Amplitude- and phase-modulated PSSS for wide bandwidth mixed analog-digital baseband processors in THz communication

This paper proposes modifications for the parallel sequence spread spectrum (PSSS) modulation scheme, which improve the bit error rate (BER) performance and peak-to-average power ratio (PAPR) at the same time. In our scheme, some data bits are encoded as phase shifts of the spreading sequences. Thus, the number of transmitted sequences can be reduced, and the resulting PAPR is lowered. The improvements proposed here are inspired by code shift keying (CSK) and parallel combinatory spread spectrum (PCSS) systems. The PSSS variant investigated here is based on recently discovered real-value spreading sequences, where all sequence coefficients are defined in the real domain.