A method for communicating in a wireless local area network, the method specifically adapted for: receiving, at a station, a beacon frame, the beacon frame comprising at least one basic service set identifier, BSSID, and a first color value, wherein each BSSID identifying a basic service set, BSS, managed by an access point, AP, to which the station is associated, and the first color value represented by a value number of bits, the value number less than 48; receiving, at the station, a physical layer protocol data unit, PPDU, over a transmission bandwidth, the PPDU comprising a signal-A field and a signal-B field, wherein the signal-A field comprising bandwidth information and a second color value, the bandwidth information indicating the transmission bandwidth, and the signal-B field comprising user-specific information comprising allocation for orthogonal frequency division multiple access, OFDMA, transmission; wherein the signal-A field is phase-rotated and transmitted over at least one first subcarrier group, each first subcarrier group having bandwidth of 20 MHz within the transmission bandwidth, and the signal-B is phase rotated and transmitted over a plurality of second subcarrier groups, each second subcarrier group having bandwidth that is less than 20 MHz within the transmission bandwidth; and comparing, at the station, the first color value and the second color value to determine whether the PPDU was transmitted by the AP. receiving, at a station, a beacon frame, the beacon frame comprising at least one basic service set identifier, BSSID, and a first color value, wherein each BSSID identifying a basic service set, BSS, managed by an access point, AP, to which the station is associated, and the first color value represented by a value number of bits, the value number less than 48; each BSSID identifying a basic service set, BSS, managed by an access point, AP, to which the station is associated, and the first color value represented by a value number of bits, the value number less than 48; receiving, at the station, a physical layer protocol data unit, PPDU, over a transmission bandwidth, the PPDU comprising a signal-A field and a signal-B field, wherein the signal-A field comprising bandwidth information and a second color value, the bandwidth information indicating the transmission bandwidth, and the signal-B field comprising user-specific information comprising allocation for orthogonal frequency division multiple access, OFDMA, transmission; transmission bandwidth, the PPDU comprising a signal-A field and a signal-B field, wherein the signal-A field comprising bandwidth information and a second color value, the bandwidth information indicating the transmission bandwidth, and the signal-B field comprising user-specific information comprising allocation for orthogonal frequency division multiple access, OFDMA, transmission; wherein the signal-A field is phase-rotated and transmitted over at least one first subcarrier group, each first subcarrier group having bandwidth of 20 MHz within the transmission bandwidth, and the signal-B is phase rotated and transmitted over a plurality of second subcarrier groups, each second subcarrier group having bandwidth that is less than 20 MHz within the transmission bandwidth; and the signal-A field is phase-rotated and transmitted over at least one first subcarrier group, each first subcarrier group having bandwidth of 20 MHz within the transmission bandwidth, and the signal-B is phase rotated and transmitted over a plurality of second subcarrier groups, each second subcarrier group having bandwidth that is less than 20 MHz within the transmission bandwidth; and comparing, at the station, the first color value and the second color value to determine whether the PPDU was transmitted by the AP. <EOS>