Secure Multiuser Communications in Wireless Sensor Networks with TAS and Cooperative Jamming

Area of Science:

• Wireless communication
• Network security
• Signal processing

Background:

• Wireless Sensor Networks (WSNs) face security challenges.
• Existing schemes can be complex and power-intensive.
• Secure data transmission is crucial for WSNs.

Purpose of the Study:

• To propose and analyze novel hybrid secure transmission schemes for WSNs.
• To improve secrecy performance by reducing complexity and extending battery life.
• To optimize system parameters for enhanced security and throughput.

Main Methods:

• Employing Switch-and-Stay Combining (SSC) for sensor node scheduling.
• Utilizing Transmit Antenna Selection (TAS) at the Base Station (BS).
• Implementing Cooperative Jamming (CJ) with Zero-Forcing Beamforming (ZFB) or Null-Space Artificial Noise (NAN) schemes.

Main Results:

• Derived exact closed-form expressions for secrecy outage probability and effective secrecy throughput.
• Determined optimal switching thresholds and power allocation factors.
• Validated theoretical analysis with numerical results.

Conclusions:

• The proposed TAS-SSC-ZFB and TAS-SSC-NAN schemes offer satisfactory secrecy performance in WSNs.
• Optimization of parameters significantly impacts secrecy outage probability and effective secrecy throughput.
• The study provides a framework for designing secure and efficient WSNs.