A simple base station device 100 is installed in the entrance or the like of a building and a power OFF signal is supplied. In one variation, the device includes a resistor bypassable via a switch, a capacitor, and a limiter-amplifier in series. The upper heaters are inclined downward, thereby enhancing heating efficiency. For 14 rate, the LDPC code has the following relevant parameters: q=135, nldpc=64,800, kldpc=nBCH=16200, kBCH=16008.