PAPR REDUCTION IN OFFSET QPSK OFDM THROUGH LOSSY SOURCE CODING

Orthogonal Frequency Division Multiplexing along with the multiple accesses is the modulation technique used in the fourth generation wireless communication. With the fast growing technology and the huge demand for the increase in the bandwidth has made OFDM as the best modulation technique for high speed transmission. The spectrum of the bandwidth is effectively utilized in an OFDM. This provides higher efficiency and improves the overall performance of the system. Though OFDM has all these advantages there are certain drawbacks which need to be addressed. The major ones include Inter carrier Interference and the ratio of the peak to the average power. The research idea was to consider the drawback and try to overcome it. Hence ratio of the peak to the average power was considered. The methodology is to generate the OFDM symbols with Offset QPSK as the modulation technique and analyze the peak power and peak to average power ratio of the generated symbols and apply the proposed method to reduce it. The lossy coding method falls under the category of the signal distortion. The simulation is performed in MATLAB. The simulation results of the proposed method and the amount of the reduction achieved in ratio of the peak to average power along with the amount of the bit error rate have been discussed in the paper.