Patent ID: 9602319
Date: 2017-03-21
CPC Classifications: H04L

Claim:
1. An apparatus of a station (STA), the apparatus comprising: memory; and, circuitry coupled to the memory, the circuitry configured to: detect a high-efficiency (HE) signal field (SIG) of a preamble of a packet based on a rotation of a signal constellation of the HE SIG different than legacy rotations of: a rotation of a first signal constellation and no rotation of a second signal constellation, and no rotation of the first signal constellation and a rotation of the second signal constellation; determine whether a first sum of power of a first received signal field is greater for an in-phase (I) component than for a quadrature (Q) component; if the first sum of power of the first received signal field is greater for the I component, then determine that the first received signal field is not the HE signal field; determine whether a second sum of power of a second received signal field is greater for the I component than for the Q component; if the second sum of power of the second received signal field is greater for the I component, then determine that the second received signal field has the rotation of the signal constellation of the HE SIG and is the HE SIG; if the HE SIG is detected, configure the STA to process remaining portions of the packet following the HE SIG in accordance with a HE format; and if the HE SIG is not detected, configure the STA to process the remaining portions of the packet following the HE SIG in accordance with a legacy format.