Method for robust real-time wireless industrial communication

A wireless communication system comprising:

• a first slave wireless node;
• a second slave wireless node;
• and
• a master wireless node, the master wireless node comprising:
• a first transceiver configured to transmit data to the first slave wireless node and the second slave wireless node and receive data from the first slave wireless node and the second slave wireless node;
• and
• a first controller operatively connected to the first transceiver, the first controller being configured to:
• generate a first allotment of sub-carriers selected from a predetermined frequency band for communication with the first slave wireless node, the first allotment of sub-carriers including at least two orthogonal sub-carriers;
• generate a second of allotment of sub-carriers selected from the predetermined frequency band for communication with the second slave wireless node, 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;
• and
• transmit 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 substantially simultaneously;
• and
• the first slave wireless node further comprising:
• a second transceiver configured to transmit data to the master wireless node and receive data from the master wireless node;
• and
• a second controller operatively connected to the second transceiver, the second controller being configured to:
• generate a third message for transmission to the master wireless node;
• and
• transmit a preamble to the master wireless node followed immediately by the third message using the first allotment of sub-carriers, the preamble including a first predetermined sequence of symbols, 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.