Information Technology Reference
In-Depth Information
8 Conclusions
We have proposed a novel cross-layer optimization scheme for wireless video
transmission over MIMO-OFDM channels. The scalable extension of H.264 is
used for source coding and the compressed video is divided into scalable layers.
For each of these scalable layers, the cross-layer optimization scheme determines
the quantization parameter, channel coding rate, and symbol constellation. In
order to carry out the optimization, an accurate estimation of the expected video
distortion at the receiver is required. We have developed two expected distortion
estimation methods, the Temporal-SNR SDDE method and the SNR-Temporal
SDDE method. These methods differ in the priority order in which temporal and
SNR scalability are considered. We have also proposed two different priority map-
pings of the scalable layers, the Temporal-SNR mapping and the SNR-Temporal
mapping. We have presented experimental results that show the outcome of the
cross-layer optimization using both distortion estimation methods. The SNR-
Temporal mapping performs better for high-motion video sequences, while the
Temporal-SNR mapping performs better for low-motion video sequences.
References
1. Wang, H., Kondi, L.P., Luthra, A., Ci, S.: 4G Wireless Video Communications.
John Wiley and Sons, Ltd., Chichester (2009)
2. Alamouti, S.M.: A simple transmit diversity technique for wireless communications.
IEEE Journal on Selected Areas in Communications 16(8), 1451-1458 (1998)
3. Tarokh, V., Seshadri, N., Calderbank, A.R.: Space-time block codes from orthog-
onal designs. IEEE Transactions on Information Theory 45(5), 1456-1467 (1999)
4. Zheng, H., Liu, K.J.R.: Robust image and video tansmission over spectrally shaped
channels using multicanier modulation. IEEE Transactions on Multimedia (March
1999)
5. Kuo, C., Kim, C., Kuo, C.C.J.: Robust video tansmission over wideband wireless
channel using space-time coded OFDM systems. In: Proc. WCNC, vol. 2 (March
2002)
6. Zhang, H., Xia, X.-G., Zhang, Q., Zhu, W.: Precoded OFDM with adaptive vector
channel allocation for scalable video transmission over frequency-selective fading
channels. IEEE Trans. Mobile Computing 1(2) (June 2002)
7. Kuo, C., Kim, C., Kuo, C.-C.J.: Robust video transmission over wideband wireless
channel using space-time coded OFDM systems. In: Proc. IEEE Wireless Comm.
and Networking Conf., WCNC 2002 (March 2002)
8. Dardari, D., Martini, M.G., Milantoni, M., Chiani, M.: MPEG-4 video transmission
in the 5Ghz band through an adaptive ofdm wireless scheme. In: Proc. 13th IEEE
Intl Symp. Personal Indoor, and Mobile Radio Comm., vol. 4 (2002)
9. Zhao, S., Xiong, Z., Wang, X.: Optimal resource allocation for wireless video over
CDMA networks. IEEE Trans. Mobile Computing 4(1) (January 2005)
10. Schwarz, H., Marpe, D., Wiegand, T.: Overview of the scalable video coding ex-
tension of the H.264/AVC standard. IEEE Transactions on Circuits and Systems
for Video Technology 17(9), 1103-1120 (2007)
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