I/WE CLAIM:
1. A wireless apparatus, comprising:
at least one memory storing computer-executable instructions; and at least one processor to access the at least one memory, wherein the at least one processor is to execute the computer-executable instructions to:
cause wireless transmission of a high efficiency (HE) packet having a physical layer (PHY) preamble, the PHY preamble including a legacy short training field (L-STF), a legacy long training field (L-LTF) immediately following the L-STF, a legacy signal field (L-SIG) immediately following the L-LTF, a repeated signal field (RL-SIG) immediately following the L-SIG, a high efficiency signal field (HE-SIG) immediately following the RL-SIG, a high efficiency short training field (HE-STF) immediately following the HE-SIG, a high efficiency long training field (HE-LTF) immediately following the HE-STF, wherein:
the L-SIG includes a rate field and a length field; the HE-SIG includes a first high efficiency signal symbol (HE-SIG-1) and a second high efficiency signal symbol (HE-SIG-2); and the RL-SIG is a repetition of the L-SIG; and set a value of the length field of the L-SIG such that the value of the length field is not divisible by three, wherein the repetition and the value of the length field not being divisible by three are to indicate that the packet is a HE packet.
2. The apparatus of claim 1, wherein the HE-SIG-1 and the HE-SIG-2 exhibit a mapping onto a binary phase shift keying (BPSK) constellation.
3. The apparatus of claim 2, wherein the HE-SIG-1 and the HE-SIG-2 exhibit a mapping onto a binary phase shift keying (BPSK) constellation such that the HE-SIG-1 and the HE-SIG-2 present a phase rotation of 90 degrees with respect to one another.

4. The apparatus of any one of claims 1 and 2, wherein the HE-SIG consists ofHE-SIG-land HE-SIG-2.
5. The apparatus of any one of claims 1-3, wherein the HE-LTF includes one, two or eight HE-LTFs.
6. The apparatus of claim 5, wherein each HE-LTF of the one or two HE-LTFs has a duration of 4 u.s.
7. The apparatus of any one of claims 2 and 3, further including hardware to map the HE-SIG-1 and the HE-SIG-2 onto a binary phase shift keying (BPSK) constellation.
8. The apparatus of any one of claims 1-3, further comprising a transceiver to transmit or receive packets using radio frequency signals, the transceiver to include a low-noise amplifier and an analog-to-digital converter.
9. The apparatus of claim 8, further including a memory to store one or more operating systems.
10. The apparatus of claim 9, further including one or more antennas coupled to the transceiver, the antennas including MIMO antennas.
11. A non-transitory computer-readable medium storing computer-executable instructions which, when executed by a processor, cause the processor to perform operations comprising:
causing wireless transmission of a high efficiency (HE) packet having a physical layer (PHY) preamble, the PHY preamble including a legacy short training field (L-STF), a legacy long training field (L-LTF) immediately following

the L-STF, a legacy signal field (L-SIG) immediately following the L-LTF, a repeated signal field (RL-SIG) immediately following L-SIG, a high efficiency signal field (HE-SIG) immediately following RL-SIG, a high efficiency short training field (HE-STF) immediately following the HE-SIG, a high efficiency long training field (HE-LTF) immediately following the HE-STF, wherein:
the L-SIG includes a rate field and a length field;
the HE-SIG consists includes a first high efficiency signal symbol (HE-SIG-1) and a second high efficiency signal symbol (HE-SIG-2); and
the RL-SIG is a repetition of the L-SIG; and setting a value of the length field of the L-SIG such that the value of the length field is not divisible by three, wherein the repetition and the value of the length field not being divisible by three are to indicate that the packet is a HE packet.
12. The non-transitory computer-readable medium of claim 11, wherein the operations include mapping the HE-SIG-1 and the HE-SIG-2 onto a binary phase shift keying (BPSK) constellation.
13. The non-transitory computer-readable medium of claim 12, wherein the operations include mapping the HE-SIG-1 and the HE-SIG-2 onto a binary phase shift keying (BPSK) constellation such that the HE-SIG-1 and the HE-SIG-2 present a phase rotation of 90 degrees with respect to one another.
14. The non-transitory computer-readable medium of any one of claims 11 and 12, wherein the HE-SIG consists of the HE-SIG-1 and the HE-SIG-2.
15. The non-transitory computer-readable medium of any one of claims 11-13, wherein HE-LTF includes one, two or eight HE-LTFs, and wherein each HE-LTF of the one or two HE-LTFs has a duration of 4 u.s.

