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    61.
    发明专利
    未知

    公开(公告)号：AT456235T

    公开(公告)日：2010-02-15

    申请号：AT06751671

    申请日：2006-04-26

    Applicant: QUALCOMM INC

    Inventor： JAYARAMAN SRIKANT ,  XU HAO ,  NAMGOONG JUNE ,  MANGAN MICHAEL ,  BLACK PETER

    IPC: H04L27/26 ,  H04L1/20 ,  H04L5/00

    Abstract: A spread-spectrum communication system provides an effective signal-to-noise ratio (SNR) of received orthogonal frequency division multiplex (OFDM) slots in the presence of timing errors. Effective SNR can serve as a diagnostic tool for determining whether there was a timing error when a measured packet error rate (PER) remains high, and a predicted PER from the effective SNR remains low. A loop can use the effective SNR to control a time reference used by an OFDM decoder.

    NOISE VARIANCE ESTIMATION IN WIRELESS COMMUNICATIONS FOR DIVERSITY COMBINING AND LOG-LIKELIHOOD SCALING
    62.
    发明专利
    NOISE VARIANCE ESTIMATION IN WIRELESS COMMUNICATIONS FOR DIVERSITY COMBINING AND LOG-LIKELIHOOD SCALING 未知

    公开(公告)号：SG155910A1

    公开(公告)日：2009-10-29

    申请号：SG2009060583

    申请日：2005-09-16

    Applicant: QUALCOMM INC

    Inventor： NAMGOONG JUNE ,  XU HAO ,  BLACK PETER J ,  JAYARAMAN SRIKANT

    Abstract: Noise variance estimation in wireless communications. Noise variance estimation includes receiving a signal 402 including an OFDM symbol having, in-band tones including in-band pilot tones, and band-edge tones including band-edge pilot tones and guard tones, estimating an effective noise variance for the in-band tones 702 using the in-band pilot tones and channel estimates for the in-band pilot tones, and estimating an effective noise variance for the band-edge tones 704 using the band-edge pilot tones, channel estimates for the band-edge pilot tones, and the guard tones.

    63.
    发明专利
    未知

    公开(公告)号：BRPI0512050A

    公开(公告)日：2008-02-06

    申请号：BRPI0512050

    申请日：2005-06-14

    Applicant: QUALCOMM INC

    Inventor： BLACK PETER J ,  XU HAO ,  NAMGOONG JUNE ,  JAYARAMAN SRIKANT

    IPC: H04L25/02

    Abstract: A pilot assisted channel estimation process. A receiver may be configured to estimate the impulse response of a channel from a signal having pilot tones and spread-spectrum pilot signals. The receiver estimates the response of the channel from the pilot tones, and adapts the length of delay the channel response is estimated based on the spread-spectrum pilot signals.

    : ML DECODING OF CODEWORDS WITH PARTIAL CHANNEL INFORMATION IN A GEO SATELLITE REVERSE LINK
    67.
    发明申请
    : ML DECODING OF CODEWORDS WITH PARTIAL CHANNEL INFORMATION IN A GEO SATELLITE REVERSE LINK 审中-公开
    ：在地球环境卫星反向链路中解码部分信道的编码

    公开(公告)号：WO2008130443A3

    公开(公告)日：2009-05-14

    申请号：PCT/US2007083242

    申请日：2007-10-31

    Applicant: QUALCOMM INC ,  JAYARAMAN SRIKANT ,  NAMGOONG JUNE

    Inventor： JAYARAMAN SRIKANT ,  NAMGOONG JUNE

    IPC: H04L25/02 ,  H04J11/00

    CPC classification number: H04L25/0214 ,  H04B1/7075 ,  H04B2201/70701 ,  H04L25/0236

    Abstract: A power efficient technique is used to demodulate the coded overhead channels of a GEO satellite uplink. A coherent receiver used in a wireless communication system is able to determine the information conveyed in the overhead channel, by effecting channel estimates from codewords extracted from a pilot signal. A valid set of codewords is established (111). Pilot symbols are extracted from a pilot signal (114) and a channel estimate is made from the pilot signal (115). Codewords in the set of valid codewords are correlated (112) and the channel estimate is used to form a set of metries (123) and the codeword corresponding to the maximum metric is selected (135).

