NOFDM System Based on Circular Conjugate Symmetry Properties of DFT

Based on circular conjugate symmetry properties (CCSP) of discrete Fourier transform (DFT), a novel approach to nonorthogonal frequency division multiplexing (NOFDM) is presented. Different from other NOFDM systems, a simple estimation algorithm is exploited in the receiver instead of maximum likelihood sequence detection (MLSD) while the bit error rate (BER) of the proposed system is similar to those of other NOFDM systems in terms of the same bandwidth efficiency. We describe the proposed system model and derive the estimation algorithm. Simulation results show that the presented NOFDM system has both higher bandwidth efficiency and better BER performance than standard orthogonal frequency division multiplexing (OFDM) when the derived estimation algorithm is adopted.