Multi (Carrier+Modulator) Adaptive System-an Anti Fading Stego Approach

• Published in: Journal of applied sciences (Asian Network for Scientific Information) Vol. 14; no. 16; pp. 1836 - 1843
• Main Authors: Praveenkum, Padmapriya, Amirtharaj, Rengarajan, Sai Janani, R., Thenmozhi, K., Rayappan, J.B.B.
• Format: Journal Article
• Language: English
• Published: 01-08-2014
• Subjects: Adaptive control systems; Channels; Control systems; Fading; Intelligence; Modulation; Orthogonal Frequency Division Multiplexing; Simulation
• ISSN: 1812-5654; 1812-5662
• DOI: 10.3923/jas.2014.1836.1843

This study proposes the adaptive modulation scheme in Orthogonal Frequency Division Multiplexing (OFDM) system to counteract fading in the transmission power and the transfer function of frequency selective channel. The prime aim is to maximise the total capacity and transmit power without vitiating the quality of service at the receiver. It can be achieved by making the system smart and subsume some intelligence into it. The authors make the system adapt itself to the channel conditions and choose the well-suited service at that instant. Simulation results have made it clear that adaptive modulation in OFDM system offers the choice of modulation and Forward Error Control Codes with variable rates. The essence of adaptation is maintained even while embedding in wireless transmission to serve the security purposes. Bit Error Rate graph plotted prior to embedding is analyzed and compared with the one plotted for embedded data.