In a method for searching for signals among interference signals in a
multi-channel radio receiver, at least two different data signals are
transmitted on at least one physical channel of a radio system to a
common receiver. The search for a signal is initiated on any channel,
starting with a sequential search of a useful signal by measuring the
current signal strength in the form of the RSSI value; a search is made
for a signal criterion of the signal and when said criterion has been
identified, the measured RSSI value is compared with a predefined RSSI
threshold value; if the RSSI threshold value is exceeded, the search for
a signal is switched to a search for a data frame and if a data frame is
found, the useful data is read; if no signal criterion is identified, if
the RSSI threshold value is not exceeded and if no data frame is found,
the procedure is interrupted and a new search operation is initiated once
a new RSSI threshold value has been defined. The invention is
particularly suitable for radio transmission systems in motor vehicles to
implement RKE and TPMS functions and for multi-channel transmissions,
used for example in remote metering and remote control systems.