations (e.g., due to component tolerances and temperature variations). In one design, a first inner loop is implemented for frequency control of a first system (e.g., a broadcast system), a second inner loop is implemented for frequency control of a second system (e.g., a cellular system), and at least one outer loop is implemented for adjusting a reference frequency used to receive signals from the first and second systems. Each inner loop estimates and corrects the frequency error in an input signal for the associated system and may be enabled when receiving the input signal from the system. The reference frequency may be used for frequency downconversion, sampling and/or other purposes.
摘要翻译：描述了使用双回路自动频率控制（AFC）进行频率控制的技术。双回路AFC包括校正短期频率变化（例如，由于多普勒效应引起的）的内部循环和校正长期频率变化（例如由于部件公差和温度变化）的外部回路。在一种设计中，为第一系统（例如，广播系统）的频率控制实现第一内环，为第二系统（例如，蜂窝系统）的频率控制实现第二内环，并且至少一个实现外部环路，用于调整用于从第一和第二系统接收信号的参考频率。每个内循环估计和校正相关系统的输入信号中的频率误差，并且当从系统接收输入信号时可以使能频率误差。参考频率可用于下变频，采样和/或其他目的。

2. 发明授权

US08009775B2 Automatic frequency control for a wireless communication system with multiple subcarriers 有权
标题翻译：具有多个子载波的无线通信系统的自动频率控制
公开(公告)号：US08009775B2
公开(公告)日：2011-08-30
申请号：US11372931
申请日：2006-03-09
申请人： Vinay Murthy , Alok Kumar Gupta , Seong Taek Chung , Fuyun Ling
发明人： Vinay Murthy , Alok Kumar Gupta , Seong Taek Chung , Fuyun Ling
IPC分类号： H04L27/06 , H04L7/00 , H04L27/00
CPC分类号： G06F1/0353 , H04L5/0007 , H04L5/0048 , H04L27/2659 , H04L27/266 , H04L27/2662 , H04L27/2675 , H04L27/2678
摘要： Techniques for performing frequency control in an OFDM system are described. In one aspect, frequency acquisition is performed based on a received pilot, and frequency tracking is performed based on received OFDM symbols. For frequency acquisition, an initial frequency error estimate may be derived based on the received pilot, and an automatic frequency control (AFC) loop may be initialized with the initial frequency error estimate. For frequency tracking, a frequency error estimate may be derived for each received OFDM symbol, and the AFC loop may be updated with the frequency error estimate. Frequency error in input samples is corrected by the AFC loop with the initial frequency error estimate as well as the frequency error estimate for each received OFDM symbol. In another aspect, a variable number of samples of a received OFDM symbol are selected, e.g., based on the received OFDM symbol timing, for use for frequency error estimation.
摘要翻译：描述在OFDM系统中执行频率控制的技术。在一个方面，基于接收到的导频执行频率采集，并且基于接收的OFDM符号执行频率跟踪。对于频率获取，可以基于接收到的导频来导出初始频率误差估计，并且可以利用初始频率误差估计来初始化自动频率控制（AFC）循环。对于频率跟踪，可以针对每个接收的OFDM符号导出频率误差估计，并且可以用频率误差估计来更新AFC循环。通过具有初始频率误差估计的AFC回路以及每个接收的OFDM符号的频率误差估计来校正输入采样中的频率误差。在另一方面，例如基于所接收的OFDM符号定时，选择接收的OFDM符号的可变数目的样本，以用于频率误差估计。

