A method of transmitting feedback information in a Multi-Input, Multi-Output system is disclosed. In one embodiment, a mobile wireless device includes an AP positioning system configured to estimate a position of the device based on locations of APs disposed about the device. The invention also provides isomers of oxybutynin and its metabolites that meet these characteristics of minimized incidence andor severity of adverse drug experiences, and maintenance of beneficial and effective therapy for overactive bladder. Application of a second logic level to the at least one input disables termination of the one or more signal lines. The current entering the primary side of the transformer is increased to promote the output current from the secondary side of the transformer.