Being the method of playing back the time base point which is stipulated the method of playing back the time base point which is stipulated by the synchronization signal which includes the synchronous sequence which

摘要

In the radio system, as for the time base point, synchronous sequence s (i), i=0. As, N-1 receiver Y, is transmitted to 48 from sender X and 40, it is possible to decide the adjustable filter 44 in Y, h (i)=s (N-1-i) by checking output peak value. In the actually system, precision of this peak inspection on the radio channel is restricted by the radio interference and noise. In order to increase peak inspection precision, we propose that transmission of the identical synchronous sequence the K time it repeats. Repetition transmission interval L is fixed, as for amplitude of the synchronous sequence which each it repeats and in transmitting, specified fluctuation pattern a (jL), j=0. It changes, according to K-1. Receiver Y, as for 48, L and a (jL), j=0. K-1 is known. After comparing with threshold, adjustable filter 44 of receiver 48 may transmit the peak which is pulled up the peak which it occurs from the synchronous sequence which repeatedly is received, or, by the radio interference and/or noise.