Efficient modulation scheme for OFDM system with ZP and MMSE equalizer

The modulation scheme for orthogonal frequency division multiplexing (OFDM) is constantly being developed either to explore the channel diversity or reduce the peak-to-average power ratio (PAPR) of the OFDM signal. This paper presents a new, very low complexity OFDM system, using a single unitary X-transform with zero-padding (ZP) and minimum mean-square error (MMSE) equalizer. Mathematical development supported by simulation results showed that, over multipath channels, the proposed ZP-X-OFDM scheme is better than the conventional ZP-OFDM. Moreover, the proposed system significantly reduces the transceiver complexity of the OFDM system and improves the bit-error-rate (BER) and the PAPR of the OFDM signal significantly.