A wireless communication system implements Forward Error Correction and Interpolated Tree Orthogonal Multiplexing. Multiple receivers introduce variations in arrival times that can be less than the period of an operating signal, and also less than the period associated with a sampling operation. The input section includes a single waveguide in each period and it is efficiently coupled with minimal loss to the output section, whose waveguides are approximately arranged with period \u03b12 in the final region close to the output circle. The Cr layer having a coating film quantity of 2000 to 8000 mgm2 may be formed on the surface of the substrate on a side to which the solar cell layer is laminated, and a film forming temperature of the solar cell layer is more than 800\xb0 C. The plurality of elastic assemblies are assembled within the mounting holes of the ball socket member, respectively, and elastically resist against a periphery of the ball joint member.