3. 发明授权

US07720027B2 System and method for a forward link only physical layer 有权
标题翻译：仅用于前向链路物理层的系统和方法
公开(公告)号：US07720027B2
公开(公告)日：2010-05-18
申请号：US11495480
申请日：2006-07-27
申请人： Fuyun Ling , Murali Ramaswamy Chari , Rajiv Vijayan , Ashok Mantravadi , Alok Kumar Gupta , Krishna Kiran Mukkavilli , Michael Mao Wang , Bojan Vrcelj , Bruce Collins
发明人： Fuyun Ling , Murali Ramaswamy Chari , Rajiv Vijayan , Ashok Mantravadi , Alok Kumar Gupta , Krishna Kiran Mukkavilli , Michael Mao Wang , Bojan Vrcelj , Bruce Collins
IPC分类号： H04W4/00
CPC分类号： H04L1/0002 , H04L1/0017 , H04L1/0041 , H04L1/0075 , H04L5/0007 , H04L5/0048 , H04L27/2613 , H04L27/2647 , H04L27/2662 , H04L69/32 , H04W48/08 , H04W72/005 , H04W80/00 , H04W88/02 , H04W92/10
摘要： Systems and methods are provided for processing forward link only (FLO) signals. A device receives a FLO signal, processes a TDM pilot comprising a TDM Pilot 1, a TDM Pilot 2, a WIC, a LIC, a Transition Pilot Channel, and a Positioning Pilot, from the FLO signal, processes an overhead information symbol (OIS) comprising a wide-area OIS and a local-area OIS, from the FLO signal, processes an FDM pilot comprising a wide-area FDM pilot and a local-area FDM pilot, from the FLO signal; and processes data comprising wide-area data and local-area data, from the FLO signal.
摘要翻译：提供系统和方法用于仅处理前向链路（FLO）信号。设备接收FLO信号，从FLO信号处理包括TDM导频1，TDM导频2，WIC，LIC，转换导频信道和定位导频的TDM导频，处理开销信息符号（OIS ）包括来自FLO信号的广域OIS和局域OIS，从FLO信号处理包括广域FDM导频和本地FDM导频的FDM导频; 并从FLO信号处理包括广域数据和局域数据的数据。

4. 发明申请

US20090190675A1 SYNCHRONIZATION IN A BROADCAST OFDM SYSTEM USING TIME DIVISION MULTIPLEXED PILOTS 审中-公开
标题翻译：使用时分多路复用器的广播OFDM系统中的同步
公开(公告)号：US20090190675A1
公开(公告)日：2009-07-30
申请号：US11933231
申请日：2007-10-31
申请人： Fuyun Ling , Alok Kumar Gupta , Raghuraman Krishnamoorthi , Ramaswamy Murali , Murali Ramaswamy Chari , Rajiv Vijayan , Bojan Vrcelj
发明人： Fuyun Ling , Alok Kumar Gupta , Raghuraman Krishnamoorthi , Ramaswamy Murali , Murali Ramaswamy Chari , Rajiv Vijayan , Bojan Vrcelj
IPC分类号： H04L27/28 , H04J3/06
CPC分类号： H04L27/2675 , H04L5/0007 , H04L5/0051 , H04L5/0064 , H04L7/042 , H04L25/0212 , H04L25/0216 , H04L25/0224 , H04L25/0226 , H04L27/2613 , H04L27/2656 , H04L27/2657 , H04L27/2662
摘要： In an OFDM system, a transmitter broadcasts a first TDM pilot on a first set of subbands followed by a second TDM pilot on a second set of subbands in each frame. The subbands in each set are selected from among N total subbands such that (1) an OFDM symbol for the first TDM pilot contains at least S1 identical pilot-1 sequences of length L1 and (2) an OFDM symbol for the second TDM pilot contains at least S2 identical pilot-2 sequences of length L2, where L2>L1, S1·L1=N, and S2·L2=N. The transmitter may also broadcast an FDM pilot. A receiver processes the first TDM pilot to obtain frame timing (e.g., by performing correlation between different pilot-1 sequences) and further processes the second TDM pilot to obtain symbol timing (e.g., by detecting for the start of a channel impulse response estimate derived from the second TDM pilot).
摘要翻译：在OFDM系统中，发射机在第一组子带上广播第一TDM导频，随后在每帧中的第二组子带上接收第二TDM导频。每个组中的子带从N个总子带中选出，使得（1）第一TDM导频的OFDM符号包含长度为L1的至少S1个相同的导频1序列，以及（2）第二TDM导频的OFDM符号包含至少S2个长度为L2的导频-2序列，其中L2> L1，S1.L1 = N，S2.L2 = N。发射机还可以广播FDM导频。接收机处理第一TDM导频以获得帧定时（例如，通过执行不同导频-1序列之间的相关）并且进一步处理第二TDM导频以获得符号定时（例如，通过检测导出的信道脉冲响应估计的开始从第二TDM导频）。

