  We formulate a scale-invariant hidden local symmetry (HLS) as a low-energy
effective theory of walking technicolor (WTC) which includes the technidilaton,
technipions, and technirho mesons as the low-lying spectra. As a benchmark for
LHC phenomenology, we in particular focus on the one-family model of WTC having
eight technifermion flavors, which can be, at energy scales relevant to the
reach of the LHC, described by the scale-invariant HLS based on the manifold
$[SU(8)_L \times SU(8)_R]_{\rm global} \times SU(8)_{\rm local}/SU(8)_V$, where
$SU(8)_{\rm local}$ is the HLS and the global $SU(8)_L \times SU(8)_R$ symmetry
is partially gauged by $SU(3) \times SU(2)_L \times U(1)_Y$ of the standard
model. Based on the scale-invariant HLS, we evaluate the coupling properties of
the technirho mesons and place limits on the masses from the current LHC data.
Then, implications for future LHC phenomenology are discussed by focusing on
the technirho mesons produced through the Drell-Yan process. We find that the
color-octet technirho decaying to the technidilaton along with the gluon is of
interest as the discovery channel at the LHC, which would provide a
characteristic signature to probe the one-family WTC.
