对基于物理层网络编码的正交频分复用(OFDM)双向中继系统中的无线资源分配问题进行了研究,在总功率和用户对速率受限条件下,给出了一种复杂度较低,以最大化系统容量为目标的资源分配策略.利用凸优化技术对子载波内的用户终端和中继节点的功率分配问题进行分析,得到用户终端和中继节点的功率闭合关系表达式.基于该结果,将原优化问题中的三维变量搜索降低为一维变量搜索,较大地降低了算法的复杂度.仿真结果表明,在多种典型场景中,所提方案较传统随机调度分配方案有较大的性能提升,且逼近最优分配方案的性能. The problem of wireless resource allocation in Orthogonal Frequency Division Multiplexing (OFDM) two-way relay system based on physical layer network coding is studied. Under the condition of total power and user limited rate, a more complicated Low and maximizing the system capacity.The power distribution of user terminals and relay nodes in subcarriers is analyzed by using convex optimization technique to obtain the power closure relation between user terminals and relay nodes. Based on the result, the search of three-dimensional variables in the original optimization problem is reduced to one-dimensional variable search, which greatly reduces the complexity of the algorithm.The simulation results show that in many typical scenarios, the proposed scheme has more advantages than the traditional random scheduling scheme Larger performance gains and approximations to optimal allocation performance.