Iterative decoder for coded SEFDM systems

Abstract

Spectrally efficient frequency division multiplexing (SEFDM) can offer a spectral gain in comparison with OFDM. This paper considers the framework for coded SEFDM systems with iterative decoding. We show that with block interleaving and channel coding, sequential errors in SEFDM are effectively reduced, and in turn, the decoded data can be used as feedback at the receiver to recover the orthogonality between sub-carriers. With the complementary advantages of channel coding and block interleaving, the feedback of the iterations converges within only 2–3 iterations. Simulation results show that the proposed SEFDM with iterative decoding can offer an indistinguishable performance as that of coded OFDM, while achieving a higher spectral efficiency of up to 20%.