INMARSAT COMMUNICATIONS DOWN-LINK RECEIVER AND DATA RESTORATION METHOD USED IN THE SAME

摘要

An Inmarsat communications down-link receiver is disclosed.  The Inmarsat communications down-link receiver comprises: an analog to digital converter (ADC) that converts an analog received signal to digital and outputs a digital signal r(k); a first interpolater that receives the digital signal r(k) as input and restores the first data; a UW (unique word) detector that multiplies the conjugate complex numbers of r(k-1), which is to say r(k) delayed by 1 sample, and the digital signal r(k) to produce a differential signal, and that uses the correlation of the differential signal to determine whether it is a unique word; a second interpolater that receives the differential signal as input and restores second data; a time difference detector that detects time-related errors in the second data and outputs the time difference; and a controller that outputs a symbol restoration central constant and symbol restoration interval constant according to the time difference; [A1] and the symbol restoration central constant and symbol restoration interval constant are provided in the first and second interpolaters.  Within the communications environment that uses the Inmarsat Mini-m system, data symbols may be sampled with reliability from the received signals that are received.