A voice over WLAN diagnostic system. The ESD protection circuit comprises a first silicon controlled rectifier, and in some embodiments a second silicon controlled rectifier, and a parasitic diode. According to another aspect of the invention, method and computer readable medium is disclosed for carrying out the above method. Thus, the quantity of data passing through the folding portion fromto the lower enclosure for the application processing is reduced. Channel parameter estimation can be enhanced by weighting the channel impulse response estimates based upon a deviation from average.