International Journal on Advanced Science, Engineering and Information Technology, Vol. 8 (2018) No. 2, pages: 628-638, DOI:10.18517/ijaseit.8.2.5267

Confidential Data Transmission Using Subcarrier Randomization with RSA Algorithm for Synchronization on MIMO-OFDM System

Nihayatus Sa’adah, I Gede Puja Astawa, Amang Sudarsono

Abstract

In wireless communication, the transmitted information data is often intercepted by eavesdropper through fading channels. Since the signal is transmitted by the transmitter through a wireless channel, it is not only the authorized receiver but also the attacker or the eavesdropper can easily capture and store the information signal. This research examines the security methods in wireless communication, where the security method used is subcarrier randomization. In the receiver, the subcarrier position must be restored to its original position. To restore the subcarrier position to its original position there needs to be a synchronization between transmitter and receiver. We use RSA algorithm as synchronization between transmitter and receiver. Subcarrier randomization security method is implemented on Multiple Input Multiple Output - Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system. We perform QoS measurements including delay, throughput and packet loss on MIMO-OFDM systems using security and MIMO-OFDM systems without security. From the results obtained, we can prove that the proposed security method does not degrade the performance of the MIMO-OFDM system. MIMO-OFDM system with security can result in smaller packet loss than the MIMO-OFDM system without security. MIMO-OFDM system with security has the average packet loss 0.145%.

Keywords:

MIMO-OFDM; subcarrier randomization; security; RSA; synchronization.

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