基于QoS驱动的OFDMA中继系统节能资源分配算法研究

Study on QoS-driven energy-efficient resource allocation algorithm in OFDMA relay systems

文章研究基于QoS驱动的OFDMA放大转发中继系统节能资源分配算法,目标是在满足各用户业务时延QoS要求的前提下,最小化OFDMA中继系统总功率.基于有效容量模型,首先把OFDMA放大转发中继系统资源分配问题形成为混合整数规划问题,然后通过整数约束连续松弛化,把问题转化为凸优化问题.通过求解该凸问题,推导得到了资源分配的迭代优化算法.仿真结果表明,与已有算法相比,对于各种类型时延QoS要求的无线业务,文章提出的资源分配优化算法均可明显降低系统消耗功率.

In the paper, the QoS-driven energy-efficient resource allocation algorithm for OFDMA amplify-andforward relay systems is investigated. The goal is to minimize the system total power while providing delay QoS guarantees for the services of the users in the system. Firstly, based on the effective capacity model, the resource allocation problem is formulated as a mixed integer programming problem. Then, the problem is transformed into a convex problem by continuous relaxation on integer constrains. By solving the convex problem, an alternative algorithm to optimize the resource allocation is developed. The derived analytical and simulation results show that compared with the existing algorithms, the developed resource allocation optimization algorithm can decrease much power consumption under various delay QoS constraints of transmission services.