The Structure and Generation of Robust Waveforms for Am in Band on Channel Digital Broadcasting

A robust In-Band On-Channel (IBOC) Digital Broadcasting system for offering improved performance over existing analog AM broadcasting has been completed by iBiquity Digital Corporation. The solution is both forward and backward compatible and does not require the allocation of additional channel spectrum. Broadcasters can simultaneously transmit both analog and digital signals within the allocated channel mask allowing full compatibility with existing analog receivers. The solution also allows broadcasters to transmit an all digital signal, replacing the hybrid analog/digital signal. This paper focuses on the generation and transmission of the AM IBOC waveform, including a description of the characteristics and features of the system.