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Year: 2014 | Volume: 13 | Issue: 12 | Page No.: 2017 - 2021
Padmapriya Praveenkumar, K. Thenmozhi, J.B.B. Rayappan and Rengarajan Amirtharajan
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.