关键词: 无线自组网, 拥塞控制, 二次型性能指标, 改进神经元PID

Abstract: Neuron PID can regulate the queue size of a bottleneck node successfully，but its control effect is worse when the network state changes.For ad hoc network’s time-varying，it deduces discrete math model of TCP/AQM control object in wireless network.It introduces quadratic performance index to weighting coefficient modification for neuron PID controller.Furthermore neuron gain K is system sensitive coefficient.So constant K can’t be fit for time-varying ad hoc network.Finally，a new improved quadratic performance index neuron PID AQM is proposed.Matlab and NS-2 simulations demonstrate that the performance of new algorithm is better than PI under different link capacity，dynamical topology and sudden flow condition.

Key words: ad hoc network, congestion control, quadratic performance index, improved neuron PID