def setUp (self):
        self.tb = gr.top_block ()
        self.tp = drm.transm_params(1, 3, False, 0, 1, 0, 1, 1, 0, False, 24000, "station label", "text message")
        vlen_msc = self.tp.msc().N_MUX() * self.tp.ofdm().M_TF()
        vlen_sdc = self.tp.sdc().N()
        vlen_fac = self.tp.fac().N() * self.tp.ofdm().M_TF()
        self.cell_mapping = drm.cell_mapping_cc(self.tp, (vlen_msc, vlen_sdc, vlen_fac))