Performance Comparison of ASC and PTS to Reduce PAPR in OFDM WLAN System

The main objective of this paper is to implement a post- Inverse Fast Fourier Transform (IFFT) Peak to Average Power Ratio (PAPR) reduction method based on time domain linear symbol combining to minimize the PAPR at the transmitter. High PAPR is a particular disadvantage of Orthogonal Frequency Division Multiplexing (OFDM) systems and can significantly degrade the power efficiency at the transmitter. The Adjacent Symbol Combining (ASC) method has a relatively low complexity with very less side information bits per symbol and does not require external randomization sequences. This paper will also investigate the impact of the ASC method on the Wireless Local Area Network (WLAN) system Bit Error Rate (BER) performance. It is shown that the BER degradation is relatively small with the forward error correction coding technique. In this paper, the PAPR reduction, complexity and system performance of the ASC technique is compared with the well known Partial Transmit Sequence (PTS), due to the similarities shared. between these PTS and the ASC. The ASC technique is Assistant Professor, Department of Electronics and Communication Engineering, Mepco Schlenk Engineering College, Sivakasi, Tamil Nadu, India Email :geethapriyac2003 @yahoo.com Phone: +91 0452 2525096, 9442046283 Professor, Department of Electronics and Communication Engineering, Thiagarajar College of Engineering, Madurai, Tamil Nadu, India. Email: suganthivijayan@yahoo.comsimilar in principle to PTS techniques in producing multiple time-domain signal representations per OFDM symbol.