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    UN METODO DE RASTREAR ERROR DE FRECUENCIA EN UN SISTEMA DE COMUNICACION DE MLTIPLEXION POR DIVISION DE FRECUENCIA ORTOGONAL, UN APARATO EN UN SISTEMA DE COMUNICACION Y UN ARTICULO DE FABRICACION
    31.
    发明专利
    UN METODO DE RASTREAR ERROR DE FRECUENCIA EN UN SISTEMA DE COMUNICACION DE MLTIPLEXION POR DIVISION DE FRECUENCIA ORTOGONAL, UN APARATO EN UN SISTEMA DE COMUNICACION Y UN ARTICULO DE FABRICACION 未知

    公开(公告)号：AR043844A1

    公开(公告)日：2005-08-17

    申请号：ARP040101206

    申请日：2004-04-07

    Applicant: QUALCOMM INC

    Inventor： GUPTA ALOK KUMAR

    IPC: H04L27/26 ,  H04L27/28

    Abstract: Se proporcionan técnicas para rastrear error residual de frecuencia y ruido de fase en un sistema OFDM. En un receptor, cada símbolo OFDM recibido es transformado con un FFT para obtener símbolos de modulación recibidos, los cuales están seriados. Un circuito de fase trabada (PLL) opera sobre los símbolos seriados de modulación recibidos y provee un valor independiente de corrección de fase para cada símbolo de modulación recibido. Cada símbolo de modulación recibido es corregida por su propio valor de corrección de fase para obtener un símbolo de fase corregido. Se detecta el error de fase en cada símbolo de fase corregido para obtener un estimativo de error de fase para ese símbolo de fase corregido. Se filtra el estimativo de error de fase para cada símbolo de fase corregido (por ejemplo, con un filtro de circuito de segundo orden) para obtener un estimativo de error de frecuencia, el cual se acumula para obtener un valor de corrección de fase para otro símbolo de modulación recibido. Los símbolos de fase corregida no están correlacionados debido a que valores independientes de corrección de fase son utilizados por los símbolos de modulación recibidos

    FRAME SYNCHRONIZATION AND INITIAL SYMBOL TIMING ACQUISITION SYSTEM AND METHOD
    32.
    发明专利
    FRAME SYNCHRONIZATION AND INITIAL SYMBOL TIMING ACQUISITION SYSTEM AND METHOD 未知

    公开(公告)号：CA2554603A1

    公开(公告)日：2005-08-11

    申请号：CA2554603

    申请日：2005-01-28

    Applicant: QUALCOMM INC

    Inventor： GUPTA ALOK KUMAR

    IPC: H04L27/26

    Abstract: A robust initial frame detection and symbol synchronization system and methodology are provided. In particular, a first pilot is employed in conjunction with three acquisition stages. In the first stage, an attempt is made to observe the leading edge of the correlation curve associated with th e first pilot symbol. In the second stage, a determination is made as to wheth er a leading edge was detected in the first stage by attempting to observe a fl at portion and/or trailing edge of the correlation curve. Furthermore, during this second stage, a frequency loop can be updated to account for frequency offset. The third stage is for observing the trailing edge of the curve if i t was not already observed in stage two. Upon detection and confirmation of receipt of the first pilot, a second pilot can subsequently be employed to acquire fine symbol timing.

    DETERMINING COORDINATES OF ACCESS POINTS IN AN INDOOR POSITION LOCATION SYSTEM
    34.
    发明申请
    DETERMINING COORDINATES OF ACCESS POINTS IN AN INDOOR POSITION LOCATION SYSTEM 审中-公开
    确定室内位置系统中的接入点坐标

    公开(公告)号：WO2015047937A2

    公开(公告)日：2015-04-02

    申请号：PCT/US2014056748

    申请日：2014-09-22

    Applicant: QUALCOMM INC

    Inventor： GUPTA ALOK KUMAR

    CPC classification number: H04W4/04 ,  G01S5/00 ,  G01S5/0242 ,  G01S5/0289 ,  H04W64/00 ,  H04W64/003

    Abstract: Methods, systems, and devices are described for determining and updating coordinates of access points (APs) within a location tracking system. Tools and techniques are described that may provide for automatically determining a coordinate set, which represents coordinates of at least three neighboring APs within a location tracking area. These techniques may be utilized at the time of the APs' deployment and/or when APs are moved or relocated to a new location. The methods, systems, and devices may be applicable to single- and multi-floor location tracking systems. Coordinate and/or coordinate sets of APs may be stored in a location tracking server, and they may used in determining a location of tracking tags with the location tracking area. The stored coordinates and/or coordinate sets may be updated as the location of APs change.

