Graduation Semester and Year

2013

Language

English

Document Type

Thesis

Degree Name

Master of Science in Electrical Engineering

Department

Electrical Engineering

First Advisor

Qilian Liang

Abstract

In smart grid applications, developing appropriate wireless communication architecture is extremely important as wireless communication faces security and reliability challenges. To combat severe communication impairment induced by invader, it is proposed to implement space-time block coding over virtual MIMO. With an increment of diversity in virtual MIMO, BER performance has been improved by 18dB. Furthermore, with more redundant copies of transmitted signals at receiver, reliability of system has increased by 4 times in 4x1 V-MIMO and by 8 times in 8x1 V-MIMO than traditional SISO case. Security challenges from malicious additive attack and data piracy have been examined. Simulations show that malicious attack could be effectively mitigated using space time block coding. It has been verified that more virtual sources will give more diversity gain and better performance. Simulation also shows that data piracy is a very severe problem and cannot be alleviated by space time block code only. Hence, concluded that if the attacked smart meter could be detected, performance could be improved. Finally, studies also showed that, in link failure scenario, the space-time block coding could provide satisfying performances with a low-complexity in design. Extensive numerical studies with use of link adaptation technique and channel coding were also performed under similar attack scenarios which provide forward error correction. Simulations indicate that, even if attacks were very severe, bit-error-rate (BER) performance has been improved by 15 to 25 dB.

Disciplines

Electrical and Computer Engineering | Engineering

Comments

Degree granted by The University of Texas at Arlington

Download

Share

COinS