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Optimal pulses and M BCJR demodulation algorithm to outperform the OFDM spectral efficiency

DOI 10.18127/j00338486-201812-12

Keywords:

Nguyen Van Phe – Post-graduate Student, Higher School of Applied Physics and Space Technologies of Peter The Great St. Petersburg Polytechnic University
E-mail: nvphe1905@gmail.com
A.L. Gelgor – Ph.D.(Eng.), Associate Professor, Higher School of Applied Physics and Space Technologies of Peter The Great St. Petersburg Polytechnic University
E-mail: а_пelgor@mail.ru
Nguyen Tan Hoang Phuoc – Post-graduate Student, Higher School of Applied Physics and Space Technologies of Peter The Great St. Petersburg Polytechnic University
E-mail: hoangphuoc1704@yahoo.com


In this work, we compared spectral efficiency between reputed SEFDM signals, and recently proposed RRC-SEFDM and PR-SEFDM signals, all of them are different types of the signals with non-orthogonal frequency division multiplexing. All signals were modulated with QPSK and 16-QAM signal constellations. Demodulation was performed by suboptimal algorithm M BCJR with M = 8 paths survived at each step. For PR-SEFDM signals construction we used optimal spectral pulses with L = 12 taps. The simulation results were shown that, at first, the maximum gain in spectral efficiency is achieved only with simultaneous introducing intersymbol interference and increasing size of signal constellation. At second, PR-SEFDM signals with optimal spectral pulses provide a significant gain with respect to SEFDM signals and RRC-SEFDM signals at fixed energy consumptions and fixed complexity of the demodulation algorithm. In addition, we made comparison of PR-SEFDM and OFDM signals spectral efficiency. In this case, PR-SEFDM signals provide up to 27% gain in spectral effi-ciency for QPSK and 16-QAM signal constellations with additionally expenses up to 0.6 and 1.3 dB respectively.

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