    Abstract translation: 描述了用于确定和更新位置跟踪系统内的接入点（AP）的坐标的方法，系统和设备。 描述了可以提供自动确定表示位置跟踪区域内的至少三个相邻AP的坐标的坐标集的工具和技术。 这些技术可以在AP的部署时和/或当AP被移动或重定位到新的位置时使用。 方法，系统和设备可能适用于单层和多层位置跟踪系统。 AP的坐标和/或坐标集可以存储在位置跟踪服务器中，并且它们可以用于确定具有位置跟踪区域的跟踪标签的位置。 存储的坐标和/或坐标集可以随着AP的位置而改变。

    POWER EFFICIENT AND FLEXIBLE UPDATE RATE POSITIONING SYSTEM
    36.
    发明申请
    POWER EFFICIENT AND FLEXIBLE UPDATE RATE POSITIONING SYSTEM 审中-公开
    功率有效和灵活的更新速率定位系统

    公开(公告)号：WO2015047772A3

    公开(公告)日：2015-06-04

    申请号：PCT/US2014055653

    申请日：2014-09-15

    Applicant: QUALCOMM INC

    Inventor： GUPTA ALOK KUMAR ,  CHILUKURI SRINIVAS ,  KING SCOTT HOWARD

    IPC: H04W64/00

    CPC classification number: G06K7/10366 ,  G06K7/10207 ,  G06K7/10306 ,  H04W4/028 ,  H04W52/0254 ,  H04W64/00 ,  H04W76/048 ,  Y02B60/50 ,  Y02D70/00 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/162

    Abstract: Methods, systems, and devices for automatically changing the manner in which a tag unit communicates with one or more access points based on the tag unit's mobility state are described. A tag unit may transmit ultra-wideband (UWB) signals in a low update mode while in a stationary state. The tag unit may transmit UWB signals in a high update mode while in a mobile state. The tag unit, an access point, and/or a tracking management server may determine a tag unit's mobility state and adjust an update mode based on the mobility state.

    Abstract translation: 描述用于基于标签单元的移动性状态自动改变标签单元与一个或多个接入点通信的方式，系统和设备。 标签单元可以在处于静止状态的低更新模式下传输超宽带（UWB）信号。 标签单元可以在移动状态下以高更新模式发送UWB信号。 标签单元，接入点和/或跟踪管理服务器可以确定标签单元的移动性状态，并且基于移动性状态来调整更新模式。

    OPTIMAL TIMING AND FREQUENCY ACQUISITION FOR OFDM SYSTEMS
    37.
    发明申请
    OPTIMAL TIMING AND FREQUENCY ACQUISITION FOR OFDM SYSTEMS 审中-公开
    OFDM系统的最佳时序和频率采集

    公开(公告)号：WO2006105177A2

    公开(公告)日：2006-10-05

    申请号：PCT/US2006011434

    申请日：2006-03-28

    Applicant: QUALCOMM INC ,  WANG MICHAEL MAO ,  GUPTA ALOK KUMAR

    Inventor： WANG MICHAEL MAO ,  GUPTA ALOK KUMAR

    IPC: H04L7/04 ,  H04L27/26

    CPC classification number: H04L27/2656 ,  H04L27/261 ,  H04L27/2657 ,  H04L27/2675

    Abstract: Systems and methods are provided for processing Time Domain Multiplexing Pilot symbols by employing matched filtering components to process delayed correlator outputs as opposed to applying a fixed threshold directly to the delayed correlator outputs. In an embodiment, a method for timing acquisition in a wireless network is provided. The method includes filtering a correlation output of a TDM pilot via an edge template and employing the correlation output to determine timing or frequency in a wireless network.

