Novel Noise Injection Scheme to Guarantee Zero Secrecy Outage under Imperfect CSI.

Area of Science:

• Wireless communication security
• Information theory
• Signal processing

Background:

• Multiple-input single-output multiple-antenna-eavesdropper (MISOME) systems face security challenges due to potential eavesdropping.
• Imperfect channel estimation at the legitimate receiver can compromise secure communication.
• Achieving guaranteed security (zero secrecy outage) is a critical design goal.

Purpose of the Study:

• To propose a novel artificial noise (AN) injection strategy for MISOME systems.
• To demonstrate the achievability of zero secrecy outage probability under imperfect channel estimation.
• To analyze the impact of system parameters on secrecy throughput and energy efficiency.

Main Methods:

• Development of an artificial noise (AN) injection strategy tailored for MISOME systems.
• Mathematical proof of zero secrecy outage probability achievability.
• Analysis of secrecy throughput and energy efficiency under varying conditions, including perfect channel state information.

Main Results:

• Zero secrecy outage probability is proven to be achievable irrespective of the eavesdropper's antenna count or location.
• Proper selection of secrecy and codeword rates is crucial for guaranteeing security.
• Zero-outage secrecy throughput demonstrates a positive correlation with transmit power when channel state information is perfect.

Conclusions:

• The proposed AN injection strategy effectively enhances physical layer security in MISOME systems.
• The strategy guarantees zero secrecy outage probability, offering robust protection against eavesdropping.
• The findings provide valuable insights for designing secure and energy-efficient wireless communication systems.