Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is one of the popular methods that used to transmit the data in high speed rate in cellular communication. However, OFDM has a high Peak to Average Power Ratio (PAPR) which caused by the non-linearity of the High Power Amplifier (HPA) that provides transmission power to the OFDM signal. The high PAPR caused the OFDM signal to be low in efficiency and giving a high bit error rate. Thus, in this paper, a method for PAPR reduction that caused by the HPA is proposed. Precoding technique is one of the popular way to compensate the bad impact of the HPA by reducing the PAPR of the signal. In this paper, the bad impact caused by the HPA model on the OFDM signal will be analyzed. Moreover, the PAPR of the OFDM signal by using precoding techniques will be compared with the PAPR of the OFDM signal without precoding technique. From the simulation results, it was found that the ZCT-OFDM has a better PAPR reduction compared to the DCT and WALSH technique. It was also found that the lower the order of modulation scheme is, the better the PAPR reduction performance for OFDM signal compared to higher order modulation scheme.

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