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Physical Communication

Secure wireless multicasting with linear equalization

Dilip Kumar Sarker, M. Z. I. Sarkar, Md. Shamim Anower

Published Aug 4, 2017• 16 citations
Publisher
DOI
10.1016/j.phycom.2017.07.007

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We consider a confidential communication through Rayleigh fading channel in which a source transmits a common stream of information to the multiple client receivers via multiple relays in the presence of an eavesdropper. We assume that there is no direct path from source to client receivers and eavesdropper, and communication occurs only through the relays. In order to increase the spectral efficiency, we consider a linear equalization, e.g., zero-forcing (ZF) in cooperative spatial multiplexing system. Considering the effect of linear equalization, at first, we derive the exact closed-form expression for the ergodic secrecy multicast capacity. Then, we derive the closed-form expressions for the secure outage probability and the complementary cumulative distribution function (CCDF) of secrecy multicast capacity to analyze the outage performance of proposed model.

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Wireless communication security is critical for next-generation high-yield systems such as 5G and 6G. Traditional multicasting protocols often lack a robust framework to ensure proper authentication and privacy, with correlation degrading signal-to-noise ratio (SNR) and reducing overall channel capacity. To increase security, equal gain combining (EGC), one of the diversity-combining techniques mitigates fading and correlation, whereas cooperative relaying chooses the relay with the highest SNR to optimize performance. This paper investigates the combined use of EGC and cooperative relaying to strengthen multicast security. Closed-form expressions for secure outage probability (SOPM) and non-zero secrecy multicast capacity (PNSMC) are derived, considering fading, correlation, and relay diversity. Results show that security improves with stronger fading, more destination antennas, and additional relays, and is adversely affected by increased signal correlation and a higher number of eavesdroppers.
We consider a confidential communication through Rayleigh fading channel in which a source transmits a common stream of information to the multiple client receivers via multiple relays in the presence of an eavesdropper. We assume that there is no direct path from source to client receivers and eavesdropper, and communication occurs only through the relays. In order to increase the spectral efficiency, we consider a linear equalization, e.g., zero-forcing (ZF) in cooperative spatial multiplexing system. Considering the effect of linear equalization, at first, we derive the exact closed-form expression for the ergodic secrecy multicast capacity. Then, we derive the closed-form expressions for the secure outage probability and the complementary cumulative distribution function (CCDF) of secrecy multicast capacity to analyze the outage performance of proposed model.