Analysis of ICI compensation for DVB-T2

Abstract

This paper analyzes the impact of inter-carrier interference (ICI) compensation on the physical layer of DVB-T2, the new digital terrestrial television standard. We compare the performance of a well-known low complexity soft demapper for different time-interleaving depths and code rates in several realistic mobile scenarios. This paper further presents an iterative receiver design that exchanges extrinsic information between the low-density parity-check (LDPC) decoder and the ICI canceller in order to improve performance. Provided simulation results show that the proposed ICI cancellation algorithms can be necessary in several DVB-T2 transmission modes when the length of the time interleaver is limited.

Novel pilot structures for BEM channel estimation and ICI compensation in high-mobility DVB

“…This iterative soft demapper, shown in Fig. 2 and introduced in [8], uses the extrinsic likelihood values as a priori information (L A ) for the demapping process. Thus, it is no longer assumed that all states of the constellation are equiprobable.…”

“…Regarding ICI suppression, many research works have been published for DVB-T [4], [6], [7], and for DVB-T2 with perfect channel knowledge [8]. Nevertheless, their efficiency in realistic DVB-T2 reception including channel estimation remains an open issue.…”