Asian Science
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Abstract: Stupendous advances in Digital Communication have brought
about the advent of internet culture benefiting the people in many ways. Just
as fire is a good servant, but a bad master, so is the case with internet. With
internet, stealing and unauthorised usage of data remains unrestrained. In addition,
use of high multimedia applications demands for higher data rates. To accommodate
the challenging needs of higher data rate requirements, Orthogonal Frequency
Division Multiplexing (OFDM) proves to be the propitious solution. Hacking over
wireless environment can be staved off by incorporating the emerging information
hiding techniques with OFDM system. This study analyses the performance of OFDM
system using modulation schemes like Binary Phase Shift Keying (BPSK), Quadrature
Phase Shift Keying (QPSK) and Quadrature Amplitude Modulation (QAM) and then
the confidential information is embedded after interleaving and passed over
AWGN channel. Interleaving serves two purposes primarily it reduces burst errors
and it needs two different keys intact, one to stipulate the scrambling of the
data bits and the other to identify the secret data embedding. It is observed
from the simulation results that the BER of the system can be improved by rearranging
the input data streams through interleaving, thereby reducing the random errors
due to noisy wireless channel environment. The BER graph is simulated for various
modulation schemes prior to embedding and after embedding the confidential information.