Radar detection in a broadband radio communication system

A terminal for transmission of data in a broadband radio communication system, the terminal being arranged to inhibit the transmission of data dependent on detection of radar pulses, the radar pulses being transmitted with one or more pulse repetition intervals selected from a set of allowed pulse repetition intervals, the terminal comprising:

• a transmitter arranged to conduct transmission of data in a frequency channel;
• a receiver arranged to receive a signal waveform at the terminal;
• a detector arranged to detect a plurality of potential radar pulses in the received signal waveform;
• and
• a processor arranged to:
• ascertain a reception time for each of the plurality of potential radar pulses;
• select a pair of pulses from the plurality of potential radar pulses, the pair of pulses having respective reception times separated by a selected pulse repetition interval selected from the set of allowed pulse repetition intervals;
• select one or more further pulses, of the plurality of potential radar pulses, related to said selected pair by having a respective reception time separated from the respective reception time of at least one pulse of said pair of pulses by one or more pulse repetition intervals from the set of pulse repetition intervals;
• discount at least two other pulses from the plurality of potential radar pulses, the at least two other pulses having respective reception times separated by a pulse repetition interval in the set of allowed pulse repetition intervals, the at least two other pulses being discounted on the basis of not being related to said selected pair by having a respective reception time separated from the respective reception time of at least one pulse of said pair of pulses by one or more pulse repetition intervals from the set of pulse repetition intervals;
• and
• inhibit the transmission of data in said frequency channel at least in part in dependence on the selection of the further pulses related to said selected pair, and not in dependence on pulses not selected as the further pulses.

A non-transitory computer readable medium having instructions to cause a processor to cause a terminal to perform a method of transmission of data at a terminal of a broadband radio communication system, the terminal being arranged to inhibit the transmission of data dependent on detection of radar pulses, the radar pulses being transmitted with one or more pulse repetition intervals selected from a set of allowed pulse repetition intervals, the method comprising:

• conducting transmission of data in a frequency channel;
• receiving a signal waveform at the terminal;
• detecting a plurality of potential radar pulses in the received signal waveform;
• ascertaining a reception time for each of the plurality of potential radar pulses;
• selecting a pair of pulses from the plurality of potential radar pulses, the pair of pulses having respective reception times separated by a selected pulse repetition interval selected from the set of allowed pulse repetition intervals;
• selecting one or more further pulses, of the plurality of potential radar pulses, related to said selected pair by having a respective reception time separated from the respective reception time of at least one pulse of said pair of pulses by one or more pulse repetition intervals from the set of pulse repetition intervals;
• discounting at least two other pulses from the plurality of potential radar pulses, the at least two other pulses having respective reception times separated by a pulse repetition interval in the set of allowed pulse repetition intervals, the at least two other pulses being discounted on the basis of not being related to said selected pair by having a respective reception time separated from the respective reception time of at least one pulse of said pair of pulses by one or more pulse repetition intervals from the set of pulse repetition intervals;
• and
• inhibiting the transmission of data in said frequency channel at least in part in dependence on the selection of the further pulses related to said selected pair.