The projector comprises an image forming panel that forms an effective panel image for modulating the light into an image light in an image forming area of a panel surface, and an image capturing unit for capturing a specific projection area wherein the image light corresponding to a specific area in the image forming area is projected. Inhibiting the activation or denaturation of blood components including blood cells and plasma proteins and with the removal of the activated and denatured components thereby improving safety and efficacy of end products. A set of generally correlated OFDM subcarriers are divided into groups of subcarriers creating a set of group STF subsystems, within which STF coding is applied to each GSTF subsystem.