Performance analysis of SEFDM with optimal subcarriers spectrum shapes

In this paper we propose the technique for SEFDM modification assuming that the conventional SEFDM is a particular type of partial response signals obtained from OFDM by a denser allocation of subcarriers. Primarily, we propose a utilization of optimal pulses as shapes for subcarriers spectrums; the pulse optimization is based on the criterion of the maximal free Euclidean distance. The optimization technique was originally described for single-carrier partial response signals, hence, we use the term PR-SEFDM to distinguish proposed signals from the sinc-SEFDM. We also suggest a generation and detection algorithms for PR-SEFDM operating in frequency domain as it is usually done for OFDM. The proposed approach implies the utilization of the Viterbi algorithm for demodulation. Thus, it becomes possible to process SEFDM signals with a large number of subcarriers. In this work, we analyze the PR-SEFDM mode with controlled ISI covering eight neighboring subcarriers. It has been shown that the PR-SEFDM provides a lower bandwidth consumption with respect to the sinc-SEFDM under a fixed energy consumption and fixed computational complexity of the detection algorithm.