16. A method to operate a wireless apparatus, the method comprising:
causing wireless transmission of a high efficiency (HE) packet having a
physical layer (PHY) preamble, the PHY preamble including a legacy short training field (L-STF), a legacy long training field (L-LTF) immediately following the L-STF, a legacy signal field (L-SIG) immediately following the L-LTF, a repeated signal field (RL-SIG) immediately following the L-SIG, a high efficiency signal field (HE-SIG) immediately following the RL-SIG, a high efficiency short training field (HE-STF) immediately following the HE-SIG, a high efficiency long training field (HE-LTF) immediately following the HE-STF, wherein:
the L-SIG includes a rate field and a length field;
the HE-SIG consists includes a first high efficiency signal symbol (HE-SIG-1) and a second high efficiency signal symbol (HE-SIG-2); and
the RL-SIG is a repetition of the L-SIG; and setting a value of the length field of the L-SIG such that the value of the length field is not divisible by three, wherein the repetition and the value of the length field not being divisible by three are to indicate that the packet is a HE packet.
17. The method of claim 16, further including mapping the HE-SIG-1 and the HE-SIG-2 onto a binary phase shift keying (BPSK) constellation.
18. The method of claim 17, further including mapping the HE-SIG-1 and the HE-SIG-2 onto a binary phase shift keying (BPSK) constellation such that the HE-SIG-1 and the HE-SIG-2 present a phase rotation of 90 degrees with respect to one another.
19. The method of any one of claims 16 and 17, wherein the HE-SIG consists

of the HE-SIG-1 and the HE-SIG-2.
20. The method of claim 16, wherein the HE-LTF includes one, two or eight
HE-LTFs, and wherein each HE-LTF of the one or two HE-LTFs has a duration of 4
us.
21. A wireless apparatus, comprising:
at least one memory storing computer-executable instructions; and at least one processor to access the at least one memory, wherein the at least one processor is to execute the computer-executable instructions to:
receive a high efficiency (HE) packet having a physical layer (PHY) preamble, the PHY preamble including a legacy short training field (L-STF), a legacy long training field (L-LTF) immediately following the L-STF, a legacy signal field (L-SIG) immediately following the L-LTF, a repeated signal field (RL-SIG) immediately following the L-SIG, a high efficiency signal field (HE-SIG) immediately following the RL-SIG, a high efficiency short training field (HE-STF) immediately following the HE-SIG, a high efficiency long training field (HE-LTF) immediately following the HE-STF, wherein:
the L-SIG includes a rate field and a length field;
the HE-SIG includes a first high efficiency signal symbol (HE-SIG-1) and a second high efficiency signal symbol (HE-SIG-2);
the RL-SIG is a repetition of the L-SIG; and
a value of the length field of the L-SIG is not divisible by three;
identify the packet as a HE packet based on determining the repetition and based on determining that the value of the length field is not divisible by three.
22. The apparatus of claim 21, wherein the at least one processor is to

execute the computer-executable instructions to demodulate the HE-SIG-1 and the HE-SIG-2, and wherein the HE-SIG1 and the HE-SIG-2 exhibit a mapping onto a binary phase shift keying (BPSK) constellation.
23. The apparatus of claim 22, wherein the HE-SIG-1 and the HE-SIG-2 present a phase rotation of 90 degrees with respect to one another.
24. The apparatus of any of claims 21-22, wherein the at least one processor is to execute the computer-executable instructions to demodulate the HE-SIG-1 and the HE-SIG-2, and wherein the HE-SIG consists of the HE-SIG-1 and the HE-SIG-2.
25. The apparatus of any one of claims 21-23, wherein:
the at least one processor is to execute the computer-executable instructions to demodulate the HE-LTF; and
the HE-LTF includes one, two or eight HE-LTFs, each HE-LTF of the one or two HE-LTFs having a duration of 4 u.s.
26. The apparatus of any one of claims 21-23, further comprising:
a transceiver to transmit or receive packets using radio frequency signals, the transceiver to include a low-noise amplifier and an analog-to-digital converter; and
a memory to store one or more operating systems.
27. The apparatus of claim 26, further including one or more antennas coupled to the transceiver, the antennas including MIMO antennas.
28. A non-transitory computer-readable medium storing computer-executable instructions which, when executed by a processor, cause the

