Patent ID: 7286617

Claim:
A receiver for receiving a signal comprising a carrier modulated with a known training sequence comprising: a frequency offset estimation unit for receiving the signal and obtaining an estimate of a carrier frequency offset from an autocorrelation signal obtained by autocorrelation of the part of the received signal containing a known training sequence; a frequency offset compensation unit for compensating the received signal with the estimate of the frequency offset obtained from the frequency offset estimation unit to form a compensated received signal; a time reference determining unit for obtaining a timing reference for the received signal by cross-correlation of the compensated received signal with a known training sequence; and wherein the receiver is adapted to obtain a timing reference obtained from the received signal by autocorrelation of the received signal, compare the timing reference for the received signal obtained by cross-correlation of the compensated received signal with the known training sequence and the timing reference determined by autocorrelation of the received signal, output a reset signal if the two timing references differ by more than a threshold value, and otherwise output the timing reference for the received signal obtained by cross-correlation of the compensated received signal with the known training sequence.