Patent ID: 7139338
Filing Date: 2006-11-21
Classification: H04L

Abstract:
1. A receiver for detecting and recovering data from at least one set of received signal samples, said signal samples comprising a plurality of data bearing signal samples and a plurality of guard signal samples before or after the data bearing signal samples, said guard signal samples being formed by repeating a plurality of said data bearing signal samples, and said data is modulated onto said data bearing signal samples in the frequency domain and transformed to said data bearing signal samples into the time domain to form the data bearing signal samples of said set of received signal samples, said receiver comprising: a matched filter having an impulse response that is controllably adaptable; a controller configured to change the impulse response of said matched filter to correspond with the signal samples of the guard signal samples, said matched filter being configured to produce an output signal which is representative of a convolution of the guard signal samples of said set with said set of received signal samples; a synchronisation detector operable to estimate the location of a sync position, consequent upon a distribution of energy with respect to time of said matched filter output signal with respect to said received samples, said sync position providing a position of a window of said received signal samples from which said data may be recovered from said data bearing signal samples; and a forward fourier transformer operable to recover the data by performing a forward fourier transform on the signal samples within said window.