PAPR REDUCTION FOR OFDM/OQAM SIGNALS VIA ALTERNATIVE-SIGNAL METHOD

Jyothi Varaprasad, N.Padmaja

Abstract: We deemed the PAPR reduction problem for OFDM/OQAM system. The PAPR reduction is the serious problem for implementations of both OFDM and OFDM/OQAM systems due to their high PAPR. The OFDM/OQAM signal is generated by summing over M time-shifted OFDM/OQAM symbols, where the successive symbols are interdependent with each other. The AS (Alternative-Signal) method directly leads to the independent AS (AS-I) and joint AS (AS-J) algorithms. The AS-I algorithm reduces the PAPR symbol by symbol with low complexity and AS-J applies optimal joint PAPR reduction among M OFDM/OQAM symbols with much higher complexity. A sequential optimization procedure denoted AS-S have been proposed to balance the computation complexity and system performance in this paper. AS-S algorithm, which adopts a sequential optimization procedure over time with computational complexity linearly increasing with M. The Simulation results have been provided for performance comparison of AS-I, AS-J, and AS-S algorithms.

Keywords: Peak-to-Average power ratio (PAPR), orthogonal frequency division multiplexing with offset quadrature amplitude modulation (OFDM/OQAM), Alternative-signal(AS),cyclic prefix(CP)

DOI: https://doi.org/10.15623/ijret.2015.0405066