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1.发明授权Automatic frequency control for a wireless communication system with multiple subcarriers 有权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
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。
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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。
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3.发明申请Automatic frequency control for a wireless communication system with multiple subcarriers 有权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：US20060215778A1
公开(公告)日：2006-09-28
申请号：US11372931
申请日：2006-03-09
申请人： Vinay Murthy , Alok Gupta , Seong Taek Chung , Fuyun Ling
发明人： Vinay Murthy , Alok Gupta , Seong Taek Chung , Fuyun Ling
IPC分类号： H04K1/10
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，选择接收到的OFDM符号的可变数目的样本，以用于频率误差估计。
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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。
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5.发明申请SYNCHRONIZATION IN A BROADCAST OFDM SYSTEM USING TIME DIVISION MULTIPLEXED PILOTS 审中-公开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
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）。
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公开(公告)号：US20100220816A1
公开(公告)日：2010-09-02
申请号：US12777540
申请日：2010-05-11
IPC分类号： H04L27/00
CPC分类号： H04L27/3488 , H04W52/0245 , Y02D70/00
摘要： A wireless communication apparatus in a hierarchically coded modulation system can use error control mechanisms generated during decoding of base layer information to predict a probability of successful demodulation of enhancement layer information. Performance in the demodulation of the base layer correlates to performance in the demodulation of the enhancement layer. The receiver can determine whether to attempt demodulation of temporally correlated enhancement layer data based in part on the predicted probability of success. If the receiver determines not to demodulate the enhancement layer, the receiver can power down the enhancement layer demodulator, or otherwise minimize the power expended in the enhancement layer demodulator.
摘要翻译： 分级编码调制系统中的无线通信装置可以使用在解码基层信息期间产生的误差控制机制来预测增强层信息的成功解调的概率。 基层解调性能与增强层解调性能有关。 接收机可以部分地基于预测的成功概率来确定是否尝试对时间相关的增强层数据的解调。 如果接收机确定不解调增强层，则接收机可以将增强层解调器断电，或以其他方式最小化增强层解调器中消耗的功率。
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公开(公告)号：US08874998B2
公开(公告)日：2014-10-28
申请号：US12467303
申请日：2009-05-17
CPC分类号： H04L27/3488 , H04W52/0245 , Y02D70/00
摘要： A wireless communication apparatus in a hierarchically coded modulation system can use error control mechanisms generated during decoding of base layer information to predict a probability of successful demodulation of enhancement layer information. Performance in the demodulation of the base layer correlates to performance in the demodulation of the enhancement layer. The receiver can determine whether to attempt demodulation of temporally correlated enhancement layer data based in part on the predicted probability of success. If the receiver determines not to demodulate the enhancement layer, the receiver can power down the enhancement layer demodulator, or otherwise minimize the power expended in the enhancement layer demodulator.
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公开(公告)号：US08428198B2
公开(公告)日：2013-04-23
申请号：US11376986
申请日：2006-03-15
IPC分类号： H04L27/06
CPC分类号： H04L27/2657 , H04L27/2607 , H04L27/2665 , H04L27/2678 , H04L27/2695
摘要： A frequency tracking method and apparatus is provided. A receiver receives OFDM symbols and determines associated frequency offset. A frequency error estimator selects a cross correlation window for determining frequency offset based on timing offset. A symbol timing estimator is used to determine the timing offset.
摘要翻译： 提供了一种频率跟踪方法和装置。 接收机接收OFDM符号并确定相关的频率偏移。 频率误差估计器基于定时偏移来选择用于确定频率偏移的互相关窗口。 使用符号定时估计器来确定定时偏移。
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公开(公告)号：US08737470B2
公开(公告)日：2014-05-27
申请号：US12777540
申请日：2010-05-11
CPC分类号： H04L27/3488 , H04W52/0245 , Y02D70/00
摘要： A wireless communication apparatus in a hierarchically coded modulation system can use error control mechanisms generated during decoding of base layer information to predict a probability of successful demodulation of enhancement layer information. Performance in the demodulation of the base layer correlates to performance in the demodulation of the enhancement layer. The receiver can determine whether to attempt demodulation of temporally correlated enhancement layer data based in part on the predicted probability of success. If the receiver determines not to demodulate the enhancement layer, the receiver can power down the enhancement layer demodulator, or otherwise minimize the power expended in the enhancement layer demodulator.
摘要翻译： 分级编码调制系统中的无线通信装置可以使用在解码基层信息期间产生的误差控制机制来预测增强层信息的成功解调的概率。 基层解调性能与增强层解调性能有关。 接收机可以部分地基于预测的成功概率来确定是否尝试对时间相关的增强层数据的解调。 如果接收机确定不解调增强层，则接收机可以将增强层解调器断电，或以其他方式最小化增强层解调器中消耗的功率。
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公开(公告)号：US07725799B2
公开(公告)日：2010-05-25
申请号：US11096320
申请日：2005-03-31
CPC分类号： H04L27/3488 , H04W52/0245 , Y02D70/00
摘要： A wireless communication apparatus in a hierarchically coded modulation system can use error control mechanisms generated during decoding of base layer information to predict a probability of successful demodulation of enhancement layer information. Performance in the demodulation of the base layer correlates to performance in the demodulation of the enhancement layer. The receiver can determine whether to attempt demodulation of temporally correlated enhancement layer data based in part on the predicted probability of success. If the receiver determines not to demodulate the enhancement layer, the receiver can power down the enhancement layer demodulator, or otherwise minimize the power expended in the enhancement layer demodulator.
摘要翻译： 分级编码调制系统中的无线通信装置可以使用在解码基层信息期间产生的误差控制机制来预测增强层信息的成功解调的概率。 基层解调性能与增强层解调性能有关。 接收机可以部分地基于预测的成功概率来确定是否尝试对时间相关的增强层数据的解调。 如果接收机确定不解调增强层，则接收机可以将增强层解调器断电，或以其他方式最小化增强层解调器中消耗的功率。
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