Performance Improvement in OFDM System by PAPR Reduction Using Pulse Shaping Technique

Orthogonal Frequency Division Multiplexing (OFDM) is an efficient method of data transmission for high speed communication systems. However, the main drawback of OFDM system is the high Peak to Average Power Ratio (PAPR) of the transmitted signal. OFDM consist of large number of independent subcarriers, as a result of which the amplitude of such signal can have high peak values. Pulse shaping using root-raised cosine filter is used here to reduce PAPR. Significant reduction in PAPR has been achieved using this pulse shaping technique. The performances of the OFDM system with and without pulse shaping are also compared in this paper. Keywords— Orthogonal frequency division multiplexing (OFDM), peak-to-average power ratio (PAPR), Root-raised cosine (RRC), complementary cumulative distribution function (CCDF).