Title :
Robust wireless image transmission using jointly-optimized modulation and source coding
Author :
Doufexi, Angela ; Nix, Andrew ; Bull, David
Author_Institution :
Centre for Commun. Res., Bristol Univ., UK
Abstract :
An orthogonal frequency division multiplexing (OFDM) system is an effective technique for high data rate transmission over wideband multipath fading channels. A robust image transmission system is proposed, based on a Reed-Solomon (RS) coded 16-QAM OFDM scheme. This system comprises a vector quantization (VQ) source encoder with a compression rate of 16. The data is encoded using a Reed-Solomon block code and mapped onto a 16-QAM constellation. The parameters of the codebook have been optimized for 16-QAM. It is shown, through simulations, that the combination of OFDM and Reed-Solomon coding makes the system robust to errors. Results indicate that the joint optimization of source coding and QAM minimizes the visual artifacts that result from channel induced errors
Keywords :
OFDM modulation; Reed-Solomon codes; block codes; fading channels; image coding; modulation coding; multipath channels; optimisation; quadrature amplitude modulation; radiocommunication; source coding; vector quantisation; visual communication; 16-QAM constellation; BER; OFDM system; PSNR; RS coded 16-QAM OFDM; Reed-Solomon block code; VQ; VQ coded image; channel induced errors; codebook parameters; compression rate; high data rate transmission; jointly-optimized modulation; orthogonal frequency division multiplexing; robust wireless image transmission; simulations; source coding; source encoder; vector quantization; visual artifacts minimization; wideband multipath fading channels; Block codes; Fading; Image coding; Image communication; OFDM; Reed-Solomon codes; Robustness; Source coding; Vector quantization; Wideband;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851630
