A device (10) for preamble detection and frame synchronization, wherein data packets are transmitted by radio between transmitter and receiver and the data packets are in each case preceded by a known preamble with a sequence of preamble sections (B), with a correlator unit (20) for correlating samples (rn) with a preamble section (B), an accumulator unit (23) for accumulating correlation results, and a detector unit (24) for detecting a received preamble by a comparison of the accumulation result with a threshold value.