Base stations control the transmission rate that is used by UE to forward them information. For such thermal protection, metal coatings, ceramic materials, ablative materials, and various matrix materials have all been tried, but none have been found entirely satisfactory. In one embodiment, the credential caching proxy server intercepts and caches a wireless client’s credentials when a credential is first sent from the wireless user agent to a protected server. A band-limited signal generation unit excludes, within the frequency band of an input signal, the frequency band selected by the adaptive band selection unit from the coding object, or attenuates the energy of the frequency band selected by the adaptive band selection unit.