Scalable multiuser audio system and method

An apparatus for multi-user audio monitoring, the apparatus comprising:

• a processor;
• and
• a memory storing instructions that, when executed by the processor, cause the apparatus to:
• subdivide a frequency-time domain of a carrier wave in a radio frequency band into a plurality of sub-carrier allocations associated with a plurality of in-ear monitors (IEMs), wherein respective sub-carrier allocations are orthogonal in a frequency-time domain to other sub-carrier allocations of the plurality of sub-carrier allocations;
• modulate the plurality of sub-carrier allocations according to a plurality of modulation schemes such that respective sub-carrier allocations are individually modulated;
• generate, based at least on the plurality of modulation schemes, demodulation information for demodulating the plurality of sub-carrier allocations;
• scramble the carrier wave using one or more of:
• block coding, block coding with error correction, selected mapping, convolutional encoding, selected list mapping, partial transmit sequence, interleaving, tone reservation, or tone injection;
• and
• cause transmission of the carrier wave towards one or more receivers, the carrier wave carrying the demodulation information and audio for the one or more receivers associated with one or more of the plurality of IEMs.