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Publication Type : Journal Article
Publisher : International Journal for Scientific Research & Development, IJSRD - International Journal for Scientific Research & Development
Source : International Journal for Scientific Research & Development, IJSRD - International Journal for Scientific Research & Development| Vol. 3, Issue 03, 2015.
Campus : Chennai
School : School of Engineering
Center : Amrita Innovation & Research
Department : Electronics and Communication
Verified : Yes
Year : 2015
Abstract : Secrecy capacity of a multiple-antenna wiretap channel is studied in the low signal-to-noise ratio (SNR) regime. Expressions for the first and second derivatives of the secrecy capacity with respect to SNR at SNR = 0 are derived. Transmission strategies required to achieve these derivatives are identified. In particular, it is shown that it is optimal in the low-SNR regime to transmit in the maximal-eigenvalue eigenspace of φ = Hm† Hm - Nm/Ne He†He where Hm and He denote the channel matrices associated with the legitimate receiver and eavesdropper, respectively, and Nm and Ne are the noise variances at the receiver and eavesdropper, respectively. Energy efficiency is analyzed by finding the minimum bit energy required for secure and reliable communications, and the wideband slope. Increased bit energy requirements under secrecy constraints are quantified. Finally, the impact of fading is investigated, and the benefits of fading in terms of energy efficiency are shown.
Cite this Research Publication : SitadeviBharathula, GadiamUgesh, B.Ashok, B.N.AjaiVikash,” Secure Communication in Low SNR using MIMO Technique”, International Journal for Scientific Research & Development, IJSRD - International Journal for Scientific Research & Development| Vol. 3, Issue 03, 2015