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

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.