Abstract: A method of detecting a predetermined complex data sequence in a received signal, representing for example a broadcast burst preamble in a wireless LAN transmission, involves (a) performing an auto-correlation on the data extracted from the received signal to provide an auto-correlation output, (b) combining the auto-correlation output with a delayed version of the auto-correlation output to produce a combined output and (c) providing a signal representing the predetermined data sequence if the combined output meets a predetermined condition, preferably also taking into account the phases of the auto-correlation output.

Abstract: In an OFDM receiver, a synchronisation pulse for defining a Fast Fourier Transform window is generated by examining the output of a correlator to find a sub-interval within which there is maximum correlation between samples of the symbol separated by the length of the useful part of the symbol. The synchronisation pulse is generated during this sub-interval (102). Adjustments to the timing of the synchronisation pulse are made only if the current error is significant and persistent. A signal representing the amount of adjustment is used to determine phase rotations applied to the output of the FFT circuit.

Abstract: A method of detecting a predetermined complex data sequence in a received signal, representing for example a broadcast burst preamble in a wireless LAN transmission, involves (a) performing an auto-correlation on the data extracted from the received signal to provide an auto-correlation output, (b) combining the auto-correlation output with a delayed version of the auto-correlation output to produce a combined output and (c) providing a signal representing the predetermined data sequence if the combined output meets a predetermined condition, preferably also taking into account the phases of the auto-correlation output.