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Building the physical (PHY) layer of an OFDM modem that works over audio. OFDM is used in WiFI, 5G, digital TV, and a host of other radio communincation.

OFDM is a method for digital communications using a frequency multiplexing scheme that uses multiple sub-carriers to transmit several symbols of data in parallel. Each sub-carrier can use a common modulation scheme such as quadrature amplitude modulation or phase shift keying. The advantages of OFDM lies in its straight-forward channel equalization scheme, easy elimination of inter-symbol interference, and efficient implementation via the FFT.

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