Method for Searching for Signals Among Interference Signals in a Multi-Channel Radio Receiver
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Accused Products
Abstract
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.
65 Citations
16 Claims
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1-8. -8. (canceled)
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9. A method for searching for signals among interference signals in a multi-channel radio receiver in which at least two different data signals are transmitted on at least one physical channel of a radio system to a common receiver, the method which comprises:
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starting from a sequential search for a useful signal, initiating a signal search on any given channel by measuring a current signal strength to determine a measured RSSI value; searching for a signal criterion for the useful signal being sought and, when a signal criterion is identified, comparing the measured RSSI value with a predetermined RSSI threshold value; if the measured RSSI value exceeds the RSSI threshold value, switching from a signal search to a data frame search and, if the data frame search is successful, reading the useful data; and occasionally, if no signal criterion is identified, if the RSSI threshold value is not exceeded, or if no data frame is found, aborting the search, defining a new RSSI threshold value, and initiating a new search process. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification