Systems, methods, and devices for timing recovery in wireless communications devices
Systems, methods, and devices estimate timing values for data transmission associated with wireless communications devices. Methods include receiving, at a transceiver of a wireless communications device, at least one symbol included in a data transmission, obtaining a plurality of samples of the at least one symbol, and generating, using one or more processors, a plurality of correlation values for each of the plurality of samples. Methods further include generating, using the one or more processors, a multi-sample interpolation model based on at least some of the plurality of correlation values and determining, using the one or more processors, an estimated maximum correlation value and a temporal offset value based on the multi-sample interpolation model, the temporal offset value being used for a time of arrival computation.
1. A method comprising:
receiving, at a transceiver of a wireless communications device, at least one symbol included in a data transmission;
obtaining a plurality of samples of the at least one symbol;
generating, using one or more processors, a plurality of correlation values for each of the plurality of samples;
generating, using the one or more processors, a multi-sample interpolation model based on at least some of the plurality of correlation values; and
determining, using the one or more processors, an estimated maximum correlation value and a temporal offset value based on the multi-sample interpolation model, the temporal offset value being used for a time of arrival computation.
2. The method of claim 1 , wherein the plurality of correlation values is generated based on a plurality of temporal shift values.
3. The method of claim 2 , wherein the generating of the multi-sample interpolation model comprises:
determining, using the one or more processors, a best fit curve based on the at least some of the plurality of correlation values.
4. The method of claim 3 , wherein the best fit curve is parabolic.
5. The method of claim 4 , wherein the estimated maximum correlation value and the temporal offset value are determined based on a maximum value of the best fit curve.
6. The method of claim 1 , wherein the at least one symbol is included in a Bluetooth data packet.
7. The method of claim 6 , wherein the Bluetooth data packet is a Bluetooth Low Energy data packet.
8. The method of claim 1 further comprising:
determining a corrected time of arrival based on a time indicator associated with a sample and the temporal offset value.
9. The method of claim 1 , wherein the obtaining of the plurality of samples is implemented during one or more synchronization operations associated with a wireless communications device.
10. A device comprising:
a memory configured to store a plurality of data values associated with a data transmission from a wireless communications device; and
one or more processors configured to:
receive at least one symbol included in the data transmission;
obtain a plurality of samples of the at least one symbol and store the plurality of samples in the memory;
generate a plurality of correlation values for each of the plurality of samples;
access the memory and generate a multi-sample interpolation model based on at least some of the plurality of correlation values; and
determine an estimated maximum correlation value and a temporal offset value based on the multi-sample interpolation model, the temporal offset value being used for a time of arrival computation.
11. The device of claim 10 , wherein the plurality of correlation values is generated based on a plurality of temporal shift values.
12. The device of claim 11 , wherein the multi-sample interpolation model is a best fit curve determined based on the at least some of the plurality of correlation values.
13. The device of claim 12 , wherein the estimated maximum correlation value and the temporal offset value are determined based on a maximum value of the best fit curve.
14. The device of claim 10 , wherein the at least one symbol is included in a Bluetooth data packet.
15. The device of claim 10 , wherein the one or more processors are further configured to:
determine a corrected time of arrival based on a time indicator associated with a sample and the temporal offset value.
16. A system comprising:
an antenna configured to receive a data transmission comprising a plurality of Bluetooth data packets;
a transceiver comprising one or more processors configured to:
receive at least one symbol included in the data transmission;
obtain a plurality of samples of the at least one symbol;
generate a plurality of correlation values for each of the plurality of samples;
generate a multi-sample interpolation model based on at least some of the plurality of correlation values; and
determine an estimated maximum correlation value and a temporal offset value based on the multi-sample interpolation model, the temporal offset value being used for a time of arrival computation; and
a memory device configured to store the estimated maximum correlation value and the temporal offset value.
17. The system of claim 16 , wherein the plurality of correlation values is generated based on a plurality of temporal shift values.
18. The system of claim 17 , wherein the multi-sample interpolation model is a best fit curve determined based on the at least some of the plurality of correlation values.
19. The system of claim 18 , wherein the estimated maximum correlation value and the temporal offset value are determined based on a maximum value of the best fit curve.
20. The system of claim 16 , wherein the one or more processors are further configured to:
determine a corrected time of arrival based on a time indicator associated with a sample and the temporal offset value.