OFDM Systems used for Eavesdropping Prevention

OFDM;

            ORTHOGONAL frequency-division multiplexing (OFDM) has been widely employed in modern wireless communications networks. Unfortunately, conventional OFDM signals are vulnerable to malicious eavesdropping due to their distinct time and frequency characteristics.Physical layer security, which targets communications security at the physical layer, is emerging as an effective complement to traditional security strategies in securing wireless OFDM transmission

 

                                       Fig: Eavesdropping prevention
 
these secrecy capacity based security techniques usually require the knowledge of the eavesdropping channel, which is conditioned on a successful detection of eavesdroppers. Also, additional resource may be needed like cooperative terminals and multiple antennas. Simple proactive eavesdropping prevention for OFDM at the physical layer, without significant modifications to off-the-shelf systems, has yet to be developed.




FOR MORE DETAILS:

DYNAMIC SUBCARRIER COORDINATE INTERLEAVING FOR EAVESDROPPING PREVENTION IN OFDM SYSTEMS