  We propose and experimentally demonstrate a bandwidth allocation method based
on the comparative advantage of spectral efficiency among users in a multi-tone
small-cell radio access system with frequency-selective fading channels. The
method allocates frequency resources by ranking the comparative advantage of
the spectrum measured at the receivers ends. It improves the overall spectral
efficiency of the access system with low implementation complexity and
independently of power loading. In a two-user wireless transmission experiment,
we observe up to 23.1% average capacity improvement by using the proposed
method.
