A Comparative Study of Coded OFDM Systems

The performance of uncoded orthogonal frequency division multiplexing (OFDM) over fading channels is generally improved by introducing some kind of coding. Different coding schemes for OFDM has been reported in the literature. Our aim in this paper is to compare the performance of different coded OFDM systems and compare their bandwidth-complexity tradeoffs. We consider three different coded OFDM systems that employ some kind of non-redundant precoding or redundant postcoding. The comparison of these systems leads us to propose a new hybrid system that employs non-redundant precoding as well as redundant postcoding at same complexity level. Simulation results show that the hybrid system performs better than the other systems considered.