Research And Realization On DAB Synchronization Techniques

In this paper, we first introduce the history and development of digital audio broadcasting and present a design and implementation of synchronization for OFDM(orthogonal frequency-division multiplexing) system based on Eureka 147DAB standard. We describe the synchronization technique in several keys including symbol timing, carrier frequency offset estimation and sampling clock offset estimation. For symbol timing synchronization techniques, we first study the interference caused by coarse symbol timing offset and fine symbol timing offset, furthermore, analyze some typical algorithms. After indicated their deficient, a new algorithms for Eurekal47DAB are presented. For carrier frequency offset synchronization techniques, some effect caused by fine carrier frequency offset and integer carrier frequency offset have been pointed out through simulation and analysis, and a new fine carrier recovery algorithm is proposed. For sampling clock synchronization, the effects of sampling clock offset on system performance are analyzed with computer simulation results, and the traditional sampling clock synchronization algorithms is expatiated. Above all, through a comprehensive description and Matlab simulation, this paper introduces a whole synchronization scheme suit for Eurekal47DAB, and discusses the hardware actualizing with DSP on general hardware platforms.