公开(公告)号：US20220173945A1

公开(公告)日：2022-06-02

申请号：US17108912

申请日：2020-12-01

Applicant: Silicon Laboratories Inc.

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

IPC: H04L27/00 ,  H04L27/14

Abstract: A mixer in a receiver converts a sounding sequence of alternating ones and zeros to an intermediate frequency signal. A digital mixer converts the intermediate frequency signal to a baseband signal that contains a positive tone and a negative tone. A frequency offset correction circuit generates frequency offset corrections based on frequency offset estimates of the frequency offset between a transmitter of the sounding sequence and the receiver. A frequency adjustment circuit adjusts a frequency of the mixer or the digital mixer to thereby center the positive tone and the negative tone around DC. DFT circuits perform single bin DFTs respectively centered on the positive and negative tones. Phases of the positive and negative tones are calculated based on outputs of the DFT circuits and the phases are used to determine fractional time value associated with a distance measurement between the transmitter and receiver.

公开(公告)号：US10992452B2

公开(公告)日：2021-04-27

申请号：US16367962

申请日：2019-03-28

Applicant: Silicon Laboratories Inc.

Inventor： Guner Arslan ,  Amey Naik ,  Yan Zhou

IPC: H04L7/04 ,  H04B1/10 ,  H04L25/06

Abstract: A wireless receiver including a front end circuit, an adaptive threshold circuit, and a correlator. The front end circuit converts a wireless signal into a series of digital symbols. The adaptive threshold circuit provides an adaptive correlation threshold that is adapted based on a sync word. The correlator correlates the digital symbols with the sync word using the adaptive correlation threshold. The adaptive correlation threshold may be based on amplitude attenuation of the digital symbols that correspond to transitions of the sync word. The adaptive threshold circuit may be a lookup table that stores different threshold values each corresponding to one of multiple different sync words. Alternatively, the adaptive threshold circuit may be implemented as an evaluation circuit that determines the adaptive correlation threshold based on expected amplitude attenuation of the digital symbols that correspond to transitions of the sync word.

公开(公告)号：US20180159706A1

公开(公告)日：2018-06-07

申请号：US15370674

申请日：2016-12-06

Applicant: Silicon Laboratories Inc.

Inventor： Ping Xiong ,  Hendricus de Ruijter ,  Amey Naik ,  Yan Zhou

IPC: H04L27/22 ,  H04B1/16

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 frequency discriminator to receive a signal derived from a received RF signal to generate a first complex signal. The DSA detector further includes a correlator coupled to receive and process the first complex signal and to generate a second complex signal. The DSA detector in addition includes a Coordinate Rotation Digital Computer (Cordic) circuit to receive and process the second complex signal to generate a phase signal and a magnitude signal.

公开(公告)号：US09036740B2

公开(公告)日：2015-05-19

申请号：US13921375

申请日：2013-06-19

Applicant: Silicon Laboratories Inc.

Inventor： John Khoury ,  Yan Zhou

IPC: H04L27/22 ,  H03D1/04

CPC classification number: H03D1/04 ,  H03D7/165 ,  H03D7/18

Abstract: An image rejection (IR) circuit is configured to receive a complex signal from a radio frequency (RF) mixer, where the complex signal includes an in-phase signal portion and a quadrature signal portion. This IR circuit may include: an in-phase path to remove first mismatch information from the in-phase signal portion and associated with at least one in-phase multi-tap filter; a quadrature path to remove second mismatch information from the quadrature signal portion and associated with at least one quadrature multi-tap filter; and a correlation unit to independently update each of the multiple taps of the in-phase multi-tap filter and the quadrature multi-tap filter according to a priority scheme.

Abstract translation: 图像抑制（IR）电路被配置为从射频（RF）混合器接收复信号，其中复信号包括同相信号部分和正交信号部分。 该IR电路可以包括：同相路径，用于从同相信号部分去除与至少一个同相多抽头滤波器相关联的第一失配信息; 从正交信号部分去除第二不匹配信息并与至少一个正交多抽头滤波器相关联的正交路径; 以及相关单元，用于根据优先级方案独立地更新同相多抽头滤波器和正交多抽头滤波器的多个抽头中的每个抽头。