processor to perform operations comprising:
receiving a high efficiency (HE) packet having a physical layer (PHY) preamble, the PHY preamble including a legacy short training field (L-STF), a legacy long training field (L-LTF) immediately following the L-STF, a legacy signal field (L-SIG) immediately following the L-LTF, a repeated signal field (RL-SIG) immediately following the L-SIG, a high efficiency signal field (HE-SIG) immediately following the RL-SIG, a high efficiency short training field (HE-STF) immediately following the HE-SIG, a high efficiency long training field (HE-LTF) immediately following the HE-STF, wherein:
the L-SIG includes a rate field and a length field;
the HE-SIG includes a first high efficiency signal symbol (HE-SIG-1) and a second high efficiency signal symbol (HE-SIG-2);
the RL-SIG is a repetition of the L-SIG; and
a value of the length field of the L-SIG is not divisible by three;
identifying the packet as a HE packet based on determining the repetition and based on determining that the value of the length field is not divisible by three.
29. The non-transitory computer-readable medium of claim 28, the operations further including demodulating the HE-SIG-1 and the HE-SIG-2, wherein the HE-SIG1 and the HE-SIG-2 are mapped onto a binary phase shift keying (BPSK) constellation.
30. The non-transitory computer-readable medium of claim 29, wherein the HE-SIG-1 and the HE-SIG-2 present a phase rotation of 90 degrees with respect to one another.
31. The non-transitory computer-readable medium of any one of claims 28

and 29, the operations further including demodulating the HE-SIG-1 and the HE-SIG-2, wherein the HE-SIG consists of the HE-SIG-1 and the HE-SIG-2.
32. The non-transitory computer-readable medium of any one of claims 28-
30, the operations further including demodulating the HE-LTF, wherein the HE-
LTF includes one, two or eight HE-LTFs, and wherein each HE-LTF of the one or
two HE-LTFs has a duration of 4 u.s.
33. A method of operating a wireless apparatus, the method including:
receiving a high efficiency (HE) packet having a physical layer (PHY)
preamble, the PHY preamble including a legacy short training field (L-STF), a legacy long training field (L-LTF) immediately following the L-STF, a legacy signal field (L-SIG) immediately following the L-LTF, a repeated signal field (RL-SIG) immediately following the L-SIG, a high efficiency signal field (HE-SIG) immediately following the RL-SIG, a high efficiency short training field (HE-STF) immediately following the HE-SIG, a high efficiency long training field (HE-LTF) immediately following the HE-STF, wherein:
the L-SIG includes a rate field and a length field;
the HE-SIG includes a first high efficiency signal symbol (HE-SIG-1) and a second high efficiency signal symbol (HE-SIG-2);
the RL-SIG is a repetition of the L-SIG; and
a value of the length field of the L-SIG is not divisible by three;
identifying the packet as a HE packet based on determining the repetition and based on determining that the value of the length field is not divisible by three.
34. The method of claim 33, further including demodulating the HE-SIG-1
and the HE-SIG-2, wherein the HE-SIG1 and the HE-SIG-2 are mapped onto a

binary phase shift keying (BPSK) constellation.
35. The method of claim 34, wherein the HE-SIG-1 and the HE-SIG-2 present a phase rotation of 90 degrees with respect to one another.
36. The method of any one of claims 33 and 34, further including demodulating the HE-SIG-1 and the HE-SIG-2, wherein the HE-SIG consists of the HE-SIG-1 and the HE-SIG-2.
37. The method of any one of claims 33-35, further including demodulating the HE-LTF, wherein the HE-LTF includes one, two or eight HE-LTFs.
38. The method of claim 37, wherein each HE-LTF of the one or two HE-LTFs has a duration of 4 u.s.