A communication device, such as a smartphone or tablet, includes a communication interface with noise cancellation logic. Consequently, the invention is directed to improving pulse-oximetry by incorporating additional signals to aid in the triggering of the pulse-oximeter or in analyzing the data received by the pulse oximeter. The mattress system includes transverse, lateral support ribs upon the support surface of the mattress. The bulge curvature is generally between about 0. A urine drainage inlet is located less than an inch below the barb. Each feed structure includes feed locations positioned between spaced apart ends of the body portion according to short circuit locations of desired frequencies to facilitate propagation of electromagnetic energy at the desired frequencies.