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EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING CONCEPT

The physical layer security of OFDM systems over wireless channels was investigated from an information-theoretic perspective in based on the theoretical secrecy capacity  several OFDM security techniques have been proposed. A secure OFDM system was investigated by degrading the eavesdropper’s channel condition, where distributed transmitters independently sent out pre-equalized OFDM signals power and subcarrier allocation schemes in OFDM systems subject to the power and security constraints were reported in moreover, transmit beamforming artificial noise.

In a coordinate interleaving method was utilized to decrease the error rate in cooperative relay networks. However, none of these works take into account security issues.

PROPOSED CONCEPT

     We propose a simple and effective anti eavesdropping OFDM system, by exploiting dynamic coordinate interleaving at a subset of OFDM subcarriers. Technically, the transmitter interleaves the real and imaginary components of a subcarrier symbol when its associated channel phase is larger than a predefined threshold Based on channel reciprocity, the legitimate receiver can locally deduce subcarriers that undergo coordinate interleaving without any additional signaling.

 Compared with existing security approaches, the proposed scheme guarantees computational security without any requirement of eavesdropping channel information, secret information exchange or special cipher processing. In addition, it only needs minor modifications to off-the-shelf systems, and has low computational complexity.

ALGORITHM / TECHNIQUE

   physical-layer transmission parameters of OFDM signals can be blindly estimated

ALGORITHM / TECHNIQUE

 Dynamic coordinate interleaving

       Eavesdropping

DRAWBACKS

 Traditional upper-layer security mechanisms cannot completely address security threats in wireless OFDM systems.

ADVANTAGES

 Improved data rate as compared with other techniques.

 The SER is less.