An object of the invention is to provide a compact and inexpensive pipe bending processing apparatus. Multiple polarizers having relatively poor extinction ratios can be stacked together as polarizer assemblies having higher extinction ratios than possible with the individual components. The frame includes 5 subframes, the 5 subframe comprise type-1 subframes including 6 Orthogonal Frequency Division Multiplex Access symbols and type-2 subframes including 7 OFDMA symbols, and a Cyclic Prefix length of the frame corresponds to \u215b of an effective symbol length.