OFDM双向中继协作系统的资源分配策略

Strategy of Resource Allocation in OFDM-based Two-way Relay Cooperative System

为了提高基于正交频分复用(OFDM)双向多中继协作通信系统的能量效率,降低发射总功率,提出了一种低能耗的无线资源优化分配方案。首先提出一种信道增益调和平均数排序算法完成子载波匹配与最优中继选择,然后从固定的比特速率出发,在保证一定误比特率的前提下,利用拉格朗日法和Fischer算法对各个子载波进行比特优化分配,进一步提升系统能效。仿真结果表明,相比于现有的策略,所提出的资源分配方案明显提升了系统的能量效率。

In order to improve the energy-efficient of OFDM-Based two-way relay cooperative system and minimize the total transmitting power, this paper proposes a joint resource allocation strategy. A best relay selection scheme based on Maximize Harmonic Average sorting is proposed at first, then a power allocation and bit loading strategy is presented to maximize the energy-efficient on the constraints of the sum-rate and bit error rate. Numerical analysis shows that the proposed resource allocation strategy can reduce the transmitted power and improve the energy-efficient impactful.