-
公开(公告)号：US11502883B2
公开(公告)日：2022-11-15
申请号：US17108912
申请日：2020-12-01
Applicant: Silicon Laboratories Inc.
Inventor： Wentao Li , Michael A. Wu , Yan Zhou
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：US20220174632A1
公开(公告)日：2022-06-02
申请号：US17107281
申请日：2020-11-30
Applicant: Silicon Laboratories Inc.
Inventor： John M. Khoury , Yan Zhou , Michael A. Wu
IPC: H04W56/00
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：US20220174453A1
公开(公告)日：2022-06-02
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 , G01S11/02 , H04L12/26 , G01R23/175
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：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
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：US12127144B2
公开(公告)日：2024-10-22
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
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.
-
Patent Agency Ranking
公开(公告)号：US11737038B2
公开(公告)日：2023-08-22
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
CPC classification number: H04W56/0035 , H04W56/005 , H04W56/0055 , H04W52/0287
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.
-
公开(公告)号：US11743852B2
公开(公告)日：2023-08-29
申请号：US17107281
申请日：2020-11-30
Applicant: Silicon Laboratories Inc.
Inventor： John M. Khoury , Yan Zhou , Michael A. Wu
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：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.
-
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
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：US20220173756A1
公开(公告)日：2022-06-02
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
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.
-
-
-
-
-
-
-
-
-
Search Results
14
records
(took 0.028 seconds)
