A joint channel estimation and unequal error protection scheme for video transmission in OFDM systems

被引：0
|
作者：
Sun, Y [1 ]
Wang, XW [1 ]
Liu, KJR [1 ]
机构：
[1] Univ Maryland, Dept Elect & Comp Engn, College Pk, MD 20742 USA
来源：
2002 INTERNATIONAL CONFERENCE ON IMAGE PROCESSING, VOL I, PROCEEDINGS | 2002年
关键词：
D O I：
暂无
中图分类号：
TP18 [人工智能理论];
学科分类号：
081104 ; 0812 ; 0835 ; 1405 ;
摘要：
OFDM modulation, which has been adopted by the Digital Broadcasting (DVB-T) standard in Europe, has been recognized for its good performance for high data rate wireless communications. Therefore, the study of the robust transmission of multimedia data over the OFDM systems has attracted extensive research interest. In the past, channel estimation, which is an important aspect in OFDM systems, has not been exploited for multimedia transmission. When using the block-training based channel estimation schemes, there exists a periodic variation of the error rates due to the channel estimation imprecision. We use this property to provide unequal error protection(UEP) for the video transmission. Compared with systems using pilot-training based channel estimation schemes, which are recommended in the DVB-T standard, a performance gain of about 2dB in the PSNR of the reconstructed images is achieved.
引用
收藏
页码：549 / 552
页数：4
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