Digital circuit simulation study of Lossy source coding for PAPR reduction

Abstract

Telecommunication field is emerging rapidly with the huge demand for data communication and orthogonal frequency division multiplexing is one such modulation. The efficiency of an OFDM technique is high and multipath fading is improved to a greater extent. In spite of these benefits with an OFDM technique the instantaneous increase in the power output is the major drawback of an OFDM which results in high Peak to average power ratio. Due to this high PAPR the signal quality will degrade and reduces the efficiency. To reduce the PAPR in the OFDM symbol, a Lossy Coding method was proposed and implemented in Lab VIEW. OFDM symbols are generated for different symbol lengths and peak power is calculated for all possible combinations of the symbol lengths. The observation made was that only four combinations had high value of peak power compared with the other possible combinations. The proposed method reduces the peak power of the four combinations which in turn reduces the PAPR but with the signal distortion. This enforces Bit error rate. We also observed that as the length of the symbol increases the bit error rate will decrease.