The broadcast approach over fading Gaussian wiretap channels

Yingbin Liang, Lifeng Lai, H. Vincent Poor, Shlomo Shamai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Scopus citations

Abstract

A (layered) broadcast approach is studied for fading wiretap channels. The basic idea is to employ superposition coding to encode information into a number of layers and use stochastic encoding for each layer to keep the corresponding information secret from an eavesdropper. The legitimate receiver successively decodes information one layer after another by canceling the interference caused by the layers that the receiver has already decoded. The advantage of this approach is that the transmitter does not need to know the channel states to the legitimate receiver and the eavesdropper, but can still securely transmit certain layers of information to the legitimate receiver. The layers that can be securely transmitted are determined by the channel states to the legitimate receiver and the eavesdropper. The Gaussian wiretap channel with fixed channel gains is first studied to illustrate the idea of the broadcast approach. Three cases of block fading wiretap channels with a stringent delay constraint are then studied, in which either the legitimate receiver's channel, the eavesdropper's channel, or both channels are fading. For each case, the secrecy rate that can be achieved by using the broadcast approach is obtained, and the optimal power allocation over the layers (or the conditions on the optimal power allocation) is also derived.

Original languageEnglish (US)
Title of host publication2009 IEEE Information Theory Workshop, ITW 2009
Pages1-5
Number of pages5
DOIs
StatePublished - Dec 7 2009
Event2009 IEEE Information Theory Workshop, ITW 2009 - Taormina, Sicily, Italy
Duration: Oct 11 2009Oct 16 2009

Publication series

Name2009 IEEE Information Theory Workshop, ITW 2009

Other

Other2009 IEEE Information Theory Workshop, ITW 2009
CountryItaly
CityTaormina, Sicily
Period10/11/0910/16/09

ASJC Scopus subject areas

  • Computational Theory and Mathematics
  • Computer Networks and Communications
  • Information Systems
  • Electrical and Electronic Engineering

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  • Cite this

    Liang, Y., Lai, L., Poor, H. V., & Shamai, S. (2009). The broadcast approach over fading Gaussian wiretap channels. In 2009 IEEE Information Theory Workshop, ITW 2009 (pp. 1-5). [5351480] (2009 IEEE Information Theory Workshop, ITW 2009). https://doi.org/10.1109/ITW.2009.5351480