Title :
Eavesdropping-Resistant Space-Time Network Coding for Cooperative Communications
Author :
Gao, Zhenzhen ; Yang, Yu-Han ; Liu, K. J Ray
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Maryland, College Park, MD, USA
Abstract :
Due to the broadcast nature, wireless transmissions can be overheard by any receiver within the transmission range. A physical layer approach for secure wireless cooperative communications is proposed in this paper. Considering the asynchronous nature of cooperative communications, this paper proposes an eavesdropping-resistant space-time network coding (STNC) scheme for multinode cooperative communications to prevent eavesdropping and overcome the problem of imperfect synchronization. In the proposed scheme, training symbols are transmitted by the destination D instead of the user nodes. Therefore, each user node can obtain the channel state information (CSI) between itself and D, which is unavailable to the eavesdropper E. By exploiting such CSI and the transmit information symbols, weighting coefficient is designed at each user node to prevent E from interception and ensure successful decoding at D. Based on the pairwise error probability (PEP) analysis, STNC is designed to achieve full diversity at D and improve the transmission efficiency of the asynchronous cooperative system. Simulation results are presented to verify the performance of the proposed eavesdropping-resistant STNC scheme.
Keywords :
cooperative communication; error statistics; network coding; space-time codes; telecommunication security; wireless channels; CSI; PEP analysis; asynchronous cooperative system; channel reciprocity; channel state information; eavesdropping-resistant STNC scheme; eavesdropping-resistant space-time network coding; pairwise error probability analysis; physical layer approach; secure wireless cooperative communications; wireless transmissions; Bit error rate; Channel estimation; Communication system security; Encoding; Peer to peer computing; Security; Wireless communication;
Conference_Titel :
Communications (ICC), 2011 IEEE International Conference on
Conference_Location :
Kyoto
Print_ISBN :
978-1-61284-232-5
Electronic_ISBN :
1550-3607
DOI :
10.1109/icc.2011.5962835