Proposed combined pts with clipping and filtering technique for PAPR reduction in OFDM system

Abstract EN

One of the major drawbacks of OFDM is high Peak-to-Average Power Ratio (PAPR) which can result in poor power efficie ncy and serious distortion in the transmitter amplifier.

In this paper, the advantages of two different approaches to PAPR re duction are exploited in order to reduce the PAPR more significantly .

The first approach is based on clipping and filtering which provides a high PAPR re duction at the cost of signal distortion.

The second approach (Partial Transmit Sequence PTS or Selected Mapping SLM methods) results in no distortion.

The performance of the three proposed combined methods(Clipping And Filtering with PTS scheme, SLM with Clipping And Filtering sc heme, and PTS with Clipping And Filte ring scheme)are evaluate d on the PAPR distribution function and on the Bit Error Rate as a function of Signal to Noise Ratio in Additive White Gaussian Noise Channe l.

The simulation results show that the proposed PTS with Clipping And Filte ring sc heme provides more PAPR reduction without degradation in the BER performance as compared to the other two proposed scheme (Clipping And Filtering with PTS scheme and SLM with Clipping And Filtering scheme).

The simulation re sults of PAPR reduc tion and BER performance s are simulated using MATLAB R2009a computer simulation software .