Optimization of Peak to Average Power Ratio Reduction Using Novel Code for OFDM Systems

摘要

Communication is one of the important aspects of our day to day life. The field of communication has been increasing rapidly in order to fulfill the requirements of the human needs. In the first generation communication, information was transmitted in analog domain and later digital domain to overcome disadvantages existed in the analog. For better transmission, single carrier modulation has been replaced by multicarrier modulation. Orthogonal Frequency Division Multiplexing (OFDM) is a form of multicarrier modulation technique that transmits information bearing signals through multiple carriers. The carriers are different frequencies and orthogonal to each other. Orthogonality in OFDM reduces bandwidth usage and frequency selective fading due to multipath. However, the main drawback of OFDM system is its high peak-to-average power ratio (PAPR). Increasing Peak power is a significant problem in OFDM system because it degrades the power amplifier performance. Above the threshold range they become non linear resulting in signal distortion. Several techniques are found in literature to reduce the PAPR viz. Amplitude clipping and filtering, Selected level mapping (SLM), Partial transmit sequence (PTS), and Interleaving. In this paper, a Novel code is proposed to reduce PAPR. Simulations are performed by using MATLAB tool and results are analyzed for different systems (Uncoded, Hamming Code, and Novel Code). The results demonstrate that Novel Code is an efficient technique that reduces PAPR when compared to Hamming code and uncoded system.