公开(公告)号：US20250088901A1

公开(公告)日：2025-03-13

申请号：US18243222

申请日：2023-09-07

Applicant: Silicon Laboratories Inc.

Inventor： Xushuai Qu ,  Guner Arslan ,  Robert Gorday ,  Yan Zhou ,  Yi Shen Yeh

IPC: H04W28/04 ,  H04L7/033

Abstract: A technique for reducing or eliminating effects of frequency and phase offset in a communications system includes implementing a demodulator having a Kalman filter based phase-locked loop for phase-shift keying or quadrature amplitude modulated signals. In an acquisition mode of operation, the Kalman filter based phase-locked loop continuously updates an error correction signal until an error between a received version of a predetermined signal transmitted using phase-shift keying or quadrature amplitude modulation and the predetermined signal is at or near zero. In a tracking mode of operation, the Kalman filter based phase-locked loop adjusts the error correction signal to maintain the error between the received signal and a predicted signal at or near zero.

公开(公告)号：US12040924B1

公开(公告)日：2024-07-16

申请号：US18172913

申请日：2023-02-22

Applicant: Silicon Laboratories Inc.

Inventor： Hendricus De Ruijter ,  Robert Gorday

IPC: H04L27/22 ,  H03H7/00 ,  H04L27/233

CPC classification number: H04L27/2334 ,  H04L27/2335

Abstract: A cluster correlator may be configured with: a first stage comprising a set of first correlators to correlate samples of an input signal with a first predetermined pattern and output an output sample, the set of first correlators to output a sample cluster corresponding to the output sample of the set of first correlators during a switching cycle of the first stage; a filter coupled to an output of the first stage to receive the sample cluster and to produce a processed output sample based on the sample cluster; and a second stage comprising at least one second correlator to receive a processed output sample from the filter and correlate the processed output sample with a second predetermined pattern, and output one or more correlation outputs during a switching cycle of the second stage.