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    CORRECTION OF FREQUENCY OFFSET BETWEEN INITIATOR AND REFLECTOR
    41.
    发明申请
    CORRECTION OF FREQUENCY OFFSET BETWEEN INITIATOR AND REFLECTOR 有权

    公开(公告)号：US20220174633A1

    公开(公告)日：2022-06-02

    申请号：US17107316

    申请日：2020-11-30

    Applicant: Silicon Laboratories Inc.

    Inventor： Michael A. Wu ,  Wentao Li ,  John M. Khoury ,  Yan Zhou

    IPC: H04W56/00

    Abstract: A method for communicating between a first radio frequency communications device including a first local oscillator and a second radio frequency communications device including a second local oscillator includes generating phase values based on samples of a received signal. Each of the phase values indicates an instantaneous phase of the received signal. The method includes unwrapping the phase values to generate unwrapped phase values. The method includes generating frequency offset estimates based on the unwrapped phase values. The method includes generating an average frequency offset estimate based on the unwrapped phase values. The method includes wrapping the average frequency offset estimate to generate a residual frequency offset estimate. The method includes adjusting the first local oscillator based on the residual frequency offset estimate, thereby reducing a frequency offset between the first local oscillator and the second local oscillator.

    FREQUENCY OFFSET COMPENSATION AT REFLECTOR DURING FREQUENCY COMPENSATION INTERVAL
    42.
    发明申请
    FREQUENCY OFFSET COMPENSATION AT REFLECTOR DURING FREQUENCY COMPENSATION INTERVAL 有权

    公开(公告)号：US20220173946A1

    公开(公告)日：2022-06-02

    申请号：US17107305

    申请日：2020-11-30

    Applicant: Silicon Laboratories Inc.

    Inventor： Michael A. Wu ,  Wentao Li ,  Yan Zhou

    IPC: H04L27/06 ,  H03L7/23 ,  H03D7/16 ,  H04L27/00

    Abstract: A method for communicating between a first radio frequency communications device including a first local oscillator and a second radio frequency communications device including a second local oscillator includes receiving a packet using a receiver of the first radio frequency communications device. The method includes detecting an average frequency offset based on sequential samples of the packet. The method includes applying a first adjustment to the first local oscillator to reduce a frequency offset between the first local oscillator and the second local oscillator. The first adjustment is based on the average frequency offset. The method includes, after adjusting the first local oscillator, transmitting a second packet to the second radio frequency communications device by the first radio frequency communications device using the first adjustment and the first local oscillator.

    ZigBee, thread and BLE signal detection in a WiFi environment
    44.
    发明授权
    ZigBee, thread and BLE signal detection in a WiFi environment 有权

    公开(公告)号：US11184272B2

    公开(公告)日：2021-11-23

    申请号：US16218672

    申请日：2018-12-13

    Applicant: Silicon Laboratories Inc.

    Inventor： Yan Zhou ,  Wentao Li ,  Terry Lee Dickey

    IPC: H04L12/26 ,  H04L29/06 ,  H04L5/00 ,  H04L27/10 ,  H04W52/14 ,  H04L7/00

    Abstract: A system and method of minimizing interference and retries in an environment where two or more network protocols utilize the same frequency spectrum is disclosed. A lower-power network controller is co-located with a WIFI controller. The lower-power network controller listens for a signature that may indicate the presence of a low power protocol packet, such as BLE or Zigbee. The lower-power controller checks for a waveform that is representative of a Zigbee packet prior to generating a request signal to the WIFI controller. This maximizes the likelihood that no WIFI traffic will occur while the incoming packet is being received.

    Apparatus for Receiver With Digital Signal Arrival Detector and Associated Methods
    46.
    发明申请
    Apparatus for Receiver With Digital Signal Arrival Detector and Associated Methods 审中-公开
    具有数字信号到达检测器和相关方法的接收机装置

    公开(公告)号：US20160277177A1

    公开(公告)日：2016-09-22

    申请号：US15168080

    申请日：2016-05-29

    Applicant: Silicon Laboratories Inc.

    Inventor： Hendricus de Ruijter ,  Ping Xiong ,  Wentao Li ,  Yan Zhou

    IPC: H04L7/04 ,  H04B17/318 ,  H04L27/14 ,  H04B1/16

    CPC classification number: H04L7/042 ,  G06F13/4295 ,  H04B1/16 ,  H04B17/318 ,  H04J3/0608 ,  H04J3/1605 ,  H04L27/14 ,  H04W56/00

    Abstract: An apparatus includes a radio frequency (RF) receiver, which includes a digital signal arrival (DSA) detector to detect arrival of a transmitted signal. The DSA detector includes a signal correlator and at least one of (a) an absolute received signal strength indication (RSSI) detector; (b) a relative RSSI detector; and (c) a frequency offset detector). The RF receiver further includes a demodulator coupled to the DSA detector to demodulate a received signal and to provide a demodulated signal, and a synchronization word detector (SWD) coupled to the demodulator to receive the demodulated signal.

    Abstract translation: 一种装置包括射频（RF）接收机，其包括用于检测发射信号到达的数字信号到达（DSA）检测器。 DSA检测器包括信号相关器和（a）绝对接收信号强度指示（RSSI）检测器中的至少一个; （b）相对RSSI检测器; 和（c）频率偏移检测器）。 RF接收机还包括耦合到DSA检测器以解调接收信号并提供解调信号的解调器，以及耦合到解调器以接收解调信号的同步字检测器（SWD）。

    One Way Ranging Synchronization And Measurement
    47.
    发明申请
    One Way Ranging Synchronization And Measurement 有权

    公开(公告)号：US20230015164A1

    公开(公告)日：2023-01-19

    申请号：US17486037

    申请日：2021-09-27

    Applicant: Silicon Laboratories Inc.

    Inventor： Terry Lee Dickey ,  Yan Zhou ,  Michael Wu

    IPC: G01S13/40 ,  G01S5/02

    Abstract: A system and method for one-way ranging is disclosed. The system comprises a transmitter, also referred to as tag, transmitting a packet having a first frequency. The receiver, also referred to as the locator, receives the first frequency and measures the phase at a specific point in time. At a predetermined time, the transmitter switches to a second frequency. This is performed while maintaining phase continuity. The receiver also switches to the second frequency at nearly the same time. The receiver then measures the phase of the second frequency at a second point in time. Based on these two phase measurements, the distance between the transmitter and the receiver may be calculated.

    One way ranging measurement using sounding sequence
    50.
    发明授权
    One way ranging measurement using sounding sequence 有权

    公开(公告)号：US11368203B1

    公开(公告)日：2022-06-21

    申请号：US17486042

    申请日：2021-09-27

    Applicant: Silicon Laboratories Inc.

    Inventor： Terry Lee Dickey ,  Yan Zhou ,  Wentao Li ,  Michael Wu

    IPC: H04B7/06 ,  H04L7/00 ,  H04L5/00

    Abstract: A system and method for one-way ranging is disclosed. The system comprises a transmitter, also referred to as a tag, transmitting a packet having a sounding sequence. The receiver, also referred to as the locator, receives the sounding sequence. The receiver measures and saves the phase at a plurality of points in time. The sounding sequence has two frequencies, which are additive inverses of one another. A discrete Fourier transform is performed on the plurality of phase measurements to determine the phase of each of the two frequencies. The difference between these two frequencies is related to the time that the packet traveled. Additionally, a calibration of the transmit path and/or receive path may be performed to improve the accuracy of the results.

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