Peak power reduction in SCS-MC-CDM system

The paper proposes a method that reduces the peak power in an SCS-MC-CDM (sub-carrier selecting multi-carrier code division multiplex) system with time domain spreading. In the proposed method, the transmitter can reduce its peak power by optimizing each sub-carrier´s phase. The method requires significantly fewer weighting factor multiplications to optimize the phase than the PTS (partial transmit sequences) method. The receiver requires no side information to regenerate the original signal. A computer simulation was carried out to estimate the proposed method´s performance. The simulation results show that the proposed method reduces the number of weighting factor multiplications to 0.002% of that required in the PTS method when the proposed method yields almost the same peak power as the PTS method.