International Journal of Engineering and Technology

The OFDM scrambler is most widely used for secure communication. In order to eliminate the intelligibility of speech, speech scrambling is used. Many of the scrambling techniques shows poor performance, to improve the efficiency of the scrambler an efficient speech scrambling technique, random permutation with pseudorandom- generator under multipath fading is proposed. The Common Intelligibility Scale (CIS) and Speech Transmission Index (STI) are used to predict the intelligibility of speech. Also to evaluate the performance of speech the BER (Bit Error Rate) and the SINR (Signal to Interference plus Noise Ratio) was used. By the measurement of PESQ (Perceptual Evaluation of Speech Quality) the recovered speech quality was observed. The simulations show that OFDM scrambler is a best technique for providing extremely high data security for 4G mobile communication when compared to a conventional technique.