Abstract: Orthogonal frequency division multiplexing (OFDM) is a transmission technique widely used by various wireless communication technologies. The OFDM system still has a weakness, which is the high value of the peak to average power ratio (PAPR). The high PAPR value causes inefficient use of power amplifiers (PA). With this incident, a more effective way is needed to reduce the PA, namely by using a pre-distorter on the OFDM signal before entering the high power amplifier (HPA). The purpose of decreasing the PAPR value is to compensate for the nonlinearity of the HPA and simultaneously improve system performance. The value of the input signal strength that is close to the PA nonlinear saturation region will experience nonlinear distortion and result in a worse system. A decrease in the PAPR value will be carried out to reduce the signal that has a large amplitude from the possibility that could occur. Therefore, in this OFDM system, a clipping filtering technique will be used, with the value of the clipping ratio (CR) to produce the PAPR0 value, through the CCDF (Complementary Cumulative Distribution Function) curve. The results of the study using a Clipping Filtering to determine the minimum PAPR reduction value in the form of a CCDF (Complementary Cumulative Distribution Function) curve with a predetermined Clipping Ratio (CR) value parameter, the results of observing the probability of PAPR > PAPR0 are 10-4 on an OFDM transmitter system without reduction (OFDM) produces a PAPR0 value of 9,727 dB.
Keywords: OFDM, PAPR, HPA, clipping filtering, CCDF
| DOI: 10.17148/IARJSET.2021.81034