Phase Noise Resilient Three-Level Continuous-Phase Modulation for DFT-Spread OFDM

In this paper, a novel waveform with low peak-to-average power ratio (PAPR) and high robustness against phase noise (PN) is presented. It follows the discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) signal model. This scheme, called 3MSK, inspired by continuous-phase shift keying (CPFSK), but it uses three frequencies in baseband model – specifically, 0 $\pm f_{symbol}/4$ , where notation="LaTeX">$f_{symbol}$ symbol rate which effectively constrains transitions between consecutive symbols to \pi /2$ rad. Motivated controlled of modulation, different degrees continuity can be achieved, allowing reduce out-of-band (OOB) emissions transmitted signal, while supporting receiver processing complexity. Furthermore, characteristics are improved generating an initial time-domain constant envelope at higher than rate. helps reach smooth 3MSK symbols, information encoded transitions. Also possibility using excess bandwidth investigated transmitting additional non-zero bins outside active basic DFT-s-OFDM model, provides capability greatly PAPR. The most critical tradeoffs oversampled schemes that PAPR achieved cost somewhat reduced link performance and, case band, also spectrum efficiency reduced. Due fact transitions, tracks variations without needing reference signals developed. To end, shown new modulation well-suited for non-coherent receivers, even under strong conditions, thus overhead signals. Evaluations physical-layer scheme performed terms transmitter metrics such as PAPR, OOB achievable output after amplifier (PA), practical PA Finally, coded radio evaluations provided, demonstrating has similar bit error (BER) traditional quadrature phase-shift (QPSK), significantly lower power, receivers.