Enhanced signal detection for wireless communications

1. A device, the device comprising memory and processing circuitry configured to:

determine a physical layer protocol data unit (PPDU) comprising one or more symbols, wherein the PPDU has a first time domain signal periodicity, wherein a symbol of the one or more symbols is associated with pilot subcarriers, and wherein the pilot subcarriers are associated with a contiguous phase;

cause to append a common preamble to the PPDU, wherein the common preamble comprises a common short training field and a common preamble length field, the common short training field having a second time domain signal periodicity different from the first time domain signal periodicity, and the common preamble length field indicating a length of the PPDU;

generate a frame, the frame comprising the common preamble and the PPDU, wherein the first time domain signal periodicity indicates a type of PPDU; and

cause to send the frame.

2. The device of claim 1 , wherein a symbol of the one or more symbols comprises a beginning portion and an end portion, wherein the beginning portion has a time duration, wherein the ending portion is based on the time duration, and wherein the beginning portion and the ending portion comprise the same content.

3. The device of claim 1 , wherein the type of PPDU is a WiFi PPDU, and wherein the first time domain signal periodicity is 0.8 microseconds or 1.6 microseconds.

4. The device of claim 1 , wherein the type of PPDU is a non-WiFi PPDU, and wherein the first time domain signal periodicity is a value other than 0.8 microseconds or 1.6 microseconds.

5. The device of claim 1 , wherein the memory and processing circuitry are further configured to map the common short training field based on a bandwidth associated with a frequency spectrum, and wherein to map comprises to apply a sequence [1, 1, 1, 1, 1, 1, 1, −1, −1, −1, 1, −1, 1, 1, −1, −1, −1, 1, 1, −1, 1, −1, −1, 1] to the frequency spectrum.

6. The device of claim 1 , wherein the common preamble length field is generated based on a Hadamard code, and wherein the Hadamard code is associated with the length of the PPDU.

7. The device of claim 1 , further comprising a transceiver configured to transmit and receive wireless signals.

8. The device of claim 7 , further comprising one or more antennas coupled to the transceiver.

9. A non-transitory computer-readable medium storing computer-executable instructions which when executed by one or more processors result in performing operations comprising:

identifying, at a first device, a frame comprising a physical layer protocol data unit (PPDU), a common preamble, and one or more symbols, wherein a symbol of the one or more symbols is associated with pilot subcarriers, and wherein the pilot subcarriers are associated with a contiguous phase;

determining a first time domain signal periodicity associated with a common short training field of the common preamble;

determining a common preamble length field indicating a length of the PPDU, the common preamble comprising the common preamble length field; and

determining a second time domain signal periodicity associated with the PPDU, the second time domain signal periodicity indicating a type of PPDU.

10. The non-transitory computer-readable medium of claim 9 , wherein a symbol of the one or more symbols comprises a beginning portion and an end portion, and wherein the operations further comprise determining that the beginning portion and the ending portion comprise the same content.

11. The non-transitory computer-readable medium of claim 9 , wherein a symbol of the one or more symbols comprises a beginning portion and an end portion, and wherein the operations further comprise determining that the beginning portion and the ending portion comprise different content.

12. The non-transitory computer-readable medium of claim 9 , wherein the type of PPDU is a WiFi PPDU, wherein the second time domain signal periodicity is 0.8 microseconds or 1.6 microseconds, and wherein the operations further comprise determining the one or more symbols.

13. The non-transitory computer-readable medium of claim 9 , wherein the type of PPDU is a non-WiFi PPDU, and wherein the second time domain signal periodicity is a value other than 0.8 microseconds or 1.6 microseconds.

14. The non-transitory computer-readable medium of claim 9 , wherein the common short training field is mapped based on a bandwidth associated with a frequency spectrum, and wherein to map comprises to apply a sequence [1, 1, 1, 1, 1, 1, 1, −1, −1, −1, 1, −1, 1, 1, −1, −1, −1, 1, 1, −1, 1, −1, −1, 1] to the frequency spectrum.

15. The non-transitory computer-readable medium of claim 9 , wherein the common preamble length field is generated based on a Hadamard code, and wherein the Hadamard code is associated with the length of the PPDU.

16. A method comprising:

determining, by one or more processors of a first device, determine a physical layer protocol data unit (PPDU) comprising one or more symbols, wherein the PPDU has a first time domain signal periodicity;

cause to append a common preamble to the PPDU, wherein the common preamble comprises a common short training field and a common preamble length field, the common short training field having a second time domain signal periodicity different from the first time domain signal periodicity, and the common preamble length field indicating a length of the PPDU;

mapping a sequence [1, 1, 1, 1, 1, 1, 1, −1, −1, −1, 1, −1, 1, 1, −1, −1, −1, 1, 1, −1, 1, −1, −1, 1] to a frequency spectrum associated with a bandwidth, the mapping represented by a first sequence {M, 0, −M} if a bandwidth is 40 MHz, a second sequence {−M, −1, M, 0, −M, 1, −M} if the bandwidth is 80 MHz, or by a third sequence {M, 1, −M, 0, −M, 1, −M, −M, −1, M, 0, −M, 1, −M} if the bandwidth is 160 MHz;

generate a frame, the frame comprising the common preamble and the PPDU, wherein the first time domain signal periodicity indicates a type of PPDU; and

causing to send, by the one or more processors, the frame.

17. The method of claim 16 , wherein a signal of a pilot subcarrier of the frame is represented p t 1 =a 1 sin(w 1 +φ 1 )*s t,w , where p is a pilot tone at a respective time in a time domain, t is the respective time in the time domain, a is an amplitude, w is a respective frequency in a frequency domain, φ is a phase, and s t,w is a sequence that depends on the respective time and the respective frequency.