數位廣播緣起於 90 年代初期歐洲一項所謂的 Eureka-147 數位音訊廣播計畫,所採用的多重載波編碼正交分頻多工之傳輸技術,非常適合於行動接收,同時於多重路徑干擾的傳輸通道中,依然能提供非常好的抗干擾特性。另外,數位廣播可於單頻網路中實現,大大提高了頻道使用的效率。除了利用MPEG-Audio Layer II之音源壓縮技術,提供媲美 CD 音質的數位音訊廣播服務外,還可同時提供與音樂節目相關的背景資料與相關訊息,及一些獨立的文字、資料服務之廣播傳輸,例如交通旅遊資訊、天氣報告、傳呼、緊急危難警告及圖片、影像的傳輸廣播服務。利用多工的廣播傳輸網路提供了非常彈性的節目內容組合。 本論文使用MATLAB-Simulink之軟體以及其內建之元件庫建構出DAB系統傳輸平台,依據歐規Eureka-147 系統之規格設定此平台內每一個子系統進行模擬使用MATLAB模擬符合Eureka-147規格之數位音訊廣播系統,這可作為實際上用儀器測量的驗證標準及提供日後發展DAB數位音訊廣播系統測試參考。系統量測藉由R&S ETL接收寶島新聲廣播電台(頻率為 BandⅢ 213.360 MHz)及R&S SFU DAB訊號得到驗證。
DAB was initially developed in the 1990s by the Eureka-147/ DAB project. It employed a multi-carrier coded orthogonal frequency division multiplexing (COFDM) transmission scheme that is especially suitable for mobile reception and provides very high robustness against multi-path effect. It allows to use of single frequency networks (SFNs) for high frequency efficiency. In addition, comparing to CD-like digital audio services via MPEG-Layer Ⅱ compression technology, DAB is capable of transmitting program-associated data (PAD) and a multiplex of data services (e.g. traffic and travel information, weather report, paging, emergency warning, still and moving pictures, etc.). In this thesis, MATLAB-Simulink is used to build and simulate the DAB transceiver system corresponding to Eureka-147 specification. The DAB system developed by simulink offers a test reference example to actual instrumentation measurement. Finally, a real-time signal from SuperFM (Frequency Band III 213.360MHz) is measured with R&S SFU and ETL.