非理想条件下OFDMA系统物理层安全的资源分配算法

针对OFDMA系统中用户QoS需求的差异性,提出了一种非理想状态下不同用户的资源分配算法,即求取用户携带比特数和发射功率最优解问题。基于自适应功率分配增益较小的情况,通过进行功率的平均分配来降低算法复杂度,基于吞吐量最大化原则,将剩余未分配的子载波分配给能获得最大传输速率的用户,提升系统的整体吞吐量水平。仿真结果表明:相对于其他传统资源分配算法,这个算法能够保证不同混合用户的最小传输速率要求的同时,有效提升算法的公平性。

Resource Allocation Algorithm for Physical Layer Security of OFDMA System under Non-ideal Conditions

In view of the difference of user QoS requirements in OFDMA system,a resource allocation algorithm for different users in non-ideal state is proposed.The algorithm is to find the optimal solution of user carry bit number and transmit power.Based on the small adaptive power allocation gain,the complexity of the algorithm is reduced by the average power allocation.Based on the principle of throughput maximization,the remaining unallocated subcarriers are allocated such that users can obtain the maximum transmission rate,and the overall throughput level of the system is improved.The simulation results show that compared with other traditional resource allocation algorithms,the proposed algorithm can ensure the minimum transmission rate of different hybrid users.At the same time,the fairness of the algorithm is improved effectively.