Patent ID: 8531981

Claim:
Arrangement for determining a characteristic from an input signal, the input signal comprising the IF frequency f IF and a preamble signal being a sequence of M similar data symbols, the data symbols having a symbol period SP, M being an integer greater than or equal to 2, the arrangement comprising: an input terminal for receiving N subsequent samples of the input signal, the N subsequent samples representing a part of the input signal approximating the symbol period SP, a rotation unit for cyclically shifting the N subsequent samples to obtain N rotated symbols; a correlation unit for correlating the N rotated symbols with P correlation functions to generate a set of N×P correlation values, each correlation function having a different centre frequency and P being an integer greater than or equal to 2; and, a processing unit for selecting a maximum correlation value from the set of N×P correlation values and determining the characteristic, wherein the characteristic is at least one selected from a group comprising preamble detect, frequency offset and timing offset.