Artificial Noise Injection and Its Power Loading Methods for Secure Space-Time Line Coded Systems

Area of Science:

• Wireless communication security
• Information theory
• Signal processing

Background:

• Space-time line coded (STLC) systems are susceptible to eavesdropping by illegitimate receivers.
• Improving the secrecy rate in STLC systems is crucial for secure data transmission.
• Existing methods may not fully exploit the STLC structure for enhanced security.

Purpose of the Study:

• To propose a novel artificial noise (AN) injection method for 2x2 STLC systems.
• To enhance the secrecy rate of STLC systems against eavesdroppers.
• To derive the optimal power loading factor for the designed AN.

Main Methods:

• Design of a novel AN tailored to the STLC structure.
• Derivation of the optimal power loading factor for AN.
• Performance evaluation through numerical simulations.

Main Results:

• The proposed AN injection method significantly improves the secrecy rate of STLC systems.
• The optimal power loading factor enhances the effectiveness of the AN.
• The method shows greater efficacy when there is a substantial difference between main and eavesdropper channel gains.

Conclusions:

• The developed AN injection technique effectively secures STLC systems.
• The proposed method offers a significant improvement in secrecy rate compared to conventional STLC systems.
• Exploiting channel gain differences is key to maximizing security benefits.