公开(公告)号：US20230337160A1

公开(公告)日：2023-10-19

申请号：US18215488

申请日：2023-06-28

Applicant: Silicon Laboratories Inc.

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

IPC: H04W56/00

CPC classification number: H04W56/0035 ,  H04W56/005 ,  H04W4/023

Abstract: In at least one embodiment, a method for measuring a distance between a first communications device including a first local oscillator and a second communications device including a second local oscillator includes unwrapping N phase values to generate N unwrapped phase values. N is an integer greater than one. Each of the N phase values indicate an instantaneous phase of a received signal. The method includes averaging the N unwrapped phase values to generate an average phase value. The method includes wrapping the average phase value to generate a final phase measurement of the first local oscillator with respect to the second local oscillator.

公开(公告)号：US11638116B2

公开(公告)日：2023-04-25

申请号：US17108908

申请日：2020-12-01

Applicant: Silicon Laboratories Inc.

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

IPC: H04W4/02 ,  G01R23/175 ,  H04L43/0852 ,  G01S11/02

Abstract: A receiver includes a first discrete Fourier transform (DFT) block to perform a first single tone DFT on a positive tone associated with a sounding sequence. A second DFT block performs a second single tone DFT on a negative tone associated with the sounding sequence. A DFT coefficient generation block generates first DFT coefficients based on a nominal frequency of the positive tone and an estimated frequency offset between a transmitter frequency and a receiver frequency. The DFT coefficient generation block generates second DFT coefficients based on a nominal frequency of the negative tone and the estimated frequency offset. Multipliers in the DFT blocks multiply I and Q values of the sounding sequence with the coefficients. Accumulators in the DFT blocks accumulate multiplier outputs. An arctan function receives averaged accumulated values from the first and second DFT blocks and supplies first and second phase values used to calculate fractional timing.

公开(公告)号：US11438200B2

公开(公告)日：2022-09-06

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 ,  H04L27/00 ,  H03D7/16

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.

公开(公告)号：US11431359B2

公开(公告)日：2022-08-30

申请号：US17107327

申请日：2020-11-30

Applicant: Silicon Laboratories Inc.

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

IPC: H04B1/04 ,  H04L25/06 ,  H03D3/00 ,  H04B1/30 ,  H04B1/00

Abstract: A method for operating a radio frequency communications system includes, while operating a first radio frequency communications device in a calibration mode, for each setting of a plurality of settings of a programmable gain amplifier in a receiver of the first radio frequency communications device configured in a zero-intermediate frequency mode of operation, generating an estimate of a DC offset in each of a plurality of digital samples received from an analog circuit path including the programmable gain amplifier, and storing in a corresponding storage element, a compensation value based on the estimate.