    Abstract translation: 提供了系统和方法，用于通过采用匹配的滤波分量来处理延迟的相关器输出来处理时域多路复用导频符号，而不是将直接将固定阈值应用于延迟的相关器输出。 在一个实施例中，提供了一种用于无线网络中的定时获取的方法。 该方法包括通过边缘模板对TDM导频的相关输出进行滤波，并采用相关输出来确定无线网络中的定时或频率。

    SYNCHRONIZATION IN A BROADCAST OFDM SYSTEM USING TIME DIVISION MULTIPLEXED PILOTS
    39.
    发明申请
    SYNCHRONIZATION IN A BROADCAST OFDM SYSTEM USING TIME DIVISION MULTIPLEXED PILOTS 审中-公开
    利用时分复用导频在广播OFDM系统中同步

    公开(公告)号：WO2009059250A2

    公开(公告)日：2009-05-07

    申请号：PCT/US2008082155

    申请日：2008-10-31

    Applicant: QUALCOMM INC ,  LING FUYUN ,  GUPTA ALOK KUMAR ,  KRISHNAMOORTHI RAGHURAMAN ,  CHARI MURALI RAMASWAMY ,  VIJAYAN RAJIV ,  VRCELJ BOJAN

    Inventor： LING FUYUN ,  GUPTA ALOK KUMAR ,  KRISHNAMOORTHI RAGHURAMAN ,  CHARI MURALI RAMASWAMY ,  VIJAYAN RAJIV ,  VRCELJ BOJAN

    IPC: H04L5/02 ,  H04L27/26

    CPC classification number: H04L27/2662 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/2613 ,  H04L27/2656

    Abstract: 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 Si identical pilot- 1 sequences of length Li 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).

    Abstract translation: 在OFDM系统中，发射机在第一组子带上广播第一TDM导频，然后在每帧中的第二组子带上广播第二TDM导频。 （1）用于第一TDM导频的OFDM符号至少包含长度为Li的Si个相同的导频-1序列，以及（2）用于第二TDM导频的OFDM符号包含在每个子集中的子带 至少S2个相同的长度为L2的导频-2序列，其中L2> L1，S1 L1 = N，并且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 来自第二个TDM试点）。

    PHASE LOCKED LOOP FOR AN OFDM SYSTEM
    40.
    发明申请
    PHASE LOCKED LOOP FOR AN OFDM SYSTEM 审中-公开
    OFDM系统的锁相环

    公开(公告)号：WO2004093363A3

    公开(公告)日：2006-04-13

    申请号：PCT/US2004010575

    申请日：2004-04-06

    Applicant: QUALCOMM INC ,  GUPTA ALOK KUMAR

    Inventor： GUPTA ALOK KUMAR

    IPC: H04L27/26 ,  H03D3/24

    CPC classification number: H04L27/2695 ,  H04L27/266

    Abstract: Techniques are provided for tracking residual frequency error and phase noise in an OFDM system (100). At a receiver (154), each received OFDM symbol is transformed with an FFT (220) to obtain received modulation symbols, which are serialized. A phase locked loop (PLL) (260) operates on the serialized received modulation symbols (230) and provides an independent phase correction value for each received modulation symbol. Each received modulation symbol is corrected with its own phase correction value to obtain a phase-corrected symbol. The phase error in each phase-corrected symbol is detected to obtain a phase error estimate for that phase-corrected symbol. The phase error estimate (250) for each phase-corrected symbol is filtered (e.g., with a second-order loop filter) to obtain a frequency error estimate, which is accumulated to obtain a phase correction value for another received modulation symbol.

    Abstract translation: 提供了用于跟踪OFDM系统中的残余频率误差和相位噪声的技术（100）。 在接收机（154）处，用FFT（220）对每个接收的OFDM符号进行变换以获得被序列化的接收的调制符号。 锁相环（PLL）（260）对串行接收的调制符号（230）进行操作，并为每个接收到的调制符号提供独立的相位校正值。 每个接收到的调制符号用其自己的相位校正值进行校正以获得相位校正符号。 检测每个相位校正符号中的相位误差，以获得该相位校正符号的相位误差估计。 对每个相位校正符号的相位误差估计（250）（例如，用二阶环路滤波器）进行滤波以获得频率误差估计，其被累积以获得另一个接收的调制符号的相位校正值。

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