Patent ID: 7756225

Claim:
A device for preamble detection and particularly for synchronizing a receiver with a frame structure of a radio signal received from a transmitter, wherein data packets are transmitted by radio between the transmitter and the receiver and the device receives samples of the received radio signals and the data packets are in each case preceded by a known preamble, wherein the preamble has a sequence of identical first preamble sections and the first preamble sections in each case have a sequence of preamble symbols, the device comprising a first correlator unit for correlating samples with the preamble symbol sequence of the first preamble section, a first accumulator unit for accumulating values which are based on the first correlation results generated by the first correlator unit, and a first detector unit for detecting a received preamble by means of a first comparison of a first metric generated by the first accumulator unit with a first threshold value, wherein the device is constructed in such a manner that a preamble detection can be performed at two different speeds, wherein a slow preamble detection allows a more reliable preamble detection than a fast preamble detection, wherein the device is constructed for correlating only over the length of a first preamble section in the fast preamble detection and for correlating over a number of preamble sections in the slow preamble detection, wherein if, in the fast preamble detection, an output signal of the first accumulator unit exceeds a second threshold value the slow preamble detection is performed.