BP神经网络用于函数拟合与模式识别，数学方法是部分子空间法，对HARQ系统的吞吐量分析，使用大量的有限元法求解偏微分方程，包括广义互相关函数GCC时延估计，DC-DC部分采用定功率单环控制。- BP neural network function fitting and pattern recognition, Mathematics is part of the subspace, HARQ throughput analysis of the system, Using a large number of finite element method to solve partial differential equations, Including the generalized cross-correlation function GCC time delay estimation, DC-DC power single-part set-loop control.