Performance of H.26L video coding with OFDM-CDMA for 4G mobile communication systems | |
| Author | Nguyen Hoai Nga |
| Call Number | AIT Thesis no.TC-02-07 |
| Subject(s) | Video compression Mobile communication systems Code division multiple access Coding theory |
| Note | A thesis submitted in pa1tial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. TC-02-07 |
| Abstract | Among the new services, video transmission will be a major application in the up coming 3G and 4G systems and may be a key factor in their success. On the other hand, video communications requires very much bandwidth in comparison with other information types such as text and data. Thus, to adapt with the bandwidth-limited channels, especially wireless channels, video source must be compressed significantly. A new video coding standard namely H.26L is being developed by Joint Video Team (JVT) which is the cooperation between two organizations: ITU-T VCEG and ISO/ICE. The main strong point of H.26L compared with the previous standards is it can save up to 50% bit rate. Another feature is the Network Adaption Layer designed for delivering the data over variety of networks. However such high compression ratio also means to the error vulnerability. As a result, H.26L coded video data are extremely sensitive to the channel errors, so additional protection schemes must be incorporated. In this thesis, it is compared the performance of H.26L and H.263 coding in A WGN channel. The results showed that performance of H.26L at low SNR is not as good as at high SNR in comparison with the H.263 standard; but in general, the picture qualities is better than the H.263 decoded pictures at the same compression ratio. Further, it is investigated the performance of this newly designed standard in the frequency selective fading channel. As OFDM-CDMA is one potential nominee for the next generation wireless systems, it has been chosen for the simulation model. It is obvious that video transmission in this intense changing environment is a demanding task. It is thus necessary to apply good error correcting code to protect the compressed video. Turbo code is a proper choice as this code offered very good protection for an acceptable complexity and outperforms all classical coding schemes in terms of performance. This code has been used in the third generation mobile systems. It has been shown in the simulation that the exposure attribute to the high error environment of H.26L coded pictures has been reduced significantly. In this thesis work, ARQ scheme is paid much attention as it has been shown to be more effective than FEC in wireless video transmission. The Hybrid-type II ARQ in combination with Turbo coding has improved the BER performance of the system considerably and therefore increased the quality and the number of received pictures. It also should be emphasized that the feedback protocols must be designed in a way that minimizes both errors and time delays. |
| Year | 2002 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-02-07 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Fernando, W. A. C. ; |
| Examination Committee(s) | Ahmed, Kazi M. ;Erke, Tapio J.; |
| Scholarship Donor(s) | Government of Finland; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2002 |