手持式數位視訊廣播系統DVB-H之傳輸技術性能分析

Performance Analyses on DVB-H Transmission Technology

黃冠傑(Kuan-Chieh Huang)

指導教授 ： 祁忠勇 ； 黃建華

國立清華大學/電機資訊學院/通訊工程研究所/碩士(2006年)

摘要

歐洲數位視訊廣播技術發展組織（Digital Video Broadcasting Project；DVB）所提出之手持式數位視訊廣播（DVB-Handheld；DVB-H）技術規格已於2004年11月成為歐洲電信標準學會（European Telecommunication Standards Institute；ETSI）之標準。相較於傳統固定與可攜式終端裝置上的應用，應用於手持式裝置之傳輸技術需面對較嚴苛的環境限制與性能要求。且為了兼顧與地面數位視訊廣播（DVB-Terrestrial；DVB-T）之向後相容性，DVB-H之發展策略是基於DVB-T之實體層（Physical Layer）新增4K Mode，並在資料鏈結層（Data-Link Layer）中增加時間切片傳輸（Time-Slicing）、多重協定封裝-前向糾錯機制（Multi-Protocol Encapsulation – Forward Error Correction；MPE-FEC）兩項關鍵技術，來降低接收裝置之功率消耗與提高行動接收的穩定度。此外亦規範其網路層（Network Layer）資料必須符合網際網路協定（Internet Protocol；IP）封包格式，且增修傳輸參數訊息（Transmission Parameter Signaling；TPS）規範以攜帶DVB-H服務模式下的相關參數。除了在功耗與行動接收上得到了解決方案之外，DVB-H還提供了無縫網路交接（Handover）和易與異質網路結合的特性。目前全球在行動電視上有四個開放式的新興標準：歐規的DVB-H、韓規的DMB、日規的ISDB-T與Qualcomm公司所提出的MediaFLO技術，預期DVB-H未來將會脫穎而出成為世界主流技術。
本論文首先介紹DVB-H的發展沿革與系統概念，以及詳細說明DVB-T/H的實體層內容以及彼此之間的變革過程。接著深入探討資料鏈結層中的兩項關鍵技術：Time-Slicing、MPE-FEC，並對這兩協定層之中各項參數之於系統性能的影響做理論上的分析。同時，一種創新的解碼方法也在此被提出而用以改善MPE-FEC解碼效能。最後則藉由電腦模擬驗證分析結果與比較所提解碼改良方法之效能，且依此對於DVB-H系統傳輸參數的選擇提出數組策略建議。

關鍵字

數位視訊廣播 ； 手持式數位視訊廣播 ； 數據資料廣播 ； 時間切片 ； 多重協定封裝-前向糾錯 ； 里德-所羅門更正碼 ； 行動電視

並列摘要

The specification of Digital Video Broadcasting-Handheld（DVB-H）developed by the European DVB Project has become European Telecommunications Standards Institute（ETSI）standard since Nov. 2004. Compared with the conventional applications in fixed or portable terminals, transmission technology applied to handheld terminals has to satisfy more stringent requirements and environmental limitations. To consider the backwards compatibility with DVB-T（Terrestrial）, DVB-H adds 4K mode and some extended Transmission Parameter Signaling（TPS）on Physical Layer defined by DVB-T. To lower power consumption of receiver and to enhance mobility, DVB-H also utilizes two key technologies, Time-Slicing and MPE-FEC, on Data-Link Layer. Moreover, DVB-H stipulates that the form of datagrams from Network Layer must be accordance to that of Internet Protocol（IP）. In addition to solve problems regarding power consumption and mobile reception, DVB-H even provides functions of soft-handover and accommodates with other networks. There are four emerging mobile-TV standards in the world presently. They are DVB-H from Europe, DMB from Korea, ISDB-T from Japan and MediaFLO, which is developed by Qualcomm. It is predictable that DVB-H will be the mainstream in the future.
In this thesis, the development background and system concept of DVB-H will be introduced first. The contents of Physical Layer on DVB-T and DVB-H will also be explained clearly. And then, the technologies of Data-Link Layer, Time-Slicing and MPE-FEC, are going to be discussed along with the analyses about the relationship between various parameters and reception performance. Simultaneously, a novel decoding approach is proposed to improve the MPE-FEC decoding efficiency. Some simulation results are provided to verify the analysis results and the efficacy of the proposed MPE-FEC iterative decoding approach as my conclusion. Last but not least, we will recommend four strategies on how to select DVB-H system parameters based on the above findings.

並列關鍵字

Digital Video Broadcasting ； DVB ； Digital Video Broadcasting-Handheld ； DVB-H ； Internet Protocol-datacast ； IP-datacast ； Time-slicing ； Multi-Protocol Encapsulation-Forward Error Correction ； MPE-FEC ； Reed-Solomon Code ； Mobile TV

參考文獻

[9]C.-Y. Kao and C.-Y. Chen,“On handheld DTV: An introduction to DVB-H technology,”CCL Technical Journal, pp. 5-17, Dec. 2004.

[15]洪永華,“數位電視地面廣播標準簡介,”ITIS 產業資訊, Apr. 2004.

(DVB); DVB specification for data broadcasting,”Nov. 2004.

[11]M. Kornfeld and U. Reimers,“DVB-H – the emerging standard for mobile data communication,”EBU TECHNICAL REVIEW, Jan. 2005.

[1]ETSI EN 300 744 v1.5.1,“Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television,”Nov. 2004.