5. 发明申请

US20060215538A1 Coarse timing/frame acquisition in OFDM system using time division multiplexed pilot symbol 失效
标题翻译：使用时分多路复用导频符号的OFDM系统中的粗定时/帧采集
公开(公告)号：US20060215538A1
公开(公告)日：2006-09-28
申请号：US11371039
申请日：2006-03-08
申请人： Vinay Murthy , Alok Kumar Gupta
发明人： Vinay Murthy , Alok Kumar Gupta
IPC分类号： H04J11/00 , H04J3/06
CPC分类号： H04L27/2656 , H04L27/2675
摘要： Systems and methods are provided for processing Time Domain Multiplexing (TDM) symbols via delayed correlation in the time domain. In one embodiment, a method is provided for determining synchronization information in an Orthogonal Frequency Division Multiplexing (OFDM) broadcast. The method includes employing a time domain correlation to detect the start of an OFDM super frame and utilizing the time domain correlation to synchronize a receiver to the carrier frequency of the OFDM signal.
摘要翻译：提供了系统和方法，用于通过时域中的延迟相关来处理时域多路复用（TDM）符号。在一个实施例中，提供了一种用于在正交频分复用（OFDM）广播中确定同步信息的方法。该方法包括采用时域相关性来检测OFDM超帧的开始，并利用时域相关性使接收机与OFDM信号的载波频率同步。

6. 发明授权

US07756005B2 Coarse timing/frame acquisition of OFDM system using time division multiplexed pilot symbol 失效
标题翻译：使用时分复用导频符号的OFDM系统的粗时序/帧采集
公开(公告)号：US07756005B2
公开(公告)日：2010-07-13
申请号：US11371039
申请日：2006-03-08
申请人： Vinay Murthy , Alok Kumar Gupta
发明人： Vinay Murthy , Alok Kumar Gupta
IPC分类号： H04J11/00
CPC分类号： H04L27/2656 , H04L27/2675
摘要： Systems and methods are provided for processing Time Domain Multiplexing (TDM) symbols via delayed correlation in the time domain. In one embodiment, a method is provided for determining synchronization information in an Orthogonal Frequency Division Multiplexing (OFDM) broadcast. The method includes employing a time domain correlation to detect the start of an OFDM super frame and utilizing the time domain correlation to synchronize a receiver to the carrier frequency of the OFDM signal.
摘要翻译：提供了系统和方法，用于通过时域中的延迟相关来处理时域多路复用（TDM）符号。在一个实施例中，提供了一种用于在正交频分复用（OFDM）广播中确定同步信息的方法。该方法包括采用时域相关性来检测OFDM超帧的开始，并利用时域相关性使接收机与OFDM信号的载波频率同步。

7. 发明授权

US07860193B2 Coarse timing estimation system and methodology for wireless symbols 有权
标题翻译：无线符号的粗定时估计系统和方法
公开(公告)号：US07860193B2
公开(公告)日：2010-12-28
申请号：US11020411
申请日：2004-12-22
申请人： Alok Kumar Gupta
发明人： Alok Kumar Gupta
IPC分类号： H04L27/06
CPC分类号： H04L27/2665 , H04L27/2607 , H04L27/2662
摘要： A system that facilitates obtaining a coarse estimation of a boundary of symbol with respect to time comprises a peak detector that detects a peak energy of an energy distribution output by a correlator, and an estimating component that adaptively estimates a boundary of the symbol based as a function of the detected peak energy. A parameter defined as a function of the magnitude to create a threshold value, the estimate obtained as a function of a comparison of the threshold with the energy distribution.
摘要翻译：有助于获得关于时间的符号边界的粗略估计的系统包括检测由相关器输出的能量分布的峰值能量的峰值检测器，以及估计部件，其自适应地将符号的边界估计为检测到的峰值能量的功能。定义为产生阈值的幅度的函数的参数，作为阈值与能量分布的比较的函数获得的估计。

