Research of the OFDM Modulation Technology using in FM IBOC DAB System

IBOC DAB is a brand-new concept relative to Eureka-147 DAB in DAB field.At the end of 2003,FCC U.S.A.approved "in-band on-channel(IBOC)" technology as the U.S.A.digital audio broadcasting transmission criterion,it is a new development in DAB technology field.This paper presents the frame of FM IBOC DAB transmission system,the OFDM modulation characteristic of the system and realization of OFDM channel modulation system using IFFT algorithm.