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Optimization of PAPR Using HPA and Amplitude Clipping Reduction Technique

Ritesh Baranwal

In modern age, the service users of every network desire faster downloading speed/data rates so that they can watch live cricket, live video conferencing, IRCTC Ticket Booking etc. A technique known as OFDM is used to achieve faster speed. Orthogonal Frequency Division Multiplexing (OFDM) has been more popular for broadband wireless transmission due to its robustness against multipath fading. In OFDM system, orthogonally sub-carrier are used to carry the data from the transmitter end to the receiver end with the presence of guard band. OFDM gives us benefits like high spectral efficiency, resiliency of RF interference and lower multi-path distortion. But OFDM has disadvantage in form of high PAPR (Peak to average power Ratio) and thus, when OFDM signal pass through power amplifier system the signal distort [2]. So a need of technique which reduces PAPR and amplitude clipping is one of the techniques used to reduce PAPR .In amplitude clipping, a threshold value of the amplitude set and any subcarrier having the amplitude more than that value is clipped or that subcarrier is filtered to bring out a lower PAPR values.