The forks of a bicycle are carried by a head tube shaft and are angled forward and comprise two outer support tubes, one on either side of the wheel. The function of each object type is a 1-dimensional function, which is generated by combining along the radial component. In OFDM broadcasting system the method contains the steps of: transmitting OFDM transmission from the base-station to the subscriber units; transmitting from the subscriber units to the base-station signals that are orthogonal to signals transmitted from the base-station; and receiving the orthogonal signals at the base-station.