【摘要】 针对基于功率域非正交多址接入(Power Domain Non-orthogonal Multiple Accesses, PD-NOMA)的正交频分复用(Orthogonal Frequency Division Multiplexing, OFDM)水声下行通信系统的功率分配问题，提出了一种基于中断概率的功率分配方法。用户节点在系统初始化阶段根据源节点广播的组网数据包获取水声信道的统计特征，源节点根据水下用户反馈的信道特征参数建立水下用户的中断概率模型，以最小化两用户的中断概率和为目标建立目标函数，在中断概率区域边界上遍历搜索最优的功率分配系数。仿真结果表明，该方法在保证公平性的条件下，有效降低了用户节点的中断概率，提高了系统的频谱利用率和误码性能。更多还原

【Abstract】 An outage probability based power allocation method is proposed for the power domain non-orthogonal multiple accesses based orthogonal frequency division multiplexing(OFDM) underwater acoustic downlink communication system. User nodes obtain the statistical characteristics of the underwater acoustic channel according to the network-forming data packets broadcast by the source node in the system initialization phase. The outage probability model of the underwater users is established according to the channel characteristic parameters returned by user nodes. The objective function for minimizing the sum of two-user outage probability is established. The optimal power allocation coefficient is obtained by seeking the boundary of the ergodic outage probability region. Simulation results show that the proposed method effectively reduces the outage probability of user nodes and improves the spectrum utilization and BER performance of the system under the premise of guaranteeing fairness.更多还原