长安大学信息工程学院,710018,西安
作者简介:孙宝玺(2000—),男,硕士生;
李巍(通信作者),男,副教授,硕士生导师。
收稿:2025-08-30,
纸质出版:2026-06-10
移动端阅览
孙宝玺, 李巍, 翁康怡, 等. 采用
SUN Baoxi, LI Wei, WENG Kangyi, et al.
孙宝玺, 李巍, 翁康怡, 等. 采用
SUN Baoxi, LI Wei, WENG Kangyi, et al.
针对采用太阳能的能量收集(energy harvesting,EH)多中继协作通信网络中断性能较差的问题,基于强化学习理论提出了一种联合中继选择和功率分配策略的优化方法。采用基于太阳辐照度实测数据的随机EH模型用于描述能量收集动态状况;建立了EH多中继协作网络的马尔可夫决策过程模型,定义动作空间、状态空间、收益函数、传输策略和价值函数;使用
Q
学习算法设计了网络传输策略的学习和优化过程,明确了单步学习过程中的动作选择、状态转移和
Q
值更新方法。该优化方法能够根据太阳能EH状态、无线信道衰落状态和所有EH中继的电池电量,动态选择单个中继并确定其发射功率转发信号,以优化网络信息传输中断概率。此外,进行了计算机仿真实验,分析了网络参数对中断概率性能的影响,结果表明:网络中断概率在极高信噪比下存在饱和特性;所提优化方法相对于深度
Q
网络算法,在网络中断概率为10
-2
~10
-3
时可获得3~5 dB的信噪比增益;相对于Actor-Critic和SARSA算法在网络中断概率为10
0
~10
-3
时可分别获得2~3 dB和3~7 dB的信噪比增益。
To address poor outage performance in multi-relay cooperative communication networks with solar energy harvesting(EH),an optimization method forjoint relay selection and power allocation policy was proposed based on reinforcement learning.A stochastic EH model based on measured solar irradiance data was adopted to characterize EH dynamics.A Markov decision process(MDP)model of the EH multi-relay cooperative network was developed to define the action space,state space,reward function,transmission policy,and value function.The learning and optimization procedure for the network transmission policy was designed using the
Q
-learning algorithm,and the action selection,state transitions,and
Q
-value update rules in each learning step were specified.The optimization method was designed to dynamically select a single relay and determine it transmit power for signal forwarding according to the solar EH state,wireless channel fading state,and battery levels of all EH relays,aiming to optimize the network information transmission outage probability.Moreover,computer simulations were conducted to analyze the effects of network parameters on outage probability.The results indicate that the network outage probability exhibits satura
tion behavior at very high signal-to-noise ratio(SNR)levels.Compared with a deep
Q
-network(DQN)algorithm,the proposed method can achieve an SNR gain of 3-5 dB when the network outage probability is 10
-2
-10
-3
.Compared with ActorCritic and SARSA algorithms,the proposed method can achieve SNR gains of 2-3 dB and 3-7 dB,respectively,when the outage probabilityis 10
0
-10
-3
.
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