Time slotted scan receiver
In one embodiment, an apparatus of a wireless communication device includes control circuitry to cause receiver circuitry of the wireless communication device to switch between an on-mode and an off-mode. The apparatus also includes synchronizing circuitry to: perform a correlation on signals of a packet received by the receiver circuitry when in the on-mode to detect a pattern in the received signals, and cause the control circuitry to hold the receiver circuitry in the on-mode based on detection of the pattern in the received signals. The apparatus further includes demodulation circuitry to process additional signals of the packet received by the receiver circuitry when held in the on-mode.
1. An apparatus of a wireless communication device, the apparatus comprising:
control circuitry to cause receiver circuitry of the wireless communication device to switch between an on-mode and an off-mode;
synchronizing circuitry to:
perform a correlation on signals of a packet received by the receiver circuitry when in the on-mode to detect a bit pattern in the received signals, wherein the correlation is based on testing multiple packet timing hypotheses; and
cause the control circuitry to hold the receiver circuitry in the on-mode based on detection of the bit pattern in the received signals; and
demodulation circuitry to process additional signals of the packet received by the receiver circuitry when held in the on-mode.
2. The apparatus of claim 1 , wherein the control circuitry is further to turn off a low noise amplifier (LNA) of the wireless communication device when the receiver circuitry is in an off-mode.
3. The apparatus of claim 1 , wherein the synchronizing circuitry comprises a 4-symbol-based correlator circuit to perform the correlation.
4. The apparatus of claim 1 , wherein the synchronizing circuitry is further to terminate the correlation based on detection of no recognized bit pattern in the received signals.
5. The apparatus of claim 1 , wherein the control circuitry is to cause the receiver circuitry to switch between the on-mode and the off-mode in a static timing pattern.
6. The apparatus of claim 1 , wherein the control circuitry is to cause the receiver circuitry to switch between the on-mode and the off-mode in a dynamically determined timing pattern based on at least one of a detection of wireless interference or a determined signal-to-noise ratio (SNR).
7. The apparatus of claim 1 , wherein the synchronizing circuitry is to perform the correlation to detect at least one of preamble data and access address data of a Bluetooth Low Energy (BLE) advertising packet.
8. The apparatus of claim 1 , wherein the synchronizing circuitry is to perform the correlation to detect at least one of at least one of access code data and packet header data of a Bluetooth Basic Rate (BR) packet.
9. The apparatus of claim 1 , wherein:
the receiver circuitry comprises an analog filter circuit comprising input terminals and one or more circuit elements; and
the control circuitry is further to:
connect the circuit elements of the analog filter circuit to a supply voltage when the receiver circuitry is in the off-mode; and
short input terminals of the analog filter circuit for a duration of time upon switching the receiver circuitry to the on-mode.
10. The apparatus of claim 1 , wherein the synchronizing circuitry is further to:
generate at least a portion of an access address code; and
compare the generated access address code portion to the signals of the packet received by the receiver circuitry.
11. The apparatus of claim 1 , wherein the receiver circuitry comprises RF analog circuitry and digital front-end circuitry, and the control circuitry is to synchronously switch the RF analog circuitry and the digital front-end circuitry between an on-mode and an off-mode.
12. The apparatus of claim 1 , further comprising error detection circuitry to:
detect an error in the additional signals of the packet; and
discard the packet based on detection of the error in the additional signals.
13. The apparatus of claim 12 , wherein the error detection circuitry is to detect an error in the additional signals of the packet by:
computing a cyclical redundancy check (CRC) value based on the additional signals of the packet; and
comparing the computed CRC value with a CRC value in the additional signals of the packet to detect an error.
14. A method for time-slotted wireless device operation, comprising:
switching receiver circuitry of a wireless communication device between an on-mode and an off-mode;
performing a correlation on signals of a packet received by the receiver circuitry when in the on-mode to detect a bit pattern in the received signals, wherein performing the correlation comprises testing multiple packet timing hypotheses;
holding the receiver circuitry in the on-mode based on detection of the bit pattern in the received signals; and
processing additional signals of the packet received by the receiver circuitry when held in the on-mode.
15. The method of claim 14 , further comprising turning off a low noise amplifier (LNA) of the wireless communication device when the receiver circuitry is in an off-mode.
16. The method of claim 14 , further comprising:
connecting circuit elements of an analog filter circuit in the receiver circuitry to a supply voltage when the receiver circuitry is in the off-mode; and
shorting input terminals of the analog filter circuit for a duration of time upon switching the receiver circuitry to the on-mode.
17. A non-transitory computer-readable medium comprising instructions that are, when executed by processing circuitry, to:
switch receiver circuitry of a wireless communication device between an on-mode and an off-mode;
perform a correlation on signals of a packet received by the receiver circuitry when in the on-mode to detect a bit pattern in the received signals, wherein the correlation is based on testing multiple packet timing hypotheses;
hold the receiver circuitry in the on-mode based on detection of the bit pattern in the received signals; and
process additional signals of the packet received by the receiver circuitry when held in the on-mode.
18. The non-transitory computer-readable medium of claim 17 , wherein the instructions are further to turn off a low noise amplifier (LNA) of the wireless communication device when the receiver circuitry is in an off-mode.
19. The non-transitory computer-readable medium of claim 17 , wherein the instructions are further to terminate the correlation based on detection of no recognized bit pattern in the received signals.
20. The non-transitory computer-readable medium of claim 17 , wherein the instructions are to switch the receiver circuitry between the on-mode and the off-mode in a static timing pattern.
21. The non-transitory computer-readable medium of claim 17 , wherein the instructions are to switch the receiver circuitry between the on-mode and the off-mode in a dynamically determined timing pattern based on at least one of a detection of wireless interference or a determined signal-to-noise ratio (SNR).
22. The non-transitory computer-readable medium of claim 17 , wherein the instructions are further to:
generate at least a portion an access address code; and
compare the generated access address code portion to the signals of the packet received by the receiver circuitry.
23. The non-transitory computer-readable medium of claim 17 , wherein the packet is one of a Bluetooth Low Energy (BLE) advertising packet and a Bluetooth Basic Rate (BR) packet.