8. 再颁专利

USRE36692E Heat treatment process for aluminum alloy sheet 失效
标题翻译：铝合金板材热处理工艺
公开(公告)号：USRE36692E
公开(公告)日：2000-05-16
申请号：US113619
申请日：1998-07-10
申请人： Alok Kumar Gupta , Michael J. Wheeler , Michael Jackson Bull , Pierre Henri Marois
发明人： Alok Kumar Gupta , Michael J. Wheeler , Michael Jackson Bull , Pierre Henri Marois
IPC分类号： C22F1/00 , C22C21/02 , C22C21/06 , C22C21/08 , C22C21/14 , C22C21/16 , C22F1/04 , C22F1/043 , C22F1/05 , C22F1/057
CPC分类号： C22F1/043 , C22C21/02 , C22C21/08 , C22C21/14 , C22C21/16 , C22F1/04 , C22F1/05 , C22F1/057
摘要： A process of producing solution heat treated aluminum alloy sheet material comprises subjecting hot- or cold-rolled aluminum alloy sheet to solution heat treatment followed by quenching and, before substantial age hardening has taken place, subjecting the alloy sheet material to one or more subsequent heat treatments involving heating the material to a peak temperature in the range of 100.degree. to 300.degree. C. (preferably 130.degree.-270.degree. C.), holding the material at the peak temperature for a period of time less than about 1 minute, and cooling the alloy from the peak temperature to a temperature of 85.degree. C. or less. The sheet material treated in this way can be used for automotive panels and has good a good "paint bake response", i.e. an increase in yield strength from the T4 temper to the T8X temper upon painting and baking of the panels.
摘要翻译：制备固溶热处理的铝合金板材的方法包括将热轧或冷轧铝合金板材进行固溶热处理，然后淬火，并且在大量时效硬化之前，对合金板材进行一个或多个随后的热处理包括将材料加热到100℃至300℃（优选130℃-270℃）的峰值温度的处理，将材料保持在峰值温度下时间小于约1分钟，以及将合金从峰值温度冷却至85℃以下的温度。以这种方式处理的片材可以用于汽车面板，并且具有良好的“烤漆响应”，即在面漆的涂漆和烘烤时从T4回火到T8X回火的屈服强度的增加。

9. 发明授权

US11673147B2 Air purification system 有权
公开(公告)号：US11673147B2
公开(公告)日：2023-06-13
申请号：US17045198
申请日：2019-03-04
申请人： Praful Ramachandra Naik , Alok Kumar Gupta
发明人： Praful Ramachandra Naik , Alok Kumar Gupta
IPC分类号： B03C3/41 , B03C3/019 , B03C3/36 , B03C3/47 , B03C3/49 , A61L9/22
CPC分类号： B03C3/41 , B03C3/019 , B03C3/368 , B03C3/47 , B03C3/49 , A61L9/22 , A61L2209/14
摘要： The present disclosure envisages an air purification system. The system comprises includes a shell, a blower, an electrode and a plurality of spikes. The shell has electrically-grounded wall(s), an inlet, and an outlet. The blower generates flow of air through the shell. The electrode is fitted within the shell between the inlet and the outlet and is electrically isolated from the shell body. The spikes extend from the electrode. The spikes have tips spaced apart from the inner surfaces of the walls and generate a corona between the tips and the inner surface of the walls when an high voltage electric current is passed through the electrode and thereby ionize gases and charge particles present in the air resulting in the particles being deposited on the inner surface of the walls of the shell.

10. 发明授权

US08768690B2 Coding scheme selection for low-bit-rate applications 有权
标题翻译：低比特率应用的编码方案选择
公开(公告)号：US08768690B2
公开(公告)日：2014-07-01
申请号：US12261750
申请日：2008-10-30
申请人： Alok Kumar Gupta , Ananthapadmanabhan A. Kandhadai
发明人： Alok Kumar Gupta , Ananthapadmanabhan A. Kandhadai
IPC分类号： G10L21/00
CPC分类号： G10L19/22 , G10L19/097 , G10L19/125 , G10L25/90
摘要： Systems, methods, and apparatus for low-bit-rate coding of transitional speech frames are disclosed.
摘要翻译：公开了用于过渡语音帧的低比特率编码的系统，方法和装置。

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