Improved coding gain of clipped OFDM signal using avalanche effect of AES block cipher

Although Orthogonal Frequency Division Multiplexing (OFDM) seems to be a solution to achieve the demand of high data rates and immunity to the multipath fading channel, it has some drawbacks. High Peak to average power ratio (PAPR) is the most significant problem of these drawbacks. The main objective of this paper is to introduce a modified PAPR reduction technique named as samples clipping and then use a new channel coding approach to enhance the Bit Error Rate (BER) performance with a degree of complexity. This approach is performed by enhancing the cooperation between soft decision decoding and cryptography. This approach is also performed with Binary Phase Shift Key (BPSK) and Quadrature Phase Shift Key (QPSK) modulation techniques. The PAPR and BER performance calculations for the proposed system are investigated and validated by MATLAB simulation results. These results are evaluated under Additive White Gaussian Noise (AWGN) in addition to Rayleigh and Rician Fading channels.