SEFDM-signals Euclidean Distance Analysis

Spectrally efficient frequency division multiplexing (SEFDM) is considered from the Euclidean distance point of view. The simulations are performed for QPSK modulated subcarriers with different bandwidth compression factor values (0.5, 0.75 and 1) in the presence and absence of average power equalization. It is shown that SEFDM N-dimensional points have a few very close interfering points for medium compression factors. Thus, a special rule can be used to choose particular $N$-dimensional points to increase BER performance of SEFDM. The proposed results are useful for SEFDM coded modulation schemes development where non-informational subcarriers are chosen in the same way as in block error correction schemes.