OFDMA多跳中继网络中基于能效的频谱规划策略

Spectrum Planning Scheme Based on Energy-efficiency for OFDMA Multi-hop Relay Networks

OFDMA中继网络的频谱规划是解决小区内全部资源如何分配给3种链路(直传链路、基站到中继站链路和中继站到用户链路)有效使用的问题。现有的动态频谱规划策略都是根据链路负载需求或干扰情况等,以提高系统吞吐量为目标进行频谱规划。本文针对OFDMA多跳中继网络,综合考虑用户的速率需求、信道质量和干扰情况,以能效为优化目标提出一种基于能效的动态频谱规划策略。基于实际系统中离散的自适应调制编码AMC(Adaptive Modulation and Coding Scheme)建立能效最优化频谱规划模型,并采用最优化理论中的整数规划对模型进行求解。仿真结果表明,基于能效的频谱规划策略在保证用户速率需求的情况下可降低总发射能量,提高能量使用效率,并对用户不均匀分布场景有较强的适应性。

In relay-enhanced OFDMA networks ,sub-carriers are not only allocated to the link from BS （the base station） to MS（the mobile station） ,but also to the links from BS to RS（the relay station） and from RS to MS . T he spectrum planning scheme is to allocate all sub-carriers to the three kinds of links . T he optimization goal of related work is throughput maximization in view of link loads and interference situations . To maximize ener-gy-efficiency ,an energy-efficiency spectrum planning scheme was proposed in this paper ,which considered the users’ data rate requirement , the channel quality and interference situation . T he energy-efficiency spectrum planning model was formulated in OFDMA relay networks on the basis of the discrete adaptive modulation and coding scheme（AMC） in practical systems ,which was solved by integer programming of the optimization theo-ry . The simulation results show that the proposed scheme consumes less energy than other spectrum planning schemes to transmit the same bits , and has strong adaptability to the scene with non-uniform user distribution .