基于保密度的OFDMA中继网络资源分配研究

考虑到异构双向中继网络中存在窃听者的安全资源分配问题，为了提高中继安全性，该文研究了受限于子信道分配和功率约束的用户安全保密度问题模型，与传统的保密容量模型相比，安全保密度模型更侧重于反映用户本身的安全程度。基于此保密度模型，该文进一步考虑了不同用户的安全服务质量(Quality of Service, QoS)需求和网络公平性，联合优化功率分配、子信道分配、子载波配对，并分别通过约束型粒子群、二进制约束型粒子群优化算法和经典的匈牙利算法找到最优解，实现资源的最优分配，提高网络中合法用户的保密度。仿真结果验证了所提算法的有效性。

Research on the Resource Allocation of OFDMA Relay Network Based on Secrecy Ratio

Considering the security resource allocation problem in the two-way relay networks exiting an eavesdropper, to improve the security of the relay, a security secrecy ratio scheme under the constraint of subchannel allocation and power is studied in this paper. Compared to the traditional secrecy capacity scheme, the security secrecy ratio scheme pays more attention to reflecting the users own security extent. Based on the proposed scheme, security Quality of Service (QoS) requirement for different users and the network fairness are further considered. Besides, power allocation, subchannel allocation and subchannel pairing are joint considered. Then, the optimal solution is obtained through Constraint Particle Swarm Optimization (CPSO) algorithm, Binary CPSO (B_CPSO) algorithm and Classic Hungarian Algorithm (CHA), respectively. Finally, the network resources are allocated in an optimal manner and the secrecy ratio for legitimate users is improved. Simulations results show the effectiveness of the proposed algorithm.