A sliding and variable window based multitone excision for digital audio broadcasting

This study considers the transmission of digital signals in-band on-channel for application in digital audio broadcasting (DAB). In the FM-channel used for analog transmission, two different DAB scenarios are simulated. In the first approach, the digital data is spread in form of a weak direct sequence spread spectrum (DSSS) signal underneath the FM. Since the FM signal is a multitone interference to the DSSS signal, it is to be excised. In this paper, a new adaptive frequency domain technique is proposed for excising multitone interference in DAB, The second scenario performs an amplitude modulation on the FM signal. This technique assures no interference in-between the new, digital, and the already existing analog service,