Receiver that detects a synchronisation position by representing samples as either positive or negative constants

摘要

A receiver is operable to detect a synchronisation position for recovering data from a set of received signal samples. The receiver comprises a filter having an impulse response matched to a predetermined characteristic of the received signal operable and is operable to produce an output signal which is representative of the convolution of the impulse response and the received signal samples, a synchronisation detector operable to detect the synchronisation position from said filter output signal, and a data detector operable to detect and recover data from the set of received signal samples from the synchronisation position provided by said synchronisation detector. The synchronisation detector is operable to represent each of said received signal samples as a positive or negative constant in dependence upon the relative sign of the signal sample, and to represent the samples of said filter impulse response as a positive or negative constant in dependence upon the relative sign of said impulse response samples, and said filter is operable to convolve said impulse response with said received signal samples by logically combining the representation of said received signal samples and said impulse response to produce said output signal. The receiver is therefore provided with a facility for detecting a synchronisation position from an output of the filter matched to a characteristic of the received signal, the filter being implemented with substantially reduced complexity and providing a reduced computational difficulty to form the representation of the convolution.