DocumentCode :
1936319
Title :
The gaussian two-way relay channel with wiretapper
Author :
Kim, Sungsoo ; Shin, Won-Yong ; Ishibashi, Koji
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Texas at Austin, Austin, TX, USA
fYear :
2011
fDate :
6-9 Nov. 2011
Firstpage :
1987
Lastpage :
1991
Abstract :
Secrecy capacity is analyzed in a Gaussian two-way relay wiretap channel (TRWC), where two legitimate source nodes wish to exchange their messages through a relay in the presence of an eavesdropper. We assume that all intended nodes operate in full-duplex mode and there is no direct path between two sources. In the Gaussian TRWC, we propose an achievable coding scheme composed of superposed lattice codes with both structured and random codebooks. A jamming strategy is further introduced at the two sources as well as at the relay to maximize the achievable secrecy rate regions, where each node allocates part of its power to jam the eavesdropper. Our result indicates that positive achievable secrecy rates are maintained even for the reversely degraded scenario. In addition, assuming two sources with equal power constraint, it is shown that the scheme asymptotically achieves within 1/2 bit from the cut-set bound based on the channel with no secrecy constraints, as the downlink phase is in the high signal-to-noise ratio regime.
Keywords :
Gaussian channels; channel capacity; channel coding; jamming; telecommunication security; Gaussian two-way relay wiretap channel; cut-set bound; eavesdropper; full-duplex mode; jamming strategy; random codebooks; secrecy capacity; secrecy constraints; secrecy rate regions; signal-to-noise ratio; source nodes; structured codebooks; superposed lattice codes; Downlink; Encoding; Jamming; Lattices; Relays; Upper bound; Vectors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signals, Systems and Computers (ASILOMAR), 2011 Conference Record of the Forty Fifth Asilomar Conference on
Conference_Location :
Pacific Grove, CA
ISSN :
1058-6393
Print_ISBN :
978-1-4673-0321-7
Type :
conf
DOI :
10.1109/ACSSC.2011.6190373
Filename :
6190373
Link To Document :
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