Efficient Image Transmission over OFDM- and MC-CDMA-Based Systems
AND MC-CDMA-BASED SYSTEMS · 2015
This chapter proposes a new approach for efficient image transmission over systems based on multi-carrier orthogonal frequency division multiplexing (MC-OFDM) and multi-carrier code division multiple access (MC-CDMA) using chaotic interleaving. The chaotic interleaving scheme based on the Baker map is applied on the image data prior to transmission. The proposed approach transmits images over wireless channels efficiently without posing significant constraints on the wireless communication system bandwidth and noise. The performance of the proposed approach is further improved by applying frequency domain equalization (FDE) at receiver. Two types of frequency domain equalizers are considered and compared for performance evaluation of the proposed systems: the zero forcing (ZF) equalizer and the linear minimum mean square error (LMMSE) equalizer. Several experiments are carried out to test the performance of the image transmission with different sizes over the OFDM and MC-CDMA based systems. Simulation results show that image transmission over wireless channels using the proposed chaotic interleaving approach is much more immune to noise and fading. In addition, this chaotic interleaving process adds a degree of encryption to the transmitted data. The results also show a noticeable performance improvement in terms of root-mean-square error (RMSE) and peak signal-to-noise ratio (PSNR) values when applying FDE to the proposed approach, especially LMMSE equalizer.