Title :
Progressive image transmission over space-time coded OFDM systems with adaptive modulation
Author :
Sun, Yong ; Xiong, Zixiang
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
fDate :
28 Sept.-1 Oct. 2003
Abstract :
This paper considers a progressive image transmission system over wireless channels by combining joint source-channel coding (JSCC), space-time coding and orthogonal frequency division multiplexing (OFDM) and evaluate its performance. The BER performance of space-time coded OFDM is first evaluated analytically by assuming perfect channel state information at the receiver for coherent detection. Then for a given average SNR (hence BER), a fast local search algorithm is applied to optimize the unequal error protection design in JSCC. With this end-to-end system performance measurement, an adaptive modulation scheme is proposed by assigning different constellation sizes to various SNR ranges to achieve the best image quality. Simulation results confirm the effectiveness of our proposed adaptive modulation scheme.
Keywords :
OFDM modulation; adaptive modulation; combined source-channel coding; error statistics; optimisation; radio receivers; space-time codes; visual communication; BER; BER performance; SNR; adaptive modulation; bit error rate; channel state information; coherent detection; image quality; joint source-channel coding; local search algorithm; orthogonal frequency division multiplexing; performance measurement; progressive image transmission system; receiver; space-time coded OFDM system; unequal error protection; wireless channels; Adaptive systems; Bit error rate; Channel state information; Design optimization; Image coding; Image communication; Information analysis; Modulation coding; OFDM modulation; Performance analysis;
Conference_Titel :
Statistical Signal Processing, 2003 IEEE Workshop on
Print_ISBN :
0-7803-7997-7
DOI :
10.1109/SSP.2003.1289419
