A Note on the Secrecy Capacity of the Multi-antenna Wiretap Channel
Tie Liu, Shlomo Shamai (Shitz)
TL;DR
This paper offers an alternative characterization of the secrecy capacity for multi-antenna wiretap channels, utilizing a channel enhancement approach and an extremal entropy inequality, providing new insights into optimal transmission strategies.
Contribution
It introduces a novel characterization method based on channel enhancement and entropy inequalities, differing from previous Sato-like arguments.
Findings
New characterization of secrecy capacity
Utilizes extremal entropy inequality
Provides physical intuition for optimal strategies
Abstract
Recently, the secrecy capacity of the multi-antenna wiretap channel was characterized by Khisti and Wornell [1] using a Sato-like argument. This note presents an alternative characterization using a channel enhancement argument. This characterization relies on an extremal entropy inequality recently proved in the context of multi-antenna broadcast channels, and is directly built on the physical intuition regarding to the optimal transmission strategy in this communication scenario.
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Taxonomy
TopicsWireless Communication Security Techniques · Advanced MIMO Systems Optimization · Cooperative Communication and Network Coding