In a correcting method, error bits of a data signal inputted via a radio
channel are corrected in a time division multiple access system. At least
one of a RSSI information and a phase error information is determined at
every symbols when the data signal is received. It is judged whether or
not the determined information falls within a range of a predetermined
value indicating deterioration of a line quality. One bit outside the
range is determined as an error bit. The error bit is reversed.
