- 學位論文
降低DRM帶外功率之改善研究
FURTHER STUDY ON REDUCTION OF OUT-OF-BAND POWER EMISSION IN DRM
摘要
中文摘要 現代通訊產業的快速成長，亦助長音訊數位廣播的大幅成長。世界音訊廣播 (Digital Radio Mondiale: DRM)是全新的數位調幅廣播標準為ETSI ES 201 908。而新技術在無線頻帶的使用效率，同時造成頻帶干擾衝突的急迫性問題更加嚴重。 近來的研究，降低OFDM帶外頻譜功率的方法，有一個有趣的議題，對原系統加入額外資料的載波，來提高的頻寬的使用率，改善降低對鄰近頻帶的干擾，解決此項問題，在世界音訊廣播系統，使用議題為：強迫零法及和尾隨法均能改善降低對鄰近頻帶的干擾，有不錯的改善。在這篇論文裏，因此我們提議使用組合這兩種技術（強迫零法及和尾隨法）並運用不同的門檻，即先強迫零法後尾隨法或先強迫零法後尾隨法，依據我們模擬的結果，我們提議的組合這兩種方法與各別的方法（強迫零法或尾隨法）相比，組合法能大大地改善，降低OFDM帶外頻譜功率。
並列摘要
ABSTRACT The fast growing up of modern communication also contributes great improvement of audio digital broadcasting. Digital radio Mondiale (DRM)， is a newly proposed standard for digital broadcasting in AM known as ETSI ES 201 908. Meanwhile，the effective use of radio frequency of new technology implies the urgent requirement of robustness to neighborhood interference. Recent researches on the reduction of out-of band radiation for OFDM-based technology have becoming a interesting topics by using the auxiliary carrier to achieve compatibility to original system. Zero-forcing and Tail-tracking have been proposed to reduce out-of band interference for DRM effectively. In this thesis，we are dedicated to study the combination of both technologies with different threshold. From simulation result, we found that， the combination of both approaches can achieve great improvement on the reduction of out-of-band radiation in DRM， in comparison of original proposals.