Integrated Physical Layer Security Design on MIMO-OFDM Systems and BICM-OFDM Systems

• Main Authors: Chih-Yao Wu, 吳之堯
• Other Authors: 葉丙成
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/75483761266059787680

碩士 === 國立臺灣大學 === 電信工程學研究所 === 99 === Wireless communication networks become increasingly pervasive in our daily life. But the broadcasting nature makes wireless communication networks vulnerable to eavesdropping. Any receivers receive the transmitted signals are able to analyze the signals. Thus, privacy and security take an important role in wireless communication networks. Recently, providing security on physical-layer draws lots of interests. Physical-layer security can be achieved by secrecy extraction from wireless channel. Based on channel reciprocity, the legitimate nodes share correlated randomness. In this thesis, we propose two different schemes that extract secrecy from wireless channel. The first one is called P-MOPI, proposed to generate secret keys without sacrifice of MIMO gain for MIMO-OFDM systems. The precoding matrix index (PMI) is utilized as an efficient key generation mechanism and the reference signals are rotated to prevent eavesdropper from learning any secret key information. The P-MOPI scheme easily allows two communicating parties to generate abundant identical secret bits. Both secure communication and the MIMO gain can be guaranteed by using the P-MOPI scheme. The second achievement is the INTERSECT scheme which uses the secret interleaver to ensure confidential transmission for BICM-OFDM system. The order of wireless channel is then utilized as a nature secret source for secret interleaver generation. Computer simulations are done to evaluate the feasibility of our proposed schemes. The results shows the proposed P-MOPI and INTERSECT scheme provides excellent security and are suitable for modern wireless communication systems.