    Abstract translation: 使用功率有效的技术来解调GEO卫星上行链路的编码开销信道。 在无线通信系统中使用的相干接收机能够通过从从导频信号提取的码字实现信道估计来确定在开销信道中传送的信息。 建立一组有效的码字（111）。 从导频信号（114）提取导频符号，并且从导频信号（115）进行信道估计。 所述有效码字集合中的码字被相关（112），并且信道估计被用于形成一组信元（123），并且选择与最大度量对应的码字（135）。

    ULTRA-WIDEBAND RANGING WAVEFORM
    69.
    发明申请
    ULTRA-WIDEBAND RANGING WAVEFORM 审中-公开
    超宽带范围波形

    公开(公告)号：WO2014200747A3

    公开(公告)日：2015-02-12

    申请号：PCT/US2014040478

    申请日：2014-06-02

    Applicant: QUALCOMM INC

    Inventor： NAMGOONG JUNE ,  JAYARAMAN SRIKANT

    IPC: G01S5/02

    CPC classification number: G01S3/04 ,  G01S5/0226

    Abstract: Methods, systems, devices, and apparatuses are described for location tracking in which each tag used to track an asset or person in an indoor environment transmits ranging waveforms used to estimate a location of the tag. Multiple tags may concurrently transmit without interfering with each other by having each tag use a distinct frequency shift for the ranging waveforms. Access points may be deployed throughout the indoor environment as part of a wireless network (e.g., ultra-wideband or UWB network) that tracks the assets. The access points may receive the ranging waveforms transmitted by the tags and may perform measurements based on the ranging waveforms. The measurements may be sent to a tracking management server to estimate the location of the tags. The server may also determine and assign the distinct frequency shifts used by the tags and may modify the assignment when the number of tags being tracked changes.

    Abstract translation: 描述用于位置跟踪的方法，系统，设备和装置，其中用于跟踪室内环境中的资产或人员的每个标签传输用于估计标签位置的测距波形。 通过使每个标签对测距波形使用不同的频移，多个标签可以同时发送而不干扰彼此。 接入点可以在整个室内环境中部署，作为跟踪资产的无线网络（例如，超宽带或UWB网络）的一部分。 接入点可以接收由标签发送的测距波形，并且可以基于测距波形执行测量。 测量可以发送到跟踪管理服务器以估计标签的位置。 服务器还可以确定并分配标签使用的不同频率偏移，并且当跟踪的标签的数量改变时可以修改分配。

    IMPROVEMENTS TO A WIRELESS INTERFACE TO ENABLE COMMUNICATIONS VIA A SATELLITE RELAY
    70.
    发明申请
    IMPROVEMENTS TO A WIRELESS INTERFACE TO ENABLE COMMUNICATIONS VIA A SATELLITE RELAY 审中-公开
    改善无线接口，通过卫星接收器实现通信

    公开(公告)号：WO2008014520A3

    公开(公告)日：2008-03-20

    申请号：PCT/US2007074767

    申请日：2007-07-30

    Applicant: QUALCOMM INC ,  KUPPUSWAMY KALYAN ,  NAMGOONG JUNE ,  JAYARAMAN SRIKANT ,  JALALI AHMAD

    Inventor： KUPPUSWAMY KALYAN ,  NAMGOONG JUNE ,  JAYARAMAN SRIKANT ,  JALALI AHMAD

    IPC: H04L29/06 ,  H04B7/185

    CPC classification number: H04B7/18567

    Abstract: A communication system is provided that allows a mobile terminal with an EVDO interface to perform VoIP communications via a satellite. The 1xEVDO physical layer frames and vocoder frames are synchronized and aligned to a known periodic time boundary for efficient transmission. A reverse link transmission rate is adjusted to match a VoIP packet source rate and operate the reverse link transmission channel to a satellite continuously. The reverse link transmission channel from a mobile terminal to a satellite may operate continuously and at a lower channel transmission rate to reduce the peak power amplifier power requirement. The higher layer time-out periods are increased to account for propagation delay to/from a satellite relay. A physical layer retransmit mechanism is disabled to ignore ACKs/ NACKs when sending VoIP packets via a satellite relay. A different channel code may be selective applied depending on the size/type of packets being transmitted.

    Abstract translation: 提供一种通信系统，其允许具有EVDO接口的移动终端经由卫星执行VoIP通信。 1xEVDO物理层帧和声码器帧被同步并对齐到已知的周期时间边界以进行有效传输。 调整反向链路传输速率以匹配VoIP分组源速率并且连续地向卫星操作反向链路传输信道。 从移动终端到卫星的反向链路传输信道可以连续地以较低的信道传输速率工作，以降低峰值功率放大器的功率需求。 更高层的超时周期被增加以考虑到/从卫星中继的传播延迟。 当通过卫星中继发送VoIP分组时，物理层重传机制被禁止忽略ACK / NACK。 根据发送的分组的大小/类型，可以选择性地应用不同的信道码。

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