A method of doping fins of a semiconductor device that includes a substrate includes forming multiple fin structures on the substrate, each of the fin structures including a cap formed on a fin. In a method of arranging at least one base station and repeaters in a mobile communication system, a base station cell is formed and N repeater service areas are formed at boundaries of the base station cell. A controller is operable for actuating the digital display to change the display to communicate information relating to the actuated telltale. The measured frequency spectrum is then analyzed to detect the presence of interferers aliased into the desired frequency band. A specific number of the remaining specific patterns in each data coding block are filled to serve as a code for representation of data.