A method for wireless communication, comprising: a) generating by a first controller in a master wireless node a first allotment of sub-carriers (120; 220) selected from a predetermined frequency band for communication with a first slave wireless node (108, 112, 116), the first allotment of sub-carriers including at least two orthogonal sub-carriers; b) generating by the first controller in the master wireless node a second allotment of sub-carriers selected from the predetermined frequency band for communication with a second slave wireless node (108, 112, 116), the second allotment of sub-carriers including at least two orthogonal sub-carriers that are different than the at least two orthogonal sub-carriers in the first allotment of sub-carriers (120; 220); c) transmitting by a first transceiver in the master wireless node a first message to the first slave wireless node using only the first allotment of sub-carriers and a second message to the second slave wireless node using only the second allotment of sub-carriers, the first message being different than the second message and the transmission of the first message and the second message occurring concurrently; d) generating by a second controller in the first slave wireless node a third message for transmission to the master wireless node; and e) transmitting by a second transceiver in the first slave wireless node a preamble to the master wireless node followed immediately by the third message using the first allotment of sub-carriers; and f) the transmission of the preamble further comprises transmitting by the second transceiver in the first slave wireless node the preamble including a first predetermined sequence of symbols followed immediately with no delay by a repetition of the first predetermined sequence of symbols and a second predetermined sequence of symbols having a low correlation to the first predetermined sequence of symbols, the preamble including the low correlation second predetermined sequence of symbols immediately followed by the first predetermined sequence and its repetition; and g) the master wireless node receiving the preamble and correlating the received predetermined sequences (504; 512) to identify a drop in correlation of a cross-correlation with a low correlation value of the second predetermined sequence relative to the first predetermined sequences and an auto-correlation with a high correlation value of the first predetermined sequence with itself, the low correlation value (e.g. -1) being smaller than the high correlation value (e.g. 1). a) generating by a first controller in a master wireless node a first allotment of sub-carriers (120; 220) selected from a predetermined frequency band for communication with a first slave wireless node (108, 112, 116), the first allotment of sub-carriers including at least two orthogonal sub-carriers; b) generating by the first controller in the master wireless node a second allotment of sub-carriers selected from the predetermined frequency band for communication with a second slave wireless node (108, 112, 116), the second allotment of sub-carriers including at least two orthogonal sub-carriers that are different than the at least two orthogonal sub-carriers in the first allotment of sub-carriers (120; 220); c) transmitting by a first transceiver in the master wireless node a first message to the first slave wireless node using only the first allotment of sub-carriers and a second message to the second slave wireless node using only the second allotment of sub-carriers, the first message being different than the second message and the transmission of the first message and the second message occurring concurrently; d) generating by a second controller in the first slave wireless node a third message for transmission to the master wireless node; and e) transmitting by a second transceiver in the first slave wireless node a preamble to the master wireless node followed immediately by the third message using the first allotment of sub-carriers; and f) the transmission of the preamble further comprises transmitting by the second transceiver in the first slave wireless node the preamble including a first predetermined sequence of symbols followed immediately with no delay by a repetition of the first predetermined sequence of symbols and a second predetermined sequence of symbols having a low correlation to the first predetermined sequence of symbols, the preamble including the low correlation second predetermined sequence of symbols immediately followed by the first predetermined sequence and its repetition; and g) the master wireless node receiving the preamble and correlating the received predetermined sequences (504; 512) to identify a drop in correlation of a cross-correlation with a low correlation value of the second predetermined sequence relative to the first predetermined sequences and an auto-correlation with a high correlation value of the first predetermined sequence with itself, the low correlation value (e.g. -1) being smaller than the high correlation value (e.g. 1).