Systems and methods of gathering WLAN packet samples to improve position estimates of WLAN positioning device. The semiconductor switch circuit is respectively controlled by PWM to supply a constant current to the load connected to a secondary winding of the transformer. An atomically stable two dimensional crystalline film resides on the epitaxial insulating layer with a coincident lattice match to the insulating interlayer. A first conductive layer is deposited over the first and second conductive lines the said trench. One or more initially-occluded perforations in the outer layer maintain the uniformity in combustion of the tobacco and ignition element. Each compression UDT is associated with one or more UDT methods to compress data according to one or more respective compression algorithms.