TY  - JOUR
T1  - Improved Ofdm Based Speech Scrambler for next Generation Mobile Systems
AU - Dhanya, G. AU - Jayakumari, J. 
JO  - Research Journal of Applied Sciences
VL  - 11
IS  - 5
SP  - 224
EP  - 228
PY  - 2016
DA  - 2001/08/19
SN  - 1815-932x
DO  - rjasci.2016.224.228
UR  - https://makhillpublications.co/view-article.php?doi=rjasci.2016.224.228
KW  - 4G
KW  -OFDM
KW  -speech scrambling
KW  -technique
KW  -system
AB  - 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.
ER  -