WAKE UP RADIO DEVICE, CIRCUIT CONFIGURATION, AND METHOD

• US 20180007629A1
• Filed: 06/29/2016
• Published: 01/04/2018
• Est. Priority Date: 06/29/2016
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel Corporation
• Inventors: DORRANCE, Richard, PARK, Minyoung, MIN, Alexander W., SHEIKH, Farhana
• Granted Patent: US 9,967,820 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04L 27/06 Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

According to the present disclosure, a communication device configured to power on a main receiver to receive data from a network includes: a low power receiver configured to receive a wake up packet, including a preamble, from the network and oversample the wake up packet; a circuit arrangement including: a correlator configured to correlate the oversampled portion of the preamble; a delay and adder configured to take an output of the correlator, delay the output of the correlator, and add the output of the correlator back onto itself to produce a delay output; a peak detector configured to detect a peak pattern in the delay output; a demodulator configured to calculate a decoding threshold value to produce a demodulated data; and a packet parser configured to check the demodulated data for a data set in order to selectively output a nonzero signal to power on the main receiver.

Claims

1. A communication device configured to power on a main receiver to receive data from a network comprising:

a low power receiver configured to receive a wake up packet, comprising a preamble, from the network and oversample the wake up packet;

a circuit arrangement comprising;

a correlator configured to correlate the oversampled portion of the preamble;

a delay and adder configured to take an output of the correlator, delay the output of the correlator, and add the output of the correlator back onto itself to produce a delay output;

a peak detector configured to detect a peak pattern in the delay output;

a demodulator configured to calculate a decoding threshold value to produce a demodulated data; and

a packet parser configured to check the demodulated data for a data set in order to selectively output a nonzero signal to power on the main receiver.

2. The communication device of claim 1, wherein the wake up packet further comprises a receiver ID, a payload, and a frame check sequence.

3. The communication device of claim 1, the low power receiver further configured to oversample the wake up packet about 16 times to generate 16 samples per bit.

4. The communication device of claim 3, the circuit arrangement further configured to average the 16 samples of each of the bits of the wake up packet.

5. The communication device of claim 1, wherein the correlator is a 240-bit correlator.

6. The communication device of claim 1, wherein the delay and adder is configured to delay the output of the correlator by about 240 cycles.

7. The communication device of claim 1, wherein the peak detector is configured to detect the peak pattern after determining that the peak pattern has a value greater than a first threshold.

8. The communication device of claim 1, the peak detector further configured to determine the peak pattern by detecting the maximum of the AD output using a rolling window, wherein the rolling window determines a local maximum of the AD output within its bounds and compares it to a previously determined maximum of the AD output.

9. The communication device of claim 8, wherein the peak detector is configured to compare the maximum of the AD output to a second threshold value.

10. The communication device of claim 9, wherein the demodulator is further configured to demodulate the data if the maximum of the AD output is greater than the second threshold value.

11. The communication device of claim 1, wherein the data set comprises a receiver ID, wherein the packet parser is further configured to check if the receiver ID matches a communication device ID.

12. A circuit arrangement comprising:

a correlator configured to correlate an oversampled portion of a preamble of a wake up packet;

a delay and adder configured to take an output of the correlator, delay the output of the correlator, and add the output of the correlator back onto itself to produce a delay output;

a peak detector configured to detect a peak pattern in the delay output;

a demodulator configured to calculate a decoding threshold value to produce a demodulated data of the wake up packet; and

a packet parser configured to check the demodulated data for a data set in order to selectively output a nonzero signal.

13. The circuit arrangement of claim 12, further comprising a receiving circuit which oversamples the wake up packet.

14. The circuit arrangement of claim 13, wherein the receiving circuit oversamples the wake up packet about 16 times to generate 16 samples per bit.

15. The circuit arrangement of claim 14, further comprising a sample averaging circuit configured to average the 16 samples of each of the bits of the wake up packet.

16. A method for a communication device to power on a first receiver, comprising:

receiving a wake up packet at a second receiver of the communication device, the wake up packet comprising a wake up preamble with a pseudorandom noise (PN) sequence, a receiver ID, a payload, and a frame check sequence (FCS);

determining whether the wake up packet should be decoded based on the wake up packet;

using the PN sequence to set a decoding threshold;

decoding the receiver ID, the payload, and the frame check sequence using the decoding threshold; and

selectively sending a signal to power on the first receiver.

17. The method of claim 16, wherein the PN sequence is repeated in the wake up preamble.

18. The method of claim 16, wherein the PN sequence is 15 bits.

19. A method in a first device to transmit a wake up packet to a second device, comprising:

coding a wake up preamble portion of the wake up packet, wherein the wake up preamble comprises a repeated pseudorandom noise (PN) sequence;

coding a data portion of the wake up packet, wherein the data portion comprises a receiver ID, a payload, and a frame check sequence; and

transmitting the wake up packet to the second device.

20. The method of claim 19, wherein the PN sequence is repeated two times.

21. The method of claim 19, further comprising coding the data portion of the wake up packet with an error correction.

22. The method of claim 21, wherein the error correction comprises coding the data portion at about a 1-to-3 rate.

23. The method of claim 19, further comprising coding the wake up preamble at about a 1-to-1 rate.