Abstract
Due to the broadcast nature of wireless media, all nodes in the coverage of a transmitter are capable of capturing its signals, thus wireless transmission is sensitive to wiretapping. Several existing schemes place an emphasis on secrecy rate improvement, under the protocols of amplify-and-forward or decode-and-forward, when there are only relay users in the network. We set up a novel communication model in which normal and two-way relay users coexist in the same cell, taking the base station as a relay. Our objective is to maximize the total secrecy rate, taking subcarrier pairing, subcarrier assignment and power allocation into account, when there is one eavesdropper in one cell of the cellular network. Although this problem is very intricate, we reformulate it as a convex optimization problem by means of Lagrange duality. In order to reduce the computational complexity, equal power allocation is proposed. Lastly, the experimental results show the proposed resource allocation scheme can obtain a higher secrecy rate than traditional schemes.
Highlights
Security refers to the system resistance ability facing man-made threats such as wiretaps, attacks or tampering in the process of data transmission
We have set up the mathematical model to maximize the total secrecy rate when paired and normal users coexists in one cell
We take into account the joint optimization problem consisting of subcarrier pairing, subcarrier assignment and power allocation
Summary
Security refers to the system resistance ability facing man-made threats such as wiretaps, attacks or tampering in the process of data transmission. Due to the broadcasting characteristics of a wireless channel, the mobility of the wireless terminal and the instability of transportation, wireless communication systems are facing more security threats than traditional cable communication systems. Communication privacy and information security in a wireless network has become an important factor demanding more attention, especially in fields such as military and national security. The purpose of secure communication is to ensure that legitimate users can receive source point information, while it prevents eavesdroppers in wireless networks from obtaining information [2]. The physical safety design is from the viewpoint of information theory, and makes good use of the physical characteristics of a wireless channel to achieve the purpose of transmitting information safely; such design ideas have attracted more and more attention from researchers
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