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

Author

Sun, Yan ; Pandana, Charles ; Wang, Xiaowen ; Liu, K.J.R.

Author_Institution

Dept. of Electr. & Comput. Eng., Maryland Univ., College Park, MD, USA

fYear

2002

fDate

9-11 Dec. 2002

Firstpage

380

Lastpage

383

Abstract

Orthogonal frequency division multiplexing (OFDM) modulation, adopted by the digital video broadcasting (DVB-T) standard, has been recognized for its good performance for high data rate wireless communications. Therefore, the study of the robust transmission of multimedia data over OFDM systems has attracted extensive research interests. 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, OFDM data blocks experience unequal decoding error rate due to the imprecision of channel estimation. We use this property to provide unequal error protection (UEP) for transmission of SPIHT coded images. Compared with the systems using pilot training channel estimation schemes, which are recommended in the DVB-T standard, the proposed scheme improves the PSNR of reconstructed images by up to 2 dB.

Keywords

OFDM modulation; channel estimation; error correction codes; image coding; multimedia communication; DVB; DVB-T; SPIHT coded image; decoding error rate; digital video broadcasting; high data rate wireless communication; image transmission; joint channel estimation; multimedia data; orthogonal frequency division multiplexing modulation; robust transmission; unequal error protection scheme; wireless OFDM system; Channel estimation; Communication standards; Digital modulation; Digital video broadcasting; Error correction codes; Image communication; Multimedia systems; OFDM modulation; Robustness; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Multimedia Signal Processing, 2002 IEEE Workshop on

Print_ISBN

0-7803-7713-3

Type

conf

DOI

10.1109/MMSP.2002.1203325

Filename

1203325