Due to inadequate spectrum resources and increasing demands for high quality multimedia services, traditional analog broadcasting is being migrated into digital radio around the world. This book focuses on the development of several innovative broadcasting technologies and the design of so-called Broadband Digital Radio (BDR) system, which is suitable for digital audio and data broadcasting in FM and AM channels. The new broadcasting system synergistically integrates frequency hopping, LDPC coding, hierarchical modulation and band aggregation techniques to increase the data rate, improve spectrum efficiency, and at the same time, provide the spectrum flexibility necessary in high quality audio and multimedia services.