Distributed antenna systems provide location information regarding client devices communicating with remote antenna units in a service area. For estimating a time when which the real pressure of the releasing clutch decreases to a level of not higher than the initial pressure, the response of the real pressure relative to an oil pressure command value for the releasing clutch is approximated using a transfer characteristic of \u201cfirst order lag+time delay. The ceramic catalyst carrier has excellent thermal shock resistance, good compatibility with the active metal coating and metal coating deposition processes, melting point above >2300\xb0 C. Cascaded identical stages of the corrector may be provided so that distortion in the channel is successively reduced towards zero by each successive stage. For each system, system-level language instructions allow for the specific configuration.