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Carrier frequency error estimation using a bank of estimators with limited acquisition range

專利號
US11930461B2
公開日期
2024-03-12
申請人
SAMSUNG ELECTRONICS CO., LTD.（KR Suwon-si）
發(fā)明人
Farshid Nowshadi; Jacob Christopher Sharpe
IPC分類
H04W56/00; H04L27/00
技術(shù)領(lǐng)域
frequency,offset,estimator,baseline,estimation,may,e.g,in,some,aspects
地域： Suwon-si

摘要

Techniques and systems for extending the capture range of frequency offset error detection are described. For instance, the present disclose describes efficient frequency estimation structures (e.g., zero crossing minimum/maximum (min/max) structures) that may extend carrier frequency offset error capture range by running a bank (e.g., a set) of parallel capture range structures trialing different frequency errors. In some aspects, a set of frequency offset estimation circuits and a set of correlation circuits (e.g., 1-bit correlators) may be used on parallel streams to perform correlation operations on each branch of a received bit stream to determine correlations with known preamble patterns (e.g., to accurately estimate large frequency offset errors).

說明書

BACKGROUND

The following relates generally to wireless communications, and more specifically to Bluetooth carrier frequency error estimation using a bank of estimators with limited acquisition range.

Communications systems (e.g., wireless communications systems) are deployed to provide various communication services such as data services, video services, audio services, messaging services, telecommunication services, broadcast services, etc. Further, communications systems may employ various technologies according to certain protocols to support communications between devices (e.g., to make communications compatible between differing devices, to share available system resources efficiently, etc.).

Communications devices may implement communication techniques using various hardware and software components, which in some examples may include usage of a crystal oscillator. A crystal oscillator is a device that typically employs an amplifier and a crystal to generate a fixed frequency signal (e.g., based on the intrinsic frequency of a piezoelectric crystal resonator). The crystal is made from of a small slice of piezoelectric material having a shape that physically resonates at a desired (natural) frequency, such that the crystal acts like a filter having a bandpass around its natural frequency. The natural frequency is a function of a process type and size of the crystal. The fixed frequency signal of the crystal oscillator is variable according to the crystal's natural frequency and frequency tuning circuitry coupled to the crystal. Thus, the crystal oscillator is formed by a combination of the crystal within a circuit that resonates at or near the natural frequency of the crystal.

權(quán)利要求

1
What is claimed is:1. A method comprising:identifying a plurality of baseline frequencies;estimating a plurality of frequency offsets for a signal, wherein each of the plurality of frequency offsets corresponds to a baseline frequency of the plurality baseline frequencies;selecting a frequency offset from the plurality of frequency offsets; anddemodulating the signal using the selected frequency offset.2. The method of claim 1, further comprising:identifying a first baseline frequency corresponding to an unmodified baseline frequency of the signal;identifying a second bassline frequency that is higher than the first baseline frequency; andidentifying a third baseline frequency that is lower than the first baseline frequency, wherein the plurality of baseline frequencies includes the first baseline frequency, the second baseline frequency and the third baseline frequency.3. The method of claim 2, wherein:an absolute difference between the first baseline frequency and the second baseline frequency is equal to an absolute difference between the first baseline frequency and the third baseline frequency.4. The method of claim 1, further comprising:selecting the plurality of baseline frequencies based on a historical distribution of frequency offsets.5. The method of claim 1, further comprising:performing a zero-crossing min-max operation on the signal based on each of the plurality of baseline frequencies, wherein the plurality of frequency offsets are estimated based on the zero-crossing min-max operation.6. The method of claim 1, further comprising:performing a correlation operation on the signal for each of the plurality of frequency offsets to obtain a correlation value corresponding to each of the plurality of frequency offsets, wherein the frequency offset is selected based on the correlation value.7. The method of claim 6, further comprising:identifying a highest correlation value among the correlation values corresponding to the plurality of frequency offsets, wherein the frequency offset is selected based on the highest correlation value.8. The method of claim 6, wherein:the correlation operation is performed on a preamble of the signal.9. The method of claim 6, wherein:the correlation operation is performed on an Access Address, an access word, or a sync word of the signal.10. The method of claim 1, further comprising:computing a first frequency offset first from among the plurality of frequency offsets before computing other frequency offsets of the plurality of frequency offsets, wherein the frequency offset is selected based at least in part on computing the first frequency offset first.11. The method of claim 10, further comprising:identifying a waiting time; andwaiting for a second frequency offset after receiving the first frequency offset based on the waiting time.12. The method of claim 1, wherein:the signal comprises a Bluetooth Low Energy (BLE) signal.13. The method of claim 1, further comprising:converting signal to a phase representation; andincrementing a phase difference of the signal to obtain a plurality of phase signals corresponding plurality of baseline frequencies.14. A method comprising:identifying a plurality of baseline frequencies;selecting a plurality of sample sets from a signal, wherein each of the samples sets corresponds to one of the plurality of baseline frequencies;detecting a zero crossing point corresponding to each of the plurality of baseline frequencies based on the corresponding sample set;estimating a frequency offset for each of the plurality of baseline frequencies based on the corresponding zero crossing point; andselecting the frequency offset corresponding to a highest correlation value for demodulating the signal.15. The method of claim 14, further comprising:performing a correlation operation on the signal based on the frequency offset to obtain the correlation value.16. The method of claim 14, further comprising:demodulating the signal using the selected frequency offset.17. An apparatus comprising:a receiver configured to receive a signal;a plurality of frequency offset estimation circuits configured to estimate a plurality of frequency offsets for the signal, wherein each of the plurality of frequency offset estimation circuits operates based on a different baseline frequency from a plurality baseline frequencies; andan offset selection circuit configured to select a frequency offset from the plurality of frequency offsets.18. The apparatus of claim 17, further comprising:a demodulator configured to demodulate the signal based on the selected frequency offset.19. The apparatus of claim 17, further comprising:a plurality of correlation circuits configured to perform a correlation operation on the signal, wherein each of the plurality of correlation circuits obtains a correlation value for a corresponding frequency offset of the plurality of frequency offsets.20. The apparatus of claim 17, wherein:the plurality of frequency offset estimation circuits are configured to perform a zero-crossing min-max operation on the signal based on a corresponding baseline frequency of the plurality of baseline frequencies.
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