PERFORMANCE EVOLUTION OF PAPR REDUCTION IN OFDM WITH AND WITHOUT LDPC TECHNIQUE

The OFDM is one of the proven multicarrier modulation techniques, which provides high spectral efficiency, low implementation complexity, less vulnerability to echoes and non - linear distortion. Apart from the above advantages presently this technique is us ed by almost all wireless standards and above. The one major shortcoming in the implementation of this system is the high PAPR (peak - to - average power ratio) of this system. In this paper, Irregular Low - Density - Parity Check encoder is used effectively to re duce PAPR problem& improves BER. Low Density Parity Check codes (LDPC) are promising techniques to reduce the peak - to - average power ratio (PAPR) for orthogonal frequency division multiplexing (OFDM). Almost all peak - to - average power ratio reducing techniqu es are degrading the BER performance. The result shows that proposed system with LDPC code improves performance of BER than without LDPC coding. The performance of system i s simulated by MATLAB software