| 研究生: |
洪英釋 Hung, Ying-Shuh |
|---|---|
| 論文名稱: |
高屏地區數位電視電波傳播模擬與量測 Digital TV Radiowave Propagation Simulation and Measurement in Kaohsiung and Pingtong Area |
| 指導教授: |
蔡智明
Tsai, Chih-Ming |
| 學位類別: |
碩士 Master |
| 系所名稱: |
電機資訊學院 - 電機工程學系碩士在職專班 Department of Electrical Engineering (on the job class) |
| 論文出版年: | 2004 |
| 畢業學年度: | 92 |
| 語文別: | 中文 |
| 論文頁數: | 115 |
| 中文關鍵詞: | 數位電視 、電波傳播 |
| 外文關鍵詞: | DTV, DVB-T, COFDM, Propagation |
| 相關次數: | 點閱:64 下載:1 |
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我國數位電視採用歐規DVB-T系統,使用COFDM調變技術,具有建立SFN (Single Frequency Network)單頻網路廣播及行動接收功能。數位廣播不同於類比廣播,有所謂的「懸崖效應」(Cliff Effect),也就是接收信號低於一定電場強度數值時,就完全收不到畫面,這使得電場強度的傳播預測對數位電視廣播網的設立有相當大的影響。透過載波雜訊比C/N值,本文計算出數位電視廣播在固定、行動等接收條件下所需的電場強度值。
由於電波傳播模式是以外國的地理環境及氣候條件下所推估發展,套用於本地使用時,需靠實測來驗證其準確性,因此本文利用中視(539MHz)及華視(599MHz)在中寮的數位電視轉播站的信號,於高雄、屏東地區共做了76個點的實地量測資料。
透過德國L&S公司的 CHIRplus-BC軟體,本文使用ITUR-370、ITUR- 1546、Okumura-Hata、L&S VHF/UHF、Epstein-Peterson等傳播模式對上述實測點作電場強度模擬預測,並依此預測值與實測值的誤差,統計分析各傳播模式在平地、山區、都市、鄉村、不同頻率及不同距離等條件下的預測準確度。
The digital TV system in Taiwan is European DVB-T system, which is using COFDM modulate technology with the functions of building SFN (Single Frequency Network) broadcasting and mobile reception. Digital broadcasting is different from analog broadcasting. There is completely no reception when the reception signal value is lower than a critical field strength value, and this is so-called “Cliff Effect”. The result of “Cliff Effect” will extremely affect the prediction of field strength propagation in building digital TV broadcasting network. Through the carrier to noise ratio C/N value, this study calculates the field strength value needed under some considerable reception conditions , such as in fixed, mobile regions.
Due to the model of radiowave propagation is estimated under the conditions of geographical and climatic environments abroad, the accuracy of result needs to be proved by practical measurement when this model is used in Taiwan. Therefore, the measurement information in this study is practically collected from 76 points around the regions in Kaohsiung and Pingtong by using the signals from digital TV transmissions of China Television (CTV, 539MHz) and Chinese Television (CTS, 599MHz) in Chung-Liao.
Through the CHIRplus-BC software in Germany L&S company, this study uses the propagation models of ITUR-370、ITUR-1546、Okumura-Hata、L&S VHF/UHF and Epstein-Peterson to predict the field strength value measured from 76 points around the regions in Kaohsiung and Pingtong. Furthermore, by using the errors between the values of prediction and reality measurement, the accuracy of propagation models prediction under the different conditional regions of plain, mountain, urban, rural, different frequency and different distance will be also analyzed in this study.
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