Aiming at the situation where the state of wireless communication links changes over time, in order to achieve real-time updating and adjustment of link reliability prediction,in this paper a wireless communication link reliability confidence interval prediction algorithm based on GA-Elman is proposed. Based on the analysis of the quality characteristics of wireless communication links, a logarithmic distance path loss model is constructed to transform the study of wireless communication link reliability into the study of wireless communication link signal-to-noise ratio. The wireless communication link signal-to-noise ratio signal is decomposed into stationary sequences and noisy sequences through wavelet decomposition, and respectively input into Elman neural networks for prediction. Iteratively optimize the weights and bias parameters of the Elman neural network using genetic algorithm (GA) to improve the accuracy of the prediction model. Combine the predicted values with confidence levels to achieve confidence interval prediction of wireless communication link reliability. Through experimental verification found that the optimal Elman neural network parameters can be obtained when the genetic algorithm iterates 60 times, effectively improving prediction accuracy. This algorithm has higher accuracy and reliability in the field of wireless communication links, and can provide more accurate prediction information, providing strong support for the reliability evaluation and optimization of wireless communication links.
Salehiyan等[3]构建了一个涉及信号传播、噪声干扰、信道条件等多种因素的无线通信系统模型。首先,根据系统模型,选择合适的信号处理技术,并进行性能分析,推导用户可实现率等关键指标。其次,根据同时透射与反射可重构智能表面(Simultaneously transmitting and reflecting reconfigurable intelligent surface,STAR⁃RIS)的工作模式,构建相应的速率优化问题,通过采用合适的优化算法,解决构建的优化问题,找到最优解或接近最优解,从而提高无线通信链路的可靠性。最后,在性能分析和优化算法的基础上,结合历史数据和系统特性,进行置信区间预测。但该无线通信系统模型通常涉及多个变量和参数,增加了模型的复杂度和计算量,导致其在实际应用中的预测效果差、效率低。李新钰[4]根据无线通信链路的特点和LTE-R系统的具体要求,构建了基于随机Petri网(Stochastic Petri net,SPN)的无线通信可靠性模型。首先,通过捕捉无线通信系统中各种随机事件和状态转换,为可靠性分析提供基础。其次,收集与无线通信链路相关的数据,设定SPN模型中的相关参数,实现系统具体运行情况的表征。最后,通过TIME NET仿真,获取数据并统计分析,计算无线通信链路的可靠性指标,评估无线通信链路的性能,利用统计方法预测无线通信链路可靠性的置信区间。然而,无线通信链路质量信噪比时间序列具有随机性和非线性,SPN处理时间序列的能力较差,导致最终实现预测的准确性较差。Wang等[5]先收集无线通信链路的信号强度、噪声水平等多种指标的原始数据,利用数据分析方法从原始数据中提取关键特征,通过计算赫斯特指数确定合适的分数阶差分阶数,以消除数据的非平稳性。然后引入分数阶微分算子,构建分数阶随机配置网络,通过训练完成的模型对未来的无线通信链路状态进行预测,并计算预测值的置信区间获取全面预测信息。但该模型在构建分数阶随机配置网络中引入分数阶微分算子,极大增加了模型的复杂性和计算量;同时,该模型在训练过程中需要应对大量的数据和计算资源。因此,该模型实现预测的实时性和效率无法保证。
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