Can we Reduce PAPR? OFDM+PTS+SLM+STEGO: A Novel Approach

With the rabid development of the wireless technology, the gadgets that were once a luxury, have now become a necessity. The wireless technology was first developed for army utilisation. But later, because of the wide applications it had, it became a global obligation. But, today, with the advent of internet, the security of the wireless networks has been at a great stake. And also, the new generation of wireless network demands higher data requirements which is achieved by higher data bits per unit bandwidth because of a variety of multimedia applications, cost efficiency, spectral efficiency and security. In this study all of these challenging requirements are met by Orthogonal Frequency Division Multiplexing (OFDM) along with steganography. It is an attractive and explorative area for the next and future generation of wireless multimedia applications. The major challenging issue in the design of an OFDM transceiver is its high Peak-to-Average Power Ratio (PAPR). In this study, design of an OFDM system adopting Partial Transmit Sequence (PTS) and Selected Mapping (SLM) techniques were concentrated. We analyse the system performance for various values of subcarriers and modulation schemes by computing Complementary Cumulative Distribution Function (CCDF) and analysing the Bit Error Rate (BER). PAPR value is low as the number of subcarriers has been increased. PTS outperforms SLM when complexity is considered and SLM is preferred when the redundant bits in the information are high and data embedding algorithm is included after modulation to ensure wireless security.