A wheat variety designated 26R15, the plants and seeds of wheat variety 26R15, methods for producing a wheat plant produced by crossing the variety 26R15 with another wheat plant, and hybrid wheat seeds and plants produced by crossing the variety 26R15 with another wheat line or plant, and the creation of variants by mutagenesis or transformation of variety 26R15. One embodiment of the apparatus includes two coupled direct space-to-time pulse generators with a channel operation element in between. A defect calibrated factor and a yield impact calibrated factor are introduced herein. Accordingly, in the case where a received level of a preceding signal is extremely lower than that of a delayed signal and a noise level is further lower than the received level of the preceding signal, it is possible to perform pre-equalization using the delayed signal as a desired signal, whereby it is possible to maintain the reception characteristic of a communication partner.