C33. Performance evaluation of chaotic interleaving with FFT and DWT OFDM

Abstract

This paper presents a new interleaving scheme for efficient data transmission with Orthogonal Frequency Division Multiplexing (OFDM) over fading channels. This approach is based on the chaotic Baker map. The binary data is interleaved with the proposed approach prior to the modulation step. In addition to reducing the channel effects on the transmitted data, the proposed chaotic interleaving approach adds a degree of encryption to the transmitted data. The performance of the proposed approach is tested on the Discrete Wavelet Transform OFDM (DWT-OFDM) and the conventional Fast Fourier Transform OFDM (FFT-OFDM) with and without chaotic interleaving. The proposed system comprises Frequency-Domain Equalization (FDE) to obtain high diversity gains over frequency selective multi-path fading channels. The simulation results show that the DWT-OFDM system implementing the new interleaving scheme provides better Bit Error Rate (BER) performance than the FFT-OFDM system.