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008 030926s2002 th u m rtt 00| a1eng d
035 _a.b11900404
099 9 _aAIT Thesis no.TC-02-06
100 0 _aDao Ngoc Dung
245 1 0 _aChannel coding for H.264 video constant bit rate transmission over wireless channels
260 _aBangkok :
_bAsian Institute of Technology,
_c2002
300 _a71 leaves :
_bill.
490 1 _aThesis ;
_vno. TC-02-06
500 _aA thesis submitted in partial fulfillment of requirements for the degree of Master of Engineering, School of Engineering and Technology
502 _aThesis (M.Eng.) - Asian Institute of Technology, 2002
520 _aNetwork adaptation feature is left open in the previous video coding standards. Thus the quality of video sequences compressed by video codec like H.263 and MPEG family may fall dramatically when they are carried over error prone environments. This situation was well recognized and motivated the target to include the network friendliness into the H.264 on-going ITU-T video coding project. During the standard development process, new Network Abstraction Layer (NAL) concept has been defined to deals with special properties of transmission environments. Mobile channels exhibits very high bit error rate and errors tend to occur in bursts. Among measures to combat with these phenomena, forward error control (FEC) is an efficient tool. In this thesis, we have found that the turbo code with transfer function (1, 13/15)oct produced the best rate compatible punctured turbo (RCPT) codes given constraints on the characteristics of mobile wireless channels and video communications. Using the designed RCPT code, we then considered three FEC schemes in connection with H.264 NAL concept for high perfo1mance video transmission over third generation mobile channels. Three investigated FEC approaches were: equal e1rnr protection (EEP), unequal error protection (UEP) - a practical application of joint source channel coding and channel-adaptive coding (CAC). The results shown that at high SNR, EEP scheme with rate 1/2 RCPT code yielded the best performance while at low SNR, EEP scheme with rate 1/3 RCPT code improved significantly video quality compared with the other schemes. The CAC scheme was an optimized combination of EEP schemes therefore CAC is the best choice for H.264 constant bit rate video transmission. The results also shown that the current normative H.264 data partitioning approach does not provide distinguished improvements comparing with non-partitioned mode in case of constant bit rate transmission context. Thus further modification for H.264 data partitioning is required if this tool is deployed for video transmissions over 3G mobile systems.
650 0 _aVideo compression
650 0 _aCoding theory
650 0 _aWireless communication systems
700 1 _aFernando, W.A.C.,
_eChairperson
700 1 _aErke, Tapio J.,
_eExamination Committee
700 0 _aTeerapat Sanguankotchakorn,
_eExamination Committee
710 2 _aNokia Telecommunications,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. TC-02-06
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B07557
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