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Low-Density Parity-Check (LDPC) Coded Framelet Transform-Based OFDM System

Framelet Transform-based OFDM (FT-OFDM) was proposed recently as an alternative to traditional Fast Fourier Transform-based OFDM (FFT-OFDM). By using the Framelet Transform, the spectral containment of the channels will be more efficient, since it does not use Cyclic Prefix (CP) that usually used in the traditional model. To improve the error rate performance of FT-OFDM, forward error correction coding is essential. This paper proposes Low-Density Parity-Check (LDPC) coded Framelet Transform-based OFDM (LDPC-FT-OFDM). The use of LDPC coding with FT-OFDM is useful in providing the desired performance at high data rates. The proposed system was tested according to two different coding rates and mapping techniques over Additive White Gaussian Noise (AWGN) and frequency-selective fading channels. The performance of the proposed system was compared to that of the uncoded FT-OFDM, LDPC-FFT-OFDM, and uncoded FFT-OFDM systems. The simulation results showed that the proposed model performs better than the three other models. Hence, the proposed LDPC-FT-OFDM system is a promising solution for high efficient data transmission over wireless channels.