DVB-H 系統的傳輸效能模擬

手提式數位無線廣播電視 ( DVB-H ) 是以地面數位無線廣播電視 ( DVB-T )為基礎下，專門為手提式裝置如手機、PDA或Smart Phone等所設計之系統。此二系統在行動接收方面都會因傳輸通道的快速改變而有所影響。為了能達到較高的移動速度，現有的地面數位無線廣播電視系統都會利用雙接收天線或較複雜之信號處理方式來做為解決方案。但是手提式數位無線廣播電視系統主要是設計給以電池為電源的小螢幕接收機使用。它必需能達到不管在室內、室外或是行動接收的環境下，都能以單根接收天線來接收各種多媒體服務。在此論文中，我們利用地面數位無線廣播電視標準中所提供之錯誤修正碼，來改善所接收的信號，以達到更高的移動速度。而新的接收機架構經過最佳化後，可減少硬體複雜度。由模擬的結果可以看出，在以單根接收天線為前提下，能夠達到更高的移動速度和更小的功率需求。.

關鍵字

手提式數位無線廣播電視；正交分頻多工

並列摘要

DVB-H ( Digital Video Broadcasting-Handhelds ) dedicated for handhelds is basedon DVB-T ( Digital Video Broadcasting-Terrestrial ). Mobile receptions of both systemsare significantly affected by the fast changing transmission channel. For the purpose ofachieving higher speeds, most of the current solutions for DVB-T propose to use twoantennas at the receiver and a more elaborate signal processing for the channelestimation. But the essential commercial requirements of DVB-H were found to be abattery-powered mobile terminal with a small screen. It should be able to receivemultimedia services using a single antenna in the portable, mobile and indoorenvironments. In this thesis, we exploit the error correction capabilities provided by the channel coding of the DVB-T standard to improve the reliability of the received signals for the purpose of increasing the maximum tolerable doppler frequency. The building blocks of the new structure have been optimized in order to reduce the complexity. Simulations show that the use of the new structure with single antenna yields a better improvement in terms of the maximum tolerable speed and the minimum required SNR.

並列關鍵字

DVB-H ； DVB-T ； OFDM ； MPE-FEC ； QEF ； QEFIP ； 2d

參考文獻

[9] Pei-Yun Tsai and Tzi-Dar Chiueh, Frequency-Domain Interpolation-Based Channel

[6] Frieder Sanzi and Joachim Speidel, An Adaptive Two-Dimensional Channel

Services, Transmission Aspects

Modulation for Digital Terrestrial Television

[4] ETSI EN 302 304 V1.1.1 ( 2004-06 ), Transmission System for Handheld Terminals

國際替代計量

DVB-H 系統的傳輸效能模擬

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