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7 条记录 (耗时 0.017 秒)

    TX/RX imbalance and carrier leakage calibration
    1.
    发明授权
    TX/RX imbalance and carrier leakage calibration 有权

    公开(公告)号：US10116485B1

    公开(公告)日：2018-10-30

    申请号：US15799360

    申请日：2017-10-31

    申请人： QUALCOMM Incorporated

    发明人： Tienyow Liu ,  James Gardner ,  Jayanand Asok Kumar

    IPC分类号： H04L27/36 ,  H04B1/40 ,  H04L27/38 ,  H04L27/00

    摘要： This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for contemporaneously estimating transmitter in-phase and quadrature (I/Q) imbalances, receiver I/Q imbalances, and transmit carrier leakage in a wireless transceiver. In some implementations, first, second, and third frequency-domain multi-tone (FDMT) signals transmitted through a calibration path of the wireless transceiver are captured to generate frequency domain representations of the first, second, and third FDMT signals. The frequency domain representations of the first, second, and third FDMT signals may be used to contemporaneously estimate the transmitter I/Q imbalances, receiver I/Q imbalances, and the transmit carrier leakage, which in turn may be used to determine transmitter and receiver I/Q imbalance correction filter coefficients and a transmit carrier leakage correction factor.

    Delay spread estimation and utilization
    2.
    发明授权
    Delay spread estimation and utilization 有权

    公开(公告)号：US10524161B2

    公开(公告)日：2019-12-31

    申请号：US14464019

    申请日：2014-08-20

    申请人： QUALCOMM Incorporated

    发明人： Sandip HomChaudhuri ,  Alireza Raissinia ,  James Gardner ,  Sumeet Kumar ,  Vincent Knowles Jones, IV

    IPC分类号： H04W28/04 ,  H04W24/02 ,  H04W28/02

    摘要： Methods, systems, and devices are described for wireless communication at a wireless communication device. A wireless communication device may receive a data frame and use it to estimate a residual channel length (RCL). The device may then modify a finite impulse response (FIR) filter based on the estimated RCL. For example, the device may add additional taps to the FIR filter. The device may continue to adjust the FIR filter until the RCL is at or near zero. In some cases, the wireless communication device may send an indication to the transmitting device to adjust an FIR filter based on the estimated RCL. In some cases, the length of a guard interval may also be adjusted based on the estimated RCL.

    DELAY SPREAD ESTIMATION AND UTILIZATION
    4.
    发明申请
    DELAY SPREAD ESTIMATION AND UTILIZATION 审中-公开
    延迟传播估计和利用

    公开(公告)号：US20160057656A1

    公开(公告)日：2016-02-25

    申请号：US14464019

    申请日：2014-08-20

    申请人： QUALCOMM Incorporated

    发明人： Sandip HomChaudhuri ,  Alireza Raissinia ,  James Gardner ,  Sumeet Kumar ,  Vincent Knowles Jones, IV

    IPC分类号： H04W28/04 ,  H04W24/02 ,  H04W28/02

    摘要： Methods, systems, and devices are described for wireless communication at a wireless communication device. A wireless communication device may receive a data frame and use it to estimate a residual channel length (RCL). The device may then modify a finite impulse response (FIR) filter based on the estimated RCL. For example, the device may add additional taps to the FIR filter. The device may continue to adjust the FIR filter until the RCL is at or near zero. In some cases, the wireless communication device may send an indication to the transmitting device to adjust an FIR filter based on the estimated RCL. In some cases, the length of a guard interval may also be adjusted based on the estimated RCL.

    摘要翻译： 描述了在无线通信设备处的无线通信的方法，系统和设备。 无线通信设备可以接收数据帧并使用它来估计残余信道长度（RCL）。 然后，设备可以基于估计的RCL来修改有限脉冲响应（FIR）滤波器。 例如，设备可以向FIR滤波器添加附加抽头。 该设备可以继续调整FIR滤波器，直到RCL处于或接近零。 在一些情况下，无线通信设备可以向发送设备发送指示，以基于估计的RCL调整FIR滤波器。 在一些情况下，保护间隔的长度也可以基于估计的RCL进行调整。

    Adaptive detection threshold for contention-based channel access
    5.
    发明授权
    Adaptive detection threshold for contention-based channel access 有权

    公开(公告)号：US11357047B2

    公开(公告)日：2022-06-07

    申请号：US15931360

    申请日：2020-05-13

    申请人： QUALCOMM Incorporated

    发明人： Mani Bharathi Pandian ,  Sandip Homchaudhuri ,  James Gardner ,  Vincent Knowles Jones, IV

    IPC分类号： H04W74/08 ,  H04W72/08 ,  H04W24/02 ,  H04W28/06 ,  H04L1/00 ,  H04L12/64

    摘要： This disclosure provides systems, methods and apparatuses for wireless communications. In some implementations, a first wireless communication device associated with a basic service set (BSS) receives a plurality of packets transmitted during a measurement window by a second wireless communication device associated with the BSS. The first wireless communication device determines a received signal strength indicator (RSSI) value of the plurality of received packets, determines a level of overlapping basic service set (OBSS) interference on the wireless medium during the measurement window, and adjusts one or more of a packet detect (PD) threshold, an OBSS PD threshold, or an energy detect (ED) threshold based on the determined RSSI value and the level of OBSS interference.

    IN-PHASE AND QUADRATURE-PHASE ESTIMATION AND CORRECTION USING KERNEL ANALYSIS
    6.
    发明申请
    IN-PHASE AND QUADRATURE-PHASE ESTIMATION AND CORRECTION USING KERNEL ANALYSIS 审中-公开

    公开(公告)号：US20200244509A1

    公开(公告)日：2020-07-30

    申请号：US16259924

    申请日：2019-01-28

    申请人： QUALCOMM Incorporated

    发明人： Hao Zhou ,  Kapil Rai ,  James Gardner ,  Manyuan Shen ,  Zhiqun Liu

    IPC分类号： H04L27/38 ,  H04L1/00 ,  H04L27/00

    摘要： Methods, systems, and devices for wireless communications are described. A device may receive a signal, such as a wideband or narrowband signal, and determine an in-phase and quadrature-phase imbalance of the signal, a phase and amplitude of the signal, a conjugate of the signal, or any combination thereof. Based on the in-phase and quadrature-phase imbalance, the device may determine a kernel set having a set of in-phase and quadrature-phase imbalance correction terms and select an in-phase and quadrature-phase imbalance correction term from the set based on a selection criteria. The device may then apply the in-phase and quadrature-phase imbalance correction term to the signal.