- 學位論文
數位無線地面電視台視和民視單頻網路之量測與分析
Performance evaluations on digital TTV and FTV single frequency networks
摘要
本論文主要是分別針對TTV台視和FTV民視已經建置完成的發射站，評估其兩個單頻網路之特性。共有六個發射站提供測試信號，它們是建置在台北竹子山、桃園龍潭、三義火炎山、南投鳳鳴、台南白河枕頭山和高雄中寮等，均位於台灣西部地區。評估是在二條高速公路（1號和3號）的北部進行，量測包括行動接收與固定點接收，固定點量測接收在高速公路鄰近交流道進行，並記錄電場強度和誤碼率，量測到的信號也將客觀的分類成為3種等級。 根據量測的結果，台視和民視二者在一高或是二高之北部，其實相差不多，然而在南部地區，台視和民視二者就有較明顯的差距。台視在南部收訊不良地區呈現零星分佈，品質在可接收範圍。但是我們發現民視網路在台南和高雄地區，有些路段呈現中斷訊號好幾公里，由量測地圖的路線上可看出嚴重中斷，而台視在南部收訊不良地區呈現零星分部，品質在可接收範圍。
並列摘要
This thesis evaluates performances of two DVB-T single frequency networks, deployed by TTV and the FTV stations respectively. Totally, there are six transmitters to provide test signals. They are located at bamboo mountain in Taipei, Lungtan area in Tayou, Inflammation mountain in Maouli, Phoenix area in Nantou, Pillow mountain in Tainan, and Chungliau in Kaoshung, all are in the western part of Taiwan .The evaluations were carried out in northern part of two freeways (No.1 and No.3 ). The tests covered the mobile and fixed-point receptions. The fixed-point tests were carried out at the exits on the freeway. Field strengths along with bit erroe rates were recorded. We also measured the impulse responses to evaluate the multi-path effects. The received signals were also objectively classified into three grade levels. Based on measured results, both single frequency networks are compatible to eath other on the northern part of Taiwan. However, there are some differences on the southern part of it .It was found that the reception failed for several kilometers in Tainan and Kaoshung for FTV network. The displayed picture was very poor in those routes. However, the reception signal of TTV network can keep on an acceptable level. Only a few interrupted signals were observed.