Cooperation Based on Decode-and-Forward Plus Cooperative Jamming for Wireless Physical Layer Security
Shuanglin HUANG, Jianjun TAN, Run JIANG
Journal of Digital Information Management, Vol. 13, No. 2, 2015.
DOI: 
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Abstract:
We employed node cooperation in a
cooperative wireless network to achieve physical layer based security. The case of a source-destination pair that
works with the assistance of multiple cooperating nodes in the presence of an eavesdropper was considered in
this study to improve the performance of secure wireless communications. A novel cooperative scheme, called the decode-and-forward plus cooperative jamming (DFCJ), was
proposed. In this scheme, relay nodes transmit a weighted version of the source signals plus a common weighted jamming signal to confound the eavesdropper. The novel system design was proposed to determine cooperative
node weights and transmit power allocation. In DFCJ, a closed-form solution is obtained to minimize the total transmit power that is subjected to a secrecy rate constraint under complete nulling of jamming signals at
the destination. The results of the numerical evaluation of the transmit power and the obtained secrecy rate show that the proposed scheme can significantly improve the
performance of wireless physical layer security compared with the original decode-and-forward scheme.