Adaptive-CDM: ANewAQM Controller toCope withTCP/AQMNetworks Dynamics

A new adaptive controller basedon coefficient diagram method(CDM)asanactive queuemanagement (AQM) methodisintroduced. Inthedeveloped AQM (ACDM),the outputfeedback poleplacement isimplemented inanindirect ModelReference Adaptive Control (MRAC)scheme, inwhich theclosed loopcharacteristic polynomial isdetermined byCDM andthesystemparameters areestimated usinga modified recursive gradient method.Thismethodpreserves existing features ofCDM controller inthecontrol ofnetworks with unknownorvarying parameters. Simulation results illustrate the goodperformance ofthecontroller.