An Efficient and Optimal Detector for Orthogonal Precoding in DFT-based Systems

In this paper, we propose a novel efficient implementation of the optimal detector based on the minimum-mean-square-error criterion for orthogonally precoded orthogonal frequency-division multiplexing (OP-OFDM) systems. It enables the OP-OFDM to compensate for data rate loss reported in previous work with a reasonable receiver complexity. Numerical experiments show the proposed detector achieves outstanding error rate and throughput performances, and reduces the computational complexity by roughly 95 % from the conventional implementation in practical contexts where the OP-OFDM systems satisfy a strict spectral mask of 55 dB at band-edges.