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    • 4. 发明申请
    • HIERARCHICAL MODULATION FOR ACCURATE CHANNEL SOUNDING
    • 精确通道声音的分层调制
    • WO2011004235A1
    • 2011-01-13
    • PCT/IB2010/001611
    • 2010-07-01
    • KEERTHI, Arvind, Vijay
    • KEERTHI, Arvind, Vijay
    • H04L27/00H04B7/00
    • H04L5/0023H04L25/0224H04L25/0232H04L27/3488
    • Method and apparatus for improving the channel estimate of a communication channel between a first station and a second station, while reducing the amount of reserved bandwidth for pilot tones. Hierarchical modulation is used to augment pilot density without sacrificing throughput. At the first station, a digital information stream may be split into a base stream and an enhancement stream, wherein the base stream and the enhancement stream combined form a hierarchical signal. At the second station, the base stream may be first recovered, and recovered base stream serves as a pilot for the enhancement stream. Thus the base stream, which is a subset of the total transmitted information, may be made to perform the channel-sounding function for the enhancement stream.
    • 一种用于改善第一站和第二站之间的通信信道的信道估计的方法和装置,同时减少用于导频音调的预留带宽量。 层次调制用于增加导频密度,而不会牺牲吞吐量。 在第一站处,数字信息流可以被分成基本流和增强流,其中基本流和增强流组合形成分级信号。 在第二站,可以首先恢复基本流,并且恢复的基本流用作增强流的导频。 因此,可以使作为总传输信息的子集的基本流执行用于增强流的信道探测功能。
    • 6. 发明申请
    • CHANNEL ESTIMATION FOR A COMMUNICATION SYSTEM USING SPECTRAL ESTIMATION
    • 使用光谱估计的通信系统的信道估计
    • WO2005074218A1
    • 2005-08-11
    • PCT/US2005/003006
    • 2005-01-26
    • QUALCOMM INCORPORATEDKEERTHI, Arvind, Vijay
    • KEERTHI, Arvind, Vijay
    • H04L25/02
    • H04L25/0248H04L25/0224H04L27/2647
    • Techniques for performing channel estimation in a multi-carrier system are described. A frequency response estimate is initially obtained for a wireless channel based on a narrowband pilot sent on different sets of subbands in different symbol periods or a wideband pilot sent on all or most subbands in the system. Spectral estimation is performed on the frequency response estimate to determine at least one frequency component of the frequency channel estimate, with each frequency component being indicative of a delay for a channel tap in an impulse response estimate for the wireless channel. A channel estimate for the wireless channel is then obtained based on the frequency component(s) determined by the spectral estimation. This channel estimate may be a channel profile, the impulse response estimate, an improved frequency response estimate, a signal arrival time, or some other pertinent information regarding the wireless channel.
    • 描述用于在多载波系统中执行信道估计的技术。 基于在不同符号周期的不同子带集合上发送的窄带导频或在系统中的所有或大多数子带上发送的宽带导频,最初获得针对无线信道的频率响应估计。 对频率响应估计执行频谱估计以确定频道估计的至少一个频率分量,其中每个频率分量指示无线信道的脉冲响应估计中的信道抽头的延迟。 然后基于由频谱估计确定的频率分量来获得无线信道的信道估计。 该信道估计可以是关于无线信道的信道简档,脉冲响应估计,改进的频率响应估计,信号到达时间或一些其他相关信息。
    • 7. 发明申请
    • PREDICTIVE SPECTRAL ALLOCATION IN MOBILE NETWORKS
    • 移动网络中的预测频谱分配
    • WO2014158205A1
    • 2014-10-02
    • PCT/US2013/047380
    • 2013-06-24
    • EMPIRE TECHNOLOGY DEVELOPMENT, LLC
    • KEERTHI, Arvind, Vijay
    • H04W72/04
    • H04W72/048H04B17/373H04L5/0007H04L5/006H04W72/042H04W72/044H04W72/0446H04W72/0453
    • Technologies are generally described for discerning patterns in the "goodness" or "badness" of time-frequency slots to allow predictive allocation of spectral resources that may be appropriate for a wireless user. According to some examples, information on device location, time slots, sub-carrier(s) allotted for each time slot, and quality indicators may be received from mobile devices. The time slots may be grouped by location to form analysis intervals. A time-frequency vector may then be identified for each analysis interval and a unit of geographic grid. A "goodness" indicator may be computed for each time-frequency vector. Clusters of time-frequency vectors may be categorized for each analysis interval and associated unit of geographic grid such that mobile devices can be assigned "good" clusters through sub-carrier allocation.
    • 通常描述技术用于在时间 - 频率时隙的“良好”或“不良”中识别模式,以允许可能适合于无线用户的频谱资源的预测分配。 根据一些示例,可以从移动设备接收关于每个时隙分配的设备位置,时隙,子载波的信息以及质量指示符。 时隙可以按位置分组以形成分析间隔。 然后可以针对每个分析间隔和地理网格的单位来识别时间 - 频率向量。 可以为每个时间 - 频率矢量计算“良好”指标。 可以针对每个分析间隔和相关联的地理网格单位对时间 - 频率向量的群进行分类,使得移动设备可以通过子载波分配被分配为“良好的”群集。
    • 9. 发明申请
    • SMOOTH TRANSITION BETWEEN PREDICTIVE AND MOBILE-ASSISTED SPECTRAL ALLOCATION
    • 预测和移动辅助频谱分配之间的平滑过渡
    • WO2014200512A1
    • 2014-12-18
    • PCT/US2013/053103
    • 2013-07-31
    • EMPIRE TECHNOLOGY DEVELOPMENT, LLC
    • KEERTHI, Arvind, Vijay
    • H04L12/26H04Q7/20H04W24/00H04W24/02H04W24/04H04W28/02
    • H04W24/08H04L5/0046H04L5/0057H04L5/006
    • Technologies are generally described for providing a transition between predictive and mobile-assisted spectral allocation. In some examples, wireless devices may be enabled to determine adequacy of their allocated spectral path to meet their communication needs by analyzing signal-to-noise ratios (SNRs) of their assigned sub-carriers. If a wireless device determines a current sub-carrier to be inadequate based on the analysis, it may send information associated with preferred sub-carriers to a base station. The base station may determine one or more nearby good clusters based on a comparison of a sequence of received preferred sub- carriers and the spectral paths represented by the nearby cluster centers, and select a re-allocated spectral path with shortest information distance to the sequence of preferred sub-carriers.
    • 通常描述技术来提供预测和移动辅助频谱分配之间的转换。 在一些示例中,无线设备可以通过分析其分配的子载波的信噪比(SNR)来确定其分配的频谱路径的充分性以满足其通信需求。 如果无线设备基于分析确定当前子载波不足,则它可以向基站发送与优选子载波相关联的信息。 基站可以基于接收到的优选子载波的序列和由附近的聚类中心表示的频谱路径的比较来确定一个或多个附近的优选聚类,并且选择具有到该序列的最短信息距离的重新分配的光谱路径 的优选子载体。