Direct Spectrum Division Transmission Adapter of Burst Signal for Satellite Communications

We have been studying spectrum division transmission techniques to better utilize the unused frequency resources scattered over the satellite transponder by attaching an adapter to the existing satellite modem. Past studies were focusing on spectrum division of contiguous signals between point to point communications. This paper newly focuses on the spectrum division of burst signals assuming a data gathering system from multi-points to a single point via satellite. In applying the direct spectrum division transmission to burst signals, the conventional phase synchronization technique cannot be applied as it is. To overcome this problem, this paper proposes the insertion of special phase synchronization signals in front of the burst preamble signals at Tx DSDT adapter. This proposal enables the receiver to estimate the spectrum phase at the cross point of spectrum division and to compensate for the spectrum phase difference between adjacent sub-spectra. This paper evaluates the fundamental BER performance and shows how the proposed technique works as expected.