Authors : G. Dhanya and J. Jayakumari
Abstract: The speech scrambling is very important for providing security in communication systems. Many of the scrambling techniques show poor performance. In this study, a new time domain based scrambling using pseudo random sequences is proposed for OFDM based scramblers. In this technique pseudo random sequences are used to scramble the data at the transmitter side and at the receiver, descrambling of data is infeasible without the knowledge of a secrete key. The system is simulated and quality of the speech is measured using Perceptual Evaluation of Speech Quality (PESQ) and the intelligibility is measured using Speech Transmission Index (STI) and Common Intelligibility Scale (CIS). The simulation result shows that the proposed approach provides more security and gives better performance compared to conventional technique.
G. Dhanya and J. Jayakumari, 2016. Improved Ofdm Based Speech Scrambler for next Generation Mobile Systems. Research Journal of Applied Sciences, 11: 224-228.