A Dynamic Spectrum Access Scheme Based on Psychoacoustics for IBOC System
Weiwei Fang · Journal of Information and Computational Science · 2014
HD Radio standard realize a smooth transition from analog to digital broadcasting with In-band Onchannel (IBOC) technology, which is the most advantageous choice for analog broadcasting digitized. In HD Radio Hybrid waveform type, the digital signal is transmitted on both sides of the analog FM signal, and the digital signal on 130 kHz from the carrier. However, the FM bandwidth changes along with the frequency and amplitude of the baseband signal, which provide opportunities for dynamic access of digital signal. This paper utilizes the masking characteristics of the analog signal based on the psychoacoustics to allocate dynamically the spectral position of the digital signal. The purpose is to save the spectrum resources through the Dynamic Spectrum Access (DSA) of digital signal, under the premise of each frame signal has the same Noise Masking Ratio (NMR).